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A conservative tracer is applied to the ground surface and leached through the vadose zone by rainfall. The average volumetric water content is 0.40 over the upper 4 meters and 0.30 over the remaining 3 meters above the water table and the net infiltration rate (Darcy velocity) is estimated to be 22 cm/yr. If the dispersivity is estimated to be 8 cm, estimate the time between when the concentration ratios of C/Co = 0.1 and C/Co = 0.9 reach the water table (where Co is the initial tracer concentration).
Assuming approximately 19,296 data points can be held in memory, with a 21X Datalogger (CR23X Micrologger), capturing battery voltage; panel temperature; 2 thermocouples
A radioactive waste from a clinical laboratory contains 0.2 μCi (microcuries) of calcium-45 (45Ca) per liter. The half-life of 45Ca is 152 days.
Lift Charts in direct marketing, The mass-mailing business is often used to illustrate the use of lift charts. Another real world application where the lift charts can be used
If a single deposit of $15,000 is invested at 2.75% yearly interest, what equal year-end withdrawls can be made each year for 10 years, leaving nothing in the fund after the 10th withdrawl
During a 108 minute long storm, the precipitation rate over a 100 acre area is 1.65 in/hr. The phi index is 0.42 in/hr. The average outflow from the area is 92 cfs during the storm. What is the value of combined detention and interception storages ..
A mass of .525g of NaCl has been added to a cylinder containing water. The cylinder diameter is 1.5in and depth of water in 5inches. Determine the concentration of the sodium ion in solution, showing your ans in units of a) mg/L b) mass % and c) m..
A glass jar is heated in an oven and sealed when the air pressure is 103 kPa and the temperature is 105 C. Find the absolute, gage, and vacuum pressures in the jar when it cools to 20 C.
Derive an expression relating effluent concentration to influent concentration, hydraulic residence time, and the reaction rate constant for a zero order reaction in a CSTR at stead-state.
Calculate the minimum flow rate (m^3/hr) of river water needed to acheive pre cooling hot, pasteurized liquid prodcut assuming that 10% heat is lost to the surroundings during exchange and that the water temp after cooling should not exceed 25 deg..
Water in a household plumbing system originates at the neighborhood water main where the pressure is 480kPa, the velocity is 5m/s, and the elevation is 2.44 m. A 19 mm (3/4-in) copper service line supplies water to a two-story residence
Tank A has a volume of 100 liters and contains saturated vapor r-134 at 30C. With the valve open slightly flow enters cylinder B. a pressure of 200kpa is required to lift piston in b. the process ends when the pressue at A drops to 200kPa.
Thirty six year old Johnson was in his last semester of his graduate program in Civil engineering. Father of two small children, he was anxious to get his degree so that he could spend more time with his family.
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