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Home My WebLink About20194986.tiffUSE BY SPECIAL REVIEW (USR) APPLICATION DEPARTMENT OF PLANNING SERVICES * 1555 N. 17TH AVENUE * GREELEY, CO 80631 w+ w. eldgov.com * 970-400-6100 * FAX 970-304-6498 FOR PLANNING DEPARTMENT USE: AMOUNT $ APPLICATION RECEIVED BY DATE RECEIVED: CASE # ASSIGNED: PLANNER ASSIGNED: Parcel Number*: - 3 - - fib _0- A, q 3 Address of site: 2,-.151/3 fl ttt cal facts- rA 12 digit number on Tax I.D. information, obtainable at www.weldgov.com). 1 Legal Description:PT. p '�� Section:39 Tet�� h ip: � N Range: Zone District: Acreage: R O H Floedplain: V65 Geological Hazard: Vas Airport Overlay: Ya FEE OWNER(S) OF THE PROPERTY: Name: At -ir-t A Iai ti' es Company: ,irk Phone #: CRo f1.7 Email: narbegiSer-icifirtq k4h�1nt/4t'.c Street Address: -t cgs co 47-x` City/State/Zip Code: _ .--t^, Name:A-NAtift''74641-)8-frAer--- Company: m Jsc Phone #: 302 tzl y Email: at net brste ,4 e/,c" Street Address: Z,cyS eit2, 'ice City/State/Zip Code: c h-ren Co l ,, 6". Name: Company: Phone #: Email: Street Address: City/State/Zip Code: APPLICANT OR AUTHORIZED AGENT: (See below: Authorization must accompany all applications signed by Authorized Agents) Name: Company: Phone #: Street Address: Email: City/State/Zip Code: PROPOSED USE: ca cMoo e 1) C +/- 3 card r. CS 4:iviAc its Po 6 ill ar401 I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the best of my (our)knowledge. Signatures of all fee owners of property must sign this application. If an Authorized Agent signs, a letter of authorization from all fee owners must be included with the application. If a corporation is the fee owner, notarized evidence must be included indicating that the signatory has to legal a�ythorityf to sign for the corporation. ft. / retote ler 4i4z-Act i§nature: +Dner or Author, d Agent Date AkkitifIW A lircisti4142tfr,;-:c Print Name Ca Signature: Owner or Authorized Agent Anna c -Theo VabineitC÷ Print Name q'12/ 1 c1 Date Rev 4 016 I, (We}, avizaer2 !WA Lt... (Owner — please print) DEPARTMENT OF PLANNING AND BUILDING DEPARTMENT OF PUBLIC HEALTH AND ENVIRONNMENT 1555 NORTH 17TH AVENUE GREELEY, CO 80631 AUTHORIZATION FORM , give permission to Alkninti.,PDR6e-ic (Authorized Agent — please print) to apply for any Planning, Building or Septic permits on our behalf, for the property located at (address or parcel number) below: Legal Description: of Section , Township N, Range v Subdivision Name: Lot Block Property Owners Information: Address: Phone: E-mail: Authorized Agent Contact Information: Address: Phone: E -Mail: Correspondence to be sent to: Owner Authorized Agent Both / by Mail Email Additional Info: OwnerSignature: Owner Signature: Lac) risztA4,,Lit cat %--rn 44.441) t LiAv "1 nwcar" Date: Y.s2rf -ly tre-I 'I -I GROVES FARM, L.L.C. A COLORADO LIMITED LIABILITY COMPANY Letter of Authority To Whom It May Concern: Members: The Members of the Groves Farm, L.L. ., a Colorado Limited Liability Company are Sharon Kay Rhoades, Janice Ann Bailey and Marsha Mae Trowbridge. � Managers: ers:. The Managers are Marsha M. Trowbridge and Dale D. Trowbridge. Auth on : This letter serves as notification of the powers vested by the Members to the Managers of the Groves Farm, L.L.C., a Colorado Limited Liability Company. The powers vested to the Managers are described in Article XIII of the Operating Agreement as follows: ARTICLE XIII MANAGEMENT Section 13.1 Vesting oVestini of Powers. Except as otherwise provided in this Agreement, metn,agemertt of the Company's business andaffairs shall be vested in the Managers. The Managers shall have rights and powers necessary to manage the Company. Section 13.2 Powers of Naga ers. (a) Control of Business. The Managers shall have full and complete charge of all affairs of the Company, and the management and control of the business shall rest exclusively with the Managers, subject to the terms and conditions of this Agreement. (b) Banking,. Each Manager shall be expressly authorized on behalf of the Company to execute individually, checks, drafts, and other orders for the payment of Company funds. (c) Borrow Money, Each Manager shall have the power to borrow money for Company yypurposes and, security is required tl erefore, to mortgage, pledge, hypothecate, or subject:to � p� any security arrangement for all or any part of the assets of the Company, and the income therefrom, as security for payments of such borrowings; to obtain replacements of any security device; and to prepay, in whole or in part, refinance, increase, modify, consolidate, or extend any obligations, all of the foregoing on such terms and in such amounts as the Manager, in his or her sole discretion, deems to be in the best interest of the Company. The Company cannot pledge or mortgage the Company Property without the consent of all Members. (d) Insurance. nce. Each Manager shall have the power to acquire and enter into any contract of insurance that the Manager deems proper for the protection of the Company, the conservation of the assets of the Company, or for any other purpose or benefit to the Company. (e) Sue or Demand, Each Manager shall have the power to demand, sue for, collect, recover and receive all goods, claims, debts, monies, interest and demands whatsoever now due or that may hereinafter become due or belong to the Company, including the right to institute any action, suit or other legal proceeding with respect to any of the foregoing. (1) Settle Actions. Each Manager shall have the power to defend, settle, adjust, submit to arbitration, and compromise all actions, suits, claims, and demands whatsoever that now are or hereafter shall be pending between the Company and any other person, firm, association or corporation, in such manner and in all respects as the Manager shall deem appropriate. (g) Execution of Documents. Each Manager er shall have the power to execute and deliver on behalf of and in the name of the Company, contracts, deeds, deeds of trust, assignments, notes, leases, mortgages, bills of sale, and any and all other instruments and documents necessary, incidental, or 1 of 3 appropriate in connection with the conduct of the Company's business. No person or other entity dealing with the Company shall be required to inquire into the authority of the Manager to take any action or make any decisions. (h) Purchase Personal Property. Each Manager shall have the power to purchase personal property for use in connection with the Company's business. (1) Purchaser ale or Lease Pro er ; Each Manager shall have the power to purchase, take, receive, lease or otherwise acquire, own, hold, improve, use, sell and otherwise deed in and with real, or personal property, or an interest in it, wherever situated; (j) Deal With Property. Each Manager shall have the power to sell, convey, assign, encumber, mortgage, pledge, lease, exchange, transfer, and otherwise dispose of all or any part of its property and assets; (l) Deal withInterests in Other Companies. Each Manager shall have the power to purchase, take, receive, subscribe for or otherwise acquire, own, hold, vote, use, employ, sell, pledge, or otherwise dispose of, and otherwise use and deal in and with, shares or other interests in or obligations of other limited liability companies/ domestic or foreign corporations, associations, general or limited partnerships, or individuals or direct or indirect obligations of the United States or of any government, state, territory, governmental district, or municipality or of any instrumentality of any of them; (1) Lendityloney. Each Manager shall have the power to lend money for the Company's proper purposes, and receive security for such loans. (m) Conduct Business in any State. Each Manager shall have the power to conduct its business, carry on its operations, and have and exercise the powers wanted by this Article in any state, territory, district, or possession of the United States or in any foreign country; (n) Agents and Contractors. Each Manager shall have the power to appoint agents, employees and