Water Supply Scheme Design: Calculating Supply Main Size
Factors to Consider in Calculating Supply Main Size:
Population Demand: The daily water demand per person and total population served.
Flow Rate: The rate at which water needs to be supplied to meet the demand.
Distance: The distance from the water source to the city.
Head Loss: The loss of head from the source to the city through the pipeline.
Pumping Duration: The time required to pump half of the daily supply.
Pipe Material Properties: Coefficient of friction for the pipe material.
How can we calculate the size of the supply main using the Weisbach formula and the Hazen-Williams formula?Calculation of Supply Main Size:
Weisbach Formula: We use the flow rate, pipe material properties, distance, and head loss to calculate the pipe diameter using the Weisbach formula.
Hazen-Williams Formula: This formula considers the flow rate, head loss, distance, and a coefficient to determine the pipe diameter.
By substituting the values into the respective formulas, we can calculate the approximate size of the supply main using both methods.
What are the calculated sizes of the supply main using the Weisbach formula and the Hazen-Williams formula?Calculation Results:
Weisbach Formula: The calculated size of the supply main is approximately 108 mm in diameter.
Hazen-Williams Formula: The calculated size of the supply main is approximately 102 mm in diameter.
These results provide insights into the pipe size required to meet the water demand for the specified water supply scheme.