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Determine the rainfall excesses for successive periods by the Green-Ampt model. Assume a saturated hydraulic conductivity of 0.8 in./hr, a porosity of 0.62, an initial moisture content of 0.28, and an average capillary suction of 7.2 in. The depression storage is 0.5 in.
water from a treatment plant is pumped into distribution system at a rate of 4.38 m^3/sec, a pressure of 480 kpa and a temperature of 20 degree celcius. The pipe has a diameter of 750 mm and is made of ductile iron
The basic barometer can be used to measure the height of abuilding. If the barometric readings at the top and at the bottomof a building are 28.7 and 29.7 in Hg, respectively, determine the height of the building in feet.
Carbon disulfide (CS2) reacts with excess chlorine (Cl2) to produce carbon tetrachloride (CCl4) and disulfur dichloride (S2Cl2). If 69.7 g of CS2 yields 62.6 g of CCl4, what is the percent yield? (Hint, you must first write the balanced equation.)
For a temperature of 10 degree C, calculate the time needed for the following particles to settle 0.3m: a) a 20um mineral particle with a specific gravity of 2.1, and b) a 2 um organic particle with a specific gravity of 1.2
A gate having the cross section is 4 ft wid and is hinged at C. The gate weighs 18,000 lb, and its mass center is 1.67 ft to the right of the plane BC. Determine the vertical reaction at A on the gate when the water level is 3 ft above the base.
A minimum contact time of 30 min is required to reduce the pathogen concentration from 100 pathogens/L to below 1 pathogen/L through a first-order decay process. You plan on treating water at a rate of 1,000 gal/min.
Assuming that the nozzle is well insulated and operating at steady state and that the air behaves as an ideal gas, calculate (a) the mass flow rate of air in kg/s, (b) the exit area of the nozzle in m^2,
the pressure drop over 15 m of 2-cm diameter galvanized iron pipe is measured to be 60 Pa. If the pipe is horizontal, estimate the flow rate of water. use for water v=10^-6 m^2/s and density of water = 1000kg/m^3
If design is needed, use a W-built-up cross section; select the W section and the thickness of the plate. Calculate Cc and use the AISC equations E2-1 and E2-2 to determine the allowable stress for each axis and ultimately the allowable load for t..
While the swing bridge is closing with a constant rotation of 0.5 rad/s, a man runs along the roadway such that when d = 10 ft he is running outward from the center at 5ft/s with an acceleration of 2 ft/s^2, both measured relative to the roadway.
The casting has a mass of 3 Mg. Suspended in a vertical position and initially at rest, it is given an upward speed of V mm/s in 0.3s using a crane hook H. Determine the tension in cables AC and AB during this time interval if the acceleration is ..
The initial investment is $12,000 , there is no annual maintenance cost for the first 3 years , however , it will be $2,000 in each of years four and five , and then $4,500 in the sixth year and increasing by $2,500 each year thereafter .
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