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A rainstrom lasts for 90 min at a constant intensity of 3.2 in/hr over a five acre parking lot. a detention pond is used to store all of the runoff from the parking lot and cannot be deeper than 2 ft. how many acres should the detention pond be to store the runoff from the parking lot. assume it takes 0.1 inches of rain to coat the parking lot surface, there is no inflitration from, or puddles on, the parking lot. Hint: set up a continuity expression for the pond with a variable surface area and solve for area.
Chromium contamination is a problem at a number of hazardous-waste sites. At one site local concentrations of chromium reached 60,000 mg chromium/kg soil and 19,000 mg/L chromium in the water.
In one observation well water stands 28.8 ft above the bottom at a radius of 687 ft, and in the other it stands 22.5 ft above the bottom. What is the discharge per 100 foot wide strip of the aquifer in square ft per day
Nairobi has a birth rate of 3.3 individuals per individual per year and a death rate of 3.2 individuals per individual per year. If the carrying capacity were 105, what would the population be in 25 years
How much annual income would be need to be generated over a 5 year period to be equivalent to $4,000 over an 8 year period. Consider 6% nominal interest (compounded annually) for both cases.
A well installed into a confined aquifer with a porosity of 0.3 and saturated thickness of 80 ft. The gravel pack requires a well screen slot width of 0.025 inches. The hydraulic conductivity of the aquifer is 60 ft/d. The radius of influence is 1200..
A vehicle of mass 2000 kg coasts along a horizontal track against a drag force Fd (in N) on the automobile given by the following Fd=kV^2 where k= 1.25 kg/m and V is the speed in m/s.
Analyze the stability of the dam shown in the figure, if the friction coefficient between concrete and foundation is 0.70, and the specific weights of concrete and water are 24kN/m 3 and 10kN/m 3 , respectively.
In trigonometric leveling from point A to point B, the slope distance and the zenith angle measured in A were 2504.897 m and 85o08'54". At B, these measurements were 2504.891 m and 94o52'10" respectively.
Your other assistant is measuring the propane (C3H8) concentrations, which are 75 microM at 200 m downstream and 52 microM at 1500 m downstream. What is the reaeration coefficient if it is assumed that no dilution occurred due to lateral flow?
Sodium hydroxide solution is to be concentrated from 10% to 30% by weight using a single effect evaporator operating at atmospheric pressure, The liquid circulates through a calandria consisting of 1 m long tubes 32 mm OD and 28 mm ID.
Balance by the compass rule the departures and latitudes listed in the following closed-polygon traverse. Calculate the linear misclosure, relative precision, and adjusted lengths and bearings
Determine the carburizing time necessary to achieve a carbon concentration of 0.35 wt% at a position 2 mm into an iron–carbon alloy that initially contains 0.10 wt% C
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