Filters and Screens for Irrigation Wells. Page: 5
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Ground surface
Water surface
. during
" ,pumping
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Well casing
Pump column -ZWell
screenPump motor
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Water surface
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- Gravel filter
Clay, shale or stone layer// /// / ~/ f/// / / / ///// f / / /// 7 Y/7 /// / / ///
BN-e963
Diagrammatic view of a common type of irrigation well.Material that passes one screen and
is retained on the next smaller is
acceptable. Sometimes it is difficult
to obtain gravel screened in
this manner. But generally it is
best to reject gravel with a large
range of particle sizes.
Check to see that crushed rock is
not used for the filter.Reject material that becomes soft
and absorbs water.
Reject large material. Some
drillers follow the principle that
large filter material lets more water
through and makes a better well.
This is usually not true. A well
equipped in this manner may fail
because of sand movement. The5
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Robinson, A. R. (August Robert), b. 1921. Filters and Screens for Irrigation Wells., book, April 1959; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc3513/m1/5/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.