Figure 43. Diagram summarizing the water budget of the southern High Plains aquifer (of which the Ogallala is a major part). Pre-development influxes and outflows were balanced. Development of the central part of the aquifer, primarily for irrigation, has slightly reduced natural seeps and springs along its eastern edge (A). Total withdrawals grossly exceed natural recharge (by about 35 times); a large fraction re-infiltrates as irrigation return flow, but the deficit is over ten times the recharge (B). All units are million cubic feet per day.
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