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The settling velocity of alum floc is approximately 0.0014 fps in water at 10 degrees celsius. Calculate the equivalent overflow rate in gpd/ft squared. What is the minimum detention time in hours to settle out alum floc in an ideal basin with a depth of 10 ft?
A water sample contains 118mg/L of bicarbonate ion, 19mg/L of carbonate ion, and has a pH of 9.5. What is the alkalinity of this water expressed as mg/L of CaCO3
A water tank has a height of 120m, and its area of cross-section is 2000m. Water is released from the tank and the water level drops by 1 meter every minute. Find the rate of change in volume.
an engineer uses a standard technique for measuring the thickness of a clay landfill liner that has a typical standard deviation of 0.7 in. The project specifications require the liner thickness to be 36 inches or more, at least 95 percent of the ..
Given s=.30/(60-u), where s is the spacing (space headway) in miles, and u is the speed in miles per hour, derive the relationships u-k, u-q, and q-k. Also, estmate the capacity (qmax) of the roadway.
Sewage flows through a 12" diameter pipeline then through an 18" diamenter pipeline. The flow is the same (unknown) value in each pipe, and the slope is the same (unknown) contant value for both pipes.
Knowing that end B of the tape is pulled downward witha velocity of 300 mm/s and that at the instant of the total thickness of the tape on the spool is 20 mm, determine (a) the instantaneous center of rotation of the spool,
Two small liquid-propellant rocket motors are mounted at the tips of a helicopter rotor to augment power under emergency conditions. The diameter of the helicopter rotor is 7m, and it rotates at 1 rev/s.
What is the effective stress 25 feet deep if the specific weight of the dry soil (dry unit weight) is 120 pcf and the water table is 12 feet deep
Knowing that the coefficient of kinetic friction between a sled and the run is 0.10 and that the speed of the sled is 25 ft/s at B, determine the tangential component of the acceleration of the sled a) just before it reaches B, b) just after it pa..
A well-mixed sewage lagoon (a shallow pond) is receiving 430 m^3/d of sewage out of a sewer pipe. The lagoon has a surface area of 10 ha (hectares) and a depth of 1 m. The pollutant concentration in the raw sewage discharging into the lagoon is 18..
Water flows i a 8-m-wide rectangular channel that has longitudinal slope of .0001. The channel has an equivalent sand roughness of 2mm. Calculate the uniform flow depth in the channel when the flow rate is 15m^3/s. Use the Darcey-Weisbach equation..
Plot the variation with depth (z) of the at-rest lateral earth pressure behind the wall, and determine the magnitude and location of the at-rest lateral earth force per unit length of wall.
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