The Columbia River in the us Northwest lost about 14 percent of its volume from 1948 to 2004, largely because of reduced precipitation and higher water usage in the west.
在1948年至2004年间，位于美国西北部地区的哥伦比亚河的流量减少了约14%，这主要是由于降水量减少以及美国西部用水量增加。
As the density of larvae was reduced, the volume of water in the rearing chamber was decreased by lifting it up, keeping the water line above the bottom of the rearing chamber.
当幼虫的密度是不断减少，在繁育间内的水通过提起圆筒而减少，保持水线在繁育间底部上。
The volume quality of top soil is increased and the soil porosity is reduced owing to compaction, so water flow downward difficultly and the amount of water vertical infiltration is reduced.
由于压实，增加了表层土壤的体积质量，降低了土壤孔隙度，水不易向下运动。
Note: For the great decrease of self-supplied water volume in 2002, the total volume of water supply reduced.
注：2002年自备水供水量减少较多，因此全市供水总量出现下降。
The result from the testing by volume flow overrate demonstrates that when injected water as much as 150 fold of pore volume is used, permeability is reduced as much as 28% due to clay swelling.
体积流过量试验结果显示，当注入150倍孔隙体积注入水时，因粘土膨胀，渗透率下降达28%。
This indicated that the pruning can effectively reduced the transpiration water volume of whole individual tree in some degree.
修枝节约了林木用水，具有一定抗旱作用，可以说修枝也是一种节水措施。
This indicated that the pruning can effectively reduced the transpiration water volume of whole individual tree in some degree.
修枝节约了林木用水，具有一定抗旱作用，可以说修枝也是一种节水措施。
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