If the length of settling tank is 5 m, width is 3 m; depth is 2 m of a rectangular tank with discharge (Q) of 1.0 m3 / second; the settling velocity will be:

Environmental engineers use the principles of engineering, soil science, biology, and chemistry to develop solutions to environmental problems. They work to improve recycling, waste disposal, public health, and water and air pollution control. (Source: BLS.gov)