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A constant-head test was conducted on a sample of soil 15cm long and 60 cm^2 in cross-sectional area. The quantiities of water collected was 50 cm^3 in 20 seconds undera a head difference of 24 cm. Calculate the hydraulic conductivity. If the porosity of sand is 55%, calculate the average velocity and the seepage velocity. Estimate the hydraulic conductivity of a similar soil with a porosity of 35% from the results test.
How much contact time would be reuired for inactivating Giardia cysts using the following chemicals at the concentrations and temperatures stated: a. Chlorine Dioxide, 23C, 1.0 mg/L b. Chlorine, 12C, 1.6 mg/L c. Ozone, 10C, 5 mg/L d. Chloramines, ..
Laboratories containing dangerous materials are often kept at a pressure slightly less than ambient pressure so that contaminants can be discharged through an exhaust system rather than leaked through cracks and around doors to other parts of the ..
Calculate the relative velocity of a solute front that is flowing through an aquifer. The organic carbon partitioning coefficient (Koc) is 6 mL/g and the friction of organic carbon in the soil is 2%.
A stream is in equilibrium with atmospheric oxygen upstream of a waste outfall. The waste outfall creates a BODo of 20 mg/L in the stream. The k(BOD) is 0.4 /day and the k(o2) is 1.4 / day. The stream temperature is 15 degrees Celsius.
A nuclear facility in a coastal region is built to withstand ocean wave forces. Suppose the annual maximum wave height of the ocean waves (above the sea level) is a lognormal random variable with mean height of 4.0 meters and a c.o.v. of 0.8
Assume that there were 1,100,000 vehicles making a 28.5-mi round trip per day, the average vehicle emission rate for VOCs is 1.3 g/VM , and the molecular weight of the VOC emissions from the mobile sources can still be represented by that of metha..
A hoist mechanism is attached to the back of a pickup truck. The crate being moved by the hoist shown below weighs 200 lbs. Note: Point A is directly above point B and the vertical distance between points A and B is 16 inches.
The line is standard commercial steel pipe 75mm internal diameter. From the column to the pump inlet, the line is 25m long and contains 6 standard elbows and a fully open gate valve.
A piston-cylinder device contains 0.85 kg R-134a at 263K. The piston is free to move and has a mass of 12 kg and diameter of 25 cm. The atmospheric pressure is 98 kPa. Heat is added to the cylinder until the R-134 temperature = 10 o C.
A substance for which k is a constant undergoes an isothermal, mechanically reversible process from initial state(P1-->V1) to (P2-->V2), where V is a molar volume. a) Starting with the definition of k, show that the path of the process is described
Air flows steadily between two sections in a long, straight portion of 4 in. inside diameter pipe (D1=D2). The uniformly distributed temperature and pressure at each section are p1=100psia, p2=18.4psia, T1=540 R and T2=453 R.
The station of a PI of a horizental curve is 60+20. The horizental curve has a degree of 4 and a length of 400ft. the othere given design perameters include. Superelevation runoff rate is 1/400. width of the pavement is is 15ft.
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