A graph showing the plot of water flow in a water course, or the elevation of groundwater in a borehole above a particular datum point, against time. The ‘unit hydrograph’ is the name given to a method of calculation which allows rainfall to be converted to stream flow and so facilitates the prediction of how particular river basins will respond to changing precipitation patterns. The discharge hydrograph shows the flow rate of water against time for a discharging water body. The stage hydrograph shows water level against time.
A graph of discharge, or of the level of water in a river throughout a period of time. The latter, known as a stage hydrograph, can be converted into a discharge hydrograph by the use of a stage-discharge rating curve. Hydrographs can be plotted for hours, days, or even months. A storm hydrograph is plotted after a rainstorm to record the effect on the river of the storm event.
Hydrograph
- saponification
- saponin
- sapphire
- sapping
- SAPRIN
- saprolite
- sapropel
- sapropelic coal
- sapropelite
- saprophyte
- saprotroph
- sapwood
- SAR
- SARA
- Sarabhai, Vikram Ambalal (1919–71)
- Saracens
- SARAL
- Saratoga campaign (1777)
- sarcolemma
- sarcoma
- sarcomere
- sarcoplasm
- sarcoplasmic reticulum
- Sarcopterygii
- Sardinia Radio Telescope