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Hydrologic Modeling

RFW Arial

Pajaro Basin Groundwater Modeling


Hydrologic Cycle

Groundwater computer models provide a means for finding solutions to very complex problems, geometries, properties, including transient problems and problems incorporating changes in properties with time. Groundwater modeling provides the Agency with the means to evaluate the effectiveness of proposed water resources projects and determine the most effective solution to overdraft and seawater intrusion. Often, when people refer to “groundwater models,” what they are talking about are numerical (computer) models. Coming up with a correct conceptual model is, perhaps, the most important step in any modeling project.

A conceptual model comprises your understanding of how the aquifer system works. Therefore, before building a computer model of the Pajaro Valley Aquifer System, it is important to characterize all of the inputs and outputs to the groundwater system as well as the geologic structure of the aquifers.

Recharge from Rainfall
Recharge from Stream Seepage
  Groundwater Flow out of Basin
Recharge from Applied Water
  Seepage from Aquifers into Streams
Groundwater Flow Into Basin

Previous Modeling Results


Previous Modeling Results There have been four basin wide models compiled for the Pajaro Valley Aquifer System. Three of the models utilized the Integrated Surface Water Groundwater Model (ISGM) code (Montgomery Watson, Teghavi and Smith) and one utilized Modflow 1988 modeling code. The annual model water budgets have been summarized in the comparison plot above. PVWMA utilized the modeling from Teghavi and Smith to analyze the effectiveness of the groundwater supply options brought forward in the Revised Basin Management Plan (2000).

Previous Modeling Results

Previous Modeling Results

Current Modeling Project


Previous Modeling Results