Water Distribution - ECCC GE Exam 2021
Questions with Correct Answers
Water System Design Process 1. Determine Peak Demand (Q/GPM)
2. Size the water distribution pipes
3. Calculate Total Daily Demand for the system
4. Determine storage requirements
Peak Demand (Q) Max flow of water each facility in your plan will need. Determines
what size pipe is needed
Types of Distribution Systems Loop: Less risk. More waste
Dead End System (TO): Less waste. More risk
Values of Water Pressure 1 cubic foot of water = 62.4 lbs/cu ft.
1 square inch, 12" high column of water = .433 lbs
, Pressure =.433 psi x Height`
How to Determine Peak Demand (Q) (fixture unit value) x (# of fixtures) = total F.U.V
compare F.U.V on Peak Demand Table
* use interpolation formula
Calc. for Static Head Pressure P = .4333 (change in height)
Elevation = highest elevation - 2.31 (P)
Calc. for Dynamic Head Pressure (static head) - friction losses
General Numbers for Water Demand and Storage TO = 5-25 gallons per day
Storage requirement = TDD/2
Questions with Correct Answers
Water System Design Process 1. Determine Peak Demand (Q/GPM)
2. Size the water distribution pipes
3. Calculate Total Daily Demand for the system
4. Determine storage requirements
Peak Demand (Q) Max flow of water each facility in your plan will need. Determines
what size pipe is needed
Types of Distribution Systems Loop: Less risk. More waste
Dead End System (TO): Less waste. More risk
Values of Water Pressure 1 cubic foot of water = 62.4 lbs/cu ft.
1 square inch, 12" high column of water = .433 lbs
, Pressure =.433 psi x Height`
How to Determine Peak Demand (Q) (fixture unit value) x (# of fixtures) = total F.U.V
compare F.U.V on Peak Demand Table
* use interpolation formula
Calc. for Static Head Pressure P = .4333 (change in height)
Elevation = highest elevation - 2.31 (P)
Calc. for Dynamic Head Pressure (static head) - friction losses
General Numbers for Water Demand and Storage TO = 5-25 gallons per day
Storage requirement = TDD/2
