石堰
石堰-
同时，通过建立逸出坡降的经验公式，提出了较为完整的堆石堰坝渗流解析计算方法及相应的图解法，可以进行逸出坡降、逸出水深、渗流量、浸润线等项的计算。
In addition , by means of establishing the formula of exit gradient , this paper gives a complete computational method for rockfill weirs and dams , which can be used in computation of exit gradient , exit depth , seepage flow , water surface profile , etc.
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方法：在调查的样方内将梯堰（石堰、土堰）、坟地划为一种生境，麦田、春地划为一种生境，用夹夜法分别调查统计两种生境的鼠种及密度。
Methods : In the surveyed area , slope weirs ( stone , earth ) and graveyards were classified as one habitat , wheat fields and spring fields as the other . The night trapping method was used to determine the rat species and density in the two different habitats .