If losses are more, the output is less and therefore, efficiency is less.ĩ. If the water losses are more, the output and the efficiency is more.Ĭlarification: Efficiency is inversely proportional to the losses. Given, Output = 1.6 cumec and Input = 2 cumecĨ. Compute the conveyance efficiency.Ĭlarification: By definition, Conveyance efficiency N c = (output/input) x 100 1.6 cumec is delivered to a turn-out, 1km from the well. The quantity of water that is pumped into a farm distribution system is 2 cumec. It accounts for the loss of water by deep percolation and evaporation following irrigation.ħ. Which of the following statement is wrong about consumptive use efficiency?Ī) It is the ratio of normal consumptive use of water to the net amount of water depleted from the root zoneī) It accounts for the loss of water by deep percolationĭ) The losses due to percolation and evaporation are not consideredĬlarification: It is the ratio of normal consumptive use of water to the net amount of water depleted from the root zone. The presence of excess salts in water requires high water storage efficiency in order to keep the salts washed out of the soil.Ħ. The presence of excess salts in the soil requires _Ĭlarification: Leaching is the supply of additional water to wash away the salts in a saline prone area. N d = (1- d/D) x 100 where d = mean deviation and D = mean depth of waterĥ. Determine its distribution efficiency.Ĭlarification: The formula for distribution efficiency is: The mean depth of water is 1.5 cm and the mean deviation from the mean is 0.1 cm. This is required in calculating water use efficiency.Ĥ. The quantity of water beneficially used is the sum of the water used by the crops and the water used for leaching.Ĭlarification: The beneficially used water accounts for the water required for leaching and by the crop as well. This efficiency accounts for the conveyance or transit losses.ģ. It takes into consideration the water lost in the farm hence, it is also known as on-farm efficiency.Ī) The ratio of the quantity of water delivered to the field and quantity of water pumped into the canalī) The ratio of water stored in the root zone and the water delivered to the fieldĬ) The ratio of water used beneficially and the water delivered to the fieldĭ) The ratio of water stored in the root zone and the water needed before irrigationĬlarification: It is the ratio of water delivered into the fields to the water entering into the channel. Which efficiency is also called on-farm efficiency?Ĭlarification: The water application efficiency is the ratio of water stored in the root zone to the water actually delivered to the field. Irrigation Engineering Multiple Choice Questions on “Water Requirements of Crops – Irrigation Efficiencies”.ġ.
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