High and low bucket basins are arranged by taking advantage of topographic conditions underlining river bed at release sluice of Qiaogong Hydropower Station.
利用桥巩水电站泄水闸河床地形特征，布置高低两种戽式消力池。
In traditional reservoir capacity calculation, a planimeter is used to obtain a reservoir capacity from topographic maps and large scale topographic maps are needed if high accuracy is required.
传统的库容计算方法是在已有的地形图上采用求积仪法进行，当精度要求较高时，需到现场实测更大比例尺的地形图。
A topographic feature consisting of a large flat area at a relatively high elevation with steep sides.
由大型平坦区域构成，有较高的海拔高程及陡峻的侧边的地貌特征。
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