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WSP08158
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Last modified
1/26/2010 2:30:22 PM
Creation date
10/12/2006 2:47:11 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8272.600.60
Description
Colorado River Basin Salinity Control Program - Basin Member State Info - Utah
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1991
Title
Colorado River Basin Rangeland Salinity Control Project - State of Utah
Water Supply Pro - Doc Type
Report/Study
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<br />6 <br /> <br />, <br /> <br />numerical rating in this evaluation. <br /> <br />o (5) The Salinity Map, State of Utah (SCS, March 1973) has peen. <br />N extensively utilized by the Bureau of Reclamation in their planning.i <br />~ efforts. Salinity was measured in mmhos/cm units and divided into <br />CJl four rating categories. Each watershed was giventheratine;,ofth'e <br />highest saline category that fell within its boundaries. The <br />numerical ratings were used as the rating points in the inventory , <br />as follows: <br /> <br />UNITS (mmhos/cm) <br /><4 mmhos/cm in the soil profile <br /><4 mmhos/cm above 8" soil depth and <br />4-16 mmhos/cm below 8" soil depth <br />4-16 mmhos/cm above 20"'soil depth and <br />>16 mmhos/cm below 20" soil depth <br />>16 mmhos/cm on surface and throughout <br />the soil profile. <br /> <br />(6) The map of the Estimated Sediment Yield Rates for. the State of, <br />utah (SCS, August 1973) was made using thePSIAC, 1968, Sediment <br />Yield Procedure. The numerical PSIAC ratings have one as t~e <br />highest yield and six as the lowest. For the purposes of this <br />evaluation that rating system was modified by reversing the .rating <br />order so that the highestsediment'yield reflected the highest <br />rating value. The sediment yield rating unit is. acre-feet per <br />square mile. This unit can be appro~imately converted to tQnsper <br />acre by multiplying the acre-feet per square mile by a factor of <br />three. Each watershed was given a rating of the highest sediment <br />yield category that fell within the watershlild.The following <br />rating categories were used in the evaluation: <br /> <br />RATING <br />o --- <br />1 ---' <br /> <br />CATEGORY <br />Nonsaline --------- <br />Slightly Saline --- <br /> <br />2 <br /> <br />Moderately Saline - <br /> <br />3 <br /> <br />Strongly Saline --- <br /> <br />RATING EROSION CATEGORY UNITS (acre..feet/sq. mL} <br />1 ----- Low --~---------------- <0.2 <br />2--~-_ Moderate. -------------- 0.2_0.5 <br />3 ----- Moderately High ------- 0.5-1.0 <br />4 -----High-------_---------- 1.0-3.0 <br />5 ----- Very High ------------- >3.0 <br /> <br />(7) The Normal Annual Precipitation, 1931-1960, Map of Utah (US <br />Weather Bureau, 1960) was used to rate the precipitation ranges <br />that occur within the watershed. This parameter can be used.to <br />evaluate the availability of precipitation over the watershed for <br />purposes.. of planning vegetative treatments for rangeland <br />rehabilitation. The greater the precipitation, the greater the <br />potential for successful vegetative treatments. The map contains <br />isolines in inches of annual precipitation. The range of . <br />precipitation within the watershed area was recorded. A value of <br />less than eight inches of annual precipitation was determined by <br />the Steering Committee to be the lower limit below which veg~tative <br />treatment is impractical. It should be noted that even within 8" <br />to 12" of annual precipitation there is a relatively high risk of <br />failure of vegetative practices. There are mechanical practices <br />that could successfully control overland flow on rangeland with 8" <br /> <br />J <br />:i <br />,'-1 <br /> <br />. .1.. <br /> <br />".' ,'- ", 4.. ~ _ ,_~,.;i.."'';; :..>_ <br /> <br />.i&,k""~i~i,~.,, <br />
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