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Home My WebLink About20081393.tiff - r Southern Part III 0 Local Roads and Streets—We . Colorado. Sout a Y (Richard Stalcup) r I dillibmi! - _ _ ______. ___ _ _ _ III i—ign, nab,. Impr . , . 1 1 I ._ _ . si, O O co ____ , .. CO • . • 1t - , "ill.-- , 41 tabbies' Meters X N a 20 4r $0 120 a Feet Z 0 50 100 200 300 44 USA Natural Resources Web Soil Survey 2.0 12/3/2007 AO Conservation Service National Cooperative Soil Survey Page 1 of 4 • • Local Roads and Streets—Weld County. Colorado. Southern Part (Richard Stalcup) MAP LEGEND MAP INFORMATION Area of Interest(AO') Original soil survey map sheets were prepared at publication scale. Area of Interest(AOI) Viewing scale and printing scale. however, may vary from the original. Please rely on the bar scale on each map sheet for proper Soils map measurements. Soil Map Units Source of Map: Natural Resources Conservation Service Soil Ratings Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov F-J Very limited Coordinate System: UTM Zone 13N n Somewhat limited This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Not limited Soil Survey Area: Weld County. Colorado. Southern Part Not rated or not available Survey Area Data: Version 7. Jan 10. 2007 Political Features Date(s) aerial images were photographed: 1999 Municipalities O Cities The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background n Urban Areas imagery displayed on these maps. As a result, some minor shifting Water Features of map unit boundaries may be evident. Oceans Streams and Canals Transportation -_� Rails Roads Interstate Highways US Routes 41, State Highways Local Roads Other Roads t sffA Natural Resources Web Soil Survey 2.0 12/3/2007 Conservation Service National Cooperative Soil Survey Page 2 of 4 • • • Physical Soil Properties—Weld County,Colorado,Southern Part Richard Stalcup • Physical Soil Properties This table shows estimates of some physical characteristics and features that affect soil behavior. These estimates are given for the layers of each soil in the survey area.The estimates are based on field observations and on test data for these and similar soils. Depth to the upper and lower boundaries of each layer is indicated. Particle size is the effective diameter of a soil particle as measured by sedimentation, sieving, or micrometric methods. Particle sizes are expressed as classes with specific effective diameter class limits. The broad classes are sand, silt, and clay, ranging from the larger to the smaller. Sand as a soil separate consists of mineral soil particles that are 0.05 millimeter to 2 millimeters in diameter. In this table,the estimated sand content of each soil layer is given as a percentage, by weight,of the soil material that is less than 2 millimeters in diameter. Silt as a soil separate consists of mineral soil particles that are 0.002 to 0.05 millimeter in diameter. In this table, the estimated silt content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 millimeters in diameter. Clay as a soil separate consists of mineral soil particles that are less than 0.002 millimeter in diameter. In this table,the estimated clay content of each soil layer is given as a percentage, by weight, of the soil material that is less than 2 millimeters • in diameter. The content of sand, silt, and clay affects the physical behavior of a soil. Particle size is important for engineering and agronomic interpretations, for determination of soil hydrologic qualities, and for soil classification. The amount and kind of clay affect the fertility and physical condition of the soil and the ability of the soil to adsorb cations and to retain moisture.They influence shrink- swell potential, saturated hydraulic conductivity (Ksat), plasticity, the ease of soil dispersion, and other soil properties. The amount and kind of clay in a soil also affect tillage and earthmoving operations. Moist bulk density is the weight of soil (ovendry) per unit volume. Volume is measured when the soil is at field moisture capacity, that is, the moisture content at 1/3- or 1/10-bar(33kPa or 10kPa) moisture tension. Weight is determined after the soil is dried at 105 degrees C. In the table, the estimated moist bulk density of each soil horizon is expressed in grams per cubic centimeter of soil material that is less than 2 millimeters in diameter. Bulk density data are used to compute linear extensibility, shrink-swell potential, available water capacity, total pore space, and other soil properties. The moist bulk density of a soil