• Use the sections AB and CDE to determine the two recession constants associated with the base flow components before and after the storm.
• Calculate the recharge as a result of the storm.

In a hydrologic framework report for the Department of Energy's Oak Ridge Reservation, the authors summarized that 'the mean annual precipitation for the period of 1951-88 was 1350 mm.' The mean annual runoff for streams on the Reservation was about 590 mm. They further suggested that 'the average consumption of water by evapotranspiration on the Reservation is about 760 mm.'

• What is the amount of recharge to groundwater during this period of time?
• What is the net storage change of groundwater during this period of time?
• What is the hydrologic budget equation that they may suggest? Please indicate each term you use in the equation.
• What is their assumption for the state of the hydrologic system on the Reservation for this period of time?
• How do you characterize the value of evapotranspiration reported by the authors?
  

Note the water inventory of a region in Maryland in the following table. The hydrologic equation for the region may be summarized as:

{recharge due to precipitation} + {recharge from stream} - {discharge due to evapotranspiration} - {discharge due to pumping for domestic water use} = {change in groundwater storage}

As a water resources engineer, please estimate the maximal amount of water that may be pumped each year for the six years shown in the table, if one does not intend to rely on groundwater storage for domestic water supply.