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Both calculators run independently — change the inputs on either side to compare results.

Pavement Thickness Design Calculator

Estimate the required pavement thickness for roads or parking lots based on traffic volume, subgrade strength, and design life. Essential during roadway design to prevent premature structural failure.

Daily Traffic (ADT) (vehicles/day)

Design Life (years)

Subgrade CBR (%)

Pavement Type

Fill in the required fields to see your result.

Civil

Pipe Flow Calculator (Hazen-Williams)

Determine water flow rate and velocity in pressurized pipes using the Hazen-Williams empirical equation. Ideal for civil engineers sizing water mains, irrigation lines, or fire-suppression systems.

Pipe Diameter (mm)

Pipe Length (m)

Head Loss (m)

Hazen-Williams Coefficient

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Key differences

	Pavement Thickness Design Calculator	Pipe Flow Calculator (Hazen-Williams)
Category	Civil	Civil
Inputs required	4	4
Result	Required Thickness (inches)	Flow Rate (L/s)
What it does	Estimate the required pavement thickness for roads or parking lots based on traffic volume, subgrade strength, and design life. Essential during roadway design to prevent premature structural failure.	Determine water flow rate and velocity in pressurized pipes using the Hazen-Williams empirical equation. Ideal for civil engineers sizing water mains, irrigation lines, or fire-suppression systems.