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• PROJECT: FLOW FROM GLOBE HILL MINE TO SCHIST ISLAND MINE - MOD DATE: 11/19/2008 <br />AUTHOR: Adrian Brown, P.E. PAGE: 2 OF 4 <br />0 <br />• <br />ANALY515 <br />Isotropic Hydraulic Conductivitv <br />Evaluatinn is fnr the 6 ,11 r-- ..e L..... ..1:_ ___?.. .. <br />- -- -- ----••- __........ <br />Vertical Hydraulic conductive of rock ..... .vi u.c <br />ft/ r .dual VU- <br />1 cllllca 111 me wafreme. <br /> <br />Horizontal hydraulic conductive of rock <br />ft/ r <br />1 10 100 1000 <br /> 10 100 1000 <br />Cmmmuta wntor rlonfh - rtl-i- Lim <br />Catchment area of Globe Hill Mine -sq. ft. 3537709 3537709 3537709 3537709 <br />Area of base of mine s .ft. 159736 159736 159736 159736 <br />Precipitation event assumed 24 hr max in 12 12 <br /> <br />Volume of water to Globe Hill Mine <br />cuft <br />3537709 <br />3537709 12 <br />3537709 12 <br />3537709 <br />Runoff coefficient % 100% 1000/0, 100% 100% <br />Depth of water in mine floor ft 22.1 22.1 22.1 22 <br />1 <br />Elevation of Globe Hill mine floor ft 9865 9865 9865 . <br />9865 <br />Maximum Elevation of water in GH mine floor ft msl 9887 9887 9887 9887 <br />Compute lateral flow from Globe Hill to east <br />Lateral flow assumed in a strip of rock between the top of the water in GH and the base of the backfill in SI. <br />Schist Island backfill assumed infinitely permeable, to maximize flow through bedrock between mines. <br />Head drop across rock between mines is assumed equal to elevation between GH water level and SI lip. <br />Flow is computed from Darcy's Law: <br />0 = Kh I A 1(h = h,,A- d:. , .. a...:.,:... . - I .. . - <br />- ------- --••--•••••• <br />Horizontal hydraulic conductive Kh • <br />ft/ r . - . ---Um <br />1 . 1GUIC1 IL H = area of now <br /> <br />Maximum Elevation of water in GH mine floor <br />ft msl <br />9887 10 <br />9887 100 1000 <br /> <br />Elevation of lip of backfilled Schist Island Mine <br />ft msl <br />9865 <br />9865 9887 <br />9865 9887 <br />9865 <br />Head loss from GH pool to SI backfill max ft 22.1 22.1 22.1 22 <br />1 <br />Distance from GH pool to SI wall fr. CAD ft 928 928 928 . <br />928 <br />Hydraulic gradient I ft/ft 0.024 0.024 0.024 0.024 <br />Elevation of base of Schist Island Mine ft 9305 9305 9305 9305 <br />Depth of lateral flow rock section ft 582.1 582.1 582.1 582 <br />1 <br />Width of lateral flow in rock from CAD ft 590 590 590 . <br />590 <br />Cross sectional area of flow GH>SI A s .ft. 343467 343467 343467 343467 <br />Lateral flow from GH towards SI max <br />1 cult/ r 8197 81970 819702 8197023 <br /> gpm 0.12 1.17 11.67 116.65 <br />Compute vertical loss of flow during transit from Globe Hill towards Schist Island <br />Diatreme is unsaturated for approximately 3000 feet below GI and SI area <br />Any water entering the bedrock in this area is subject to vertical flow under gravity <br />Flow is computed from Darcy's Law <br />0 = Kv I A Vv = hvrtroul:n <br />--_-.---_.. <br />Vertical hydraulic conductivity Kv .. <br />ft/ r .. v. u..nv <br />1 &--IL <br />10 r% - dl ud UI l1UW <br /> <br />Vertical hydraulic radient I <br />ft/ft <br />1 <br />1 100 1000 <br /> <br />Distance from GH pool to SI west lip fr. CAD <br />ft <br />2230 <br />2230 1 <br />2230 1 <br />2230 <br />Width of lateral flow in rock from CAD ft 590 590 590 590 <br />Cross sectional area of flow GH>SI A s .ft. 1315700 1315700 1315700 1315700 <br />Vertical flow loss from GH to SI tuft/ r 1315700 13157000 131570000 1.316E+09 <br /> m 19 187 1872 18724 <br />Evaluatr± lateral Onw to C1 err,.., r-u <br />Flow from SI to GH m 0.0 0.0 0.0 0.0 <br />Penetration towards lip of SI from GH ft 14 14 14 14 <br />Percentage of total distance to overflow % 0.6% 0.6% 0.6% 0.6% <br />Adrian Brown Consultants, Inc., 130 West Fourth Avenue, Denver, Colorado <br />303-698-9080