Laserfiche WebLink
• gains water through ground water contribution and is thus the likely <br /> ground water discharge area in Twentymile Park. <br />Ground eater movement is dow-dip toward the aforementioned <br />fault zone under a pressure gradient as shown in the piezometric <br />surface contours. The fault which runs northwest-southeast through <br />the proposed permit and adjacent area has displaced the overburden <br />aquifer and the piezometric surface and thus the flw of ground <br />water. In the vicinity of the fault, flow is generally to the north <br />toward the Fish Creek discharge area. Ground water entering the <br />fault zone floes upward under pressure, into the alluvium and stream <br />system of Fish Creek. <br /> <br />Ground Water Discharge Characteristics <br />Aa previously stated, ground water in the overburden aquifer <br />becomes confined dow-dip from the recharge area and floes out of <br />the persist and adjacent area under a pressure gradient. Although <br />vertical flow is hindered by the very low vertical permeability of <br />the confining shale layers, the artesian pressure in the heart of <br />the ground water basin (700 poi) is sufficient to enable some ground <br />water to move upward and discharge into the Fiah Creek watershed. <br />This is documented by Boettcher (1972) who states that roughly 25 <br />percent of the total streamflow in Fish Creek comes from ground <br />water discharge. No ground water is discharged into Foidel or <br />• Middle Creeks as evidenced by the lack of a natural base flow in the <br />stream in dry months. Assuming that ground water recharge and <br />2.04-43 <br />