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• PROJECT: FLOW FROM GLOBE HILL MINE TO SCHIST ISLAND MINE <br />- MOD <br />AUTHOR: Adrian Brown, P.E. DATE <br />: 11/ 8 <br />PAGE: : 2 2 OF OF 4 <br />ANALYSIS <br />Isotropic Hydraulic Conductivity <br />Evaluation is for the full range of hydraulic conducti <br />Tlhe Tertiary Volcanics in the diatreme <br />. <br />Vertical Hydraulic conductive of rock f1 <br />? <br />10 100 <br />Horiz ontal h draulic conductivit of rock ft 1000 <br />1 10 100 1000 <br /> <br />Compute water depth in Globe Hill <br />Catchment area of Globe Hill Mine s .ft. 3537709 3537709 3537709 <br />Area of base of mine 3537709 <br />s .ft. 159736 159736 159736 <br />Precipitation <br />event assumed 24 hr max i 159736 <br />- <br />n 12 12 12 <br />Volume of water to Globe Hill Mine cult 3537709 3537709 3537709 12 <br />3537709 <br />Runoff coefficient % 100% 100% 100% <br />Depth of water in mine floor 100% <br />ft 22 1 22 1 22 1 <br />Elevation of Globe Hill mine floor ft 22 1 <br />9865 9865 9865 <br />Maximum Elevation of water in GH mine floor ft msl 9887 9865 <br />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 i n SI <br /> <br />Schist Island backfill assumed infinitely permeable, to maximize flow through bedrock between min . <br />es. <br />Head drop across rock between mines is assumed <br />l <br />equa <br />to elevation between GH water level and SI li <br />Flow is computed from Darcy's Law: p. <br />Q = Kh I A Vk - .. <br />• <br /> <br />Horizontal hydraulic conductive Kh y <br />ft/ r i = n oraunc raoient <br /> <br />Maximum Elevation of water in GH mine floor <br />ft msl 1 10 <br /> <br />Elevation of lip of backfilled Schist Island Mine <br />ft msl 9887 <br />9865 9887 <br /> <br />Head loss from GH pool to SI backfill max <br />ft <br />22.1 9865 <br />22 1 <br />Distance from GH ool to SI wall fr. CAD ft 928 928 <br />Hydraulic gradient I <br /> ft/ft 0.024 0 <br />024 <br />Elevation of base of Schist Island Mine ft . <br /> <br />Depth of lateral flow rock section <br />ft 9305 9305 <br /> <br />Width of lateral flow in rock from CAD <br />ft 582.1 582.1 <br /> <br />Cross sectional area of flow GH>SI A <br />s .ft. 590 <br />343467 590 <br />343467 <br />Lateral flow from GH towards SI max tuft/ r 8197 81970 <br />I --- <br />A = area of flow <br />au ?c conductivit Kv W r 1 10 <br />Vertical hydraulic gradient I ft/ft 1 <br /> <br />Distance from GH pool to SI west li fr. CAD <br />ft <br />2230 1 <br />2230 <br />Width of lateral flow in rock from CAD ft 590 <br /> <br />Cross sectional area of flow GH>SI A <br />s .ft. <br />1315700 590 <br />1315700 <br />Vertical flow loss from GH to SI cuft/ r 1315700 13157000 <br /> m 19 187 <br />100 1000 <br />9887 9887 <br />9865 9865 <br />22.1 22.1 <br />928 928 <br />0.024 0.024 <br />9305 9305 <br />582.1 582.1 <br />590 590 <br />343467 343467 <br />819702 8197023 <br />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 />Q = Kv I A Kv = hydraulic conductive I = h draulic radient A = area of flow <br />Vertical h dr 1' <br />Evaluate lateral flow to SI from GH <br />• Flow from SI to GH m 0.0 O.C <br />Penetration towards lip of SI from GH ft 14 14 <br />Percentage of total distance to overflow % 0.6% 0.6% <br />100 1000 <br />1 1 <br />2230 2230 <br />590 590 <br />1315700 1315700 <br />131570000 1.316E+09 <br />1872 18724 <br />0.0 0.0 <br />14 14 <br />0.6% <br />Adrian Brown Consultants, Inc., 130 West Fourth Avenue, Denver, Colorado 303-698-9080