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Water Balance Concepts

Water Balance Concepts. Dale Ralston Ralston Hydrologic Services, Inc. Moscow, Id. Water Balance Analysis Inflow – outflow = change in storage. INFLOW. Aquifer Storage. OUTFLOW. Inflow is approximately equal to outflow. Addition of Pumping Results in a New Equilibrium. Withdrawal.

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Water Balance Concepts

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  1. Water Balance Concepts • Dale Ralston • Ralston Hydrologic Services, Inc. • Moscow, Id

  2. Water Balance Analysis Inflow – outflow = change in storage INFLOW Aquifer Storage OUTFLOW Inflow is approximately equal to outflow

  3. Addition of Pumping Results in a New Equilibrium Withdrawal INFLOW STORAGE OUTFLOW Start of pumping causes the system to be out of equilibrium; Water-level decline may cause an increase in recharge and does cause a decrease in discharge

  4. Subsurface Inflow River Seepage Subsurface Outflow Evaporation Springs and Seeps to Rivers Basin Inflow and Outflow Precipitation Ground Water Basin

  5. Equilibrium Resulting From Pumping Recharge Natural Recharge 0 Pumping Nat. Discharge A B C Discharge Time A) Recharge = Discharge 100 = 100 units/yr B) R + DR = D - DD + P - DS 100 + 10 = 100 - 20 + 50 - 20 C) 100 + 20 = 100 - 30 + 50 - 0

  6. Ground Water Depletion Natural Recharge 0 Nat. Discharge Pumping Time Water Level R + DRMAX = D - DD + P - DS 50 + 35 = 100 - 100 + 150 - 15

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