independent contractors of this Company and define their duties and fix their compensation. (o) Distribution of Funds. Each Manager shall have the power to care for and distribute to the Members by way of cash, income, return of capital, or other vise, all in accordance with the provisions of this Agreement, and perform all matters in furtherance of the objectives of the Company or this Agreement. (p) Tax. Elections. Each Manager shall have the power to make any and all elections for federal, state, and local tax purposes including, without limitation, any election permitted by applicable law: To adjust the basis of Company Property pursuant to Code Section 754, 734(b) and 743(b), or comparable provisions of state or local law, in connection with transfers of interests in the Company and Company distributions. (u) To extend the statute of limitations for assessment of tax deficiencies against the Members with respect to adjustments to the Company's federal, state or local tax returns; and �.0 To the extent provided in Code Section 6221 through 6231, to represent the Company and Members before taxing authorities or courts of competent jurisdiction in tax matters affecting the Company and Members and to file any tax returns and execute any agreements or other documents relating to or affecting such tax matters, including agreements or other documents that bind the Company and Members with respect to such tax matters or otherwise affect the rights of the Company and Members. Section 13.3 Limitations of n4 The Property may not be sold without the consent of the majority of the Members. However, if Dale Trowbridge and or Marsha Trowbridge are serving as the Manager, then the Property may not be sold without the consent of the majority of the Members which majority must include Marsha or her descendants' interest. However, if the Property is no longer being farmed by Dale and Marsha Trowbridge then the majority of tthe Members may cause the Property to be sold without the consent of Dale and or Marsha Trowbridge. Section 13.4 lieAy on Manager. Any Person dealing with the Company may rely (without duty of further inquiry) upon a certificate signed by any Manager as to: of (a) The identity of any Manager or Member; (b) The Persons who are authorized to execute and deliver any instrument or document of the Company; or (c) Any act or failure to act by the Company on any other matters whatsoever involving the Company or any Member. Section 13.5 Limitation on Liability. Each Manager shall manage and control the affairs of the Company in good faith to carry out the purposes of the Company for the benefit of all of the Members. The Manager shall not be liable to the Company or any Member because of any act or omission made in good faith in the absence of gross negligence or willful misconduct. Section 13.6 Time Devoted to Business. Each Manager shall devote such lime to the business of the Company as she in her discretion deems necessary to efficiently carry on the Company's business. The Managers shall at all times be free to engage generally in all aspects of the other businesses for her own account and to establish similar entities. Section 13.7 Transacting Business with manager and its Affiliates. The Company may transact business with the Manager or its affiliates and said transactions other than those specifically disclosed in this Agreement, may be effected only on terms at least as favorable as may be obtained in an arms -length transaction from unaffiliated persons and must be disclosed to all Members. Section 13.8 Indemnification. The Company shall indemnify a Manager and or a Member to the fullest extent permitted by Colorado law, including the reimbursement of costs and expenses incurred in defending against any claims or actions. Section 13.9 Successor Manager. In the event that neither Dale nor Marsha is living or if neither is able to serve as Manager due to incapacity or resignation, then the majority in interest of the Members shall elect a new Manager of the Company. In the event that Dale Trowbridge and Marsha Trowbridge dissolve their marriage, then Dale shall no longer serve as a Manager of this Company. EXECUTED by the parties hereto on February 25, 2004. MANAGERS: ataesoket,) N1� ha M. Trowbri Dale D. Trowbridge MEMBERS: Sharon Kay Rhoades are/Hieelestes) ce Ann Bailey ha Mae Trowbridge 3 of 3 USR Questionnaire Planning Questions: 1. Once the desired land is purchased from the current owners, I would like to use lots SE -1128, Lot C (directly to the West of sE-1128), and 6+/- acres directly to the North of Lot A, E-1128, and Lot C for outdoor storage (Boats, RVs, ATVs, Campers, Trailers etc.). My intent is to have up to 200 storage "spots" available, ranging from small sizes for ATVs, and small trailers up to full size RVs. 2. The proposal is consistent with Chapter 22. a. It will utilize land that will not be used as anything other than empty pasture; no negative affect on agriculture uses and meets all zoning requirements based on Chapter 22, Section 22-1-10. b. There is no longer any water resources, or mineral resources connected to the land. c. There will be natural barriers of trees and bushes to maintain a pleasant and natural appearance. d. It will not disturb any owner's daily lives because the adjoining land is CRP land. e. It does not interfere with any code violations 3. The proposal is consistent with Chapter 23, specifically Section 23-1-40. a. It will have very little impact on congestion on the roads. County Road 74 is a major artery, and sees consistent traffic already, so adding a small storage facility will not affect it greatly. On top of that, there are other facilities that are on dirt roads that require extra maintenance, mine will not. b. I will be keeping land from being sold to home builders with the potential to be turned back into agriculture if desired; my proposal is not a permanent change. c. I would be preserving Weld County and personal family history as I am the 4th generation on the land, so instead of it selling to another family, it would still be in the family. d. We will not be adding any additional road easements. a With the amount of people moving to our area, it would be a benefit to have a place to store all the extra "toys". 4. The land around the proposal site is all family owned farm land that is currently CRP. 5. Hours of operation will be 24 hour access with 2 part time employees. 6. There will be 2 part time employees that also live on the premises. 7. There will not be any shift work, as both the part time and full time employee will also be living on site. 8. The number of people who will use the site will vary on the amount of storage spaces we are able to rent out. My end goal will be 200 rental spaces of different sizes depending on the size of what is being stored, and the demand. 9. This is not a dairy, livestock confinement operation or kennel. 10. The type of lot surface material will be a road base/ gravel mix. The approximate amount of surface area in that material will be 8 acres if allowed. 11. There will not be any parking spaces besides the actual storage spots unless the county requires that I have them, then at that point I will make room to accommodate them. 12. The landscaping for the site will be windbrake style trees along the perimeter. 13. There will be a chain link/ security fence along the perimeter of the proposed storage site. There will also be a security/ code entry gate at the entrance. 