Decision Support Systems
4/17/2013 9:36:20 AM
6/11/2008 2:20:57 PM
Decision Support Systems
SPDSS Task 64 - Review and Develop Precipitation Recharge Estimates
This memorandum presents the general approach used to develop monthly precipitation recharge estimates for both the Denver Basin and South Platte alluvial ground water models.
Decision Support - Doc Type
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Leonard Rice Engineering
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SPDSS Memorandum <br />Final <br />To: Ray Alvarado and Ray Bennett <br />From: LRE -Erin Wilson, Beorn Courtney, and James Heath <br />Subject: Task 64 -Review and Develop Precipitation Recharge Estimates <br />Date: May 11, 2007 <br />Introduction <br />Average annual precipitation varies across the South Platte River basin from 30 inches or more <br />along the Continental Divide down to 7 to 15 inches across the plains east of Denver and in the <br />South Park area in the southwest part of the basin. Total precipitation can be consumed by <br />irrigated and native vegetation, captured in surface water storage and then evaporated, held in <br />soil zone storage, produce surface water runoff to local drainages, or recharge the aquifer (i.e. <br />deep percolation). Precipitation recharge to the aquifers is an inflow component to the Denver <br />Basin and South Platte Alluvial ground water models (Figure 1). It is important that <br />precipitation recharge estimates are reasonable and consistent with estimates of other uses of <br />precipitation considered in the model. <br />This memorandum presents the general approach for Task 64: <br />1. Review published information for the basin and western United States on precipitation <br />recharge to ground water aquifers. <br />2. Recommend an approach to estimate precipitation recharge that is reasonable and <br />consistent and integrated with other uses of precipitation (e.g. precipitation use by <br />irrigated crops, precipitation use by native species, etc.). <br />3. Develop monthly precipitation recharge estimates for both the Denver Basin and South <br />Platte alluvial ground water models for the SPDSS study period based on key climate <br />stations and their spatial distribution determined in Phase 1, Task 53. <br />Task 64.doc 1 of 13 <br />
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