Hydrograph
（重定向自Rising limb）
![Stream hydrograph. Increases in stream flow follow rainfall or snowmelt. The gradual decay in flow after the peaks reflects diminishing supply from groundwater.](/Images/godic/202502/07/Stream_hydrograph5441.gif")
![Raster hydrograph. The entire flow record and patterns representing different timescales can be visualized.](/Images/godic/202502/07/Raster_hydrograph5441.png")
![](/Images/godic/202502/07/Hidrograma5441.png")
A hydrograph is a graph showing the rate of flow (discharge) versus time past a specific point in a river, or other channel or conduit carrying flow. The rate of flow is typically expressed in cubic meters or cubic feet per second (cms or cfs).
It can also refer to a graph showing the volume of water reaching a particular outfall, or location in a sewerage network. Graphs are commonly used in the design of sewerage, more specifically, the design of surface water sewerage systems and combined sewers.