14. We will make sure that all units that are stored on site meet the criteria for what is allowed to be stored on site. 15. The proposed reclamation for the storage site if it were to be terminated would be to recover as much road base/ gravel as possible, and then return land back to pasture, natural area. 16. The Eaton, Galeton, and Ault Fire Districts will provide fire protection to the site as they already cover the area. 17. The gravel/ road base will be added before we open. There will be a wind brake line of trees added to the site immediately after the purchase of the land. There will be a chain link fence added as we grow. There will be security cameras added before we open for business. Engineering Questions: 1. It is hard to estimate the amount of traffic in and out of the storage facility. It will vary based on the number of spots that are rented. There would be very few round trips in one day, however, because most people will use their RV/Boat etc. for more than one day. 2. The expected travel routes would be one of only two ways; coming from the East on CR 74 or coming from the West on CR 74. . I estimate that 85% or more of the traffic to the storage site will come from the West, as it is more populated with less places to store their "toys". That leaves an estimated 15% of traffic coming from the East. 4. I expect Friday afternoon/ night and Sunday afternoon/ night to be the busiest because common sense would say that most people will use what they are storing at the beginning of the weekend and bring it back at the end. I expect holiday weekends to be busier than a normal weekend as well. 5. Access for the proposed storage will be a shared access to the West of lot C that already exists. The plan when purchasing lot C from Groves Farm will be that they will retain approx. 50' along the border for access to Lot D. Environmental Health Questions: 1. I will have bottled water on site. 2. There will be a portable toilet on site consistent with the Dept. of Public Health and Environment's portable toilet policy. 3. The only storage I am proposing at the moment is outdoor boat, RV, car/ truck, trailer storage. 4. There will not be any stockpiled wastes, chemicals, and/ or petroleum stored on site. 5. There will not be any fuel storage on site. 6. There will not be any washing of vehicles or equipment on site. 7. There will be no floor drains. 8. There will be no air emissions. 9. There will be no composting or landfills on site. 10. There will be no dairies or feedlots on site. Building Questions: 1. Existing Buildings: a. Single Family Residence on Ag (My residence). 1080 sq. ft. b. Utility Building (Chicken Coop). 144 sq. ft c. Equipment Shed. 640 sq. ft. d. Shed -Cattle, (Barn). 1600 sq. ft. e. Out Building (Loafing Shed) 728 sq. ft. f. Equipment Building (shed). 2052 sq. ft. Proposed Buildings: a. No proposed buildings at this time. 2. The existing buildings will have no use or purpose for the proposed storage. 3. No proposed usage for the existing buildings, the home and existing outbuildings will be used privately by myself. Vicinity Map Requirements: 1. See Map Additional Notes: 1. There will be no need for building permits, as we are not wishing to add any permanent buildings to the site. 2. There will be solar powered lights for the entry gate, and occasional lights set up on the perimeter (not facing CR 74). There will also be a small, solar powered light to illuminate the 4'x4' sign at the entrance. Drait age Narrative A I) Job 42019-052 Nathan Trowbridge Located Within t ..,, e South Half (S 1/2) of the Southeast Quarter (SE 1) and the Southwest Quarter (SW 1) of Section 34, Township 7 North, Range 65 West of the 6th Principal Meridian, Cou :a ty e Weld, State of Colorado Nathan Trowbridge 21543 County Road 74 Eaton, CO 80615 May 13, 2019 Prepared by Dan Campbell EIT 74322 "I hereby attest that this drainage narrative for Nathan Trowbridge was prepared by me, or under my direct supervision, in accordance with the provisions of the Weld County Storm Drainage Design Criteria for the responsible parties thereof I understand that Weld County does not and shall not assume liability for drainage facilities designed by others." Mark A. Taylor Registered Professional Engineer State of Colorado No. 46065 p_44% o,. 4 Ira roma t a 4.4.42 v •fair = 13 I Shit °NAL O# 1rfrgtjt1rit# I Property Description: The project site includes Lot C and a part of Lot D, Recorded Exemption No. 0709-34-4 RE - 4777. The area of the project site is +1- 9.13 acres. The project site is located within the South Half (S '/2) of the Southeast Quarter (SE V) and the Southwest Quarter (SW 1/) of Section 34, Township 7North, Range 65 West of the P.M., County of Weld, State of Colorado. WCR 74 Borders the property to the South. WCR. 43 is approximately 0.43 miles West of the site. WCR 45 is approximately 0.51 miles East of the site. WCR 76 is approximately 0.96 miles North of the site. The site is located approximately 2.19 miles East of the Town of Eaton limits. No major open channels, lakes, streams, irrigation and/or other water resource facilities are located within or adjacent to the project site. Lone Tree Creek is located approximately 0.33 miles West of the site. There is a privately owned irrigation ditch that runs along the Western side of the site. The existing ground cover is native prairie grass. According to the United States Department of Agriculture's (USDA) WebSoil Survey, the site is made up of 100% Otero sandy loam (Map Unit Symbol 51). Otero sandy loam contains the following characteristics: Hydrologic soil group: Type A, Slope: I. to 3 percent, Depth to restrictive layer: more than 80 inches, Natural drainage class: well drained, Runoff class: very low, Depth to water table: more than 80 inches, Frequency of flooding: none, Frequency of ponding: none. The typical profile for Otero sandy loam is as follows: HI — 0 to 12 inches: sandy loam, H2 12 to 60 inches: fine sandy loam. A proposed amended Recorded Exemption will combine Lot C (RE -4777), Lot SE 1128, and a part of Lot D (RE -4777) into one lot. A 30 -FT joint access & utility easement will be located on the West portion of Lot D for the benefit of Lot C. Adjacent Property Owners: Adjacent to the North and to the East of the site is an agricultural property owned by Groves Farm LLC. Adjacent to the East and to the South of the site is an agricultural property owned by Nathan and Anna Trowbridge. To the Southeast of the site past WCR 74 is an agricultural property owned by Lone Pine Livestock Inc. To the South of the site past WCR 74 is a residential property owned by Richard and Dann Brown, Sharon Green, and Sharon Hooper. To the Southwest of the site past WCR 74 is an agricultural property owned by Scott and Nancy Vermilyea. To the West of the site past the access road is an agricultural property owned by Harper Feedlot LLC. The properties surrounding the site are a mix of agricultural and residential properties. Proposed Site Development: The applicant is proposing an outdoor storage facility for RVs, boats, farm equipment, etc. Currently the site is undeveloped. The proposed development of the property includes: a packed gravel all-weather surface for RV/boat storage that will be located on the part of Lot D portion of the site, a Water Quality Capture Volume (WQCV) pond that will be located on Lot C, Landscaping including trees for wind break/privacy, and a joint access road with a portion being 300 -FT of asphalt for vehicle tracking control (per Weld County Code) and the remainder being packed gravel. 2 Drainage Policy, Exception to Stormwater Detention: Weld County's Storm Drainage Criteria is provided in Article XII of Chapter 23 of the Weld County Code (Sec 23-12-30. — Drainage Policy). It adopts the most recent edition of the Urban Drainage and Flood Control District's Urban Storm Drainage Criteria Manual (Volumes 1-3), with amendments. Sec. 23-12-30. -- Drainage Policy. F. Exceptions. 1. Exceptions to stormwater detention shall not jeopardize the public health, safety, and welfare of public and private property. Exceptions shall be supported with an approved drainage narrative which must describe, at a minimum: • List which exception shown below is being requested for consideration. Where the water originates if it flows onto the property from an offsite source. Where it flows as it leaves the property. The direction of flow across the property. If there have been previous drainage problems with the property. a. No stormwater detention will be required for sites that meet any of the following conditions. Requirements of the Municipal Separate Storm Sewer System (MS4) areas remain applicable. 