Changes

In a sump intake(a deeper intake than other intakes), water from a river or lake flows through an underwater pipe to a well or sump from where it is lifted, usually into the initial purification stages of a drinking-water system. The inflow opening of the underwater pipe is located below the low-water level and is screened. A well provides a place for sedimentation to settle and protects the pump against damage by floating objects. To facilitate cleaning, two sump intakes are sometimes built for one pump. A well-type pump may be set in a sump, with the inlet pipe through the river bank. In a simple intake, the pipe can be surrounded with a protective stone covering. In target intakes a pier can be used to provide access to the intake, for instance to operate a valve or clean the screen. The pier also provides some protection, and could be fitted with a bar screen to exclude debris from the intake. A duplicate inlet pipe, sump and pump may be provided to make it easier to de-silt the sump and maintain the pump.