流量的基本概念單位時間內(nèi)，流體流過管道或設備某處橫截面的數(shù)量稱為流量。流體流量可用單位時間內(nèi)流過通道橫截面的流體體積或質(zhì)量來表示，前者稱為體積流量；后者稱為質(zhì)量流量. 體積流量的計算與流速相垂直的通道橫截面積為沿通道橫截面上的流體平均速度.我國的水資源相當缺乏，人均占有量遠遠低于國際平均水平，而且分布也不平衡。整體來說，東南部分水資源較為豐富，而西北由于降水少，水資源極度缺乏。流量測量
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