reservoir with a live storage of 300 million cubic metre irrigates 40000 hectares (1 hectare=10000 m2) a crop with wo fillings of the reservoir. If the base period of the crop is 120 days, What is the duty for is crop (in hectares per cumec)?
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- The monthly consumptive use values for paddy are tabulated below. What is average monthly consumptive use?The base period of a crop is 120 days and requires water equal to 40 cm. Determine the area that will be irrigated if the rate of discharge of water into the field is 2 m3/s.Determine the five-day irrigation demand for corn (Kc = 1.15) in m³/ ha if the actual crop evapotranspiration is = 0.28 in per day
- Assume that a 16-hectares tract of land is irrigated frequently and given enough water to keep the soil practically saturated below the 2-meter depth but that the water table is 30 meters deep. If the average K=35 liters per second per hectare, compute the number of hectare-millimeters of water that flow vertically downward to the water table each month.. An irrigation tank has a catchment area of 30 km2 and receives an annual rainfall of 90 cm.Assuming that 10% of the rainfall flows as ‘runoff’ from the catchment, calculate the area that can be brought under paddy cultivation under the tank. Assume that the tank fills one and a half times in a year and the water requirement of paddy (duty) is 100 ha- cm. (Determine volume of water required to irrigate a field of (160 mishara) during the period from April to August if the annual is about (0.90 m) and the percentage of consumptive use for each month as given in table below:
- Some crops are irrigated from the water of a reservoir by means of the canal system. The necessarydata about these crops is given below: Assuming 30% of losses of water in the entire canal system and15% losses in the reservoir, determine the necessary live storage of the reservoir in acre-ft.Crop Crop Period(days)Area(Acres)Field Duty(acre/cfs)Rice 120 6000 60Sugar cane 365 6000 60Wheat 120 10500 150Cotton 240 8000 100Estimates are that 11.6 x 106 m2 of rainforest will be destroyed in two hours. Assumingthat the initial area of tropical rainforests is 20 x 1012 m2:a. What is the exponential rate of rainforest destruction?b. If this rate is representative of the past and future and there were 24.5 x 1012 m2 ofrainforest in 1975, how much rainforest was left (in m2) in 2010?c. It is estimated that tropical rainforests remove or take-up 0.83 kg(C)/m2-year.How much less carbon [kg(C)] was removed in 2010 by rainforests compared tothat removed in 1975?4. The default carbon dioxide emission factor for biodiesel fuel is 70,800 kg/TJ, and theemission factor for diesel fuel is 74,100 kg/TJ.a. Which diesel fuel, biodiesel or “regular” diesel fuel, has the greater carbonintensity per unit of energy?Given the following: Cost of borrow = 500 pesos per cubic meter Cost of haul = 20 pesos per cubic meter / meter station Freehaul distance = 40 meters Solve for the length of economic haul.
- Q#2c) Whats the difference between Rabi and Kharif crops?An irrigator desires to lift a stream of 30 lps a vertical height of 12 m. If the loss of head in the casing and pump results in a 62% over-all pump efficiency and the electric motor has an efficiency of 90%, how many kilowatts (kW) and Bhp will his motor needs? What is the required water power (kW) and water horsepower (Whp)?Problem - 100 cm of precipitation fall each year on a 400 hectare farm. According to estimates, 20% of precipitation travels as runoff to the nearest watercourse and 40% of precipitation evaporates back into the atmosphere. The aquifer receives the remaining precipitation by percolation. All through the year, the aquifer is used to extract water for irrigation. Approximately 80% of the groundwater that is removed eventually evaporates. Determine how much groundwater recharge—measured in cubic meters—can be taken out annually for irrigation without dwindling the groundwater supply.