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Home My WebLink About20123007.tiff DRAINAGE REPORT Drainage Report Big Thompson Investment Holdings AG PRO AGPROfessionals, LLC 4350 Highway 66 Longmont, CO 80504 (970) 535-9318 Date s,22 2012 Table of Contents Certifications 3 Summary 4 Project Description 4 Drainage 4 Drainage Design 5 Basic Data and Location 6 6."]0L' Final Drainage Report Page'_oi 0 Big Thomason Investments Certifications I hereby certify that all portions of this drainage report have been performed under the supervision of, reviewed by, or preformed by this professional engineer, licensed to practice in Colorado. To the best of my professional knowledge,judgment and belief, these plans meet the provisions of Sec. 24-7-110. � =—• t'Ais( 'h is tip • i' ' IGcn' .,j iii, p1lt '- 7 t,`�N�� EN _ Chad Te Velde, P.E. Elliot DeJongh, E.I. AGPROfessionals, LLC. AGPROfessionals, LLC 8._21:o12 Final Drainage Report Page 3 of b 6i^Thi•ninsnn Invetmenls Summary The property under review is being evaluated for classification as a minor subdivision. Lots within the subdivision will be used for a variety of business types with primarily industrial use in the I-3 zone district. The property is currently zoned I-3 and is being used for agriculture production by raising various crops. Project Description In general the project will consist of developing current agricultural land into an industrial use area. This development will include but not be limited to subjects such as road construction, site drainage, utility implementation, over lot grading. and storm water controls. The property is located southeast of the intersection of Highway 85 and Weld County Road 44 in the west half of Section 23, Township 4 North, in Range 66 West. Parallel to Highway 85 is the railroad tracks including a 200' right of way extending toward the southeast which forms a portion of the property's border. South of WCR 44 exists the Western Mutual irrigation ditch and this serves as the property's northern border. The eastern edge of the property is varied in shape to allow for effective use of neighboring farm ground while the southern edge is formed by an access road. No other developments are located within the near vicinity of the property. Various use properties are located along both WCR 44, Highway 85 east side frontage road, and west of Highway 85. These properties primarily include residences, agricultural produce storage facilities, and mechanical repair businesses. Property development will coincide with current area uses at this time and should not significantly change the local area. Acreage of the property is approximately 113 acres including right of ways and is comprised primarily of agriculture production ground. Three main fields of various shapes are located on the property and are graded for flood irrigation practices. Access roads for crop production and oil and gas exploration divide the property into the specific fields. General topography of the site slopes toward the east. Soil types of the subject property are typical of the region being comprised of sandy loams with mild slopes. The Western Mutual Ditch is located along the northern edge of the property and a local irrigation ditch is located at the southeast corner of the property. Drainage from the site is directed by grading implemented for flood irrigation. Water is directed toward the southeast corner of the property- using ditches and flows into the irrigation ditch to the tailwater return. Drainage The drainage of the local area is directed toward the South Platte River which is located northwest of the subject property. The South Platte River, in this general location, flows north on the west side of the property'and then transitions toward the northeast. General drainage of the area is defined by local roads and various irrigation ditch locations. The Platte Valley Canal and the Evans #2 Ditch are located approximately 2 miles to the S 222012 Final Damage Report Page 4 sin I3iz T:;:r nrten F.ar.nenr south of the property. From these elevated structures, topography indicates drainage toward the northwest toward the South Platte River. Specifically at the subject property, drainage is toward the southeast into a general drainage path that flows north. The extent of the 100 year floodplain of the South Platte River is located approximately 2 miles to the northwest of the property. The property is not currently in the 100 year zone. As evident, based on the property descriptions, the area has several local irrigation ditches in the region due to the predominate land use of agriculture production. The local drainage from the subject property should not significantly affect the local ditches. Affects on drainage will be designed to be less than historical averages due to proposed stonnwater control features intended to limit the outflow rate during a significant storm event. Currently, no stonnwater control features are in place and during excessive rain storms the drainage can be overwhelming to the ditch located at the southeast corner of the property. Off site drainage in the local area is primarily directed by borrow ditches and county roads in the general land use area. The combination of relatively flat topography and constructed highways and county roads are planned to control any offsite drainage from being an issue on the property. Drainage Design Drainage of the subject property will be implemented by grading of the developed sites to ensure drainage paths are defined. Primarily this will consist of directing sheet flow from individual properties toward diversion