The phrase "drain water level" is grammatically correct and can be used in written English.
Example: The drain water level in the kitchen sink was becoming dangerously high, signaling a possible clog in the pipes.
The constructed weir was designed to reduce the magnitude of effluent groundwater gradients and retain shallow groundwater by maintaining high and stable drain water levels.
High hydraulic conductivity (>120 m per day) in the sulphuric horizons due to extensive macropores, combined with tidal modulation of drain water levels encouraged rapid seepage of acid groundwater.
While backwashing or vacuuming out to waste, be sure not to do not drain the water level below bottom of skimmer.
In parts of the country, a combination of shifting monsoon patterns, rising temperatures and a surge in the construction of wells that is draining ground water levels has left some villages seriously short of water.
Everyone knows that if you pour water into the tub faster than it drains out the water level will rise; unchecked, the tub will overflow and destroy your house.
Pour slowly and pause often: the grounds should never drain dry, but the water level should remain low.
Drain tile reduces the water level during these times, thereby allowing the root growth of plants to penetrate deeper into the soil, which, in turn, permits them later to resist hot dry weather.
The Environment Agency said it was running pumps 24 hours a day to drain water from the Somerset Levels.
The resulting stabilization of the water level also drained some of the marshes that had surrounded the old lake.
Yue Xi, the head of a team that has been excavating the drainage canal, told Xinhua, the state-run news agency, that the so-called quake lake should begin draining by Tuesday, once the water level is high enough to reach the mouth of the canal.
