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<br />"4" <br />;() <br />"..1 <br /> <br />...... <br />'-.-) <br /> <br />l,,:~:;> <br /> <br />2, Development of feasibility reports for <br />the identified watersheds. with the <br />purpose of eventual implementation of <br />control measures. <br />3, Implementation of salinity control <br />measures where feasible. <br />4, Collection of water quality data for the <br />purpose of monitoring the success of <br />land use plans, activity plans, and <br />watershed implementation structures. <br />BLM recently completed a draft report on <br />the Sin bad Valley Project The purpose of the <br />study was to review alternative methods for <br />the interception and disposal of saline <br />ground water in Salt Creek. which flows <br />through Sin bad Valley south of Gateway, <br />Colorado, <br />Before a preferred altemative can be <br />selected, additional hydrologic data. a <br />detailed deep well proposal evaluation. and <br />an environmental analysis are needed. The <br />present salt reduction estimate in mg/L is <br />based on only two years of record, Additional <br />discharge and conductivity measurements <br />are needed to define salt loads of high flows, <br />The two best altematives to date show that <br />with a .2 cis diversion. the salinity at Imperial <br />Dam could be reduced .7 mg/L with a cost <br />effectiveness of $719.000 to $765.000. <br /> <br />u.s. Geological Survey <br /> <br />In cooperation with State, local. and other <br />Federal agencies, the USGS-WRD (Water <br />Resources Division) operates about 780 <br />streamflow gaging stations in the Colorado <br />River Basin and collects water quality data at <br />about 280 of them, Information from the <br />stations constitutes a major water data base, <br />which is used in much of the Colorado River <br />Basin project pianning. management, and <br />operation. including the CRWQIP, <br />In addition. the USGS-WRD conducts <br />analytical and interpretative water resource <br />appraisalS describing the occurrence, <br />availability. and physical, chemical, and <br />biological characteristics of surface and <br />ground water. Studies range from evaluating <br />the impact and predictive changes in total <br />dissolved soiids expected from increased <br />coal and oil-shaie mining to regional aquifer <br />systems analysis in many sectors of the <br />Colorado River Basin. <br />Robert F, Middelburg, Jr., hydrologist with <br />the Water Resources Division in Denver is the <br /> <br /> <br />i\l <br />m <br />~ ~ . <br />!1l <br /> <br /> <br /> <br />USGS salinity control representative for <br />interagency coordination, <br /> <br />Construction cost is estimated at <br />$23,322,000, The improved irrigation water <br />management resuiting from the installation <br />of the sprinkler systems will reduce salt <br />loading in McElmo Creek by an estimated <br />38,000 tons per year. This is equivalent to a <br />3.9 mg/L reduction in salt concentration at <br />Imperial Dam. <br />Farmers installing the sprinkler systems <br />will realize annually about $S4 per acre from <br />increased crops yield and decreased farm <br />operating expenses. <br /> <br />McElmo Creek USDA Report <br /> <br />The USDA is completing a report covering <br />onfarm irrigation improvements in the <br />McElmo Creek Unit Colorado River Water <br />Quality Improvement Program, This report <br />recommends the installation of sprinkler <br />systems on 19,700 acres of land in the valley. <br />To serve these systems, 268 miles of <br />irrigation pipeline will be needed, <br />