Q. Izzard formula for the time of concentration in minutes for the plots having no channels, is (where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)

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Q. The equation given below, which is used for determining the velocity of ground water flow in metres per day is known as

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Q. While determining the yield of a gravity well by pumping, the depth of water table in two tests wells at distances r1 and r2 from the centre of the main well were found to be s1 and s2 respectively. Assuming the coefficient of transmissibility of the soil as T, the discharge Q may be given by

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Q. According to Thiem, the permeability of an aquifer may be obtained from the equation

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Q. Boston society of Civil Engineer's formula given by following equation, in cumecs/square km is based upon

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Q. The area enclosed by the adjacent isohyets of a catchment basin are shown under. The average depth of annual precipitation in the catchment basin will be

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Q. The rational formula for calculating the discharge, is (where A is the area of basin and Po is one hour rainfall)

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Q. The formula for calculating the overland flow time (To) in hours for any basin, is (where Lo is the distance of the critical point and H is the difference in elevation)

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Q. 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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Q. Precipitation caused by lifting of an air mass due to the pressure difference, is called

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Q. The standard height of a standard rain gauge, is

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Q. In India, rain fall is generally recorded at

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Q. A recording type rain gauge

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Q. In India the recording type rain gauge generally used, is

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Q. The run off a drainage basin is

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Q. For computing the run off volumes of large areas, number of infiltrations used are

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Q. From the Survey of India map, the distance of the critical point is 20 km and difference in elevation is 193 m. The over land flow time, is

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Q. If the area of storm hydrograph is equal to 10² cm, the ordinates of a unit hydrograph may be obtained by dividing the ordinates of the storm hydrograph by

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Q. If the potential infiltration of a water shed having a soil with fair pasture cover, is 10 cm and rainfall is 12 cm, the direct run off is :

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Q. The quantity of water retained by the sub-soil against gravity, is known

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