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Storm Water Drainage Calculator

Estimate peak stormwater runoff and determine the minimum pipe diameter needed to handle it. Used by civil engineers and drainage designers when sizing pipes for subdivisions, roads, or urban catchments.

Catchment Area (hectares)

Design Rainfall Intensity (mm/hr)

Runoff Coefficient

Pipe Slope (%)

Manning's Roughness Coefficient

Fill in the required fields to see your result.

Civil

Column Buckling Load Calculator

Calculates the critical (Euler) buckling load for a slender structural column given its material stiffness, cross-section, length, and end-fixity conditions. Use it to check column stability in steel, timber, or concrete frames.

Modulus of Elasticity (MPa)

Moment of Inertia (cm⁴)

Column Length (m)

End Condition Factor

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Key differences

	Storm Water Drainage Calculator	Column Buckling Load Calculator
Category	Civil	Civil
Inputs required	5	4
Result	Required Pipe Diameter (mm)	Critical Buckling Load (kN)
What it does	Estimate peak stormwater runoff and determine the minimum pipe diameter needed to handle it. Used by civil engineers and drainage designers when sizing pipes for subdivisions, roads, or urban catchments.	Calculates the critical (Euler) buckling load for a slender structural column given its material stiffness, cross-section, length, and end-fixity conditions. Use it to check column stability in steel, timber, or concrete frames.