drainage area 流域 ; 排水面积 ; 汇水面积 ; 排水区
well drainage area 井的供油面积 ; 油井排油区
drainage area shape factor 泄油区形状因子
growth ratio of drainage area 流域面积增长率
The area has good natural drainage.
这个地区有良好的天然排水系统。
In late Holocene, climate is dryer and cooler than that in middle Holocene, the precipitation of drainage area decreases. So runoff deceases, the width of riverbed becomes narrow.
进入全新世晚期，由于气候相对于全新世中期变得较为干燥，也较为温凉，流域来水减少，故流量减小，河床宽度变小。
Fen river is the second largest branch of Yellow river. Also it has the largest drainage area and is the longest river in Shanxi province.
汾河是黄河的第二大支流，也是山西省境内流域面积最大，流程最长的河流。
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