ditches that will deliver stormwater to a basin that is designed for controlled release of stonnwater. Off-site runoff from surrounding property is not changing. The existing grading and structures should continue to prevent run-on from being an issue. More specifically, the property is proposed to have a central road crossing the property from \VCR 33 going east and then curving to the northeast and joining perpendicular to \VCR 44 on the north and east edge of the property. Lots that are located north of this proposed road will be graded to direct stonnwater toward a ditch located on the northern edge of the proposed road. The grade of the ditch will flow toward the middle of the site and allow for drainage to pass under the proposed road toward the south. This primary drainage path will continue toward the south and collect additional runoff from the lots located on the south edge of the road. These lots will also have drainage directed toward the southern edge of the lot and then toward the middle of the site and allow for drainage to join the main flow path and enter the earthen stormwater control structure located in the southeast corner. Drainage evaluations were perfot rued by using the Weld County Storm Drainage Criteria and Urban Drainage and Flood Control District (UDFCD) information as a reference. Flow rates and runoff volumes from the historical use and proposed development were evaluated and incorporated in the design. The stormwater detention pond was sized to contain the runoff volume created from the developed site for the 100 year storm. Due to the size of the site and drainage conditions it was determined that using the UDFCD spreadsheets that incorporate the Modified FAA form of the Rational Method, were best suited for calculating the required detention volume. Proposed use of the site is for light 6.22 'u122 h,nal D aim=e keport Page 3 of b Big llnc�;..•c Im s!:ners industrial use and there for the corresponding percentage of impervious area of 80% was used, based on Table RO-3 from UDFCD. Design storm depth information was calculated using the Precipitation-Frequrencv Atlas (idle Western United States, Volume III- Colorado, published by the National Oceanic and Atmospheric Administration (NOAA). Based on this information the required capacity for the detention pond is 24.4 AF. Stormwater detention basins are required to be emptied within 72 hours and can he released at the historical 5 year undeveloped runoff rate. Using the historical use of agriculture with a percent impervious area of 2°0, the historical runoff rate was calculated as 14.7 cfs. The detention pond will be located in the southeast corner of the site and have inlets from different points along the northern edge. Minor stormwater flows primarily from lots 1, 2 and outlot A will come from the west along the southern edge of the property and enter directly into the pond. Runoff from lot 3 will flow toward the south and enter in the north edge of the pond. Flows from lot A, S and 9 will be directed to the proposed culvert under the road at the southeastern corner of lot A. After passing under the road, flow will be south between lots 4 and 5 and converge with flow from lots 4,5,6 and 7 prior to entering the northeast corner of the pond. Potential drainage issues associated with natural grades will be mitigated with site grading to allow for drainage to the detention pond. Specific areas of concern include the northeast corner of the property. This area will be directed to flow to the pond with positive drainage through the use of berms to prevent runoff from leaving the site and drainage swales which flow toward the pond. A proposed outlet from the bottom of the pond will release water to the existing low area located east of the pond and continue toward the south and east through existing ditches and drainage paths. Release rates will be at or less than the historical 5 year undeveloped rate. An emergency spillway will be located on the exterior banks of the pond and sized to allow for flow rates expected from the developed site's 100 year storm event. Basic Data and Location • Location and area drainage map • Soils map • Soil survey engineering properties • Soil survey hydrologic soil groups • Runoff data x 22.:ui' Final Drama„e Report Page 6 0l b • k . • Vi \\.„-f .r N---......„ ill'S\\ i 6 i .. \ c N GI c \0 'Ns-it` h' o �I c C1 ��N \ d \\z 'f '�t7y [Cyr �c \ ___.. \ • A. a\y \� \�` 'I\� 'A Cam'' Y `•LIJ jy a • `i ate,.. 8� `. 0 3\N . i _ i / ,n'_ ( N y� / l ! . ' ,VI %• is Ira Ykc - _ to l .�.,�� { I :;) �� AGPROfessiooals. [At HIGTHOMPSON INVESTMENT HOLDINGS ,� molrm@ DAM R�',.; GENERAL LOCATION AND DRAINAGE 1OF1 I � � F ' cv ate.. fn.,.. / e1' N toou1v u �a: Yr-Z., / Itl_V3n- r/� n -2 --- j\' b 2 f 1. if. to /1 a '1' z — - f „ ri- moan Win: /� ^ .,ems .�..� N � .,.v R E S ThwI 7777 D.\TE �l`��i�A�fessionafs, LLC BIG THOVIPSON JAS 3„01, INVESTMENT HOLDINGS I OF 1 Scil Map—V/e:d County.Colorado.Southern Part (Big Thompson Investments) 52.YC '210'0 _.77'00 __.__., 52^00 __ _)] _.1500 &.euC ...':A C;zCC r 1 Li 4 r.E 4 Cl iie I - ?. - f w .Y r At, r 11 g is I R i_. I 7 L ..C ' ��pprr'' f S F g l l3 l ['I '1 If: f 1 � I TS ' - --_ j • 1 • 1 • r 8 } 40''74.. 3 _ .. ._ _ { G,t_�, 520500 521CC0 521100 521200 521300 521400 521500 52:6C0 521i CO 5218Co Map Sale. 15 220 1 ported on A size 15.5'x 11'),feet N 0 50 tca 200 200 M,ten /f, Feet / 0 200 400 800 1200 USDA Natural Resources Web Soil Survey 5/1/2012 a Conservation Service National Cooperative Soil Survey Page I of 3 n u m E `o O C C1 0. 