At a wastewaterdischarge point, 2500 L/s of effluent must be conveyedin a straight rectangular channel at a depth not exceeding 0.55 m. The smooth concrete channelbase is 1.8 m wide. The channelsides are constructed of rough-formed concrete. (a) Compute the flow area, wetted perimeter, and hydraulic radius at a section.  (b) Compute the suitably-weighted roughness factor for this flow condition and Using Manning’s method, compute the section factor and conveyanceat this section.  (c) What channel slope is required to convey the specified discharge?  What are the average and maximum shear stresses exerted against the channel?

How can I calculate the water level in a grit chamber at average flow and at peak hourly flow. The effluent from the tank flows over a fiberglass, sharp-crested weir that is set at elevation 136.00 ft above sea level (ASL). The average daily flow rate is 2.6 MGD. Assume that all flow must pass through one grit chamber. The dimensions of the grit chamber are 9 ft wide, 30 ft long, and 10.5 ft deep (water depth). The weir extends across the full width of the chamber. Peak hourly flow rate = _____MGD

Revision for exams want ot make sure i am doing it right

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15. Rigid boundary channels carrying sediment free water, should consider: a) The velocity of should not be slow for silting b) The velocity of should not be high for scouring c) The velocity is determined from Mannings formula 16. The conveyance of a channel section increases with: a) decrease in the wetted perimeter. b) increase in the wetted perimeter. c) does not depend on the wetter perimeter. 17. Flow in most sanitary and storm sewers can be treated as: a) Hydraulic flow b) Open channel flow 18. For Muskingum method, two constants values are given: Co= 0.6, C1=0.2, then which of the following will be a possible value of C2. a) 0.2 b) 0.22 c) 0.25

A tannery with a wastewater flow of 0.011 m½ and a BOD; of 590 mg/L discharges into a creek. The creek has a 10-year, 7-day low flow of 1.7 m^3/s. Upstream of the tannery, the BOD5 of the creek is 0.65 mg/L. The BOD rate constant k is 0.115 d-^1for the tannery and 3.7 d-^1 for the creek. The temperature of both the creek and the tannery is 20°C. Calculate the initial ultimate BOD after mixing.

H.W: Design a sedimentation tank to be treat 0.10 m³/sec

9.14. Oil of viscosity 0.48 Pa-s and specific gravity 0.90 flows with a mean velocity of 1.5 m/s in a 0.3 m pipeline. Calculate shearing stress and velocity 75 mm from the pipe centerline.

As a field engineer you are tasked to estimate the 25-year peak discharge for concrete parking lot that is 310 feet wide by 600 feet long using Rational formula. The longest flow path is 310 feet of sheet flow across the lot on a slope of 0.005 and 600 feet of shallow concentrated flow along the parking lot's length in a paved channel on a slope of 0.015. Use SCS procedures to determine the time of concentration using a 2-year, 24-hr rainfall of 2.4 inches. Use Figure below for the rainfall intensity in the rational equation. Intensity (in/hr) 0 10 20 25-yr average frequency 10-yr average frequency 30 40 -5-yr average frequency 2-yr average frequency 50 60 70 80 90 100 110 120 Duration (min)

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