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WSP11043
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Last modified
1/26/2010 3:15:49 PM
Creation date
10/12/2006 4:41:07 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8443.100
Description
Narrows Unit - Project Description
State
CO
Basin
South Platte
Water Division
1
Date
2/1/1978
Author
US DoI BoR
Title
SPECIAL REPORT Investigation of Review Issues Narrows Unit - Colorado Pick-Sloan Missouri Basin Program
Water Supply Pro - Doc Type
Report/Study
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<br />" A computer model was used to estima te the effects of the <br />proposed Narrows Reservoir on the alluvial aquifer adjacent to <br />the South Platte River near Fort Morgan, Colo. Changes in <br />ground-water discharge to the river caused by the proposed <br />reservoir were estimated assuming steady-state conditions. The <br />proposed reservoir was simulated for two different reservoir <br />pool altitudes. For the conditions simulated, the principal <br />effects of the proposed reservoir on the ground-water system <br />would be an increase in water table altitude in the aquifer and <br />a redistribution of ground-water discharge to the South Platte <br />River. <br /> <br />. <br /> <br />The proposed reservoir would cause water-level changes in <br />the aquifer between Fort Morgan and the proposed dam. The <br />change in water level at Fort Morgan was less than 1 foot <br />(0.3 meter) for the two reservoir conditions simulated. No <br />significant change in the ground-water system would occur <br />downstream from Fort Morgan. <br /> <br />Ground-water discharge to the South Platte River would be <br />decreased at the reservoir site and increased downstream from <br />the proposed reservoir. The model study indicates that <br />ground-water discharge would decrease by 24 cubic feet per <br />second (0.68 cubic meter per second) above the proposed dam <br />and increased by 24 cubic feet per second (0.68 cubic meter <br />per second) below the proposed dam for steady-state conditions <br />with the reservoir pool at 4,404 feet (1,342 meters). Ground- <br />water discharge would decrease by 11 cubic feet per second <br />(0.31 cubic meter per second) above the proposed dam and increase <br />by 15 cubic feet per second (0.42 cubic meter per second) below <br />the proposed dam for steady-state conditions with the reservoir <br />pool at 4,383 feet (1,336 meters)." <br /> <br />Status of "Transient" Analysis <br /> <br />A check with the Geological Survey on December 14, 1977, indicates <br />that they are about 50 percent completed with their area ground-water <br />study. Various studies concerned with reservoir-bank storage capacities <br />and how they will be affected by seepage are being looked into. <br />Preliminary results indicate that seepage would be less than earlier <br />Bureau studies and the Geological Survey's "steady-state" analysis <br />would indicate. Final results from the "transient" study will be <br />published by the Geological Survey in November 1978. <br /> <br />12 <br />
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