10) NON -URBANIZING areas where the total project stormwater runoff of less than, or equal to, 10 cubic feet per second (cfs) for the 1 -hour, 100 -year, storm event. The site is not located within the Weld County MS4 zone: all Requirements of the Municipal Separate Storm Sewer System (MS4) areas do not apply to the site (Please see attached map). The site is located approximately 2.19 miles East of the Town of Eaton limits (Please see attached map). Because the site is not located within a half mile radius of an Urbanized area, the site is classified as Non -Urbanized. The site is not affected by a floodplain per Weld County Online Mapping (please see attached map). The Rational Method was used to determine the stormwater runoff rate for the 100 -year, 1 -hour storm event. The Non -urbanized site will not require stormwater detention if the stormwater runoff is less than or equal to 10 CFS for the 100 -year, 1 -hour storm event. Q=CIA Q = the maximum rate of runoff (cfs) C = a runoff coefficient that is the ratio between the runoff volume from an area and the average rate of rainfall depth over a given duration for that area. I = average intensity of rainfall in inches per hour for a duration equal to the time of concentration, Tc A = area (acres) 3 C100= 0.35 (Type A soils at 25% imperviousness, 100 -year event — from Table RO-5 in Urban Storm Drainage Criteria Manual, Volume I, Revised April 2008) I s oo = 2.75 inlhr (1 hour, 100 -year storm event — Rainfall depths obtained from NOAA Atlas 14, Volume 8, Version 2 and converted to Intensity -Duration Curves using equation RA -3 found in Urban Drainage Criteria Manual, Volume 1, Revised April 2008) A = 9,13acres Qioo = (0.35) x (2.75 i ) x (9.13 acres) Qioo = 8.79 CFS, 8,79 CFS < 10,0 CFS, Therefore stormwater detention is not required The site meets the requirements for stormwater detention exception for Non -Urbanizing areas per Sec 23- I2.30►.F.1.a.10 found in Weld County's Storm Drainage Criteria, Article XII of Chapter 23 of the Weld County Code (Sec 23-12-30. — Drainage Policy). Water Quality Capture Volume(WQCV ) Pond: The stormwater runoff rate for the 100-yr, 1 -hr stoini event was calculated to be 8.79 CFS, which is less than the maximum allowed 10 CFS for detention pond exception in Non - Urbanizing areas. The site doesnot require a detention pond, however a WQCV pond will be used to treat and control the stormwater runoff. The required size of the WQCV pond, approximately 4,469 cubic feet, was determined by using the WQCV equation (equation 3-1) and Volume equation (equation 3-3) provided in Urban Storm Drainage Criteria Manual, Volume 3, updated November 2010. Please see attached spreadsheet, Onsite Stormwater Drainage Flow Patterns: The historic drainage patterns on the site will be maintained in such a manner that it will reasonably preserve the natural character of the area as much as possible, Drainage patterns on the site were determined from the Weld County Online mapping topography map. Stormwater runoff on the part of Lot D area flows in a West to Southwest direction at approximately 2% slopes. Stormwater runoff on Lot C flows in a West to Northwest direction at approximately 2% slopes. The WQCV pond will located on Lot C of the site where the stormwater runoff flows on the entire site converge (Please see attached drawing). Offsite Stormwater Drainage Flow Patterns: No offsite stormwater runoff enters the site from the West or the South. Offsite stormwater from the West flows away from the site, The barrow ditch along WCR 74 intercepts offsite stormwater flows from the South. Offsite stormwater runoff may enter the site from the properties adjacent to the North and East of the site. Looking at the topography map obtained from the Weld County Online Mapping website, stormwater runoff in the vicinity flows in an East to West direction at approximately 2% slopes. 4 Drainage Problems with the Property: No known previous drainage problems have occurred at the site. WQCV Pond Maintenance: In order for the WQCV pond to be effective, proper maintenance is essential. Maintenance considerations for the WQCV pond may include the following: • Use of mild side slopes (no steeper than 3(H);1(V) or 33%. The recommended side slopes of the WQV pond is 4(H):1(V) or 25%. Having mild side slopes allows for maintenance equipment to be used with ease in a safe and efficient manner. Permanent ponds should have provisions for sediment removal. The frequency of sediment removal will vary among facilities, depending on the rate of accumulation. The pond should be checked annually for sediment build up. • After large storm events, the pond should be inspected for erosion issues. If erosion is noticed, it should be repaired in a timely manner. All vegetation should be kept at less than one foot tail per Weld County Code. The pond should be mowed and maintained on a regular basis to ensure its optimal function. WELDCOUNTY ONLINE MAPPING 4,468,5 WGS_1984_Web_Mercator Auxiliary Sphere © Weld County Colorado 2,234.23 4,468.5 Feet This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or ma.. not be accurate, current, or otherwise reliable. THIS MAP IS NOT TO BE USED FOR NAVIGATION Legend 11 Parcels Highway Road Road Highway Township I Range Section Quarter Section County Boundary 0' VICINITY MAP 1 " = 2000' 200' 400' DRAINAGE EXHIBIT LOCATED IN THE SOUTH HALF (S 1/2) OF THE SOUTHEAST QUARTER (SE 1/4) AND THE SOUTHWEST QUARTER (SW 1/4) OF SECTION 34, TOWNSHIP 7 NORTH, RANGE 65 WEST OF THE 6TH PRINCIPAL MERIDIAN, COUNTY OF WELD, STATE OF COLORADO 600' i SCALE 1"=200' LEGEND SECTION LINE = PROPERTY BOUNDARY ROW = GRAVEL = ASPHALT = LANDSCAPING/GREENSPACE = EXISTING DRAINAGE FLOW PATTERN SOIL CLASSIFICATION MAP SYMBOL - SWALE FLOWLINE PROPOSED GRAVEL WQCV POND V=+4,469 FP SWITCHES FROM ASPHALT TO GRAVEL PROPOSED ASPHALT 300' LONG STARTING FROM W.C.R. 74 EDGE OF PAVEMENT 24' WIDE ACCESS ROAD 24.0' 30' JOINT ACCESS EASEMENT 30.0' AREA = 0.42 AC --\\- SECTION LINE PROPERTY BOUNDARY GATE tyre•+.._ . S WALE FLOWLINE IC?7 LOT C (RE -4777) AREA = f 2.27 AC EDGE OF PAVEMENT W.C.R. 74 SECTION LINE I 0 T PART OF LOT D (RE -4777) AREA=±6.44 AC iCP ti ,:,fti•.'Fo-.."-' �.-u : =I s %bra_. ".1ac J Li.2�Y:.•. ••, �,...t.e+..w:aj y-�s _ F-. ..�vn �r�. ..a.A....se�. darc'ri S'c^rv�sr�, PROPOSED LANDSCAPING 2O0' d SE 1128 (NOT A PART) SOUTH 1/4 CORNER OF SECTION 34 42 PROPOSED GRAVEL LOT A RE -4777 c (NOT A PART) -� �-- W.L.R. 74 (60' R.O.W.) NOTES: LOT C PROPERTY BOUNDARY AND THE SOUTHERN AND WESTERN PROPERTY BOUNDARY OF PART OF LOT D DETERMINED FROM RECORDED EXEMPTION NO. 0709-34-4 RE -4777. B THE NORTHERN AND EASTERN BOUNDARY OF PART OF LOT D DETERMINED FROM INFORMATION PROVIDED BY THE OWNER. DRAINAGE PATTERNS DETERMINED FROM WELD COUNTY ONLINE MAPPING TOPOGRAPHY MAP. AREA ALLOCATIONS TABLE TERRAIN SCE FT ACRES % AREA GREENSPACE/ LANDSCAPING 172,748 3197 43�48X GRAVEL 217,963 5,00 5477% PAVED 6,900 0,16 1175X TOTALS 397405 9.13 100,007: SOIL CLASSIFICATIONS FROM WEB SOIL SURVEY/NATIONAL COOPERATIVE SOIL SURVEY MAP SYMBOL % OF SITE SOIL NAME HYDROLOGIC SOIL GROUP 51 1OO.OO OTERO SANDY PERCENT LOAM, SLOPES 1 TO 3 A te SCALE: 1" = 200' SHEET 1 OF 1 DRAINAGE EXHIBIT NATHAN TROWBRIDGE 1/4 21543 COUNTY ROAD 74 EATON, CO 8O615 COUNTY OF WELD STATE OF COLORADO PART OF THE S 1/2 OF SEC. 34, T. 7 N. R. 65 11 REVISIONS Date: Description Appry DESIGNED BY: . DRAWN BY: DC CHECKED BY: MT • DATE 05/13/2019 1 PROJECT NO, 2019-052 %►. • • 460 • F' 1O. -Nits Lit t SITE IMPERVIOUSNESS = 25% STORMWATER RUNOFF FOR 1 —HR, 100—YR STORM EVENT = ± 8.79 CFS WQCV = ± 4,469 CF ALLES TAYLOR & DUKE, LLC 3610 35th Ave., Unit 6 Evans, Colorado 60620 (970) 330-03O8 ENGINEERING & LAND SURVEYING SERVICES Flrit WELD COUNTY thri, ()NH NI, MAFT1NCi 2,234,2 WGS_1984_Web_Mercator AuxiliaryySphere O Weld County Colorado 1,117.12 2,234.2 Feet This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear cm this map may or may not be accurate, current, or otherwise reliable, THIS MAP IS NOT TO BE USED FOR NAVIGATION r'r••jr r If - Ij Legend Parcels Address Label Highway O County Boundary Creek / Canal Large Scale annwil Perennial Intermittent Ephemeral Artificial Path Canal Ditch Coastline Connector Pipeline Underground Conduit River - Large Scale Area of Comprex Channels Area to be Submerged Baylnlet 11 Bridge CanalDitch DamWeir Flume Foreshore Hazard Zone Inundation Area Lock Chamber Hydrologic Soil Group —Weld County, Colorado, Southern Part MAP LEGEND MAP INFORMATION Area of Interest (AOI) IN Area of Interest (AOI) Soils Soil Rating Polygons A U AID B B/D G C/o D D Not rated or not available Soil Rating Lines A .rawr AID B BID C CID tedli D . Not rated or not available Soil Rating Points d' El 13 A AID B B/❑ a a a C The soil surveys that comprise your AO) were mapped at 1:24.000. CID D El Not rated or not available Water Features Streams and Canals Transportation [ t t Rails Interstate Highways US Routes Major Roads Local Roads Background ikkj Aerial Photography Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -MRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 17, Sep 10, 2018 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Oct 22, 2014 —Oct 2. 