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The Big Bear town council has asked that you determine whether the discharge of the town's wastewater into the Salmon River will reduce the DO below the state standard of 5.00 mg/L at Little Bear, 5.79 km downstream. They also want you to determine the minimum DO at any point downstream. Pertinent data are given in the table in Problem 7-33 in the book. Also, assume that the average cross-sectional area of the river is 1.78 m^2.
During a particular 30-day period, the streamflow flowing into a reservoir averaged 5.0 m3/s. Water supply withdrawals from the reservoir averaged 136 mgd. The only other outflow from the reservoir was 9.4 cm of evaporation from the water surface.
A canal was constructed running parallel to a river 1500 ft away. Both fully penetrate a sand aquifer with a hydraulic conductivity of 1.2 ft/d. The area is subject to rainfall of 1.8 ft/y and evaporation of 1.3 ft/y.
Part of the roof of a sports stadium is to be supported by the cables AB and AC. The forces the cables exert on the pylon A to which they are attached are represented by the vectors FAB and FAC.
A truck driver used sand to soak up a 1 g spill of lindane (C6H6Cl6). He placed the contaminated soil in an open drum which then filled with 150 L of water during a rainstorm. You test the water and find a concentration of 17 M/L.
(a) Derive equations for the shear force V and the bending moment M for segments: AB, AC and AD (Place the origin at point A). (b) Plot the shear-force and bending-moment diagrams for the beam using the derived functions.
The block is acted by its weight W=200 lb, a horizontal force Q=600 lb, and the pressure P exerted by the inclined plane. The resultant R of these forces is up and parallel to the inclined thereby sliding the block up it. Determine P and R.
Find the maximum bending stresses(wood) and (steel), in the wood and steel, respectively, due to the uniform load if the modulus of elasticity are E (wood)=10 GPa for the wood and E (s)=210 GPa for the steel.
State the full name of the section of SOLAS that sets out the minimum standards for the training and competence of crew members and describe how the surveyor would go about checking that a vessel had the necessary number of qualified staff.
Determine the slenderness ratio of a 5 m column with built in ends if its cross- section is (a) circular with a radius of 40mm and (b) 50 mm square. Use the concept of effective length.
Given that the seperation distance between the charges is 5m, q1 = -3q2, find the position where the net electric field is zero. Do not use infinity.
Provide the minimum number of ports. The design conditions are: Winter design fl ow rate 4,300 m 3 /d Minimum river elevation held constant by lock and dam system 99.0 m 500-year fl ood elevation 113.3 m River bottom elevation 90.4 m
A light bar AD is suspended from a cable BE and supports a 50-lb block at C. The ends A and D of the bar are in contact with frictionless vertical walls. Determine the tension in cable BE and the reactions at A and D
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