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Hydrograph
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<p>A hydrograph is a graph showing the rate of flow (<a href="/facts/Discharge_(hydrology)/aFeFEHpC">discharge</a>) versus time past a specific point in a river, channel, or conduit carrying flow. The rate of flow is typically expressed in <a href="/facts/Unit_of_measurement/pvTpWbmC">units</a> of cubic meters per second (m³/s) or cubic feet per second (cfs). Hydrographs often relate changes of <a href="/facts/Precipitation/uq3nGQc8">precipitation</a> to changes in discharge over time. The term can also refer to a graph showing the volume of water reaching a particular <a href="/facts/Outfall/e7gvN8xA">outfall</a>, or location in a sewerage network. Graphs are commonly used in the design of <a href="/facts/Sewerage/bmbN015l">sewerage</a>, more specifically, the design of <a href="/facts/Surface_water/KQCY5RcY">surface water</a> sewerage systems and <a href="/facts/Combined_sewer/UUxl1lwB">combined sewers</a>. </p>