When the daily precipitation is less than 30 mm, no runoff occurs.

The water quality of the river in the demonstration area reaches the excellent level.

The utilization rate of rainwater resources is 12.5%.

The flood control standard is that the main road of Pingshui River can withstand the flood once in 50 years, and the other tributaries can withstand the flood once in 20 years.

The runoff coefficient is less than 0.148, that is, the total runoff control rate is more than 84.5%.

When the rainfall is 22.3 mm, the runoff is set at 76%.

In the event of rainstorm once in 30 years, the total amount of runoff will not be controlled by 75%.