Movement of water infiltrated from a recharge basin to wells.

摘要: Local surface water and stormflow were infiltrated intermittently from a 40-ha basin between September 2003 2007 to determine the feasibility of recharging alluvial aquifers pumped for public supply, near Stockton, California. Infiltration produced pressure response that propagated through unconsolidated alluvial-fan deposits 125 m below land (bls) in 5 d deeper, more consolidated 194 bls 25 d, resulting increased levels nearby monitoring wells. The top saturated zone fluctuates seasonally depths about 15 20 m. Since start recharge, has reached as great 165 bls. On basis sulfur hexafluoride tracer test data, moved downward until reaching permeable zones 110 Once these zones, rapidly pumping wells at rates high 13 m/d. Flow highly material was confirmed on flowmeter logging, simulated numerically using two-dimensional radial groundwater flow model. Arsenic concentrations slightly result recharge 2 6 µg/L immediately basin. Although few water-quality issues identified during sample collection, velocities short travel times may have implications management this other sites heterogeneous aquifers.