Water Planning Group DESCRIPTION OF REQUEST:

METHODS: We used the Groundwater Availability Model (GAM) for the Seymour aquifer (Ewing, and others, 2004). For the historical simulation (1975 to 1999), we used pumpage as included in the GAM with average annual recharge. We ran the GAM for the Seymour aquifer using average annual recharge for the period through 2060 and predictive pumpage based on new demands that the Panhandle Regional Water Planning Group plans to include in their 2006 regional water plan. Once we ran the GAM, we calculated saturated thickness by subtracting the bottom elevation of the Seymour aquifer as included in the GAM from the GAM calculated water levels. If the calculated water level exceeded the elevation of the top of the Seymour, the water level was changed to match the elevation value and then the difference between the top and bottom elevations was considered the saturated thickness. We used the same procedure to calculate the saturated thickness of the Blaine in Hall, Childress, Collingsworth, and Wheeler counties. We imported the saturated thickness data on a cell-by-cell basis into Surfer8 © for the Blaine aquifer and we contoured the information to create maps. We calculated and contoured the saturated thickness of the Seymour aquifer in Hall, Childress, and Collingsworth counties using ArcView. PARAMETERS AND ASSUMPTIONS