Civil Engineering - Water Supply Engineering - Discussion

A strainer type tube well can tap one or more confined aquifers lying one over the other, whereas a slotted type tube well can tap only one aquifer.

Under certain circumstances, as indicated below it may not be possible to provide either a strainer-type tube well or a cavity-type tube well. For example, if sufficient depth of water-bearing stratum is not available even upto a depth of 75 to 100 m then strainer type tube well cannot be provided. Similarly, if a suitable strong clay strata is not available then a cavity-type tube well cannot be provided. In such circumstances, a slotted type tube well can be provided if at least one stratum having a sufficient quantity of water is available.

What are the strainer and slotted type of tube well? Explain the difference.

Fine grain may enter through pores of strainer. That's why unsuitable.

Yep. And it will chocked/clogged the pores of strainer pipe.

If there is option of Clay then?