indicates the pore space available for water and roots.Depending on soil texture,a bulk density of more than 1.4 can restrict water storage and root penetration. Moist bulk density is influenced by texture, kind of clay, content of organic matter, and soil structure. Saturated hydraulic conductivity(Ksat) refers to the ease with which pores in a saturated soil transmit water. The estimates in the table are expressed in terms of micrometers per second. They are based on soil characteristics observed in the field, particularly structure, porosity, and texture. Saturated hydraulic conductivity (Ksat) is considered in the design of soil drainage systems and septic tank • absorption fields. USDA Natural Resources Web Soil Survey 2.0 12/3/2007 Conservation Service National Cooperative Soil Survey Page 1 of 4 Physical Soil Properties—Weld County,Colorado,Southern Part Richard Stalcup • Available water capacity refers to the quantity of water that the soil is capable of storing for use by plants. The capacity for water storage is given in inches of water per inch of soil for each soil layer.The capacity varies,depending on soil properties that affect retention of water. The most important properties are the content of organic matter,soil texture,bulk density,and soil structure.Available water capacity is an important factor in the choice of plants or crops to be grown and in the design and management of irrigation systems.Available water capacity is not an estimate of the quantity of water actually available to plants at any given time. Linear extensibility refers to the change in length of an unconfined clod as moisture content is decreased from a moist to a dry state. It is an expression of the volume change between the water content of the clod at 1/3-or 1/10-bar tension(33kPa or 10kPa tension) and oven dryness. The volume change is reported in the table as percent change for the whole soil. The amount and type of clay minerals in the soil influence volume change. Linear extensibility is used to determine the shrink-swell potential of soils. The shrink-swell potential is low if the soil has a linear extensibility of less than 3 percent; moderate if 3 to 6 percent;high if 6 to 9 percent;and very high if more than 9 percent. If the linear extensibility is more than 3, shrinking and swelling can cause damage to buildings, roads, and other structures and to plant roots. Special design commonly is needed. • Organic matter is the plant and animal residue in the soil at various stages of decomposition. In this table, the estimated content of organic matter is expressed as a percentage, by weight, of the soil material that is less than 2 millimeters in diameter. The content of organic matter in a soil can be maintained by returning • crop residue to the soil. Organic matter has a positive effect on available water capacity, water infiltration, soil organism activity,and tilth. It is a source of nitrogen and other nutrients for crops and soil organisms. Erosion factors are shown in the table as the K factor(Kw and Kf)and the T factor. Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by water.Factor K is one of six factors used in the Universal Soil Loss Equation(USLE) and the Revised Universal Soil Loss Equation (RUSLE)to predict the average annual rate of soil loss by sheet and rill erosion in tons per acre per year. The estimates are based primarily on percentage of silt, sand, and organic matter and on soil structure and Ksat.Values of K range from 0.02 to 0.69. Other factors being equal,the higher the value,the more susceptible the soil is to sheet and rill erosion by water. Erosion factor Kw indicates the erodibility of the whole soil. The estimates are modified by the presence of rock fragments. Erosion factor Kf indicates the erodibility of the fine-earth fraction, or the material less than 2 millimeters in size. Erosion factor T is an estimate of the maximum average annual rate of soil erosion by wind and/or water that can occur without affecting crop productivity over a sustained period. The rate is in tons per acre per year. Wind erodibility groups are made up of soils that have similar properties affecting their susceptibility to wind erosion in cultivated areas. The soils assigned to group 1 are the most susceptible to wind erosion, and those assigned to group 8 are the least susceptible. The groups are described in the "National Soil Survey • Handbook." USDA Natural Resources Web Soil Survey 2.0 12/3/2007 Sit Conservation Service National Cooperative Soil Survey Page 2 of 4 • • Physical