Sizing Main
Sizing Main Calculator
Steps for sizing the main pipe:
1- Choose the desired drain spacing
2- Based on the desired drain spacing, estimate the drainage intensity using the Drainage Intensity calculator.
3- Choose a drainage coefficient (DC) that is greater than or equal to drainage intensity (DI) for best performance.
4- Calculate the area drained for a specific location along the main pipe.
Area drained = Drain spacing × (Total lateral length + Total main length)
5- Select the main pipe material, and enter area drained, main grade, and DC for that specific location, and click "calculate".