0 7 CI o - c 0 m 0 O - Co i — c 0c) N H o t 0 ] 1+ CI CJ — i m 2 '00 'n c t° 3 c a 3 `o V o D c c� c E � >. o o = 2e D a '. yo ° D n A " H L c a ` C o C n E C u <2 -5 o D a co _ 'C c O V O r a 0 o m o a o = N 'O m E Z 7 ci a c o o 't--O^. U o el v n 0' O i 0 N r d 2 > n U N O • h d E ° C-2.1 E yOj 0 G 62 t C J — o F = LC Z o O m < m 3 - 0 c a E m 0Z Q n v E2 . o u m m c v m E U..4 a o N L 3 w - a '^ C D m nt n u 0 � D U a o < a O C T > . . r3 C o 3 0 L • EC r O E T g y LL 9 0 a D a- 0o L o a cN E o o c a 0 300 E n Z O a o O cc C c a C ? Et U.N W ti ' d N a E o >. .0Ea0 h m D 0 0 >00 3 v a o C< = U O 0_ n a N J E m > > o L C 2 C o L C m ° N >0- 0 n Z DE c17-, .. g O N N N E E L S T N G1. N N N O 01 o c a2 E0O a O CmFo Oa tiro uD < a F LDpn V N o y CI CJ c v2 O 'OC .12 DT 2 < O t D DJ 0 H g Oc E5 H N uN 'o cm` coo " on0m J > ^� `° c `^ m =� v v o n-' o a m 'o z a m o m E 0 5 H 3 uEan EE 050 f- mto o rL- o =`O a >, E w` 2 J aS m o c a 0.:',S N v E J , 0 w — ` 0c rnm U C n o " N o 0' c a 30 = E 0 0 m 0 0= c x > _ D a o rt 3 a 3c_, a N U o z m m a M 2 1 E m m m a O N c % N E 2 p a a — r N L LL - O L 22 *1 a = ` C' G To Y _ 0 N J ?i O C U' N O 2 U . N m p C J O R m Z 8 m a W W a — a < 3 $ rC _ a m o a m t o _ + a x ° 3 p 0 n v a c o a r o `o O a i° c uai m m — a a oa u < o 3 x o ? m 'v — v a c `o = t O m c `o u Q : o 80 Ea N Q © © U 0 0 0 U f `d 1` a C N N (° N N N N N C a 0 0 E 9 2 = ❑ o m m J ® X • >: •. ® < 4 X C) ® > + : : Iii o 0I o t A O 0 N M O ZU C7 Se I'.I r _Id Cc.. .y Cotcrodc Seut:tern Pas Pi Inerroytym la.ea:n e:-.s Map Unit Legend Weld County, Colorado, Southern Part(COS13) Map Unit Symbol I Map Unit Name I Acres in AOI I Percent of AOI 11 Presser sandy loam,0 to 1 percent stapes 40.4 34.8:3 12 E o»_r sandy loam. 1 to 3 percent slepes 30.5 23 233 30 Julsburg sandy learn_ 1 tc 3 pereent 45 3 30_0 3 slopes 51 Otero sandy loam. 1 l0 3 percent slopes 0.2 02'/0 Totals for Area of Interest 116.8 100.03/4 1.504 Natural Resources Vies Sod Sunday 5;1120;2 a Conservation Service National Cooperative Soil Survey Page 3 of 3 __ :i . .r» s�_ e-r rEIr. F'a T r peon tr4 e ,_, Engineering Properties This table gives the engineering classifications and the range of engineering properties for the layers of each soil in the survey area. Depth to the upper and lower boundaries of each layer is indicated. Texture is given in the standard terms used by the U.S. Department of Agriculture. These terms are defined according to percentages of sand silt, and clay in the fraction of the soil that is less than 2 millimeters in diameter. "Loam," for example, is soil that is 7 to 27 percent clay, 28 to 50 percent silt, and less than 52 percent sand. If the content of particles coarser than sand is 15 percent or more, an appropriate modifier is added. for example: "gravelly." Classification of the soils is determined according to the Unified soil classification system (ASTM, 2005) and the system adopted by the American Association of State Highway and Transportation Officials (AASHTO, 2004). The Unified system classifies soils according to properties that affect their use as construction material. Soils are classified according to particle-size distribution of the fraction less than 3 inches in diameter and according to plasticity index, liquid limit, and organic matter content. Sandy and gravelly soils are identified as GW, GP, GM, GC, SW, SP, SM, and SC; silty and clayey soils as ML, CL, OL, NIH, CH, and OH; and highly organic soils as PT. Soils exhibiting engineering properties of two groups can have a dual classification, for example, CL-ML. The AASHTO system classifies soils according to those properties that affect roadway construction and maintenance. In this system,the fraction of a mineral soil that is less than 3 inches in diameter is classified in one of seven groups from A-1 through A-7 on the basis of particle-size distribution, liquid limit, and plasticity index. Soils in group A-1 are coarse grained and low in content of fines (silt and clay). At the other extreme, soils in group A-7 are fine grained. Highly organic soils are classified in group A-8 on the basis of visual inspection. If laboratory data are available, the A-1, A-2, and A-7 groups are further classified as A-1-a. A-1-b, A-2-4, A-2-5, A-2-6, A-2-7, A-7-5, orA-7-6. As an additional refinement, the suitability of a soil as subgrade material can be indicated by a group index number. Group index numbers range from 0 for the best subgrade material to 20 or higher for the poorest. Rock fragments larger than 10 inches in diameter and 3 to 10 inches in diameter are indicated as a percentage of the total soil on a dry-weight basis. The percentages are estimates determined mainly by converting volume percentage in the field to weight percentage. Percentage (of soil particles)passing designated sieves is the percentage of the soil fraction less than 3 inches in diameter based on an ovendry weight. The sieves, numbers 4. 10. 40. and 200 (USA Standard Series). have openings of 4.76, 2.00. 0.420. and 0.074 millimeters, respectively. Estimates are based on laboratory tests of soils sampled in the survey area and in nearby areas and on estimates made in the field. Liquid limit and plasticity index (Atterberg limits) indicate the plasticity characteristics of a soil. The estimates are based on test data from the survey area or from nearby areas and on field examination. Lsex Natural Resources Vies Sad Suriev 5/1/2012 �'� Conservation Service National Cooperative Soil Survey Page 1 of 4 o _. . . 'Ccc'/ C r_ral., Scutein,Par: 6h Trc _�n References: American Association of State H;ctmvay and Transportation Officials (A SHTO)_ 2004. Standard specifications for transportation materials and methods of sampling and testing 24th edition. American Society for Testing and N1a'ena!o (ASTPd). 