2017 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. usaet Natural Resources Web Soil Survey IMO Conservation Service National Cooperative Soil Survey 5/10/2019 Page 2 of 4 HydrologicSoil Group —Weld County, Colorado, Southern Part Hydrologic Soil Group Map unit symbol 1 Map unit name Otero sandy loam, 1 to 3 percent slopes Totals for Area of Interest Description Rating A Acres in Aol Percent of AOl 10.2 100.0% 10,2 Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (ND, BID, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission, Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. Theseconsist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (ND, BID, or CID), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition 100.0% USDA Natural Resources Web Soil Survey a Conservation Service National Cooperative Soil Survey 5/10/2019 Page 3 of 4 Hydrologic Soil Group Weld County, Colorado, Southern Part Aggregation is the process by which a set of component attribute values is reduced to a single value that represents the map unit as a whole. A map unit is typically composed of one or more "components". A component is either some type of soil or some nonsoil entity, e.g., rock outcrop. For the attribute being aggregated, the first step of the aggregation process is to derive one attribute value for each of a map unit's components. From this set of component attributes, the next step of the aggregation process derives a single value that represents the map unit as a whole. Once a single value for each map unit is derived, a thematic map for soil map units can be rendered. Aggregation must be done because, on any soil map, map units are delineated but components are not. For each of a map unit's components, a corresponding percent composition is recorded. A percent composition of 60 indicates that the corresponding component typically makes up approximately 60% of the map unit. Percent. composition is a critical factor in some, but not all, aggregation methods. The aggregation method "Dominant Condition" first groups like attribute values for the components in a map unit. For each group, percent composition is set to the sum of the percent composition of all components participating in that group. These groups now represent "conditions" rather than components. The attribute value associated with the group with the highest cumulative percent composition is returned. If more than one group shares the highest cumulative percent composition, the corresponding "tie -break" rule determines which value should be returned. The "tie -break" rule indicates whether the lower or higher group value should be returned in the case of a percent composition tie. The result returned by this aggregation method represents the dominant condition throughout the map unit only when no tie has occurred. Component Percent Cutoff' None Specified Components whose percent composition is below the cutoff value will not be considered. If no cutoff value is specified, all components in the database will be considered. The data for some contrasting soils of minor extent may not be in the database, and therefore are not considered. Tie -break Rule: Higher The tie -break rule indicates which value should be selected from a set of multiple candidate values, or which value should be selected in the event of a percent composition tie. USDA Natural Resources Web Soil Survey a Conservation Service National Cooperative Soil Survey 5/10/2019 Page 4 of 4 Hydrologic Soil Group and Surface Runoff --Weld County, Colorado, Southern Part Hydrologic Soil group and Surface Runoff This table gives estimates of various soil water features. The estimates are used in land use planning that involves engineering considerations. Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The four hydrologic soil groups are: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, BID, or C/D), the first letter is for drained areas and the second is for undrained areas. Surface runoff refers to the loss of water from an area by flow over the land surface. Surface runoff classes are based on slope, climate, and vegetative cover. The concept indicates relative runoff for very specific conditions. It is assumed that the surface of the soil is bare and that the retention of surface water resulting from irregularities in the ground surface is minimal. The classes are negligible, very low, low, medium, high, and very high. Report Hydrologic Soil Group and Surface Runoff Absence of an entry indicates that the data were not estimated. The dash indicates no documented presence. Hydrologic Soil Group and Surface Runoff —Weld County, Colorado, Southern Part Map symbol and soil name 51 —Otero sandy loam, 1 to 3 percent slopes Otero Pct. of map unit Surface Runoff Hydrologic Soil Group 85 Very low A USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 5/1012019 Page 1 of 2 Hydrologic Soil Group and Surface Runoff --Weld County, Colorado, Southern Part Data oar information Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 17, Sep 10, 2018 USDA Natural Resources Web Soil Survey oliSi Conservation Service National Cooperative Soil Survey 5/10/2019 Page 2 of 2 Map Unit Description: Otero sandy loam, 1 to 3 percent slopes ---Weld County, Colorado, Southern Part Weld County, Colorado, Southern Part 51 -Otero sandy loam, I to 3 percent slopes Map Unit Setting National map unit symbol: 3630 Elevation. 4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature: 48 to 52 degrees F Frost -free period: 130 to 180 days Farmland classification: Prime farmland if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Otero Setting Landform: Plains Down -slope shape: Linear Across -slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Typical profile H1 - 0 to 12 inches: sandy loam H2 - 12 to 60 inches: fine sandy loam Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches Natural drainage class: Well drained Runoff class: Very low Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 inlhr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum in profile: 10 percent Salinity, maximum in profile: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm) Available water storage in profile: Moderate (about 7.7 inches) Interpretive groups Land capability classification (irrigated): 3e Land capability classification (nonirrigated): 4e Hydrologic Soil Group: A Ecological site: Sandy Plains (R067BY024CO) Hydric soil rating: No US DA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 5/10/2019 Page 1 of 2 Map Unit Description: Otero sandy loam, 1 to 3 percent slopes —Weld County, Colorado, Southern Part Minor Components Kim Percent of map unit: 10 percent Hydric soil rating: No Vona Percent of map unit: 5 percent Hydric soil rating: No Data Source Information Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 17, Sep 10, 2018 USDA