... ed., Professional Publications, Inc., San Carlos, CA, 1986, pp 5- 2 – 5- 3 14 Metcalf & Eddy, Wastewater Engineering: Collection and Pumping of Wastewater, McGraw-Hill, New York, 1981, p 11 15 Adapted ... operation, process control, and recordkeeping of water and wastewater treatment plants All of the uses addressed create the need for a number of flow-measuring devices, often with different capabilities ... volume of 855 .5 ft.3 Solution: 855 .5 ft ¥ 7.48 gal ft = 6399 gal ( rounded ) Note: As mentioned in Chapter 4, the term head is used to designate water pressure in terms of the height of a column of...