0 a graph showing the amount of water in a place at different times, for example in a lake -- 水文图，水位曲线
The potential for hydrograph moderation may be an important consideration in -ood-prone areas.
Agriculture has changed the hydrograph, increasing peak runoff flows and shortening the length of runoff.
Drainage density can affect the shape of a river's hydrograph during a rain storm.
Although the pattern of the annual hydrograph is fairly predictable, its magnitude is not.
The record of flow over time is called a hydrograph.
Another application involves the separation of groundwater flow and baseflow from streamflow in the field of catchment hydrology (i.e. a method of hydrograph separation).
More precisely, it produces the surface runoff hydrograph as a response to a rainfall hydrograph as input.
In storm hydrology, an important consideration is the stream's discharge hydrograph, a record of how the discharge varies over time after a precipitation event.
