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WSP09501
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Last modified
1/26/2010 2:54:05 PM
Creation date
10/12/2006 3:40:02 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8276.400
Description
McElmo Creek Unit - Colorado River Salinity Control Program
State
CO
Basin
Colorado Mainstem
Water Division
7
Date
6/1/1983
Title
Salinity Control by Canal Lining: The McElmo Creek Unit/ Colorado
Water Supply Pro - Doc Type
Project Overview
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<br />. <br /> <br />. <br /> <br />PLAN CONCEPT AND ACCOHPLISHMENTS <br /> <br />. <br /> <br />The most cost effective plan, refered to as the IIline and combine" <br />plan, proposes to line sections of distribution canals within the MYI <br />irrigation system, and to combine two canals into one. The sections to <br />be lined are located On the Lone Pine and Upper Hermana Laterals, and <br />the Rocky Ford Ditch would be combined into an enlarged and lined High- <br />line Ditch where laterals would be included as part of the project fea- <br />tures to convey irrigation water from the Highline Ditch to irrigators <br />below the abandoned Rocky Ford Ditch. This plan would reduce salt <br />loading to McElmo Creek by eliminating seepage from the Highline and <br />Rocky Ford Ditches and from segments of the Lone pine and Upper Hermana <br />Laterals. Deep percolation through saline soils of water seeping from <br />sections of these and other canals appears to be one of several <br />identifiable mechanisms of salt loading to McElmo Creek. <br />The area soils are responsible for the majority of salt loaded into <br />the drainage system as a result of groundwater return flow. There are <br />two main types of soils in the area: a gray, colluvial soil derived <br />from Mancos Shale; and, a red aeolian soil derived from Dakota <br />Sandstone. The gray soil, covering ~approximately 40 percent of the <br />area, contributes the most to salinity since it was formed from marine <br />deposited materials. The red soil is relatively free from toxic accu- <br />mulations of soluble salts or excessive alkalinity and covers the re- <br />maining 60 percent of the area. Canals, laterals, and ditches <br />criss-crossing the irrigated portions of the unit area, combined with <br />flood irrigation, contribute to groundwater recharge. Return flows en- <br />tering the McElmo Creek Drainage pick up soluble salts contained in the <br />gray soils. <br />Calculations made on canal seepage consider the future operation of <br />the Dolores Project, a Reclamation water resource project currently un- <br />der construction which will provide storage and additional irrigation <br />water for the MYI. The MYI presently diverts water directly from the <br />Dolores River and will begin to draw water from McPhee Reservoir, a <br />Dolores Project feature, when the project nears completion in 1989. <br />Estimated seepage through MYI canals within McElmo Creek drainage <br />averages 12,000 acre-feet (14,796,000 cubic meters) of water a year and <br />contributes an estimated 39,600 tons (35,900 metric tons) of salt annu- <br />ally to McElmo Creek. These figures may vary by +/- 20 percent. The <br />degree of accuracy results from using a range of expected values for <br />canal seepage rates. Seepage losses resulting from lined canal sec- <br />tions could be reduced by an average of 50 percent annually, approxi- <br />mately 6,000 acre-feet (7,398,000 cubic meters) reducing salt loading <br />by approximately 24,000 tons (21,800 metric tons). This corresponds to <br />a reduction in salinity concentration of approximatey 2.6 mg/L at Impe- <br />rial DaIL. <br />The total project construction cost, less investigative expenses, <br />is estimated at $20,133,00 based on January 1982 prices. The total <br />construction cost includes $17,093,000 for canal lining and $3,040,000 <br />for a pipe distribution svstem to convey irrigation water from the <br />Highline Ditch t~ the Rocky Ford service area. Project cost estimates <br />are shown on the next page. <br />The life of this plan is designed for 50 years service and determi- <br />nation of an annual cost is based upon an interest rate of 8.125 <br />percent, a rate used for estimating federal water resource projects '~~-~l~GO <br />of October 1982. Interest accruing during contruction is also inclddeu, V <br /> <br />3 <br /> <br />Roche and Davison <br />
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