Assignment - Mathematics Advance Waterworks

For this assignment, please review all lessons in this weeks module and answer the following question, do not forget to submit them too.

Questions:

1. What is the flow rate in MGD of a 30” diameter pipe with a velocity of 5.5 fps? (hint flow rate problem)

2. Liquid sodium hypochlorite has a specific gravity of 1.69. What is the corresponding 
weight in pounds per gallon? (hint density-related problem)

3. How many pounds of ferric chloride are in 250 gallons of 22% strength? (Assume the 
specific gravity is 1.41) (hint density-related problem)

4.) Complete the following table with the corresponding unit for the varies water quality Maximum Contaminant Levels (MCL)

5.)  How many gallons are needed to dilute 30-gallons of 18.75% sodium hypochlorite 
solution to a 10% solution? (Hint this is a dilution problem)

6.) An operator added 85 pounds of 10% ferric chloride to a treatment flow of 4.1 MGD. 
What was the corresponding dosage? (Hint this is a dosage problem)

7.) What is the weir overflow rate through a 3.2 MGD treatment plant if the weir is 18 feet long? (Express your answer in MGD/ft and gpm/ft). (Hint Weir problem)

8.) What is the detention time in hours of a 300 ft by 50 ft by 25 ft sedimentation basin with a flow of 8.1 MGD? (Hint Detention Time Problem)

9.)  What is the detention time in a circular clarifier with a depth of 65 ft and a 95 ft diameter if the daily flow is 7.3 MG. (Express your answer in hours:minutes.) (Hint Detention Time Problem)

10.)A water treatment plant processes 15.2 MGD. What is the required filter bed area needed to maintain a filtration rate of 2.80 gpm/ft2? (Hint Filtration Problem)

Follow these steps to submit your assignment:

• Click on the Add Submission button, and type or copy/paste your answers into the Online Text box that appears below. 
• Click on the Save changes button

Grading Criteria:

Each answer is worth 10 points for a total of 100 points. This is math assignment, please refer to Lesson - Grading Assignments for a corresponding rubric table.