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|Title:||Start-up performance of ground-water recharge trenches, Rocky Mountain Arsenal|
|Authors:||Program Manager for Rocky Mountain Arsenal (Colo.)|
Lutton, R. J.
Rocky Mountain Arsenal, Colorado
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-89-11.|
Abstract: The performance of ten gravel-filled trenches designed and constructed to recharge treated ground water to an alluvial aquifer was monitored through a 4-month start-up period. Trenches were 160 ft long and averaged about 16 ft deep in penetrating to the base of the unconfined aquifer. Flow capacities of individual trenches varied from about 2 to 40 gpm according to the variable nature of the alluvium. Water levels in 110 piezometers and wells were monitored weekly or more often within, downstream, and upstream of the trenches. Water levels rose as much as 11 ft adjacent to trenches. Water levels dropped in another large area when the rate of recharging through a surface infiltration pond was reduced. No deterioration of trenches was confirmed during start-up, and the system achieved the intended goals of a high rate of recharging and a favorable reversal of ground-water gradients.
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