2005. Standard classification of soils for engineering purposes_ ASTP,I Standard D2437-00_ LJCI Natural Resources Vies Scil Surrey r. '% " -1 gi l/2o,? a Conservation Service Nal:oral Cooperative Soil Sir-rey Page 2 0(1 T I -... _.. - - X .5.' N O^ L.-, e 2 - - C a C. — _ Z c H Y —_-- . _ of o —.-_.. — ci C.— J - C 1 C - I _ _ O O O t O Li u C n ^i s u n` :1 X C4 C ( r C 0 a` rr) r U E CO C O (; u Q c a O O o a O o n co N N C C N O o C 6 6 6 6 ` N C1 ut Li n CI C7 C: Cl, C - - C) H a n t°2 n o c o c o c c Li O c u o 4 c cc N cl O C Lio d o — n n N c n r- O n Cl) t, C d u N o c O O O O O O v O o O O c O C o a o o '7 o c O 'o r ci oi c r 0 o c x1 • O T N N U S O _O a cn O • q C M U C 0) N LI O G c O o O c O a 6 T c ai o E —__—_._ — ___ - __ _ , 0 N o C n - m i. ly O ? 7u. :7) c n `u G o _O O a ./l a N U o o c O O O O O -, c 7 O N E u i— of < c,/ 3 U 3 o 0 c c c < , c N a) yl V Qa 7 rc CI e- CI < a CI r O t _ < < < < _ < _ G < G Z N 2 2 n o 6 2- C.) 0 a == CO z C6 2 U 5 o'l U z. 3 C, n 60 0 dv; 2 6 z o 6 °' 2 L IQ C Cl) (.: 0) O: 0: U; 0) U. ✓ m o Q. D O - T L L c o o ` a c> vni It 2 0 m u c' a n °- N w o 0 9 ">' - u, � a E > � o - > E - ^ N CO C) C - n c ? N %'n n r O O N N - C L. N N D C T T v >.- - T V: •mm �C'O __- .__ _ __ -_..__-_-_-__--_-- u CI C N N _ O V W _ _ a O (C- 0 V in O a 15 UI C: CI I = .- o x o o m c r; u o n o 0 w CI {'1 O I') Cl 0 `. T L al o _ O u ro co Ft c = a u - C N w c > c c c _ 0 In In n T C T o n o Z 0 >>>" G c a° 3 N - x in C 4_ u A N J ^' N C m ? 0 N C n V C 5 J - N N o J Co N Co n o - I ._ c in J LE Hydrologic Scil Group—Weld Ccunty.Colorado,Southern Part (Big Tnomcscn Investments) ..BrO _2'(200 521 C 52'200 -.- 521:50 52,EX 52:2'U; 52,2x --ea; ,._. - e� y a Y3 P I/ ft ii-J. lme ` !' #/7 o 4. "Kir / - ' , o rr jV s �• s oftEll I Zcit 1ir ii .. — r s 1 f,. F- . I7621 - E -. -- _� 8 ii - s 1 )f" F i ( L P ' . • ___ _ q 520500 521000 521100 521200 521300 521400 521500 521600 5217CC 521800 Mao Scale: I e 2201 me:son 3 sxe is 5'x 1 M)steel Meters S N 0 50 100 200 300 $ 21 ( 0 200 40-0 1.200 O'A Natural Resources Web Soil Survey 5/1/2012 Conservation Service National Cooperative Soil Survey Page 1 of 4 C! v. N O, o O o a o a p C N o _ E N o v - = E E o1 CO N 2 - — v N n g' tG S O C 1J - o• 3 ' CO C) E V J. o Ti J Z ed D . m y p C e' D - coo O 0 U II D c c o C Cf E C 0O D N c j 't y o _u N c O'O v o CN v - `° o m E Z c ci Cm NE O o 0 -5 o Nn o O E c v e� E m 4 vv0 v N ry a D u 2 r 2 U y o r = r r IA Cl N E N E v N N z c Z -. N V E i CQ V 3 L `o c o rca o Z G Er. a t 2 E C N o CJ• W c. CJ E U'0 Z Q 2 ' L 3 `" p D y N �. V - N , - U Cp N Q o = cri jkj ,s!I O 0 C cw o _3 To 'in H vE c N N J 0 !A > > N t Co 0 G0OEc a ZC '^ 0O N 0 E E E t .c T N .S 0' N N O 01 C C CJ T 2 v v O1 U v E E of T J 2 'o E Al o f m j0] „o Q � m Ea c.=0 '2 J co 02 —' 0 �` E fn v 5 C >, 92 'y c m !_^ r o N E '- c -. vv `o - m D Q 0 0Dc>c E 0 .N co' v D E L y _ v o c o ` 7 J. N .c v l c C N O!C U N a c W N a a O E cep: m U - 0 fNJ = n O m N 2 v y G P C N T. L 0 0 'Q o N O 8 O L 8 O E L E 0 .c 2 I- 3 wECN E E 030 F- = NN O F- O E TO J T 01 W 2 O J cn D H _ aiE wo p v 2 c O 15 E J 7 V - Tc - N E C a 8 J co c. O c a o U O v o a c " 3 E m I O c 6 L O 6 J o z 0 0 U " 0 N U 2 O O 1 O C Q q a } a Z - c U 3 W .2 o a O 5 C 0 0 a m y O 0 V O W : 'o 2 -42 o E _ 'o ¢ - a m ¢ Cl a < a o m U U o Z 3 u E .°) _`o c c o 2 m c m' II— el rl t a 3 it al N 2 U p r (n O raz O O I a it a 0 N 0 76 O 2 U Nit Y C E. E. X O C _ U N - c - C E. C Z Z - Z cr Z.; c E of o of I ' I ' I 0 0 U 0 O O F▪. N IT re >• O N O l: o < c o `CD N o o Inc 0 c O Cl C l: < 0 L C N q C O o O O U O G CI 0 0 0 O O U n n N C U C O O C U < O C O a a o .c 0 0 ti, C O O T o . o 0 q N . u a U C C O O O o o C C >' o E > co OU LL E o n >` G 2 U _- U a a W _c L U G o O C a n a U o a a O Cr) • a N < < G n G G al c C. o Q N N '-< < N ? u Q G G < < Q c 75 c Z E U o, o n a a U) CO U; . CO 2 U _F U O Cl c 's 2 CD 0 c In mac) 0 0 to N o U >` U T Nc c - c C O N O a = It O IT) a C !%) U a CI C J-I U < 3 `_ E CJ ' >. a C _ r r Q c Co r C T r N 2 0 0 ° a L U .C c _ ' __ O o T T C N 4— y r ? a r U r 5 j C a) O U' !n N V: L N _ _ __ __.._ _ _ _ Ou o r U oo Z n u • c a N co0 o L N N O O o I� `- ,— T m o o Co. O N O O O //1 C C _ -o — V(Q! J >. � voi U C = v r n �I N N -' c G = T) oo :n c Tn (n L'7 E E „ m — y 0 A r o H_ o v r m L. U v` c v c G - a - c A p o a o ry o a v I v � _o -, O v 0 0 rl/e'r_ Sod Cr- eid Ceunly Colorado Sa '._, a,. Bey% r. :an 1. . ._...s Hydrologic Soil Group i Hydrologic Soil Group—Summary by Map Unit—Weld County, Colorado,Southern Part(C0618) Map unit symbol I Map unit name I Rating I Acres in ACI f Percent of A0I 11 6resser sandy loam,0 to I percent 5 40 4 34.510 slopes 12 Dresser sandy loam. 1 to 3 perzert 6 30 5 25.2% slopes 30 Julesborg sandy loam. 1 to 3 B 45.6 39.0% percent slopes •51 Otero sandy loam. 1 to 3 percent 5 0.2 0.2% slopes Totals for Area of Interest 116.8 100.0% Description 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 (A/D, B/D, 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. 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, B/D. or C/D). 