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• • <br />Project: Cripple Creek Geohydrology <br />Task: Apparent Basin Yield <br />APPARENT INFILTRATION YIELD IN THE CRIPPLE CREEK MINING DISTRICT <br />Data for flow from the Carlton Tunnel and the precipation to the Diatreme are available for the period 1992-2007. <br />When plotted, there is a strong inverse relationship between annual infiltration and annual precipiation. <br />The measurement point was moved in 1996, resulting in the reported flow being less than the actual <br />The data has been grouped on an annual basis, as follows: <br />Area of diatreme 200551910.6 sq.ft. <br /> <br />Year Annual <br />Precip <br />(inches) Annual <br />Precip to <br />Diatreme <br />(gpm) Measured <br />Annual <br />Carlton <br />Flow (gpm) Flow not <br />Measured <br />at Flume <br />(gpm) Adjusted <br />Annual <br />Carlton <br />Flow (gpm) <br />percent <br />1992 16.2 3848 1640 0 1640 43% <br />1993 15.2 3613 1631 0 1631 45% <br />1994 27.6 6557 1718 0 1718 26% <br />1995 26.0 6174 1893 0 1893 31% <br />1996 16.8 3991 1286 388 1674 42% <br />1997 17.2 4081 1394 260 1654 41% <br />1998 19.1 4549 1441 250 1691 37% <br />1999 24.0 5703 1540 250 1790 31% <br />2000 18.9 4488 1450 250 1700 38% <br />2001 20.5 4870 1550 250 1800 37% <br />2002 12.9 3061 1399 250 1649 54% <br />2003 19.0 4510 1257 250 1507 33% <br />2004 19.3 4600 1312 250 1562 34% <br />2005 16.3 3867 1330 250 1580 41% <br />2006 21.0 4995 1300 250 1550 31% <br />2007 23.5 5587 1308 250 1558 28% <br />Averages 19.6 4656 1465 197 1662.2 <br />• <br />Date: 4/8/2008 <br />Page 5-1 <br />Discussion: <br />The yield to the tunnel is strongly an inverse function of precipitation; flow is due to a constant portion, and a precipitation-dependent portion. <br />The constant portion dominates at low precipitation, but is less important at high precipitation. <br />Adrian Brown Consultants, Inc.