Civil Engineering :: Water Resources Engineering
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Isopiastic lines are the contours
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The coefficients of permeability of soils of an unconfined aquifer and another confined aquifer were determined by pumping water from the wells and observing the effect of water table in two test wells at equal distances was found to be equal. The total height of confined aquifer H is given by
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The radius of influence is
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When a constant discharge 2.91 litres/sec. was obtained in a pumping test, the draw downs in the test wells at 3 m and 6.184 m were 2.6 m and 0.3 m respectively. If over-all depth of the pumping well was 16 m, the permeability of the soil, is
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If ω is unit weight of water, Q the discharge in cumecs, H the total head lift and η, the efficiency of the pump, the H.P. of the motor is
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If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as
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If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as
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The rate of evaporation from reservoirs may be determined by
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In estimating the rate of evaporation from the reservoir surface, a pan 1.5 metres in diameter, was filled upto 8.0 cm. During a specified period of time, the rainfall recorded was 5 cm. 3 cm of water was removed from the pan to keep the depth of water. At the end of the time, the depth was 9 cm. If the pan coefficient is 0.6, the evaporation loss is
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Dicken's formula for high flood estimate, is useful only for the catchments in
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(h1 + h2) 
