Hydrology of Crater, East and Davis Lakes, Oregon by Kenneth N. Phillips
LIMITS OF ACCURACY
The elements of the estimated water budget for East Lake are based to a large extent on personal judgment. The estimated average annual precipitation (35 in.) and evaporation (28 in.) are probably within 15 percent; seepage loss and runoff estimates ‘are subject to greater possible error. The general conclusion is that the seepage rate is only a small percentage of the amount that would be needed to balance the gross water budget (precipitation plus runoff minus evaporation), if all the topographic basin were actually tributary to East Lake. Trial computations with modified values of runoff and evaporation gave results that differed only in degree and confirmed the general conclusion stated above.