225320

270a

Source: Metcalf and Eddy, Inc., 1991, Wastewater engineering, 3d ed. (New York: McGraw-Hill).

Note: a1.5 X maximum day value.

Source: Metcalf and Eddy, Inc., 1991, Wastewater engineering, 3d ed. (New York: McGraw-Hill).

Note: a1.5 X maximum day value.

tuations (Metcalf and Eddy, Inc. 1991). About 60 to 85% of water usage becomes wastewater, with the lower percentages applicable to the semiarid region of the southwestern United States (Metcalf and Eddy, Inc. 1991).

Environmental engineers can use unit flow rate data to develop estimates for wastewater flow rates from residential areas, commercial districts, and institutional facilities. Tables 7.1.2 through 7.1.4 depict data for these use categories, respectively. Industrial wastewater flow rates vary and are a function of the type and size of industry. For estimation purposes, typical design flows from industrial areas that have little or no wet-process-type industries are 1000 to 1500 gal/acre per day (9 to 14 m3/ha • d) for light industrial developments and 1500 to 3000 gal/acre per day (14 to 28 m3/ha • d) for medium industrial developments (Metcalf and Eddy, Inc. 1991). Better estimates for industries can be developed with industry-specific information.

Wastewater volume generated in a municipality depends on the population served, the per capita contribu-

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