1) retention water level 2) top water level 3) normal top water level 4) full supply level 5) normal water level 6) storage level 7) normal pool level a) for a reservoir with a fixed overflow sill, the lowest crest level of that sill; b) for a reservoir, the outflow from which is controlled wholly or partly by movable gates, siphons or by other means, it is the maximum level at the dam to which water may rise under normal operating conditions, exclusive of any provision for flood surcharge GRM: n. (1,2,3,4,5,6,7) REG: American English (5) References: SEEreservoir