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C150094 Phase I Report
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C150094 Phase I Report
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Last modified
6/12/2014 4:24:41 PM
Creation date
2/19/2014 3:15:23 PM
Metadata
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Template:
Loan Projects
Contract/PO #
C150094
Contractor Name
La Plata Water Conservancy District
Contract Type
Grant
County
La Plata
Loan Projects - Doc Type
Report
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Long Hollow Dam and Reservoir Phase I Summary Report <br /> stream gauges, including the Long Hollow and Cherry Creek gauges installed in 1988. Based on <br /> 85 years of record at the Hesperus gauge, the study period was about 5 percent drier than average <br /> (see Table 5). The average annual La Plata River discharge at the Hesperus gauge for the study <br /> period was 27,577 AF, which ranks at about the 45th percentile on a scale from dry to wet. Flow <br /> data from the five stream gauges and diversion records for 18 irrigation ditches were used to <br /> create the model and develop a water balance for the La Plata River and its tributaries (see Figure <br /> 5). After calibrating the model with actual data, the model was used to simulate stream <br /> conditions in Colorado during the study period with and without the proposed LHR. <br /> The model simulated the ability of the LHR to fill in-priority. The model supplied water to New <br /> Mexico in an amount equivalent to the historic Compact call from New Mexico during the study <br /> period. Figure 6 depicts the LHR end-of-month storage that is anticipated under this operation <br /> plan (WWE, March 2004). Based on historical Compact call conditions, LHR will fill 4 of 14 <br /> years, with an average fill of 3,540 AF/yr. LHR will release all or nearly all stored water in 10 of <br /> 14 years. <br /> The model also simulated the amount and timing of releases from LHR to deliver water to New <br /> Mexico at the Colorado-New Mexico State Line gauge, as required by the Compact, while <br /> allowing Colorado ditches on the La Plata River to divert in-priority by exchange without <br /> impacting Compact deliveries. A 300-AF Compact Reserve Pool in LHR was used to deliver <br /> water to New Mexico during the mid-summer low-flow period when the La Plata River in <br /> Colorado often must be administered as a split river. <br /> The incremental increase in diversions allowed by this exchange program benefits approximately <br /> 334 shareholders in the 18 ditches incorporated into the water allocation model (see Table 5). <br /> LPWCD irrigators have expressed support for allocation of the exchange water by priority. <br /> LPWCD will hire the necessary personnel to operate and maintain LHR. Records will be kept of <br /> LHR inflow, outflow (bypass amounts plus releases from storage), and remaining storage <br /> volumes for both the Compact Reserve Pool and the remaining storage. Releases from storage <br /> 991-077.115 Wright Water Engineers, Inc. Page 18 <br /> July 2004 <br />
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