Natural Resources a Conservation Service Web Soil Survey National Cooperative Soil Survey 5/10/2019 Page 2 of 2 FIPP. WELD COUNTY )NI !NT IA p1.NL GROVES '2118.46IS 279.3 139.64 219.3 Feet Calculated Acres 1 68 tif9.6 G I T III era l ate4 Acres WGS_198,4_Web_Mercator Auxiliary_ Sphere U Weld County Colorado This map is a user generated static output from an Internet mapping site and is for reference only. Data la:,Drs that appear on this map may or may not be accurate, current, or otherwise reliable THIS MAP IS NOT TO SE USED FOR NAVIGATION Legend Parcels -- Highway O County Boundary Notes 1" Atte, t j:Agf. O Sec. 23-12-30. - Drainage policy. A. The Policy of Weld County shall be to pursue a jurisdictionally unified drainage effort to assure an integrated drainage system and to cooperate with other regional and local planning agencies on drainage matters. B. For new development, the Policy of Weld County is to prohibit un- detained discharges to roadside ditches located in the County right- of-way unless granted by a variance. Except as set forth below, the Policy of Weld County shall be to require regional and/or on -site detention for all future developments. Temporary or interim detention/retention may be required if the downstream regional facilities have not yet been constructed per the applicable master plan for that location. Stormwater retention facilities are normally not allowed in Weld County, but will be considered for special circumstances. D. The Policy of Weld County is to require detention of runoff from the 1 -hour, 100 -year, storm falling on the developed site and release of the detained water at the historic runoff rate of the 1 -hour, 5 -year storm falling on the undeveloped site for URBANIZING areas and the historic runoff rate of the 1 -hour, 10 -year storm falling on the undeveloped site for NON -URBANIZING areas. Historic is defined as an undeveloped site with a 2.0% imperviousness. If the urbanizing jurisdiction has adopted a different historic runoff rate than that stated in this subsection, then the urbanizing jurisdiction runoff rate shall apply. E. Weld County will not accept any detention or retention pond that does not drain in less than 72 hours, causes injury to water rights, or is in violation of state or federal law. Upon evaluation, improvements may be necessary to downstream capacity. F. Exceptions, 1. Exceptions to stormwater detention shall not jeopardize the public health, safety, and welfare of public and private property. Exceptions shall be supported with an approved drainage narrative which must describe, at a minimum: • List which exception shown below is being requested for consideration. • Where the water originates if it flows onto the property from an offsite source. • Where it flows as it leaves the property. • The direction of flow across the property. • If there have been previous drainage problems with the property. Exceptions to the stormwater detention shall be limited to the following: No stormwater detention will be required for sites that meet any of the following conditions. Requirements of the Municipal Separate Storm Sewer System (MS4) areas remain applicable. 1) Use by Right or Accessory Use in the A (Agricultural) Zone District. 2) Zoning Permits in the A (Agricultural) Zone District. 3) A second dwelling permit in the A (Agricultural) Zone District. 4) Towers including, but not limited to, cell, wind, and telecommunication towers. 5) Pipelines or transmission lines. 6) Gravel pits if the stormwater drains into the gravel pit. 7) Residential developments where all the following conditions exist: a) Nine (9) lots or fewer. b) The average lot size is equal to, or greater than, three (3) acres per lot. Downstream roadway criteria are not exceeded. d) The total post -development imperviousness for the rural residential development does not exceed ten percent (10°/Q), assuming that all internal roads and driveways are paved, or will eventually be paved. 8) Development of sites where the change of use does not increase the imperviousness of the site. 9) URBANIZING areas where the total project stormwater runoff of less than, or equal to, 5 cubic feet per second (cfs) for the 1 -hour, 100 -year, storm event. 1 0} NON -URBANIZING areas where the total project stormwater runoff of less than, or equal to, 10 cfs for the 1 -hour, 100 -year, storm event. 11) Parcels with total area less than, or equal to, a 1.0 gross acre. 12) Individual parcel with an unobstructed flow path and no other parcel(s) between the Federal Emergency Management Administration (FEMA) regulatory floodplain channel and the project. 13) A parcel greater than 1 gross acre and Tess than, or equal to, 5 gross acres in size is allowed a onetime exception for a new 1,000 sq. ft. building or equivalent imperviousness. 14) A parcel greater than 5 gross acres in size is allowed a onetime exception for a new 2,000 sq. ft. building or equivalent imperviousness. 15} Concentrated Animal Feeding Operation (CAFO), Animal Feeding Operations (AFO) and Housed Commercial Swine Feeding Operation (HCSFO) which are covered and approved by the Colorado Discharge Permit System (CDPS) regulations. Portions of the site not included or covered by the CDPS permit, shall comply with the Weld County Drainage Code requirements. 16) Approved by a variance. ( Weld County Code Ordinance 2015-11 ; Weld County Code Ordinance 2016-5) rWELDCOUNTY r Y p� `1I.Ir 1��t,A1FINC 8,936.9 4,468.46 8,936.9 Feet s itor ditte WGS_1984 Web,Mereator_Auxiliary_Sphere Q Weld County Colorado IS sf _ al I lir __St ! 44 slij :Ilt,AlAirtille Sta." fa . All s �. w-�►-�s-� 11141-'T !ii * 110-111- 4. 4 ,1 A VI t Illi4 A M : o t i i rr i $ • dal, tras ea seitaiwiravo iaIPS-it4sib- ap: a U 11 %4aP*wt. deOro tae s p*- xi. la lillt 0 a • S It 04 is 4 * 0 0 a ii di a et It4 I This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or may not be accurate, current, or otherwise reliable. THIS MAP IS NOT TO BE USED FOR NAVIGATION 1 ' bid" — rest T'11,",1er Legend Parcels Weld County MS4 Weld County Maintained Road Paved Road Gravel Road Jointly Maintained Roads Highway Road Road Highway Lc County Boundary Notes stoi zo WELD COUNTY kr ()NI 1 ]..N. .. A1 PIN — Total: 2.19 mi 8,936.9 4,46846 WGS_1984_Web_Mercator_ Auxiliaryr_Sphere c Weld County Colorado - 8,936.9 Feet This map is a user generated static output from an Internet mapping site and is for reference only, Data layers that appear on this map may or may not be accurate, current, or otherwise reliable THIS MAP IS NOT TO BE USED FOR NAVIGATION r 1•;�tal�l�j Litinver Legend Parcels Highway Road Road — Highway Li County Boundary Mr to i WELD COUNTY (.) l_lNE MAPPING 4,468.5 WGS_1984_Web_Mercatar_AuxiliarySphere Q Weld County Colorado 0 2,234.23 4,468.5 Feet This map is a user generated static output from an Internet mapping site and is for reference only Data layers that appear on this map may or ma; not be accurate, current, or otherwise reliable. THIS MAP IS NOT TO BE USED FOR NAVIGATION -I ;Ate Legend S Parce#s Floodplain - 500 Floodplain - 100 Floodplain - 100 Floodplain - 100 Floodplain 100 Floodplain - 10O Highway Road Road Highway Year Year Zone A Year Fioodwa Year Zone AE Year Zone N- Year Zone AC County Boundary The Rational Method Q = CIA Equation (RD -1) Q = the maximum rate of runoff (cfs) C = a runoff coefficient that is the ratio between the runoff volume from an area and the average rate of rainfall depth over a given duration for that area I = average intensity of rainfall in inches per hour for a duration equal to the time of concentration, to A = area (acres) 0100 = 0.35 (Type A► soils at 25% imperviousness, 100-yr event - from Table RO-5 in Urban Storm Drainage Criteria Manual, Vol. 1, Revised Aprl 2008 Imo = 2.75 inlhr (1 -hr, 100-yr storm event - Rainfall depths obtained from NOAA Atlas 14, Vol. 8, Version 2 and converted to Intensity -Duration curves using equation RA► -3 found in Urban Drainage Criteria Manual, Vol. 1, Revised April 2008 A = 9.13 acres Q = (0.35) x (2.75 inlhr) x (0.13 acres) Q = 8.79 