By A.T. Rutledge
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The computer model PULSE, described in this report, can be used to construct a hydrograph of ground-water discharge to a stream. The model is applicable to a ground-water flow system that is driven by areally uniform recharge to the water table, and in which ground water discharges to a gaining stream. One of the two formulations used by the model allows for an instantaneous recharge pulse and subsequent ground-water discharge to the stream. The other formulation, which allows for a gradual hydrologic gain or loss term in addition to the instantaneous pulse, can be used to simulate the effects of gradual recharge to the water table, ground-water evapotranspiration, or downward leakage to a deeper aquifer.
Ground-Water Discharge Resulting from a Pulse Recharge to the Aquifer
Ground-Water Discharge Resulting from a Pulse Recharge to the Aquifer and a Gradual Gain or Loss Applied Areally
Procedure for Estimation of Ground-Water Discharge for a Streamflow Hydrograph
Model Input Variables
Initial Ground-Water Discharge
The Recession Index
The Time of Surface Runoff
Estimation of Recharge and GWET
Time Scales for Reporting Results
Computer Implementation of the Model
Possible Future Analysis and Application of the Model
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