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You are in charge to investigate the characteristic of a small river that can be assumed as a uniform and rectangular cross-section for modeling purpose. The width of the river is 10 ft, the depth is 1 ft, longitudinal slope of 0.001, and the Manning's coefficients is 0.03. To estimate travel times and dispersion coefficients, you injected 50 gm of rhodamine dye at one bank of the river because it will spread out soon enough. You also began the steady bubbling of propane, a gaseous tracer into the river at this location.
a. Your assistant is measuring the rhodamine concentration 1 km downstream. The data when converted to a spatial distribution at t = 2500 sec after dye release, show the following: 95% of the mass lies between 800 m and 1200 m at time t = 2500 sec. Estimate the longitudinal dispersion.
b. Your other assistant is measuring the propane (C3H8) concentrations, which are 75 microM at 200 m downstream and 52 microM at 1500 m downstream. What is the reaeration coefficient if it is assumed that no dilution occurred due to lateral flow?
c. How far downstream must your assistant go to collect the sample near shore that is representative of the entire channel cross-section?
If the time required to pay for parking is exponentially distributed with a mean of 15 seconds, find the average time in system.
A rental company is deciding whether or not to purchase the equipment. The company estimates the equipment will create annual incomes of $110K and have annual operating costs of $20K.
A previously calibrated rotometer is being used to measure a gas flow. Calculate the true volumetric flow rate of methane in the rotometer whe. The rotometer reads 4.0.
Draw the free-body diagram of member ABC which is supported by a smooth collar at A, rocker at B, and Find the Find the force of CD, and the force acting at point A & B
A bar of monel metal (length L=9 in., diameter d=0.225 in.) is loaded axially by a tensile force P. If the bar elongates by 0.0195 in., what is the decrease in diameter d What is the magnitude of the load P
Drawdown data from an observation piezometer near a well used for a pumping test with constant pumping rate is plotted on a semilog plot vs. time (the time axis, on the horizontal, is on a log scale).
A telephone wire 5 mm in diameter is suspended between telephone poles spaced 50 m apart. If the wind velocity is 100 km/h and the air is at 2 degrees C, 1 atm, determine the horizontal force (in N) the wire exerts on the poles.
An industry discharges .5m^3/s of waste with a 5 day CBOD of 500 mg/l to a river with a flow of 2 m^3/s and a 5 day CBOD of 2 mg/l calculate the 5 day CBOD of the river after mixing with the waste.
draw shear and bending moment diagrams determine the maximum stress on the beam (E=2.0E+11Pa) a simply supported beam AB is 5 m long carrying a uniform distributed load of 10kn/m over a 4m span
The frame shown is used to support high-tension wires. If W = 200 lb, b = 3 ft, a = 30°, what is the axial force in member HJ?
At a section in a beam the tensile stress due to bending is 70 N/mm 2 and there is a shear stress of 25 N/mm 2 . Determine from first principles, the magnitude and direction of the principal stresses and calculate the max shear stress.
Base course aggregate has a target dry density of 119.7 lb/cu ft in place. It will be laid down and compacted in a rectangular street repair area of 2000 ft*48ft*6in.
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