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A wastewater is discharged to a stream with a reoxygenation constant of 0.5 day-1 and a velocity of 1 m/sec. The oxygen saturation concentration in the stream is 11 mg/L. Immediately downstream of the discharge the oxygen concentration is 9 mg/L and the deoxygenation constant is 0.3 day-1. Upstream of the discharge the ultimate oxygen demand is 8 mg/L and the stream flows at 20 million gallons per day. The plant discharges a waste which has an ultimate oxygen demand of 30 mg/L and has a flow rate of 8 million gallons per day. What will the lowest dissolved oxygen concentration be downstream of the discharge and how far down the stream will it occur?
A barge has the trapeziodal shape and is 22 m long into the paper. If the total weight of barge and cargo is 350 tons, what is the draft H of the barge when floating in sea water
Dispute in largest open-pit copper mine, My recollection may be skewed, so for our purposes, consider this example a hypothetical, but this is my recollection of a real case. In the early 80s, in Salt Lake County, Utah, a dispute arose involving t..
A soil borrow material in its natural state in the ground has a unit weight of 86 pcf. Its natural water content is 9%. What is the dry weight of this material
the porosity of the soil is 0.52 with an organic carbon content of 0.1%. the depth to groundwater is 12m. provide a qualitative evaluation for the fate of PCE at the site as a basis for a phase I site assesment.
a gate shaped like .25 of a cylinder with radius r3m is used to control the flow of water through a canal.the height of
Determine the appropriate yellow and all-red interval to use for each phase. Assume a 10 ft/sec2 deceleration rate, a one second reaction time, and a 20 ft. vehicle length. Round up yellow and all-red times to the nearest ½ second.
Christian is picking out ties for a business trip. Anastasia knows from experience that Christian has a 50% chance of picking a grey tie. Find the probability Christian won't pick out a grey tie until the 3rd or 4th tie.
A lake with constant volume 10X10^6 m^3 is fed by a pollution-free stream with flow rate 50 m^3/s. A factory dumps 5m^3/s of a neoconservative waste with concentration 100 mg/L into the lake.
To be sure that the part does not fail, we plan to ensure that the maximum applied stress is only one third of the tensile strength. We use a non-destructive test that will detect any internal flaws greater than 1.25 mm long.
calculate the density and specific weight of carbon dioxide at a pressure of 300 kN/m^2 absolute and 60º C
You are designing a highway bridge. In particular you aretrying to determine how to put the road surface on the bridge. Youlive in an area where the maximum summertime temperature is 40 degrees centigrade and the minimum winter temperature is -30degr..
A pond is used to treat a dilute municipal waste-water before the liquid is discharged into a river. The inflow to the pond has a flow rate of Q = 4,000 m3/day and a BOD concentration of Cin = 25 mg/L.
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