Definitions for "Low flow"
A certain time of year when a river’s water level is at its most shallow, usually July and August.
The flow below the normal operating range that requires additional bleed to maintain the operating characteristics of the unit.
minimum flow through a watercourse which will recur with a stated frequency. The minimum flow for a given frequency may be based on measured data, calculated using statistical analysis of low flow data,  or calculated using hydrologic analysis techniques. Projected low flows are used to evaluate the impact of discharges on water quality. They are, for example, used in the calculation of industrial discharge permit requirements.  orphology, River - the study of the form and structure of a river.
A condition that can cause excessive heat inside the pump volute. A temperature rise of 10°C (18°F) across the operating pump is considered excessive. Usually caused by throttling a pump discharge valve.