Short of replacing the entire water main, which is both expensive and disruptive, the only way to cut background leakage below these levels has been to reduce the water pressure.

由于费用昂贵而且破坏性大，没有人对水管进行彻底更换。减少底面渗漏流量的唯一办法就是降低水压。

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The main loads such as the water pressure, the sand pressure, the uplift pressure and so on are carried on by both the gravity wall and the rockfill body.

库水压力、淤沙压力和扬压力等主要荷载由重力墙与堆石体共同承担，重力墙与堆石体互相支撑，维持稳定。

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The main loads leading to collapse of dangerous rock are gravity, water pressure and earthquake force.

重力、水压力、地震力是危岩崩塌的主要荷载。

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In Houston last summer, there were 700 water main breaks every day due to aging pipes and pressure from increased water use and dry soil.

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United Utilities said this was caused by harmless sediment which normally lies at the bottom of water pipes and which can get stirred up due to the changes in pressure when a main bursts.

BBC: People evacuated after pipe bursts in Huyton