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. ISCA Natural Resources Web Soil Survey 5/1/:012 ® Conservation Service National Cooperative Soil Survey Page 3 of 4 B; ps:n Rating Options Aggregation Method Dominant Ccnd Lion Component Percent Cutoff None Sceci`ed Tie-break Rule: Higher LSCA Natural Resources V/cc Soil Survey 5;1/2012 Conservation Service National Cooperative Soil Survey Page 4 or 4 DRAINAGE CRITERIA MANUAL (V. 1) RUNOFF Table RO-3—Recommended Percentage Imperviousness Values Land Use or Percentage Surface Characteristics 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 80 Heavy areas 90 Parks, cemeteries 5 Playgrounds 10 Schools 50 Railroad yard areas 15 Undeveloped Areas: Historic flow analysis 2 Greenbelts, agricultural 2 Off-site flow analysis 45 (when land use not defined) Streets: Paved 100 Gravel (packed) 40 Drive and walks 90 Roofs 90 Lawns, sandy soil 0 Lawns, clayey soil 0 See Figures RO-3 through RO-5 for percentage imperviousness. C, = + 1.3113 - 1.4412 + 1.135i- 0.12) for Ca ≥ 0, other,vise Ca =0 (RO-6) CCD = KC) + (0.8s8i 3 - 0.786/ + 0.774i+ 0.04) (RO-7) CB =(CA + Cco)/2 2007-01 RO-9 Urban Drainage and Flood Control District Colorado Precipitation Frequency Data -- OUTPUT PAGE Pace I of 1 Precipitation Frequency Data Output NOAA Atlas 2 Colorado 40.298276°N 104 . 751441°W Site-specific Estimates Precipitation Precipitation Map (inches) Intensity (in/hr) 1 . 35 0.23 2-year _ _. _ 0. 9 / Ic_- __ 6- 3.25 C. 33 hoer ce- year _ . =2 0. 12 24-here Hydrnmeteorologica_ Design Dest Studies Center - NOAA/Da-tonal Weather Seci__e 1325 East-West Highway - Silver String, .r 20910 - (301) 713-1669 Fri Aug 17 13:23:33 2012 http://hdsc.nws.noaa.goc/cgi-bin'hdsc/na3.pert?qlat=40 298276&glon=-104.751441&sub... 8/17/1011 in TPROies,ionats, 1.LC. Project Number: 1226-06-03 Date: 8/17/12 5:42 PM 4350 Highway 66 Designed By: EDJ Sheet: 1 of 1 Longmont, CO 80504 Checked By: Telephone (970) 535-9318 Subject: Big Thompson Investment Holdings www.aR'oros.com Estimating rainfall using NOAA Atlas 2 Volume III Equation for region 1 -Table 11: Inputs: 2-yr 1-hr estimated value(Y2) = 0.94 in 100-yr 1-hr estimated value (Y100) = 2.59 in 2-Yr 6-hr value from map (X1) = 1.35 in 2-Yr 24-hr value from map (X2) = 1.78 in 100-Yr 6-hr value from map (X3) = 3.28 in 100-Yr 24-hr value from map (X4) = 4.42 in point elevation in hundreds of feet(Z) = 47 100's ft Y2 = .218 + .709 x (Xi)x (X1/X2) Y2 = 0.218 + 0.709 x ( 1.350 )x( 1.35 / 1.78 ) = 0.94 in Y100 = 1.897 + .439 x [(X3) x (X3/X4)]-0.008*Z Yiao = 1.897 + 0.439 x ( 3.280 )x( 3.28 / 4.42 ) - ( 0.008 * 47 ) = 2.59 in Estimating other 1-hr storm amounts: Inputs: 2yr precip depth from Figure 6 Nemograph = 0.94 in 5yr precip depth from Figure 6 Nemograph =' 1.33 j in 10yr precip depth from Figure 6 Nemograph = 1.67 ' in 25yr precip depth from Figure 6 Nemograph = 1.95 I in 50yr precip depth from Figure 6 Nemograph = 2.25 ! in 100yr precip depth from Figure 6 Nemograph = 2.59 in Eqn: 2-hr = 0.342 x 6-hr + 0.658 x 1-hr 3-hr = 0.597 x 6-hr + 0.403 x 1-hr 1-hr 2-hr 3-hr 6-hr 24-hr YR 2 0.94 1.08 1.19 1.4 1.8 5 1.33 1.42 1.49 1.6 1 2.5 10 1.67 1.75 1.81 1.9 2.9 25 1.95 2.07 2.16 2.3 3.4 1 50 2.25 2.42 2.55 2.5 .3:9 j 100 2.59 2.83 3.00 3.3 4.4 6 hr& 24 hr plotted on fig 18a pg 17 between 2yr and 100 yr DETENTION VOLUME BY THE MODIFIED FAA METHOD (See USOCM Volume 2 Storage Chapter for description of method) Project: Big Thompson Investment Holdings Basin ID: Developed Site (For catchments less than 160 acres only. For larger catchments,use hydrograph routing method) (NOTE:for]ar:omen:a Tager than 10 s:es,CCHF n'1Crogoph and routing are recommended) I Determination of:MOSER Detention Volume Using Modified FAA Method Oetermfnadon of MAJOR Detention Volume Using Modified FAA Method Design Information(lnout). I Design Information(Input): e a''<.xerl Cra��almle-.075 4005 1.e e3:o -"05.. „examen sr,raga r._n0_ire1s le= so:a is?:? I Cs:-r.:eri.2:1 rase ars= A= 113.29 Ca'_. "Hs race r A. 113 3 5 F n "_ Tees B 4 0. .ern ,,,,,,,,,,,,s 4 irSi= 9 A.3 C.c'0 R T= 100 r" 1 5_r. ,..., 6,m5a ,.o _, i- -0 I'"4.'251025 o.or I:C1I I T rue nl Corcar0ean 5l:ls!srsres i.-= 74 Tmae!_creare3,4n 0!41423,440 i_= 24 as i'_asa lava 9= 0 13 Ra easaia:a 9= 0.1] aace r C P;= 2 3 _s C 017 P.= 253 '1175 Design Rainfall'OF Formula i=C:'P;IIC1.Td7C9 On sign Rainfall:DE 7 cumuli 1=C:'l's IC1aT,l-C1 2450 C0el0e-00re G,= 2953_ CenticeYTVJ C: f0 self<e:i.n L.= 13 CsofHerl TN. 01= 0.]93 Coe':<erl TN. C5= 0 73 Determination of Average Outflow from the Basin]Calculated]: Determination of Average Outflow from the Basin(Calculated): Remo cootrcert C= _070 Rsrenoeefrr ac c= 070_ Id'5.9 PeasRwN OTn=_]fi130 _cis Irf36?ea.'Rcvf1 Op'e= 36140 cfs Rmna c'e oaak OeY'Cx Rod. Opael= 0369 cfs a<..a_a aet 0.Tovr qSe Cws' 00.69 s Mod.FAA Minor Storage Volume= 101349 neat l Mad,FAT Maier Storage Volume= 1.067 354 cubic loot Mod.FAT Minor Storage Volume s31]49 r.:' Mod.FAT Major Storage Volume= 23369 acre.fl Ra:.dal Rn-Cal a 1:5',40 = A],'sLzerl'2 Average- CaPon Simon Ra.sfal Fana:I Irf5'x A3s'me-t 113'1'0 53ra3a I D,,,, In:enat/ Furor Cadre VoIsrre va.me cvn an bomb v‘'-':re Furor e_rov v"" 175 r eel cfs acc'eef 05001451 cfs a.e[feel es. 176 �� 176 lo- m,' 161 la 1 - .0 171 ." me e,.0 p 0101 41.061 0 c 019 0 a"n o pep pn 10 cp coo 1 mr 'D Sp 1.31 85455 I 052 I 911 I 54047 -- 100 0 4 932313 200 I 091 .03605 ' 060 I 911 'I 5361] 937.313 320 109 1137390 I 054 I 723 I 92.71] I 9]$313 200 1 103 , 1.13:300 I 006 723 90.70 l 937.313 900 I 054 1,230315 1 053 7.79 132]67 932945 300 i 090 1.137.300 051 I 779 132]57 99230] 500 054 11799381 l 052 7.79 I 230.327 040204 400 f 054 I $6.401 I 052 779 I 23092 1040,913 500 1 944 333.991 i 0 2 1]] 230 327 0'0353 500 0.51 1333511 I 0.5$ I 7.74 I 270997 I 911 700 047 1333 I 052 760 3]3,337 1 1091,527 700 04] 1300/544 I 052 I 700 3]9.397 I 1053520 ]CO 037 1_421153 1 0521 757 319:3] 1.061031 ]c9 0.37 I ,121.104 ! 