0->NAssignment: Use the potentiometric data for the wells (circles, height in fet above an arbitrarydatum such as sea level) to contour the groundwater surface. Draw arrows showing the directionof regional groundwater flow based on this potentiometric map. Note the red dashed line is theconcentration of total dissolved solids.Blanco300Kilometers5003901TEXASMap Area3901000360Blanco River400355Gulf ofMexico340335PVS342315325327317500Canyon Lake03103453250275987326 Dripping Springs321/3335Kilometers300/340JacobsWell03203100278O29010321278275280WinberleyO250NcomoBarton Creek2652821000240218220San MarcosSpringsColorado River240190220220240200220O190170180Barton0160Springs190BudaAUSTIN-180-2180Saline EdwardsAquifer ZoneEdwardsPot. Surface(m-msl)-300- Trinity Pot.Surface (m-msl500- Total Dis-solved Solids(mg/l)SpringEdwards Aquiferu-unconfinedCc-confinedTrinity Aquifer(undívided)

Groundwater generally flows from the areas of recharge to the areas of discharge. Using water table map and potentiometric data for wells, elevations of groundwater at different points can be identified. Groundwater also flows under gravity from higher to lower points of elevation.From the given potentiometric map, it is very much clear that the groundwater in general flows from west to east as the discharge area is in the east and also the elevations of potentiometric surfaces of different wells tend to decrease from west to east side of the map. So you should draw arrows along the potentiometric data for wells (identified by circles on the map) showing eastward direction to describe the overall trend of regional groundwater flow.