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Recharge or Inflow Areas
Upland Recharge:
Precipitation infiltrates through the glacial embankment moraines along the edges of the valley is transmitted downward to the shallow and deep valley aquifers. Water-level monitoring on the Middle Fork Embankment indicates 5 to 7 feet of seasonal water-level fluctuation caused by storage of winter precipitation in the embankment sediments. Total upland recharge is estimated at 700 million gallons annually. Similar fluctuations occur on the South Fork and Cedar Embankments. The Cedar Embankment is also affected by Chester Morse Reservoir. It is estimated that up to 20 cfs of leakage from Chester Morse Reservoir enters the Snoqualmie Basin through the moraine in the area of Boxley Creek. The North Fork Snoqualmie/Tokul Delta also provides some inflow to the valley aquifers.
Valley Recharge:
Precipitation falling on the valley floor also infiltrates to the shallow aquifers. It is estimated that shallow groundwater recharge in the valley is on the order of 60 cfs, based on observed water-level fluctuations in wells over an approximate area of 18-square miles for the valley floor.
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©2003-2007 Golder Associates
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