P.L Arens认为可能发生的径流水一定要加以适当管理以便防止水土流失.首先应估算每块田地可能发生的最大径流(以十年为一期).估算可能发生的径流量的根据是:——半小时内降雨强度(至少包括十年的资料).——土壤渗透率资料(径流潜力).——土壤表面复盖率(植被截留降雨能力).——水平衡资料(有些月份降雨量超过蒸发量,径流不可避免). PL Arens believes that runoff water, which may occur, must be properly managed to prevent soil erosion.First, the maximum runoff that can occur in each field (in a decade) should be estimated.The basis for estimating the amount of runoff that may occur is: Rainfall intensity in half an hour (including at least 10 years of data) - soil permeability data (runoff potential) - soil surface coverage (vegetation retention rainfall capacity) - water balance data (rainfall in some months exceeds Evaporation, runoff inevitable).