cfs PERCENT IMPERVIOUS DEVELOPED Site Area = Proposed Site Conditions Paved Gravel Roofs/Concrete Greenspace 397605 6900 217963 0 172742 ft2 ft2 ft2 ft2 ft2 Percent imperviousness Developed (Calculated) 9.13 .2 0. Percent imperviousness from Table RO-3 AC _i Paved Gravel Roofs/Concrete Greenspace C100 = runoff coefficient for 100 -year frequency (from Table RO-5) (*Note Soil Type)l 0.35 1.00 0.40 0.90 0.02 Soil Type DRAINAGE CRITERIA MANUAL (V. 1) RUNOFF Table RO-3-- Recommended Percentage Imperviousness Values Land Use or Surface Characteristics Percentage Imperviousness Business: Commercial areas 95 Neighborhood areas 85 Residential: Single-family Multi -unit (detached) 60 Multi -unit (attached) 75 Half -acre lot or larger Apartments 80 Industrial: Light areas Heavy areas 80 90 Parks, cemeteries 5 Playgrounds 10 Schools 50 Railroad yard areas 15 Undeveloped Areas: Historic flow analysis 2 Greenbelts, agricultural 2 Ofd (when site flow land analysis use not defined) 45 Streets: Paved 100 Gravel (packed) 40 Drive and walks 90 Roofs 90 Lawns, sandy soil _ B 0 Lawns, clayey soil p * See Figures RO-3 through RO-5 for percentage imperviousness. + 1.31i 3 —1.44i2 + 1.135i — 0.1 for CA ≥ 0, otherwise C4 RO _ -8 C ) + @4858i3 - 0.786i2 + 0.7741+ 0.04)(RO-7 ) GB =(CA +c )l2 2007-01 Urban Drainage and Flood Control District RO-9 RUNOFF DRAINAGE CRITERIA MANUAL (V. 1) TABLE RO-5 (Continued) ---Runoff Coefficients,, Percentage u 1r� e 10u r c Type A NRCS Hydrologic Oils Group 2- r 5-yr 10-yr 25-yr 50-yr 1 100-yr 0% 0.00 0.00 0.05 0.12 0.16 0.20 1 5% 0.00 0.02 0.10 016 0.20 0.24 10% 0 f 00 0.06 0.14 0.20 0.24 0.28 _.n 15% 0.02 0.10 0.17 0►.2 20% 0.06 0.130.26 0.30 26% 0.09 0.16 0.23 0.29 i 0.35 30% M _fl0.19r 0.31 I A 35° 0.16 0.22 0.28 0.33 0.36 0.39 40% I 0.30 I. 0.35 0.38 0. 1 45%0.22 0.37 0.40 0.4 50% Y 25 0.40 55% 0.29 0.330. 0.42 0.45 0.47 60% 0.33 0.37 0.41 0,45 0.47 0.50 65% 0.37 OA10.45 0.49 0.51 0.5.E 70% 0.42 0.45 0.49 0.53 0.54 0.56 75%1 0.47 0 0.54 0.57 0.57 0.59 O.59 _ 0. 61 80% 0,54 5.560.00 0.63 0.04 0.6.6 85% 0.61 0.63 0.66 0.69 010 0.72 90% 0.69 0.71 0.73 0.76 0.77 95% 0.78 0.80 0.82 0.84 0.85 0.36 100% 0.89 0.00 0.92 0.94 0.95 0.96 RC 12 2007-01 Urban Drainage and Flood Control District tirf W L.10 I ;, r 1 c\.fpika 1 ! 1 VIA Wn1 44y Liota %Jou you NOAA Atlas 14, Volume 8, Version 2 Location name: Eaton, Colorado, LISA* Latitude: 40.5233°, Longitude: -104.6486° Elevation: 4808.23 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica, Deborah Martin, Sandra Paviovic, Mani Roy, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Michael Yenta, Geoffery Bonnin NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphic F Maps_&_aerials PF tabular LPD -based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years) Duration � 2 10 � 25 L59._1L200II50011c90 _T 5 -min 0,242 (0.197-0.297) 0.293 (0.239-0.360) 0.389 (0.316-0.480) 0.481 (0.388-0.597) 0.626 (0.492-0.827) 0.753 (0.571-1.00) 0.892 (0.648-1.22) 1.05 (0.721-1.47) 1.27 (0.834-1.83) 1.45 (0.919-2.10) 10 -min 0.354 (0.289-0.435) 1 0.429 (0.350-0.528) 4.570 (4.463-0.703) 0.705 (0.568-0.874) 0.917 (0.721-1.21) 1.10 (0.836-1.47) 1.31 (0.94$_ 1.78) 1.53 (1.06-2.15) 1.86 (1.22-2.67) 213 (1.35-3.07) J 15 -min 0.432 (0.353-0.531) 0.523 (0.426-0.643) 0,695 (0.564-0.857) 0.859 (06693-1.07) 1.12 (0.879-1.48) 1.34 (1.02-1.79) 1.59 (1.16-2.17) 1.87 ('1.29-2.6x2) (1.49-3.26) 2.27 2.59 (1.64-3.75) 1 30 -min D 0.585 • (0.478-0.720) 0.707 (0.576-0.870) I 0.938 (0.761-1.16) 1.16 (0.935-1.44) 1.51 (1.19-2.00) 1.82 (1.38-2A2) 2.16 (1.57-2.94) ll 2.53 (1.75-3.55) 3.08 (2.02-4.43) 3.53 (2.23-510) -min 0.727 ^(0.593-0.893) 0.870 (0.709-1.07) 1.15 (0.935-1.42) 1.43 (1.15-1.77) 1.88 (1.48-2.49) 2.27 [11.73-3.04 ) I 2.72 1.98-3.72 ( ) 3.21 (2.22-4.51) 3.94 (2.59-5.68) 4.54 (2.87-6.56) 2 -hr 4,868 (0.713-1,06) 1.03 (0.848-1.26) 1.36 (1.12-1.67) 1.70 138-2.09 ( ) 2.24 (1.79-2.96) 2.73 (2.1(3-3.63) 3.28 (2.41-4.45) 3,89 (2.72-5.43) 4.80 , (3.19-6.87) 5.55 (3.55-7.95) 3 -hr 0.947 (0.7811.15) 1.12 (0.9221.36) 1.47 (1.21-1.79) 1.83 (1.49-2.24) 2.43 (1.95-3.20) 2.96 (2.29-3.92) 3.57 (2.64-4.84) 4.25 (2.99-5.91) 5.27 (3.53-7.51) 6.11 (3.93-8.71) 6 -hr 1 1.07 (0.892-1.29) 1.29 1.71 (1..41-2,07) 2.12 (1.74-2.57) 2.77 (2.23-3.60) 3.35 (2.60-4.37) 3.99 (2.97-5.33) . 4.70 (3.33-6.45) 5.74 (3.88-8.09) 6.61 (4.29-9.33) 12 -hr 1.26 (1.05-1.50) 1.51 (1.26-1.80) 1.97 (1.64-2.37) 2.41 (1.99-2.90) 3.08 (2.49-3.94) 3.67 (2.86-4.72) 4.30 (3.22-5.67) 4.99 (3.56-6.76) 5.99 (4.08-8.34) 6.81 (4.47-9.53) 24 -hr 1.50 [j.26 -1.78)J 1.76 (1.48-2.09) 2.23 (1.87-2.66) 2.68 (2.23-3.20) 3.37 (2.74-4.25) 3.96 (3.12-5.05) 4.61 (3.48-6.02) 5.32 (3.83-7.13) 6,34 (4.36-8.73) 7.17 (4.76-9.94) 2 -day 1.73 (1.47-2.03) 2.03 (1.72-2.38) 2.55 (2.15-3.01) 3.03 (2.54-3.59) 3.74 (3.05-4.65) 4.34 (144-5.46) 4.98 (3.79-6.42) 5.68 (4.12-7.52) ' 6.66 (4.62-9.06) 7.45 (5.00-10.2) 3 -day 1.90 (1.62-2.22) 2.19 (1.87-2.57) 2.72 (2.31-3.19) 3.20 (2.70-3,77) 3.92 (3.21-4.85) 4.53 (3.60.5.66) 5.18 (3.96-6.63) 5.88 (4.29-7.74) 6.87 [(4.80-9.30) 7.67 (5.18-10.5) 4 -day 2.02 (1.73-2.36) 2.33 j (1.99-2.72) 2.87 (2.44-3.36) 3.36 (2.84-3.95) 4.09 (3.36-5.03) 4.70 (3.75-5.85) 5.35 (4.11-6.83) 6.05 (4,43-7.93) 7.04 (4.94-9.49) 7.84 (5.32-10.7) • ?-day 2.29 (1.97-2.65) I 2.67 (2.29-3.09) 3.31 (2.84-3.85) £ 3.87 (3.29.4.51) 4.65 (3.82-5.63) 5.28 (4.22-6.48) 5.92 (4.56-7.45) 6.60 (4.85-8.53) 7.51 .(5.34-10.00 ) 8.23 (5.63-11.1) 10 -day . 2.52 (2.18-2.91) 2.96 (2.55-3.42) 3.68 (3.16-4.26) 4.28 (3.66-4.97) 5.11 (4.206.13 ) 5.75 (4.61-7.00) 6.40 (4.94-7.98 ) 7.05 (5.20-9.05) 7.92 (5.60-10.5) 8.58 (5.90-11.5) 20 -day 3.24 (2.82-3.71) 3.76 (3.26-4.30) 4.59 (3.97-5.26) 5/6 (4.53-6.06) 6.17 (5.10-7.30) 6.85 (5.53-8.23) 7.52 (5.86-9.27) 819 (6.09-10.4) 9.05 (6.46-11.8) 9.68 (6.74-12.9) 30 -day 3.83 (3.34-4.35) 4.40 (3.84-5.01) 5.31 (4.61-6.06) 6.05 (5.22-6.93) 7.03 (5.83-8.26) 7.76 (6.29-9.26) 8.47 (6.62-10.4) 9.17 (6.86-11.5) 10.1 (7.22-13.0) 10.7 (7.50-14.2) 45-da y 4.53 (3.97-5.12) 5.19 (4.55-5.88) 6.24 (5.45-7.08) 7.08 (6.14-8.07) 8.18 (6.81-9.54) 8.99 (7.32-10.7) 9.76 (7.67-11.9) 10.5 (7.91-13.1) 11.4 ' (8.27-14.7) 12.1 (8.54-15.9) 60 -day 5.09 (4.48-5.74) 5.86 (5.15-6.61) 7.06 (6.18-7.98) 8.00 (6.97-9.09) 9.23 i J(7.71-10.7) 10.1 (8.27-11.9) 11,0 (8.64-13.2) 11.7 (8.87-14.6) 12.7 (9.22-16.3) 13.4 (9.49-17.5) 1 Precipitation frequency (PF) estimates in this Numbers in parenthesis are PF estimates at lower estimates (for a given duration and average recurrence upper bounds are not checked against probable Please refer to NOAA Atlas 14 document for more table maximum are based and upper interval) information. on frequency analysis of partial duration series (PUS). bounds of the 90% confidence interval. The probability that precipitation frequency will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at precipitation (PMP) estimates and may be higher than currently valid PMP values. Back to Top https://hdsc.nws.noaa.gov/hdscfpfds/pfds_printpage.html?lat=40.5233&ion= 104.648fi&data=depth&units-english&series=pds 1/4 010/LU ItI rareci uaruon rreguency uata server PF graphical Precipitation depth (in) 14 12 10 8 6 4 PDS-based depth -duration -frequency (DDF) curves Latitude: 40.5233°, Longitude: 404.6486° 0 5 10 NOAA Atlas 14, Volume 8, Version 2 C L r4 A L nJ ri Duration L. 4 4j (13 tO V Li t 03 *O •> >1 +�> h.J a et 1 I I I NI en css 25 50 100 200 500► 1000 Average recurrence Interva6 (years) Created (GMT): Wed May 8 20:34:35 2019 Back to Top Maps & aerials Small scale terrain At crai a recurrence irtemal years) 2 5 to 50 10O 200 500 1000 J r Duraiort 5 -min O-tritn 4.5-rra n 30-rrun 60-frun 3411 54ir 12 -hr 24 -hr • ≥-day y -ayt 4 -day 7 -day, a. 10 -day 20 -day 3O -say 45 -day 60 -day https:flhlsc.nws.noaa.govlhriscipfdslpfds_printpage.hfirnl' lat=40.6233&Ion=-1 }4.6486&data=depth&units=english&series=pds 2/4 b/wwJu 123 rrecipnatlon rrequency uaia t>erver iy • ' Eaton 1 0%0 I I J • YV J• a. • t f tor Vre .:i Y ,, 'p r. 1• Lift ' se I • 4' f ..t 10. 