052 I 760 313.137 1058431 900 r 0.34 142151'3 52 7.5] I 407.207 1 1051712 500 I 014 14515//9 1 0.51 75] 1 407,20] 1059131 900 031 1153710 I 0 75 I 407 2071041733 900 031 .493.010 I O ] 1 407 207 1.041733 1100 l 0.21 I 12]422 I 0 7.02 4003471.041.075 1000 I 0.31 1.493.010 1 Oct51 I ] 2 451 27] 1029073 1100 ! 027 1.524.422 o 1 I 75 I 535417 I 1014.172 1220 027 I 1. 5.02 I 051 7 5294t77 1.014.172 1200 0.2] C 0443 0 I 743 533487 I 97300 1300 0 2 I 1.580343 I 051 1 7-49 1 533.41] 1 1.014.172 1400 I 025 1.330 343 011 1 747 1 523937 I 997 3501300 0 2 1500907 I 0.51 1 747 I 927.90] 977351 1400 I 023 i 1.035.0113 I 051 1 74] 1 671327 ! 9]4.051 1400 I 02I 1636.01.7 I 051 I 7 4 I 67]02] I 9]3301 1500 I 0.22 ' 1.0033'810 I 051 746 I 711697 I 93]313 1500 02] 1093010 1 .51 74fi _l 67t6P j 95]006 1700 I 022 : 1675290 I 051 1 7.46 755737 : 914513 1700 022 I 1'475210 1 051 7.46 I 755.7737 L 915913 1700 : 020 1 16]5041 I 0511 7.45 703]37 1 912.203 1700 020 I 1.695040 I 051 1 744 I ]03]37 992.203 1900 019 ' 1715395 I 051 1 744 1 803 837692205 1600 010 I 1.715.09: I 051 744 647.307 I 057505 1900 013 I 1.735325 051 ]11 I 691.97] 1 04]944 2000 I_019 I 1735025 I 051 743 I 091977 04]940 2103 I Ole I 1753,205 i 051 I ]43 F 920.047 I 8117.159 2000 I 0.18 I 1.733205 1 051 I 743 I 891 977 617.159 2103 013 1770.205 I 051 7.43 920.047 I 790059 2100 I 017 1]53205 1 0.51 743 I 930011] 717.153 2200 I _ 0 1 1.7]0705 I 051 _I 743 .014.14 1 733.673 2200 0.1] 1_1‘.7_72.000 I 051 ! 743 .00..1] 763,570 2300 0.19 1804 Ise 1 051 7.42 I 1003,25] 1 735001 2300 1I 0.:0 I 1]04143 i 0.51 I ] 2 1009.237 1 733301 2400 0154 IB 193 1 O ]42 I 1112.327 I 707.007 2500 016 819.193 1 050 I ]42 7f 1.112327 707.037 2500 0.15 1.319193 0 0 7.42 2]2] 1 ]0]66] 2500 0.15 1119 193 : 050 132 ,10.332797 707.067 2600 i 0.15 I 1835339 ! 050 I 741 1,1500]97-1_6]9.342 2600 I 015 1835339 I 0.50-1, 741 1 1,1500,397 I 6]3932 2700 I 014 s403. 20 I 0.0 7.31 I 1200407 1 913]53 2701 I 0.14 1.350$20 I 050 ' ]. 200_67 1 633.]53 2900 I 0.14 ,s6 66 I 0.0 i 741 1.241,537 [ 620.129 2000 0.14 I 1%30066 050 _I _ 7 r .23537 I 620.129 2900 01= 2- 0 00 0 0 741 12600"07 I 590.099 2900 0.14 i 18]3706 1 050 731__I 12960007 I 590099_ 3000 L 01] 109402152 1 0 740 1332177 1 553."007 3000 0.1311.392363 I 050 . ]. 0 7 1,23267 I 55306] 3100 1 012 ,3[50'63 1 050 I 740 I 1,3]6,]3] 1 529318 3100 _ I 0.11 063 I 0 50 I 7_40 i 1376.7447 523916 3'.90 ' 013 916.623 L_ 0 0 740 1420387 I 49].00] 3200 1 013 1 13134.4 050 740 I 1420.35 49]30] 3300 0.12 1 1931 00 1 050 740 1463367 I 46'8,3]9 3300 0.12 1 1331,266 I 050 740 1 14 1 63.307 1 466379 3410 012 005 1 0 J 740 I 1. 3.051 433.043 3300 012 1943005 i 0.50 740 1509357 I 433043 3500 012 1,311019 1 _0 ] 720 I 1.553.027 1 202032 3500 I 012 .35]659 I 050 1 740 T 1.55302.7 1 302032 _3600 0.12 1907441 050 ]39 I 1.557 097 : 3]0341 3600 012 1 1.961v1 1 050 I' ]J9 1,59709] ! 370 344 3000 1 011 1.978.965 1 0 54 739 1635237 I 40'.003 300 011 30.243 : 0 3 7_33 _! 1.081.237 I 307.315 + 4]5.22] 305..06 ]BCD 0.111.900.$23 1 3000 0I1 30023] I 010 739 050 739 1.765307 I 2710011 3000 11 0.11 2.001230 I 050 739 17773377 I I 231732 4000 I 011 2002209 050 739 1 1773,377 i 231732 3.00 ' 010 : 2022.707 I 053 I 739 I 1.417.4]] I 206370 4000 I _011 1 2012.717 I 053 I 739 1 17733.7] 1 205.270 4200 0.10 2333]5 053 1 739 417 I 271204 4100 1 010 717 '' 050 739 . ]517 171.004 4200 010 _ 2113329 : 0 J 739 I 1305.55 1 171 43300 ' 020 121 050 719 199559 4400 _ 0'10 $453359 O 3 : 739_ 1149057 103093 _ 4300 010_ 343 ] 0371 ]043 4400 0.10 1 2,353152 : 0 0 739 ' 1,99373] 10399] 4400 I 010 2353,192 0.0 733 1,993657 i 03493 3519 009 2: 2192 I 050 729 I 2097]3] 33365 4500 011 • 2.072.192 1 050 733 I 2.937797 I 35354 1 ' 9999 _ 47700 009 2.3 .361 I 050 736 203]797 34363 470 009 2372._64_ 053 739 2.037 797 : 34:90e_I 4700 009 233.701 1 0`0 730 2125837 422 4700 _ 039 2]6 704 1- 050 733 2125.337 493 __ 0900_ ' . ; 2.170007 2'5209 4400 I 039 2.100]09 : 0 50 739 _217010] 09105 4903 033 2.100333 • p 0 730 2,21007: 10419 • 4900 0]9 2, 00391 050 1 739 2,2]0077 1 105 9900_i 1 _. _ ; _. 9000_ 5100 039 2.109941 0 0 730 2214147 .133.305 5100 ' 009 2.109941 050 730 2204147 : -134,305 5100 039 2.101941 0.0 1 739 I 2$02217 74305 5100 009 2 1 23304 05 7.30 1 $204237 179]13 5202 019 2127.524 "0 33 0 ! 720 L 2,342217 ]3053 5210 009 2227504 I 0 33 730 j 2.30221] : 15012 5400 039 2. :4734 3.0 739 2390307 20,623 5400 033 2.144713 ' 050 733 390.337 -245623 5500 I 075 2.1'371 4 0 1 734 2.334427 2 5313_ 9900__ 1302 0 3 2.1347b ' 050 : ]36 2390]5] 22362] 1 5503 • 008 2001 III . 0 i 730 : 2478497 $1'124 5560 1036 2.151.111 050 ! 738 12443497 $17129 0999 6"800 000 2'6']69 1 606 90]81 22]9 J9] 01],129 - 5702 025 2.100.0081 3. 0 77 3820 I 2.522007 1 053.359 5000 024 2 79 Oa . 0 0 935 2503037 -309101 5]00 I 000 2 77,-06 9 0 I 738 I 2522-37 -354103 5000 0 0 2 ] ,6 : 0 0 7.35 2016707 429202 5900 000 2.177 526 040 I 737 1 2.16707 ]25252 I 9000 096 2 93.353 : 0 0 7 3 2.554,]7] 1 425 5900 1 003 2.93.309 _050 _ 737 2.010.707 201002 0000 093 2'93:33 0FA 7 3 2553'P 1 46151_9 fi0^0 219345 00 ]ec 2653]^ 2fi1 003 Mod,Mod. 4.MiIser Storage Blum.ore.K1= 14.70957 Mot dFAA'AC.,ey ter pe VolumelcuYic A= 1.061,08) M U lJEC4 M nETENT:ON B AS1N cOLU STI592 on2.FAA Helot Storage Volume tAcre.ftl= 2.3]592 UOFCD DETENPON BASIN VOLUME ESTIMATING WORKBOOK Version 2.3.Released\larch 2012 oo-elengn_r2 3_09S0907.0.]270 tae.1 ad ski 1 91].2012.5. ?U DETENTION VOLUME BY THE MODIFIED FAA METHOD (See LISSOM Volume 2 Storage Chapter for description of method) I Project: Big Thompson Investment Holdings Basin I0: Developed Site Inflow and Outflow Volumes vs.Rainfall Duration 3,060,000 I I I I 2,500000 r-- - — I I I I I I I f.5oDoco __ a I I X66°.