Hydrology of the upper ganga river

To provide the background hydrological information for the assessment of environmental flow requirements at four selected ‘Environmental Flow’ (EF) sites, a hydrological model was set up to simulate the catchment in the present state (with water regulation infrastructure) and to generate the natural flows (without water regulation infrastructure). The report further summarizes the hydrological information at these sites using a series of graphs which illustrate annual runoff variability, seasonal flow distribution, 1-day flow duration curves and daily flow hydrographs for one wet and one dry year. The document also contains a table, which lists some typical flow characteristics at EF sites on a month-by-month basis: range of expected baseflow discharges, number, magnitude and duration of flood events.

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