Extra Math Answers

  1. A wet well is 10’ x 8’ and a pump lowers the water level 3.1’ during a 5-minute pump test. What is the capacity of the pump in gallons per minute?
  2. If the pump in a lift station fails and the wet well is 15’ x 10’ and 15’ deep with an influent flow of 182 gpm, how long does the operator have to start bypass pumping before the station overflows?
  3. Given the following information, calculate the proper chemical feed pump setting in gallons per minute.
  4. Given the following information about a primary clarifier, how many gallons of primary sludge need to be pumped each day?
  5. How many gallons of 5.25% sodium hypochlorite are required to reach a residual of 100 mg/L in a well if the well casing diameter is 18 inches, the water depth is 80 feet, and the water has a chlorine demand of 5 mg/L?