runoff coefficient
1.By the test of the imitated rain, the article researches some rainfall runoff features of the plain area which the slope is less than 3‰, the changing regulation of runoff coefficient under the steady rainfall condition, puts forward the calculation principle of the rainfall runoff this area by using the maximum runoff coefficient method and makes a calculation of the runoff for the process of rainstorm under the unsteady or natural condition.
2.(2)In the condition of same soil profile moisture it was the linear regression relationship between the runoff coefficient and the rain strength.
3.The isotope EPM model calculation indicates that the hidden karst water system in the strong runoff zone has a natural recharge rate of 87.55 mm/a, a storage capacity of 9.62 billion m3/a and a mean storage coefficient of 0.029. The above-mentioned results are in the main in agreement with the results of hydrogeological exploration.
