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Consider a small town in the Phillippines, where the average weight of people is 55 kg, and the average lifespan is 60 years. The people here eat lots of fish due to abundant availability from the local river. The river bed contains 0.0685% Calcium Arsenite Ca3(AsO3)2. The local industries also discharge various salts of cadmium in the river; the concentration of cadmium in water is 30 ppb (parts per billion) and the BCF of cadmium is 1000 L/kg and that of As is 0.00. The potency factor of Arsenic and Cadmium are 17.5 and 56.4 (mg/k-day)^-1. The Ksp of Calcium Arsenite is 4.93 x 10^-15. Consider each person drinks 1.8 L of water per day and eats 75 g of fish per day, 5 days a week. Determine the lifetime risk of a resident.
The natural air flow rate to this industrial shade structure is 90 m3/hour. Determine the risk to the workers who work 8 hours/day, 50 weeks/year for 30 years. Assume workers are 75 kg and live for 70 years.
During a BOD test, 2 mL of waste water having a DO of 0 was mixed with 298 mL of dilution water having a DO of 8.9 mg/L. After 5 days and 20 days, it was noted that the DO of the test bottle was 4.0 and 2.5 respectively,
A 5-ha residential development with 0.4-ha lots is to be drained such that the first 25mm of runoff is retained onsite and the postdevelopment peak discharge rate from the site is not to exceed 1m^3/s for thje 25-year 1-d rain event. The natural soil..
Route a trianglular hydrograph through a 100 foot wide rectangular channel with a bed slope of 0.015 and a Mannings n of 0.035. Take a distance between cross-sections of 3000 ft.
A steel column has a total unbraced height of 14 ft and carries an axial LRFD load of 950 kips. The column ends are fixed. Select an economical HSS 14x14 for this column.
Estimate the stopping distance required traveling northbound along University Drive towards campus assuming you are traveling at 40 mph under normal conditions.
Should the soil be compacted at the dry of optimum or at the wet of optimum condition in order to minimize the swelling potential? Briefly explain the reason for your answer.
A montmorillonite clay has a liquid limit of 160, a plastic limit of 75 and a shrinkage limit of 10. Calculate the percentage of change in total volume with respect to its initial volume when a specimen of this clay is completely dried from a water c..
Briefly explain the difference between piezometer and tensiometer with respect to the working principle, special design consideration and limitation of the instrument.
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Northern Tundra Telephone (NIT) has received a contract to install emergency phones along a new 100-mile section of the Snow-Moose Turnpike. Fifty emergency phone systems will be installed about 2 miles apart.
The average flow rate of the River Tiger into the lake was determined to be 3.5 m3/s and the average flow rate of the River Yankee out of the lake was measured at 2.5 m3/s (ignore any loses due to evapotranspiration).
Steam at 550 degree Celsius, 17.5 MPa enters the high-pressure turbine of an ideal reheat Rankine cycle. The steam exits the high-pressure turbine at 2 MPa, is reheated to 550 degree Celsius, and then expanded through a low-pressure turbine
A 4m deep clay layer is underlain by impermeable shale. A sample of clay from the layer is subjected to an appropriate increment of stress in a consolidation test giving the following results
An oedometer test on a clay soil gave the following results: Cc = 0.4, Ce = 0.08, OCR = 5. The thickness of the clay layer in the field is 2.6 m. The existing vertical effective stress at the mid-depth of the clay layer is 150 kPa.
The C-S-H gel can come in a variety of chemical structure forms. If it has a cement notation form of C3 S2 H8, what is the periodic table form of this C-S-H gel. What would be the balanced equations for C3 S and C2 S when hydrated into this form
What would be the resistance on a level road. What horsepower must be delivered to the wheels on the grade? If the efficiency is 80%, what must be the rated horsepower of the motor.
The modulus of elasticity of the sand was determined to be 10,000 kN/m^3 throughout. Using the Schmertmann's method, estimate the settlement of the footing four years after construction, using four 1 meter thick sublayers.
A cylindrical tank 5-m in diameter is filled with water to 3-m depth. A very short horizontal pipe with 20-cm diameter and rotary valve is used to drain the tank from the bottom. How long does it take to drain the tank to 50%?
Two forces are applied as shown to hook support. Knowing that the magnitude of P is 35 N, determine by trigonometry (a) the required angle a if the resultant R of the two forces applied to the support is to be horizontal, (b) the corresponding magnit..
Consider a diver weighing 200 lb at the end of a diving board that cantilevers out over 3 ft. The diver oscillates at a frequency of 2 Hz. What is the flexural rigidity EI of the diving board
The total flow then moves to a point W on the traction drive two metres off the ground, and travels through a nine millimetre diameter conduit. Ignoring all friction and minor losses, determine the pressures at points H and W.
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