Editing Environmental engineering (section)

===Water supply and treatment===
Environmental engineers evaluate the water balance within a [[drainage basin|watershed]] and determine the available water supply, the water needed for various needs in that watershed, the seasonal cycles of water movement through the watershed and they develop systems to store, treat, and convey water for various uses.

Water is treated to achieve water quality objectives for the end uses. In the case of a [[potable water]] supply, water is treated to minimize the risk of [[infectious disease]] transmission, the risk of [[Non-communicable disease|non-infectious]] illness, and to create a palatable water flavor. [[Water distribution system]]s<ref name="nap">{{cite book|url=https://www.nap.edu/read/11728/chapter/2|title=Drinking water distribution systems : assessing and reducing risks|date=2006|publisher=National Academies Press|doi=10.17226/11728 |isbn=978-0-309-10306-0|access-date=6 October 2019}}</ref><ref name="kfupm">{{cite web|title=Water Distribution Networks CE370|url=https://faculty.kfupm.edu.sa/CE/abukhari/Courses/CE370/Lectures/Water%20Distribution%20System.pdf|access-date=6 October 2019|website=King Fahd University of Petroleum and Minerals}}</ref> are designed and built to provide adequate water pressure and flow rates to meet various end-user needs such as domestic use, fire suppression, and [[irrigation]].