The plan area of a reservoir is 1 km². The water level in the reservoir is observed to decline by 20 cm in a certain period. During this period, the reservoir receives a surface inflow of 10 ha-m and 20 ha-m are abstracted from the reservoir for irrigation and power. The pan evaporation and rainfall recorded during the same period at a nearby meteorological station are 12 cm and 3 cm respectively. The calibrated pan factor is 0.7. The seepage loss from the reservoir during this period in hectare-m is

A drainage basin has a area of 7322 km2. The average annual precipitation for this area is 909 mm. The average surface water flow at the outlet of the catchment is 21.4 x 108 m3/year and the average groundwater flow out of the basin is 94.6 mm/year. Assume trailing zeros are significant if present. Determine the annual average evaporation in mm/year. (give your answer to one decimal place)

The infiltration rate for excess rain on a small area was observed to be 11.43 cm/h at the beginning of rain and it decreased exponentially toward an equilibrium of 1.27 cm/hr. A total of 0.76 m of water infiltrated during a 10 hours interval. Calculate the value of k in Horton's equation.

During a particular 30-days period, the streamflow flowing into a reservoir averaged 5.0 cubic meter per second. Water supply withdrawals from the reservoir averaged 136 mgd (million gallon per day). The only other outflow from the reservoir was 9.4 cm of evaporation from the reservoir water surface. The average water surface area of the reservoir during the 30 days was 3.75 sq.km. The reservoir had 12,560 ac-ft of water in storage at the beginning of the 30-days period. Determine the storage content at the end of the 30 days in units cu.m.