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Last modified
4/17/2013 9:30:54 AM
Creation date
5/27/2008 10:58:32 AM
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Decision Support Systems
Title
SPDSS Task 56 - Conveyance and Application Efficiencies
Description
This memorandum describes the approach and results obtained under Task 56 - Conveyance and Application Efficiencies. This task includes an estimation of both ditch system conveyance and maximum application (on-farm) efficiencies likely to be experienced in the South Platte basin, plus a recommendation on efficiencies to use for the historic consumptive use analyses.
Decision Support - Doc Type
Task Memorandum
Date
4/22/2008
DSS Category
Consumptive Use
DSS
South Platte
Basin
South Platte
Contract/PO #
C153954
Grant Type
Non-Reimbursable
Bill Number
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Prepared By
Leonard Rice Engineering
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• Estimating average available soil moisture content (AWC) and soil type based on <br />permeability to represent each main canal from the soil AWC and soil <br />permeability <br />Conveyance loss information from the user interviews, published reports, and/or <br />summaries of water rights decrees <br />• Corresponding main canal lengths from user interviews or the GIS canal <br />coverage developed for the SPDSS project <br />• Corresponding canal capacities from user interviews or HydroBase (v. <br />20051115) <br />Results -Conveyance Efficiencies <br />Conveyance loss information for the 19 structures identified is shown in Table B-1. The <br />table includes structures with information gathered from user interviews, HydroBase, and <br />SPDSS GIS river and canal coverage. In some cases, the contact for the ditch company <br />was able to indicate a percentage of flow loss experienced along the main canal, portions <br />of the main canal, or throughout the ditch system. The loss data and other information <br />related to ditch system operations is included in the memoranda developed as part of the <br />SPDSS Task 5. <br />The lengths of the main canals in Table B-1 were either provided by the ditch company <br />or were extracted from the SPDSS GIS river and canal coverage, with preference given to <br />the GIS coverage. Canal lengths provided in the Key Structure Operating Memoranda <br />were verified from the SPDSS GIS canal coverage, which was primarily developed from <br />USGS maps. Main canal capacities are those provided by ditch companies or the <br />maximum daily diversions reported in HydroBase. The percent conveyance loss per mile <br />is the quotient of the estimated conveyance loss and the main canal length. <br />The average soil available water content beneath the main canal was determined from the <br />SPDSS Soil AWC GIS mapping, which was developed from STATSGO data obtained <br />from the MRCS. Canals in the South Platte basin are believed to flow through the lower <br />soil layer. Permeability for the layer beneath the main canal was determined from the <br />SPDSS Soil Permeability GIS mapping also developed from STATSGO. <br />Page B2 of B9 <br />
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