46101. The area of a drainage basin whose axial length is 100 km is 2500 sq. km. Its form factor is
46102. If the axial length of a drainage basin is 35 km and its form factor is 0.2, the total area of the basin is
46103. The elevation Z of the watershed is : (where letters carry their usual meanings)
46104. Run off is measured in
46105. Bernard's distribution graph is a plot of time on X-axis and
46106. An intense rain is falling at a uniform rate of 7.5 cm/hour for a period of 60 minutes on a basin whose areas is 500 hectares. If the average infiltration capacity during the entire rain period is assumed to be 1.5 cm/hr, the maximum run-off rate based on 10 minute peak percentage of 16% from distributing graph of the basin, is
46107. Isopiastic lines are the contours
46108. 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
46109. The radius of influence is
46110. 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
46111. If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as
46112. If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as
46113. The rate of evaporation from reservoirs may be determined by
46114. 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
46115. Dicken's formula for high flood estimate, is useful only for the catchments in
46116. Ryve's formula for flood estimate in cumecs, is
46117. Levees and flood walls,
46118. Water contains
46119. Unit Hydrograph theory was enunciated by
46120. The theory of infiltration capacity was given by
46121. Hydrology helps in
46122. The transitional middle portion of a logistic curve follows
46123. Pick up the incorrect statement from the following regarding fire hydrants
46124. The specific retention is least in case of
46125. B.O.D. of treated water should be
46126. Most commonly used pump for lifting water in water supply mains, is
46127. Economic height of a dam is the height corresponding to which
46128. Distribution mains of any water supply, is normally designed for its average daily requirement
46129. If pH value of water is
46130. In pressure supply mains, water hammer pressure is reduced by providing
46131. P0, P1, P2 be the populations of a city at times t0, t1 and t2 = 2t1, the saturation value of the population Ps of the city, is
46132. Water supply system includes
46133. Corrosion of a pipe
46134. Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is
46135. According to Kuichling's formula, fire demand in litres per minute for a population of P thousands, is
46136. The maximum permissible nitrites in public water supplies, is
46137. A high velocity of wash water is required for
46138. In distribution pipes, drain valves are provided at
46139. Corrosion of well pipes may not be reduced by
46140. Manholes along the mains from the source to a city are provided at 500 m intervals in
46141. The population growth curve is
46142. Turbidity of raw water is a measure of
46143. If V is total consumption of water in litres for a population of N individuals, per capita consumption or water allowance for the water supply Q, is given by
46144. Water supply includes
46145. Asbestos pipes are
46146. The maximum depth of sedimentation tanks is limited to
46147. By boiling water, hardness can be removed if it is due to
46148. The least thickness of class B cast iron (spun) pipe, is
46149. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for
46150. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level
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