Question

Please show work.

Additional housing to accommodate 2000 persons is proposed for a residential area served by an existing 18-inch diameter vitrified clay sanitary sewer main constructed on a slope of 0.00412 ft/ft. To determine the feasibility of the proposed development, a 90° V-notch weir was placed in an existing manhole to measure the current flows. During peak hour flow conditions, the maximum head over the crest of the weir was measured at 16.5 inches. Note that the discharge over a 90 V-notch weir can be calculated from the expression Q-2.5H where Q free discharge in cubic feet per second (efs) and H-vertical distance (head) from the crest of the weir to the free water surface in feet. Also, assume that the sewer main is sized for 250 gpcpd, which includes an allowance for normal infiltration and full-flow capacity. Use n- 0.016 2. . Determine the full-flow capacity of the existing sewer main. . Determine the current peak hour flow in the sewer main. .Determine the projected additional flow due to the proposed development. Is the existing capacity adequate for the proposed development?

Answer 1