1) nominal discharge of a pump
2) rated discharge of a pump
3) nominal delivery of a pump
4) rated delivery of a pump
the rate of flow for which the pump is designed
GRM: n. (1,2,3,4)
References:
GEN flow
SEE operating flow of a turbine
SEE turbine flow
SEE rated discharge of a turbine
SEE nominal discharge of a turbine

ENERGY TERM COURTESY OF ENERGY.EU