The designed flood peak flow in storm sewer is usually calculated by adopting a constant average runoff coefficient at present in China, simple as it is, it's not reasonable enough.
Adopting engineering measure and planting tree can decrease ground runoff coefficient and hold back ground runoff effectively.
In the mountainous watershed of the Heihe River, the runoff coefficient is much larger than that of the whole arid area, but it is still less than the average value over the whole country.
Landscape features within the basin land the size of the difference between the value of inter-month changes affect runoff coefficient.
Before 1980, no trend could be seen, but after 1980, the annual runoff coefficient tended to decrease.
Grey correlation analysis was used to study the effects of vegetation status on surface runoff coefficient for 4 kinds of forest ecosystems in Heshan Experimental Station.
The increase of rainwater runoff, runoff coefficient increases, the formation of the ground.
Annual precipitation had significant effects on the annual runoff coefficient.
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