The part of the Seymour Aquifer that is utilized the most is the area extent that cover most of Haskell and Knox counties in north-central Texas. The aquifer feeds thousands of irrigation wells across the area as well as livestock water supplies. The saturated thickness of the aquifer varies between 20 to 40 feet but can be close to 60ft in Northern Haskell County. Figure 6 on the left shows the saturated thickness of the Seymour in Haskell and Knox counties. The maximum extent of the Seymour aquifer in Haskell and Knox Counties shows the Seymour formation lying above the Clear Fork Group in the Permian Age. This means that the younger alluvium terraces at lower altitudes along the Brazos River are not connected with the Seymour Formation. The wells that were drilled into the Seymour have a yield average of about 270 gallons per minute and can be as high as 1,300 gallons per minute in some areas. The Transmissivity of the Seymour can range from as low as 2,700 to 40,000 feet squared per day. The daily average is calculated closely to 13,400 feet squared per day (Ryder, 1996)