available water supply

基本解释

Nationwide, China's available water supply per person is one-fourth the world average.
中国全国的人均可用水供应量仅为世界平均水平的四分之一。
In India's wheat-growing regions, for example, pesticide and fertilizer runoff have polluted up to 40% of the available water supply.
举个例子，印度的小麦产区可资使用的水源受杀虫剂和化肥的污染率已经达到了40%。
The area of a basin may be limited by elevation changes, by the size that can be covered uniformly by the available water supply on permeable soils, or by cropping factors.
格田面积受限于地面高度的变化、现有水量均匀覆盖于渗透性土壤的面积大小及耕作因素。
blog.sina.com.cn

High population density, a poor ratio of available water to demand, and regional imbalances in available water supplies are serious challenges for China in managing its usable water supply.
FORBES: Quenching China's Thirst For Water
Going back to the simple Law of Supply and Demand, our only solution is to increase the supply of clean water available in these communities.
FORBES: Investors Are The Key To Solving The World's Water Problems