Water and Castner Range
Stormwater and just plain rainfall have always helped maintain water levels in the El Paso area’s two underground bolsons (Mesilla to the west of the Franklins and Hueco to the east). El Paso depends heavily on the runoff that seeps into the ground and then down into the bolsons. The Hueco Bolson is fed by runoff that flows eastward from the Franklins through porous Castner Range.
(A little-known fact: about 25% of the Franklins lie on Castner Range.) According to the EPWU report (p. 4), up to 5,000 acre feet per year of additional water “is available to recharge the Hueco Bolson through spreading basins constructed in Northeast El Paso”—basins such as the Range Reservoir and the enormous Northeast Ponding Area.