Streamgages

Information on the flow of rivers is a vital national asset that safeguards lives, protects property, and ensures adequate water supplies for the future.
There are two basic kinds of floods, flash flood
USGS real-time streamflow data are typically recorded at 15-minute intervals, stored onsite, and then transmitted to USGS offices every 1 hour, depending on the data relay technique used.
The beginning of a drought is difficult to deter
There can be occasional equipment or database problems where erroneous data are reported for short periods of time until corrections can be made.
Real-time USGS streamflow data are PROVISIONAL, meaning that the data have not been reviewed or edited. These data may be subject to significant change and are not official until reviewed and approved by the USGS.
In order to convert water height (“stage”, usually expressed as feet) into a volume of water (“discharge”, usually expressed as cubic feet per second), USGS hydrographers must establish a relationship between them..
Stream stage is an important concept when analyzing how much water is moving in a stream at any given moment. Stage is the water level above some arbitrary point in the river and is commonly measured in feet.