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SPDSS_Task46-2_StreamGainLossEstimates
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Last modified
4/17/2013 9:26:27 AM
Creation date
6/11/2008 1:49:45 PM
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Decision Support Systems
Title
SPDSS Task 46.2 - Stream Gain/Loss Estimates - Phase 4
Description
This Technical Memorandum summarizes the compilation and analysis of data for the computation of monthly gains and losses for the main stem of the South Platte River and selected tributaries for the study period of 1950-2005.
Decision Support - Doc Type
Task Memorandum
Date
4/10/2008
DSS Category
Groundwater
DSS
South Platte
Basin
South Platte
Contract/PO #
C153953
Grant Type
Non-Reimbursable
Bill Number
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Prepared By
CDM
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compiling surface water data on the daily inflows and outflows for specified river or stream <br />reaches, and then applying a set of steps to convert the daily flows into estimates of monthly <br />gains or losses between the surface water system and the hydrologically-connected aquifer <br />system. The gain/loss results, referred to as baseflow, are an important part of the water <br />balance of flee South Platte River system. The baseflow results will be used >ln helping <br />calibration the alluvial groundwater flow model being developed under Task 48. <br />The following table summarizes the sections contained in finis TM. <br />Section Descri tion <br />1.0 Investigation Area and Data Collection <br />1.1 Areas of Investi ation <br />12 Data Collection <br />2.0 Methodolo <br />2.1 Mass Balance Determination <br />2.2 Short-Term AveraQin~ <br />2.3 Constraint Determination <br />2.4 Lon -Term Avera~in~ <br />3.0 Results and Anal sis <br />4.0 Sunnmar and Conclusions <br />5.0 Reconmlendations <br />6.0 Peferences <br /> Appendices <br />A Mass Balance Components <br />B Command Files <br />C Monthl Mass Balance Approach <br />D Constraint Values <br />1.0 Investigation Area and Data Collection <br />Stream ga>ln or loss is def>lned in finis TM as the recharge from or discharge to the alluvial <br />aquifer that is in hydrologic conmlunication wifln the overlying stream system, respectively. <br />The flow un a stream that is due to groundwater discharge is commonly referred to as baseflow. <br />This task was initiated to complement sinnilar work performed recently (and not yet published) <br />by the United States Geological Survey (USGS) on a limited portion of the main stem of the <br />South Platte River from Denver to the Kersey gage near Greeley. The results of this task will be <br />used to help calibrate the alluvial groundwater model being developed under Task 48 by <br />cotnpar>ing the estimated gain/loss from this Task and fine model-simulated gauz/loss in a given <br />reach and time period. In addition, the results of this task will provide a useful addition to the <br />understanding of tlne Soutln Platte River surface water -groundwater system. <br />1.1 Areas of Investigation <br />Stream gain/loss estimates were determined for seven reaches along the South Platte P`iver and <br />two tributaries located withun tlne study area. Tlne reaches were defined using stream gages <br />SPDSS Phase 4 Task 46 Technical Memorandum -Final <br />0~4i 10i0~ <br />
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