lecture_10 - = GRADIENT BY TRACER TESTS: Q = G vn A =...

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LECTURE 10 - AQUIFER TRANSMISSIVITY 10.1 DIMENSIONS OF AQUIFER SYSTEMS GEOLOGIC MAPS WELL LOGS GEOPHYSICS EXAMPLES 10.2 AQUIFER TRANSMISSIVITY UNCONFINED AQUIFER: T = Kh WHERE: h = SATURATED THICKNESS CONFINED AQUIFER: T = Kb WHERE: b = SATURATED THICKNESS 10.3 METHODS FOR CALCULATION OF K AND T BY SOIL TEXTURE: K = C (d ) (HAZEN METHOD) 10 2 WHERE K = CM/SEC d = EFFECTIVE GRAIN SIZE (CM) OR 10 GRAIN SIZE THAT IS 10% FINER BY WEIGHT (MUST BE BETWEEN 0.1 AND 3.0MM) C = COEFFICIENT (40-150) VERY FINE SAND, POORLY SORTED 40-80 MEDIUM SAND, WELL SORTED 80-120 COARSE SAND, WELL SORTED 120-150 OR
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K = Cd 50 j WHERE: C = SHAPE FACTOR d = MEAN GRAIN SIZE (MM) 50 j = EXPONENT BY PERMEAMETERS EXPERIMENTS: Q = KAS or K = Q/(Adh/dl) WHERE: K = CM/SEC Q = CM /SEC 3 A = AREA CM 2 dh/dl
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Unformatted text preview: = GRADIENT BY TRACER TESTS: Q = G vn A = KAdh/dl e K = G vn / dh/dl e WHERE: K = CM/SEC G v = AVERAGE VELOCITY CM/SEC n = EFFECTIVE POROSITY e dh/dl = GRADIENT G v = Kdh/n dl x e BY INDUCED STRESS (AQUIFER TEST): EQUILIBRIUM OR STEADY RADIAL FLOW NONEQUILIBRIUM OR UNSTEADY RADIAL FLOW 10.4 CALCULATION OF GRADIENT HORIZONTAL GRADIENT h W dh/dl K THREE POINT PROBLEM VERTICAL GRADIENT 10.5 APPLICATION OF T AND K FLOW PROBLEMS GIVEN: K = 60GPD/FT 2 h = 20 FT W = 200 FT dh/dl = 0.02 SOLUTION: Q = KAdh/dl LEAKAGE PROBLEMS GIVEN: K = 60 GPD/FT 1 2 K = 0.003 GPD/FT 2 2 K = 30 GPD/FT 3 2 b = 80 FT 1 b = 10 ft 2 b = 100 ft 3 dh/dl = 5FT/10FT SOLUTION: Q = KAdh/dl...
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This note was uploaded on 07/25/2008 for the course GLG 411 taught by Professor Larson during the Fall '06 term at Michigan State University.

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lecture_10 - = GRADIENT BY TRACER TESTS: Q = G vn A =...

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