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WSP03774
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Last modified
1/26/2010 12:52:04 PM
Creation date
10/11/2006 11:57:58 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8273.800.10
Description
Colorado River Basin Salinity Control - Federal Agencies - Joint Reports
Basin
Colorado Mainstem
Water Division
5
Date
12/1/1990
Title
1990 Joint Evaluation of Salinity Control Programs in the Colorado River Basin
Water Supply Pro - Doc Type
Report/Study
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<br />~ <br />W <br />(Jl <br />o <br /> <br />Program Effects <br /> <br />The plan of implementation will fully satisfy salt <br />load rsduction objectives and program goals. It <br />will maintain the average TDS at or below <br />879 mg/L at Imperial Dam based on long-term <br />mean water supply and the projected demands, <br />Figure 5 shows how the implementation plan <br />meets the numeric criterion at Imperial Dam in <br />2010. It shows the projected salinity at Imperial <br />Dam with and without further controls to the <br />year 2010. <br /> <br />Public Law 93.320 and its amendment requires <br />that a percentage of the Federal cost be repaid <br />from the Upper and Lower Basin water <br />development funds with revenue generated from <br />the sale of hydropower. Repayment analysis of <br />the Lower Colorado River Basin Fund prepared <br />for the 1990 water quality standards review and <br />this evaluation showed that sufficient funds are <br />available to cover all costs (capital, operation <br />and maintenance, and interest) of the <br />implementation plan. The repayment analyses <br />spreadsheets are included in appendix A. <br /> <br />1,000 <br /> <br />950 <br /> <br />Conclusions <br /> <br />The 1990 plan of implementation will fully <br />satisfy saIt load rsduction objectives and <br />program goals, maintaining flow weighted <br />average annual salinity levels at Imperial Dam <br />at or below 879 mg/L. The plan will remove a <br />total of 1.464 million tons of salt annually from <br />the Colorado River system by 2010. The <br />projected total remaining investment cost of the <br />1990 implementation plan will be approximately <br />$669 million. <br /> <br />Although high flows in the period 1983 to 1987 <br />temporarily lowered salinity levels in the <br />system, salinity levels are currently rising, <br /> <br />Repayment analysis of the Lower Colorado River <br />Basin Fund prepared for this evaluation showed <br />that sufficient funds are available to cover all <br />costs (capital, O&M. and interest) of the <br />implementation plan, The LCRBD Fund can <br />repay its share of the costs with an inflation rate <br />of only 2.9 percent, which further emphasizes <br />the need to complete the implementation plan as <br />early as possible, <br /> <br /> <br />900 <br /> <br />Without salin~y program -- <br /> <br />~ <br />'" <br />E <br />~ <br />,~ <br />,5 <br />n; <br />" <br />'i <br />:c <br />'" <br />'(ii <br />" <br />J: <br />o <br />u: <br /> <br />Numeric crlterlon-a79 mgll '- <br />-------------- <br /> <br />800 <br /> <br /> <br />. <br /> <br />860 <br /> <br />750 <br /> <br />700 <br />1990 <br /> <br />1995 <br /> <br />- - - - - - - - - ~.- - - - - - <br />. '. . <br />. . <br /> <br />.... I... <br /> <br />. . <br /> <br />.. / <br />With salinity program <br /> <br />2000 <br />Years <br /> <br />2005 <br /> <br />2010 <br /> <br />Figure 5.-Salinity projections at Imperial Dam, <br /> <br />9 <br />
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