Water Quality Restoration Plan And Total Maximum Daily Loads (Tmdls) for the Lake Helena Watershed Planning Area 2004 Vol 1 2.0
Water Quality Restoration Plan And Total Maximum Daily Loads (Tmdls) for the Lake Helena Watershed Planning Area 2004 Vol 1 2.0
Montana.Dept. of Environmental Quality
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Seasonal dewatering occurs in the lower sections of Silver, Tenmile, and Prickly Pear Creeks as a result of irrigation withdrawals and losses to groundwater. However, seasonal flooding occurs in these same streams as a result of spring runoff and unpredictable winter thaws (Wetlands Community Partnership, 2001). During drought years, many of the streams in the watershed run dry. 2.3 Stream Flow Stream flow varies from site to site and from season to season in the Helena Valley as a result of co...mplex patterns of precipitation and runoff, groundwater and surface water interactions, and water diversions and storage. Flow increases in streams are attributed to tributary inflows or groundwater discharge, and flow depletions occur as a result of irrigation diversions and seepage to groundwater (USGS, 2001). A series of tile drains was installed throughout much of the Helena Valley during the late 1950s. The drainage system has lowered the elevation of the shallow aquifer, drained numerous acres of historical wetlands, caused the loss of natural infiltration and groundwater recharge areas, and reduced surface flows in lower Tenmile, Prickly Pear, and possibly Silver Creeks.
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