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Results of Northern Trinity / Woodbine Groundwater Availability Model Simulations using a Modified Lower Trinity Transmissivity Distribution

New wells in the Lower Trinity Aquifer have shown the existence of a higher transmissivity zone in eastern Bell County than currently exists in the Texas Water Development Board (TWDB) approved Northern Trinity / Woodbine Groundwater Availability Model (NTWGAM). In particular, the area of higher transmissivity appears to occur to the east of the faulting included in the model. The attached “Lower Trinity Transmissivity” map illustrates the Lower Trinity aquifer transmissivity distribution in the NTWGAM and provides the results from recent pumping tests conducted on wells completed in the aquifer.