Soil Properties—Weld County,Colorado,Southern Part Richard Stalcup • Wind erodibility index is a numerical value indicating the susceptibility of soil to wind erosion,or the tons per acre per year that can be expected to be lost to wind erosion. There is a close correlation between wind erosion and the texture of the surface layer, the size and durability of surface clods, rock fragments, organic matter, and a calcareous reaction. Soil moisture and frozen soil layers also influence wind erosion. Reference: United States Department of Agriculture,Natural Resources Conservation Service. National soil survey handbook, title 430-VI. (http://soils.usda.gov) • • USDA Natural Resources Web Soil Survey 2.0 1213)2007 Conservation Service National Cooperative Soil Survey Page 3 of 4 • • Local Roads and Streets—Weld County,Colorado,Southern Part Richard Stalcup • Local Roads and Streets Local Roads and Streets—Summary by Map Unit—Weld County,Colorado,Southern Part Map unit symbol Map unit name Rating Component Rating reasons Acres in AOI Percent of name(percent) (rating values) AOI 72 Vona loamy sand, Not limited Vona(85%) 4.1 100.0% 0 to 3 percent slopes Totals for Area of Interest(AOI) 4.1 J 100.0%J Local Roads and Streets—Summary by Rating Value Rating Acres In AOI Percent of AOI Not limited 4.1 100.0% Description Local roads and streets have an all-weather surface and carry automobile and light truck traffic all year.They have a subgrade of cut or fill soil material;a base of gravel, crushed rock, or soil material stabilized by lime or cement; and a surface of flexible material(asphalt), rigid material(concrete), or gravel with a binder.The ratings are • based on the soil properties that affect the ease of excavation and grading and the traffic-supporting capacity. The properties that affect the ease of excavation and grading are depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan, depth to a water table, ponding, flooding, the amount of large stones, and slope. The properties that affect the traffic-supporting capacity are soil strength (as inferred from the AASHTO group index number), subsidence, linear extensibility (shrink-swell potential), the potential for frost action, depth to a water table, and ponding. The ratings are both verbal and numerical. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect the specified use. "Not limited" indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. "Somewhat limited" indicates that the soil has features that are moderately favorable for the specified use. The limitations can be overcome or minimized by special planning, design, or installation. Fair performance and moderate maintenance can be expected."Very limited"indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation, special design, or expensive installation procedures. Poor performance and high maintenance can be expected. Numerical ratings indicate the severity of individual limitations. The ratings are shown as decimal fractions ranging from 0.01 to 1.00. They indicate gradations between the point at which a soil feature has the greatest negative impact on the use (1.00) and the point at which the soil feature is not a limitation (0.00). • USDA Natural Resources Web Soil Survey 2.0 12/3/2007 = Conservation Service National Cooperative Soil Survey Page 3 of 4 • • r Physical Soil Properties—Weld County,Colorado,Southern Part Richard Stalcup Report—Physical Soil Properties Physical Soil Properties—Weld County,Colorado,Southern Part Map symbol Depth Sand Silt Clay Moist Saturated Available Linear Organic Erosion factors Wind Wind and soil name bulk hydraulic water extensibility matter erodibility erodibliity density conductivity capacity Kw Kf I group index In Pct Pct Pct g/cc micro m/sec In/In Pct Pct • 72—Vona loamy sand,0 to 3 percent slopes Vona ;0-6 - - !3-8 1.45-1.60 42.00-141.00 0.06-0.08 0.0-2.9 0.5-1.0 .20 1.20 5 2 i 134 I •6-28 - - 8-18 1.40-1.50 14.11-42.33 0.12-0.14 0.0-2.9 0.5-1.0 .28 i.28 28-60 .- 3-15 1.45-1.55 14.00-141.00 0.06-0.13 0.0-2.9 0.0-0.5 .32 .32 Data Source Information Soil Survey Area' Weld County, Colorado, Southern Part Survey Area Data: Version 7, Jan 10. 2007 ill USDA Natural Resources Web Soil Survey 2.0 12/3/2007 aim Conservation Service National Cooperative Soil Survey Page 4 of 4 • • • Local Roads and Streets—Weld County,Colorado,Southern Part Richard Stalcup • Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher • • USDA Natural Resources Web Soil Survey 2.0 12/3/2007 Conservation Service National Cooperative Soil Survey Page 4 of 4 Hello