This standard describes the minimum requirements for vertical water supply wells. Major revisions made to the standard in this edition include the following: the format has been changed to AWWA standard style; the definitions of parties have been revised to approved wording; the standard no longer endorses the use of screen entrance velocity as the sole criterion for determining the minimum length of well screen, this issue is addressed by changes in Section II of the Foreword and Sec. 4.5.3, 4.5.4, and 4.5.5.3 of the standard; in addition, Appendix L has been added to provide illustrative examples of calculations of well-screen length versus entrance velocity, using different screen open areas and design velocities; Table K.4 in Appendix K has been updated to reflect current industry properties for PVC well casing; two tables in Appendix K of the previous standard have been removed from this revision of the standard; former Tables K.5 for ABS well casing and K.6 for SR well casing have been discontinued, as these products are no longer widely used for water well construction.

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