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C150194 feasiibility study
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C150194 feasiibility study
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Last modified
3/11/2011 3:11:07 PM
Creation date
7/23/2010 12:28:40 PM
Metadata
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Template:
Loan Projects
Contract/PO #
C150194
Contractor Name
Central Colorado Water Conservancy District
Contract Type
Loan
Water District
2
County
Adams
Morgan
Weld
Bill Number
SB 05-084
Loan Projects - Doc Type
Feasibility Study
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commencement of well puraping in 1974 through March of 2005. <br />Central's WAS service area is divided into six administrarive reaches (see Figure 1) for the <br />purpose of providing replacement supplies nearest �e points of actual depletion. The SDF <br />analysis is used for those reaches adjacent to the South Platte River (Reach A- Wiggins, Reach <br />B- Kersey, Reach C- Gilcrest, and Reach F- Brighton). As described at the beginning of <br />Section 3.2, the SDF for each well was used to lag monthly onsite alluvial ground water <br />depletions estimated by the conswnptive use model to the river. Reach D(Beebe Draw) and <br />Reach E(Box Elder Creek) aze tributaries to the South Platte River. Depletions to the South <br />Platte River from well pumping in these tributary basins aze assumed to occur at a constant <br />annual rate of 14 percent as approved by the State Engineer in 2UO3; the SDF analysis is not used <br />for these reaches. Leonard Rice Engineers is currently performing a more detailed analysis to <br />deternune the depletions from member wells in the Beebe Draw and Box Elder Creek reaches <br />which is anticipated to be completed by November 2004. <br />Each farm model unit was assigned an SDF value based on the centroid of the parcel. It was <br />assumed that all parcels having an SDF value of 120 days or less would have a surface retuzn <br />flow compon�t for the alluvial ground water applied to the farm. If the farm model unit has an <br />SDF value greater than 120 days, all return flows were assumed to be ground water return flows. <br />The swface return compone�t was assumed to be 40 percent of the retum flows, with the <br />remaining 60 percent going to deep percolation. The surface retum flow component attributed to <br />the alluvial ground water pumping was assumed to return to the river the same month it was <br />wi�drawn (i.e. SDF = 0). The subsurface (i.e. deep percolation) rehun flow component of <br />alluvial ground water for all farm model units was lagged back to the river using the SDF of the <br />farm model unit. <br />The consumptive use model (IDSCin estimated the onsite atluvial ground water consump�ive <br />use for each farm model unit for the period 1974 - 2004. The 1974 - 2004 well pumping, alluvial <br />surface water return compone�t and subsurface water return component (calculated as previously <br />discussed) were imported into the SDFView model to simulate net river depletions, by reach, <br />since 1974. It was decided to use 1974 as the commencement of well depletion calculations <br />be�ause all of the Water District 1 and Water District 64 decreed augmentaiion plans <br />commenced well depletions in 1974. <br />3.2.2 Depletion Analysis in Boa Elder and Beebe Draw Basins. Stream depletions to <br />the South Platte River from Box Elder and Beebe Seep were estimat� using a preliminary basin <br />water balance for Box Elder Creek and a representative basin SDF value in the 2003 SWSP. <br />Given the location of Central's member wells, the centroid of these wells was located and an <br />SDF value for the cetrtroid was assigned to all wells. The SDF assigned to Central's member <br />wells in Box Elder is estimated to be 220,640 days. Similarly, the SDF assigned to Beebe Seep <br />for Central's member wells is 71,374 days. Appendix B contains a summary of the SDF <br />estimates for each basin, as calcutated by Leaf Engineering. <br />The 2002 estimated onsite alluvial ground water depletions for each basin were lagged using an <br />estimated SDF for each basin, with depletions beginning in 1974. The 2002 depletions for each <br />basin were 0.11 percent of the estimated total aanua12002 ground watsr consumptive use in the <br />P:\Data\GEN\CCWCD�25087\SWSP WAS\ZW4 WAS SWSP (FINAL).doc '] <br />
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