3km 2mi I Large scale terrain la i • eyenne WEI . • Longmont 100km 60mi Denver Large scale map Fort Colliri Cheyenne r ey L g mont Boulder . bertwer c LIOOkm TI r l L Large scale aerial • t C C a https:l/hdsc.nwsbnoaa.govihdsclpfds/pfdtprintpage.html?lat=4( .52338IQn=-1 Q4,6486&data=depth&units=english&series=pds 3/4 b/a/2U19 rsrecipitation rrequency Lima server Back to Top US Department of Commerce National Oceanic .94 Atmospheric Administration National Weather Service Natigna l Water enter 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC,Questions@noaa.gov Disclaimer https:/lhdse.nws.noaa.gov/hdscfpfds/pfds_printpage.html?lat=40.5 .338clon=-104.6486&data=depth&units=english&series=pds 4/4 Intensity -Duration Curves for Rational Method From NOAA Atlas 14 1 -HOUR POINT RAINFALL DEPTHS 2 -YEAR 0.870 5 -YEAR 1.150 10 -YEAR 1.430 25 -YEAR 1.880 50 -YEAR 2.270 100 -YEAR & 2.720 L Input Fields Equation 5-1 I = 28.5 Pi (10+T )o.so I = rainfall intensity (inches per hour) P1 = 1 -hour point rainfall depth (inches) Td = storm duration (minutes) Time (minutes) 4 Intensity -Duration (Inches per hour) 2 -year 5 -year 10 -year 25 -year 50 -year 1 100 -year 5 2.95 3.90 r 4.85 6.38 7.70 9.23 10 2,35 3.11 3.87 5.09 6.14 7.36 15 1.98 2.61 3.25 4,27 5.15 6.17 20 1.71 2.26 2.81 3.70 4.47 5.35 25 1.52 2.00 2.49 3.28 3.96 4.74 30 1.37 1.80 2.24 2.95 3.56 4.27 35 1.24 1.64 2.05 2.69 3.25 3.89 40 _ 1.15 _ 1.51 1.88 2.48 2.99 3.58 45 1.06 1.40 1.75 t 2.30 2.77 3.32 50 0.99 1.31 1.63 2.14 2.59 3.10 55 0.93 1.23 1.53 2.01 2.43 2.9i 60 0.88 1.16 1.45 1.90 2.29 "2.75 65 0.83 4 1.10 1.37 1,84) 2.17 2.60 70 0.79 1.05 1.30 1.71 4 2,07 2.48 76 015 1.00 1.24 1.63 1.97 2.36 80 0.72 0.95 1.19 1.56 1.88 2.26 85 0.69 0.91 1.14 1.49 1.80 2.16 90 0.66 0.88 1.09 1.44 1.73 2.08 95 0.64 0.85 1.05 1.38 1.67 2.00 100 0.62 0.81 1.01 1.33 1.61 1.93 105 0.60 0.79 0.98 1.29 1.55 1.86 110 0.58 0.76 0.95 1.24 1.50 1.80 115 0.56 0.74 0.92 1.20 1.45 1/4 120 0.54 0.71 0.89 1.17 1.41 1.69 125 0.52 0.69 0.86 1.13 1.37 1.64 130 0.51 0.67 0.84 1.10 1,33 1.59 135 0.50 0.66 0.82 1.07 1.29 1.55 140 0.48 0.64 0.79 1.04 1,26 1.51 145 0.47 0,62 k 0,77 1.02 1.23 1.47 150 1 0A6 0.61 0.75 0.99 I 1.20 1.44 155 0.45 0.59 0,74 0.97 1.17 1.40 160 0.44 0.58 0.72 0.95 1.14 1.37 165 0.43 0.57 0.70 0.92 1.12 1.34 170 0.42 0.55 0.69 0.90 1.09 1.31 175 0.41 0.54 0.67 0.89 1.07 1.28 _180 0.40 0.53 0,66 0.87 1.05 1.25 Intensity -Duration Curves for Rational Method 10.00 9 00 E 00 1.00 -C 6 00 0 c 5 00 lu 4 40 3.00 2.00 1.00 003 0 —4-- 2 -year ---i --- 5 rear 30 :ear 25 -year —S -5O -yet- —4-100-year • ito 2D 40 60 80 100 120 Storm Durat on (minutes) 140 160 180 200 RAINFALL DRAINAGE CRITERIA MANUAL (V. 1) 4.0 INTENSITY -DURATION CURVES FOR RATIONAL METHOD To develop depth -duration cures or intensity -duration curves for the Rational Method of runoff analysis take the 1 -hour depth(s) obtained from Figures RA -1 through RA -6 and multiply by the factors in Table RA -4 to determine rainfall depth and rainfall intensity at each duration. The intensity can then be plotted as illustrated in Figure RA -15. TABLE RA -4 —Factors for Preparation of Intensity -Duration Curves Duration (minutes) 5 10 15 30 60 Rainfall Depth at Duration (inches) 6.29Pi 0.45P1 0.57P1 0.79Pi 1.O& Intensity (inches per hour) 3.48P, 2.70P1 2.28P1 1.58P? 1.0P1 Alternatively, the rainfall intensity for the area within the District can be approximated by the equation: 28.5 PI �1 Q + Tc )oase in which: I= rainfall intensity (inches per hour) P1= 1 -hour point rainfall depth (inches) Tc = time of concentration (minutes) RA -6 (RA -3) 01/2004 Urban Drainage and Flood Control District Water Quality Capture Volume (WQCV) Calculations Job# 2019-052 WQCV = a(0,91/3 - 1.19/2 + 0.781) Equation 3-1 WQCV = Water Quality Capture Volume (Watershed inches) a = Coefficient corresponding to WQCV drain time (Table 3-2) I = Imperviousness (%/100) Table 3-2 (Drain Time Coefficients for WQCV Calculations) Drain Time (hers) Coefficient, c 12 0.8 24 0.9 40 1 V = (WQCV/12)A Equation 3-3 V = Required storage volume (acre -ft) A = Tributary catchment area upstream (acres) WQCV = Water Quality Capture Volume (watershed inches) WQCV = 1 (o.91 (o.2s3)) - (1.19(0.252)) + (0.78(0.25)) WQCV = 0.135 watershed inches (0.135 watershed inches/ 12)9.13 acres 0.103 acre -ft = 4468.98 ft3 Chapter 3 Calculating the WQCV and Volume Reduction 3.0 Calculation of the W CV The first step in estimating the magnitude of runoff from a site is to estimate the site's total imperviousness. The total imperviousness of a site is the weighted average of individual areas of like imperviousness. For instance, according to Table RO-3 in the Runoff chapter of Volume 1 of this manual, paved streets (and parking lots) have an imperviousness of 100%; drives, walks and roofs have an imperviousness of 90%; and lawn areas have an imperviousness of 0%. The total imperviousness of a site can be determined taking an area -weighted average of all of the impervious and pervious areas. When measures are implemented minimize directly connected impervious area (MDCIA), the imperviousness used to calculate the WQCV is the "effective imperviousness." Sections 4 and 5 of this chapter provide guidance and examples for calculating effective imperviousness and adjusting the WQCV to reflect decreases in effective imperviousness. The WQCV is calculated as a function of imperviousness and BMP drain time using Equation 3-1, and as shown in Figure 3-2: WQCV = 4(0.91/3 — 1.19/2 + 0.781) Where: WQCV = Water Quality Capture Volume (watershed inches) a = Coefficient corresponding to WQCV drain time (Table 3-2) Equation 3° 1 I = Imperviousness (%/100) (see Figures 3-3 through 3-5 [single family land use] and /or the Runoff chapter of Volume 1 [other typical land uses]) Table 3-2. Drain Time Coefficients for WQCV Calculations Drain Time (lips) Coefficient, a 12 hours 0.8 24 hours 0.9 40 hours 1.0 Figure 3-2, which illustrates the relationship between imperviousness and WQCV for various drain times, is appropriate for use in Colorado's high plains near the foothills. For other portions of Colorado or United States, the WQCV obtained from this figure can be adjusted using the following relationships: WQCV) = d6 Equation 3-2 0.43 ) WQCVother Where: WQCV = WQCV calculated using Equation 3-1 or Figure 3-2 (watershed inches) WQCVother = WQCV outside of Denver region (watershed inches) do = depth of average runoff producing storm from Figure 3-1 (watershed inches) August 2011 Urban Drainage and Flood Control District 3-5 Urban Storm Drainage Criteria Manual Volume 3 Calculating the WQCV and Volume Reduction Chapter 3 Once the WQCV in watershed inches is found from Figure 3-2 or using Equation 3--1 and/or 3-2, the required BMP storage volume in acre-feet can be calculated as follows: v _ (wgcv} A 12 ) Where: V A WQCV 0,500 0,450 0.400 r _ 0.350 Qi 0.300 r eh c 0.250 0.200 a .m 0.150 O 0.100 0.050 0.000 =required storage volume (acre -ft) = tributary catchment area upstream (acres) = Water Quality Capture Volume (watershed inches) r40 hour drain time WOLV=a(0.9113-1.19P+0.781) r• 12 -hr drain time a = 0.8 24 -hr drain time a = 0.9 40-h r drain time a = 1.0 24 hour drain time i h A2 hour drain time 0 0.1 0.2 0.3 a4 0.5 0.6 a_ 7 0.8 Tottar imperviousness Rano 10100) Equation 3-3 c .s Figure 3-2. Water Quality Capture Volume (WQCV) Based oil BMP Drain Tri}L .e 3-6 a V 1 Urban Drainage and Flood Control District August 2011 Urban Stour Drainage Criteria Manual Volume 3 Fr!, WE LD COUNTY C ?N1.INF MAPPING 4 _r• 2 . . I *14 I .1 it 1 hite2 ifs WI: 41 tea3 F w+ 41 it i as air r lli rVi , .4Wire Jr # r - _- if.a 40= asi t S a V tit e t vk It Nt N ii 1 1t 'P 1;3k 4 ' t I 4 is fir + er"4la."y kkt \\ss ' 4 4i : jrt ls I r1 r 4 t Pal, I 1 45 S * rS I' 01 idIla!-. itis L:11:4\-.4 te 1 CL 1 ar .011 # a le) cret 4862 Li 2,234.2 WGS_1984_ Web_ Mercator_ Auxiliary_ Sphere a WeldCounty Colorado 1,117.12 2,234.2 Feet This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or may not be accurate, current, or otherwise reliable, THIS MAP IS NOT TO BE USED FOR NAVIGATION r: -.r'• Z1: I,jF. D, ' 1 ezt r Legend 1 ,J Parcels Address Label Highway County Boundary Notes Hello