°°° • I ' • I I 500.600 ° • 6 1C0o 200 '• 0 3600 4000 I6 1 lOg 6000 7 00 I •. ee -500,000 I I ••••I I I I -1.000.000 ! I Duration(Minutes) I I UOFOD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.3 Released March 2012 LO-Seb,Me eta ie:c SPED SITE.*5 fe]:aT 3•:.20,2 551 PM DETENTION VOLUME BY THE MODIFIED FAA METHOD 1 I (See USDC.1Volume 2 Storage Chapter for description of method) Project: Big Thompson Investment Holdings Basin ID: Existing Site (For catchments less than 160 acres only. For larger catchments,use hydrograpS routing method) INCTS.for:3¢h.-en„s 12r0-r:Ban 00 acres.CUR?nydngrach 3n,]routing are re0cmmen0ec) Determination o161;YCR Detention Volume Using Modified FAA Method Y'J Determination of MAJOR Detention Volume Using Modified FAA Method Design Information(Input): Design Information(Input): Ca::rrerta'0245:r-0n1.e'_s-ese .= 2 3 .e..40 Ca'=r.:erl Bra-auernser.:_iress - I I. 2]] 0:1,0l Ca:_-nev ira.use A. 11]1.0 Ca_;,_ C r _ , ]C3 9,44,,,,,,,,,,,...-usa5a v T.se= B A 3el'7 s P 0.55.. B P.ZSC o R. :_e. ... T= 5 r3' a ] ...�1. q - r.. Use f Torus:rumsof'4]3=.r=i 7:0 22 +ea i. 1 TousuSmonsf164.,sred To= 2. mues T47 .= 013 _cl_9ee a]aee3 9- 013 cruce Ore'bv?a-calonp3 P= 1.33 urns Ore'1u4=_:_!:n P= 1.37 urns oeni0esainfall I0F Formula I=e,'PylC.,1=1'Ce Design Rainfall lOF Formula IT C.'P4(C.r3;1'C. - 2050Ccerr.1.71ThEl 24.0 914949 99774! Cs= 10 Ccefce-iTen Cr= In Cceiu gr.Tire, C,- 0.759 coretc ATIChee C,= 0719 Determination of Average Outflow from the Basin(Calculated): Determination of Average Outflow from the Basin(Calculated!: R:20heaeheerl Cr _ e..ral Coen.est e= DCe x a5icmC Qs-n= 2235 cfs IrurvPnae Ounce Co-n=_ 2225 cos A':nal.nenarc.S']neale Op—or- 15:69 A'.natn=ear o4e au ia.e Co—out- :21 69 cis Mod.FAA Minor Storage Volume=_ 1 cubic Nal Mod,FAA Major Stoups Volume= 11.111___cubic teal Mod,FAA Minor Storaua Volume= 0,$55 acre-3 Mod.FAA Major otel age Valuma= '.0:235 are.-ry ea r124 lam'al FIT'S' Austmert Amer CUP 5M-age n3' ms.44, Ireox r F1.7600 CUT_ry 5'ura- I D.famn Iversiy Von.re Cuff's. 1.147703 Tone Dveoco Irsry Volume A Feces Cullow volute Vnme mutes !mu,rh` abe•eel n3' o _ :feet 9,97 Io' r y1 mcv'l "ion few , 0 an 0 D 0,10 574 0 103 - 010 0 0 0 53] 0 9 , 100 Ow 0 0 z • sJa 1 579 i 1 03 7 u 44 r 1.]61 i AO'2 2 5 3 s.]a9 1ap 309 t 762 -t i.re _A ` 4,72 10.251 100 14.33 I 357e I 0.720 6 4.72 10,251 1:9 1 14.09 r ]526 6]2e 6 I 425 33]9 100 14 63 1 5233 1 8,51 6 4 25 12.333 1 1.00 I14 e3 I 5393 I 8. 51 8 230 I 16315 100 i 1A3 I 7,11 970! _ 6 239 I 16.315 1C0 1 14 03 7 _I051 9]53 0 J5] 9232 I 0 IJ 61 1 33:! 0528 10 357 19.42 100 I 1 e9 I ¢sic 4 10523 12 0.31 1 2 9 1 10 I 14 o3 10071 I 10952 12 I 33 2 923 I 100 L 409 1 12.340 I 10952 14 3 0 23!51 100 1469 l 12 102 11,111 2 90 I 23,161 I 1 on i 03 I 12 303 11.111 6 230_ I 25.6 CO 63 I 13.103 11033 1 373 25 161 100 I 1463 14,10$ ] 10,333 20 200 4 2e093 I.CO I 14 0j 17.065 19433 20 1 2]3 I 260093 : 1SO I 1409I la623 I10360_ 20 I 253 ; 26093 100 14 d9 17629 f0.laa 20 I I 253 I 2929] I 100 1 14on I 1]023 10465 22 1 246 20.342 06 1403 1 29272 091] 22 2.355 30542 I 1.90 10272 ( 93]] 2 224 60 23 052 14 18 I 29272 10474 24 224 1 20524 I 0:96 I 14.01 1 21254 I 10.474 26 2.$5 31.629 092 I la o 2U54 0413 25 ( 213 22 34 I 0.39 1 13104 22.123 I 103'73 23 2.15 ]2042 039 1].12 l 2205 1 10 L__ _29 2 1 22623 033 IJ 12 30 2 0 33 32 037 1 12. 3 22316 0000 30 296 11 3358$ 0 3 1223]5 0.03 32 134 34.465 i 031 1239 23.790 O87I 32 )- 12 73 2223705 10 0_ I AI 199 I 34.469 I 034 12 J9 1 23]99 i 10.071 J. 131 1 25302 1 032 _12.10 I 24,079 19024 34 _-_131 r35.303 1 032 1 12 10230079 ti I 10624 36 135 36091 0d 1132 250001 1 -31 36 ( 135 36191 I 031 11 33 1 2550'1 1 10531 1]8 119 36.339 1 073 1 11 60 1 26421 10 FS, ]8 I 1] 1 9 35.330 I 0.79 _I I,fig I- 26!43 1 10396 40f I.)3 1 27 54.3 0]3 11 38 I 27 12] 02 5 40 I 1]] 1 37.548 1 0]3 1 11.39 I 27323 1 10325 42 159 1 333341 076 I 11. 9 1 23$95 1 10.0 43 _ 168 L 28.24 I 076 1 11 19 i__ 29205 100:9 44 1.53 30.3 0 T 075 : 110$ 1 29:26 I 9.733 44 162 I 38 1.370 075 1 1102 I 29.026 - 9]93_ 46 ISS i 39,87 0 71036 1 29.060 I 9 519 46 1.53 39437I 074 I 1036 293631 9,519 48 J IS! 1 40379 073 i 1071 I_ 20315 1 9200 46 154 I 30.J]9 073 I 107 F 30.549 92'•0 I-_ 52 =3 O5] 0] 1045 31010 0 91 00 142 0 047 I 0 ` 195 I 3412 j 630 52 1.6 I 414 53 0 71015 j 3203 1 8 081 52 1 42 1 41 133 1 0 71 L 10 45 L 324_3 f 8.220 54 1!2 41.713 _1 070 103 JJ,l3] 032fi 04 l 01 4229 L 4.719 0]0 i 1035 33 493 ( 0,216 56 li I]9 42710 1 0.00 I 10213 34,2e6_I 7.400 _ 56 1 _ 1 30 42716 1 000 1013 35,255 2050 50 I 1.33 42.710 009 I 10.04 26137 7.400 60 1.33 2100 0. 0 1 t G 1 JJ 43.190 D d 100 26.13] _225] 60 1]3 10 3 3525 2560 6$ I 130 43 644 ' 0 d 0 32019 1 6"30 62 ] 49� 0 3 1 no F 37.01]_ _ ]450 I 0000 0 1 1.20 J 3 1 067 I- 9.37 _-L_-37900 I 6193 6! 124 • 44524 1 0 7 I 0 0 3._.2 I 6.743 6 124 : 44.994 I 007 I 977 27702 5.793 a 66 1.$J 5 0 ] 913 38.'32 5.12.2 66 125 "$3 00] 1 9]9 ]9]8$ 5,127_ _ ._ ea 1 IS 3'!.333 1 0 6 9.12 ]00"63. 5.3fi0 fi3_ 12$ 43353 I 006 1 9 7 392fi3 5200 72 I 119 3 J 1 0 955_ I 47 '6 .320 70 1 I19 5.74.0 1 066 1 9. 40426 L 4325 72 I 1.17 i 45136 0 05 I 953 r 07 I 3,329 72 1.17 1 421 0 65 1 9 59 3I 41.426 .324_ ]i I 1.11 I 4113! 015 947 L 42]0] I 3.310 74 1.15 01 0 05 55 1 I 9 53 1. 32,109 1 _3324 76 I3 6"72 0 94] • 44.170 11 3310 76 112 455026 1 0"4 I 47 I 4].130 2,102 79 1.I09 !63]2 I 0 3 942 44 170 1 2272 _ ]0 1 l 46 872 0 064 42 I 44.4]0 i 2.302 80 103 47 229 0 9.]fi 351 223 8 109 47 239 0a 3402 9 2 I 62,351 22'0 04 I 0 7 003 I 927 -I 5714 04 84 100 47.077 00] 9.27 _1 4571] 1205 000.0 0000_ I _ ad I 105 ! 47351 102 0fi I 927 1 : 120446 714 103 40.313 0.63 I 922 4651! 