Hydrologic Modeling
Pajaro Basin Groundwater Modeling
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.
Inputs |
Outputs | |
Recharge from Rainfall |
Pumping | |
Recharge from Stream Seepage |
Groundwater Flow out of Basin | |
Recharge from Applied Water |
Seepage from Aquifers into Streams | |
Groundwater Flow Into Basin |
Evapotranspiration |
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).
Current Modeling Project
