At the time, a number of California's local water agencies were proposing a different approach to the state's perennial water problems.

当时，加州当地一些供水机构提出了解决常年存在的水问题的一个不同的解决方案。

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Under moderate water level fluctuations, the species diversity will increase, and perennial water level fluctions play an important role in community succession.

长期的水位变动在植物群落演替上扮演重要的角色。

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The first is the water surface, which houses the Restroom and kitchen, because these two parts of perennial water or often wet, extremely important waterproof nature, don't let down.

首先是流水面，即房屋的洗手间和厨房，因这两个部位常年有流水或经常潮湿，（屋顶）防水天然极其重要，万万不要掉以轻心。

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Mr. BOB SIVINSKI (Program Director, New Mexico Forest Legacy Program): This ranch also has some deep canyons where there's perennial live water, which is really important in this part of New Mexico because this is a very dry area.

NPR: Saving Ranchland from Suburban Sprawl

But a perennial challenge has been in getting the water clean enough that it can be reused in the next frack job or simply discharged down a river or stream.

FORBES: Shale Gas Frackers Get Excited About ... A New Sponge?

Farmers plant a warm-season perennial grass and fallow the field for two years, improving soil quality and water-holding capacity.

FORBES: New Technology Reduces Agricultural Water Consumption