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WSP09723
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Last modified
1/26/2010 2:55:26 PM
Creation date
10/12/2006 3:52:12 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8271.300
Description
Colorado River Basin Salinity Control Program - General Information and Publications-Reports
Basin
Colorado Mainstem
Water Division
5
Date
1/1/1993
Title
Greater Sagers Wash Watershed Management Plan
Water Supply Pro - Doc Type
Report/Study
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<br />The sandstone/highlands geomorphic unit was judged to also be SATISFACTORY in condition, <br />but it was borderline between low and high vulnerability, i.e. it had a medium likelihood of <br />slipping back into an unsatisfactory condition. The coarse rock fragments and rock outcroppings <br />are partly responsible for a higher degree of vulnerability in this unit. <br /> <br />C> <br />C> <br />~ <br />.r;.. <br /> <br />All the other four geomorphic units are in the category of UNSATISFACTORY, LOW <br />RESPONSIVENESS. They each have limited ability to respond to improvement efforts. These <br />units are of limited potential to support increased vegetational cover (as little as 5-8 inches <br />annual precipitation) and show very high rates of geologic erosion. Each of these units produces <br />significant salt yields, especially the shale plains and shale pediments. Table A-2.0, soil erosion, <br />sediment, and salt predictions by soil taxonomic unit for existing conditions and selected <br />treatments, shows a range of about 0.0002 tons of salt per acre to around 0.35 tons of salt per <br />acre/year. <br /> <br />In summary, how do the selective management categories produced by the Team's watershed <br />condition analysis correlate with Treatment Area recommendations? TItis question gets at the <br />value of classifying watersheds by this technique and provides a test as to the validity of <br />Treatment Areas. <br /> <br />I. The sandstone/higWands geomorphic unit, judged satisfactory in condition, was not <br />chosen for treatment. Other factors important in the non-treatment of this unit were the <br />key role of coarse fragment amounts, and the lower levels of soil salinity. <br /> <br />2. The mountain sides/mountain benches unit has a few small, isolated and inaccessible sage <br />park and PI stands. Most of the area is wilderness study area. No treatments were <br />recommended, primarily because of poor access. The rating chart should show this unit <br />rated in satisfactory condition, and higWy vulnerable. Soil salinities are generally low. <br /> <br />3, In the structural benches geomorphic unit, sagebrush chopping (T A -I) and pinion-juniper <br />chaining (TA-2) are considered as vegetative manipulations on the smootWy sloping <br />benches. Vegetative manipulation of sage and pinion sites is the key to maintaining a <br />satisfactory watershed condition. The interspaces in the Wyoming sage on the Barx soil <br />taxonomic unit, and the condition of the soil surface under the pinion-juniper stands <br />underscore this, <br /> <br />4. The balance of the acreage in the watershed, including the remaining three geomorphic <br />units, is rated UNSATISFACTORY and LOW RESPONSIVENESS (ULR). The <br />Treatment Areas TA-3 through 12 occur in these geomorphic units, which are the alluvial <br />valleys, shale plains/pediments, and shale pediments/badlands, By definition, the ULR <br />category lands are in unsatisfactory condition and are judged to have limited ability to <br />respond to improvement efforts. It is true that some of the TA's have limited potential <br />to support vegetational cover, especially TA 5-10. As the section on Treatment Areas <br /> <br />32 <br />
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