The average level of surface runoff during the same period was 3.46 inches.
An area having a common outlet for its surface runoff.
Total annual surface runoff is estimated at 43 to 48 km3, depending on the source.
Seeds are dispersed on the wind and in surface runoff.
The creek receives surface runoff from open space and residential land use.
Trees and other plants help to control surface runoff.
Its source of freshwater has been increased from natural historical levels by urban surface runoff.
The country's mean annual surface runoff has been estimated at more than 2 billion cubic meters per year.
Relative to ocean water, this has a high chemical load from surface runoff.
First flush is the initial surface runoff of a rainstorm.