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为了减少水的渗漏损失，提高水的利用系数，我们在设计新渠道或治理旧河道时，都要对河流、河坡进行衬砌。为了达到既节省投资，又美化环境的目的，在衬砌河道时，通常只衬到设计水位以下。设计水位以上设置一定的草皮护坡，在北京地区，草皮护坡的边坡系数通常都采用1．5－2．
In order to reduce the seepage loss of water and increase the utilization factor of water, we should carry out lining of rivers and river slopes when designing new channels or treating old river channels. In order to achieve the goal of saving investment and beautifying the environment, lining rivers often lacks only below the designed water level. Above the design water level to set a certain turf slope protection, in Beijing, the slope factor of the turf slope protection are usually used 1.5-2.