1301 86 76 912 I _ D 30 I en i o5i 36 1 I]] Mt i 0 63 j 9 2 r 5]590_ . fi5i_ 88 102 8 16 0 1 919 84.1 I— 99 05 ' a100 43 i4 1 052 9. 4 49450 1 93 —._.. _ 0000_ 94 304 9390 0 2 I 9.10 'j. 50240 ifi3' 52 _ 0:]G 4920! 0 2 9 50240 1921 92 0574 9 L 0.2 310 5 G a 01 9 959 49 0 2 10 050 2401121 .I 510 94 037 49511 1 0 2 906 I 5,1 1010 94 037 3.311 Oat 90 50.121 .110".- 000 0 53 236 _ 030 0 323 52 202 2790 96 004 0104 1 0 9 0 52,06] 2.710 90 034 0050 104 00 B39 5.301 7074 93 033 50 93 001 d 3 52301 2]90 IGJ 0 9 50]92 0 656 S3.6i .l l 100 0.3] 50352 __ 001 396 04647 -4.172 _ 73 -102 1 03$ 510 1 0 a3] 5 -4.577 102 032 • 50. 5 1 p 1 03] 5.528 ].577 107 I 032 50 2 0 637 1 1-55.523 -4.577 04 I 030 51223 I 06 937 5.410 1 _ 107 339 5 223 0 0 1 6 3 So110 01 103 ! 039 51.231 0 33 I 56510 5102_... _. .. 3 0000 __ _ 710 007 : 5.93 000 I 814 50,172 5301 148 • _G_33 p G _ 031 52291 1 _5301 110 0 0 3 0020 00 931 50 172 26" 1 0 000 5..761 1 J J 33 53 172 L. 8419_ III 006 l 24 0 0 679 59430 : )070 112 035 • 52261 000 879 53.331 _ -7073 I1! 033 5 15 : 0 0 t 3.141 60.017 _7.570 114 1 033. 265 I 000 I 6.70 I 60.317 .7.302 11fi 042 51515 03 6 L 71 61.64] A937 t . 0325 0 52 715 059 • 6.] 6001] 0932 0.000.. _.. . _ 120 031 53202 0."9 201 fi 670 077 110 031 52:02 059 :0.11 625573 I -9.377 120 031 1 SJ 202 059 90'e - 62 19 119550 129 pat 5]^02 053 1 194 • fi25]9 11511 M Mo.. FAMiners Storage SiIto- 0.2551 Mod.FAA Molar B loraga Value,(114914.770441= 02741 MLJ FARM nE o cL 03151 Mo2.FM Major Store Valuma h 0 g3' (.0re� = .2551 UDFCo DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.3.Released Marcel 2012 L...1.eaa. n 92-0_0010711.0 01T5.•od...FAA 6122012 5 52 79 DETENTION VOLUME BY THE MODIFIED FAA METHOD (See USOEM Volume 2 Storage Chapter for description of method) l Project: Big Thompson Investment Holdings Basin ID: Existing Site Inflow and Outflow Volumes vs.Rainfall Duration 70,000 . I I I I I I i I I I I I j 50,000 I 40.000 l u. 30,000 I __ a I i::: . — I ffff •f••fJJ_!}_fJIJ+iYfffffff if el • I fffffffff• II t D ff• 26 40 60 S0 f f f f f100 120 1 0 I f.f I I I ffff -10.000 ! - f f — f I I -24000 I I Duration(Minutes) UCFOD DETENTION BASIN VOLUME ESTIMATING'WORKBOOK Version 2.3,Released March 2012 LC.Ce:ersen_c2 I_EX,37 NG;I-E.%boes ca> M. 1 2 3 4 5 6 7 8 DAT, „, , ,,, WI. AEU IlDi2-1X,i n 7T a ,l 7T ��I ul 1� Itl p IV -ITELI. �ai ,III f �� FIpkw '��_ w ]�II � I � %� Ha' � I,I 111Al „a RM. LOT B OF RECORDED EXEMPTION NO, 1057-23-2—REC X1 1-0056, BEING A PART OF THE W 1/2 OF SECTION 23, A TOWNSHIP 4 NORTH, RANGE 66 WEST, OF THE 6TH P.M., COUNTY OF WELD, STATE OF COLORADO. A NORTHWEST SECTION CORNER SECTION 27, TOWNSHIP 4 NORTH ONE-OOARTER CORNER NORTH, RANGE OF WEST. SECTION 23, TOWNSHIP 4 U / NORTH, RANGE EST. 7.7 I 14.3' •1 1142. WeloCOUNTY ROAD 44 14 co, tn Oe X23 513 — cu 23 00 Op , I ( ay O 6361 ra4 V) /- _-t lad 20 1. C 1 _ E CR 44 6 I NCsf0R5 MU R:U.DITCH 6--j-0�- �6 I In°1 '^n" W O cpN 6 1 �93 i1 —_).�_ 13090 _ �3oo a4 _ �...___ 41_as_ _=-.=g-- 6 I 5'a sw - 5'C L6 I LOT B b1J yc /� - a A I3/[5 '..;.• /44 C rc� �',. �A„ LOI8 3/ Ior _"t LOT d co w f` �/ 144 ACRES+ 1lr. S 139__ , 4-22? ��0 V Ct K � J 0 nv¢. / CII rn 1AL �, 1 o 2 w J � � - iw.i GAS wmi % / Sao V1/ i LOT r O `I Rwj O / 61 /) p [�` OASWELL ON rT U / C v /AN e Ire M /,, T7�VR_ 1O14 461as'-N / / 4 VICINITY MAP SCALE = 1" TO 2000' 77 _C / �ATTE2�, T a 143 ACRES i q, Z W IANK I / 6A IlRY WT6 bA9 A9f012 / / 611 5µ' , I ( 7colcimi•J CurveTable u7; -�� / `, I I / Cnrvc- Length Radius Delta Bearing Chord _/ 7 [24185' 000 \/� 1 I ( /'�{\Vs C I 62.729' 40 24' ! 1 ! ( 56.57' // 70-FOOT ACCESS AND 434 15'—\\ j / \ C2 62.x32' 40.00' J 1 J 56.57 / UTILITY EASEMENT FOR / /7/ /� THE BENEFIT OF LOT A / \�B I �``n C3 267.724' 1218.05' J 1 J ( 267.19' 41D LIT R IF IS ' °', I C4 267.661' 1236.00' J 1 J ( 267.141� 0N8 //( , I — / / 6 IC5 850.802' 1200.00' J 1 J ( 833.0918 18' I0693'LOT AOFMINORS'HI 0A'956 LL — NW INC!I.M)IN 18.2 ACRES SI HMV ISION /7 r m C6 304.075' 1236.00' 1 1 1 ( 303.31' 182 ACRES- / "I. In 179, _ .� f N C7 298.935' 1217.93' J 1 J ( 298.19' 91n 33 CO N m j1 No C8 306.628' 1_36.00' J 1 J ( 305.84' w w LD 1 1 I ( - I L C9 97.9 0 17.y 1 97.18' • � w - , I C .-, LS " 6 I 4�9'�1 X581-2 TI�43 � c10 340.x15 436.00' ! 1 ! ( 33220' C L1 Z [F-- '" i1 -NNL a ur oo _ c9 O T ,7 A 1 I I 58143 1E cAs„.,„ J� C11 327.037' 418.00' / 6 J : 318.76' I I— '= Ll y LIT c31'4� wr4/ O C12 r c 0 0 �' E "5'' 313.253' 400.00' J 1 J ( 305.31' , — w EXISTING ACCESS s nCREs+ w L z - PERMIT NO. P1 (1005 �, �� C13 61647' 40.00' J 1 J 55.72' fTl L�1 l— _A. I n C 14 62.734' 40.00 I 6 1 56.50' T f'1 I d w I� o T ,„ GAS Wnu \� r,� r Lv - I L/ Li , ENTER ONE—QUARTER CORNER h+l 0 '2- LOT 1 I U12 ,� LID H I SECTION T/ NCHIF 4 w / x.37 ACRES- al ACRES= 131.15 NORTH. RANGE rt, ',",'EST. C LEGEND: ra I �7} 1 FOUND SECTION COPNEP AS NOTED. O F�— — Z ET INE CII RTEF CORNER / m w /'1 n 'O _ LOTS f ii FOUND ONE OUAPTEP COPNEP AS H I--I UI U SECTION TOWNSHIP 4 oa vCRIS- \ NOTED. 2 NORTH RANGE 36 NEST �. FOUND OP SET COPNEP AS NOTED. W w 6 I " 17=1 H LC IGL43'� — —5D"'wl9' , I �., I; q oulwrB 3� FOUND 6,8 4P 1B" LONG WITH YELLOW I� �j I PLASTIC CAP STAMPED HAMMEP PLS M Lt N c _— T 1f10ILN ES+HON �.L( 6 NSK 24 �, co ^' srolervl DEIFNIIory POND��- �eArrnRc w m �^ sECllon LINE rl O FOUND PIN AND CAP LS 4392 > _ 6 I ( �( OIITIDTA TANKBATTERY �� SET 5T8 PEBAR l8" LONG WITH YELLOW w 40 ACRES? — = LL 18519' — PL STIC C NP STUMPED H-MMER PLS w N 24.0 O 34756' 6 r _ FCUND PIN AND v3 --n]7=1"" 0215' 6 I _ L5076 f - �6 r CAP PLS 4'92 aL w TUFT' El- Q FOUND PIN ANDS F I- ':TAP PLS 4382 w n /E SHEET: S 1 0 200 400 SCALE:1"-200'Pli -- 1 2 3 4 5 6 7 8 e S(TEDRA[NAG E Hello