There are many factors that affect the runoffmodulus and the variation coefficients of flood discharge and low flow, such as climate, rock, soil, land form, and so on.
影响流域洪、枯水径流模数、变差系数的因素很多，如气候、岩性、土壤、地貌等许多自然条件。
2
Then water inflow in tunnel is forecasted using groundwater dynamics and groundwater modulus of runoff.
然后利用地下水动力学法、地下水径流模数法对隧道开挖涌水量进行了预测。
3
The runoff coefficient and the erosion modulus are related to the rainfall.