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WSP03145
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Last modified
1/26/2010 12:48:53 PM
Creation date
10/11/2006 11:35:08 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8271.300
Description
Colorado River Basin Salinity Control Program - General Information and Publications-Reports
Basin
Colorado Mainstem
Water Division
5
Date
1/1/3000
Title
Salinity Loading to the Colorado River
Water Supply Pro - Doc Type
Report/Study
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<br /> <br />" <br /> <br />r <br /> <br /> <br />.... <br />""-l <br />....:a <br />~ <br /> <br /> <br />located springs and the total discharge from these springs were <br />assigned to the well (Plate 1). <br /> <br />Various observation wells were included to observe drawdowns at <br />several points in the reservoir, including random iocations and <br />spring and well sites (Plate 1). <br /> <br />Numerous imaginary wells were used to simulate various known and <br />suspected boundaries. ,These boundaries correspond to the <br />approximate northern edge of the reservoir (no flow), the deeper <br />down-dip portions of the reservoir (recharge), and a northeast <br />trending fault system which appears to be recharging the western <br />portions of the reservoir (recharge) (Plate 1). <br /> <br />, <br /> <br />All springs (wells) and their 'respective imaginary wells were <br />allowed to flow for 100 years prior to flowing the Redstone <br />well. This was done to allow the hydrologic system to reach <br />equilibrium prior to subjecting the reservoir to any stress. As <br />a check on this equilibrium, the various springs were flowed for <br />a second 100 years and the drawdowns observed. Flowing for a <br />second 100 years resulted in a maximum increase in drawdown of <br />.1 foot. Residual drawdown at the various spring sites after <br />100 years of flowing represents depressions within a <br />potentiometric surface due to that spring. tn other words, if a <br />particular spring did not exist, the potentiometric surface <br />would be, higher"bY some amount at that location. <br /> <br />ASSUMPTIONS <br />Various assumptions are necessary in any analytical solution to <br />a problem. It is therefore important to identify and <br />communicate all assumptions use!:! in the analysis. Assumptions <br />in this analysi.. are listed: <br /> <br />1) The aquifer is homogeneous, flat-lying, confined, and <br />,infinite in _tent. <br />2) Each well is fully penetrating and has a constant discharge. <br />3) Storage in the well casing is neglected. <br />4) Image wells are used to simulate various boundaries. <br />5) Transmissivity= 480,000 GPD/Ft <br />6) Storativity= .0039 <br />7) Discharge of the Redstone well= 1544 GPM (weighted average <br />during test) <br />8) The Theis equation was used to calculate the change in spring <br />discharge as a function of drawdown at each. This approach does <br />not consider partial penetration of the springs, but the problem <br />becomes negligible as t (time) increases. <br />9) As discussed, two spring flows and locations are assumed. <br /> <br />3 <br /> <br />,<~--,,,,-~..-_.....,,....,,,,-,......... <br /> <br />I <br />
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