1. A reservoir with surface area equal to 4,300 acres was built within a watershed basin. The area of the watershed was 200 mi2. Annual rainfall was 50 inches, mean annual runoff was 13 inches and mean annual evaporation was 35 inches. Calculate the mean depth in feet of the reservoir if all the storage within the watershed fills the reservoir.
2. The annual evaporation from the lake with surface area of 1,600 hectares is 0.30 m. Determine the average daily evaporation rate in hectare-centimeters per day during the year.
3. Over a period of 12 months, 550 mm of rainfall occurred over a given catchment area equal to 15,000 km2. Stream flow measured over a weir at the outlet of the watershed was 45 m3/sec. Measurements of groundwater indicated that the water table rose 5 cm during the 12 months in mm.
4. An 8000 mi2 watershed received 20 inches of precipitation in a 1-year period. The annual streamflow was recorded as 5000 ft3/sec. Roughly estimate the evapotranspiration in inches. State any assumptions made
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