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Both calculators run independently — change the inputs on either side to compare results.
Civil
Stormwater Runoff Calculator
Compute peak stormwater runoff flow rate in cubic feet per second using the Rational Method (Q = CiA). Used by engineers to size drainage infrastructure like storm sewers, channels, and detention basins.
Fill in the required fields to see your result.
Civil
Excavation Volume Calculator
Calculate the volume of earth to be removed for a rectangular excavation — foundation pit, trench, or basement cut. Output is the in-situ (bank) volume in cubic metres, used for haulage planning, disposal cost estimation, and equipment sizing.
Fill in the required fields to see your result.
Key differences
| Stormwater Runoff Calculator | Excavation Volume Calculator | |
|---|---|---|
| Category | Civil | Civil |
| Inputs required | 3 | 3 |
| Result | Peak Runoff Rate (cubic feet per second) | Excavation Volume (m³) |
| What it does | Compute peak stormwater runoff flow rate in cubic feet per second using the Rational Method (Q = CiA). Used by engineers to size drainage infrastructure like storm sewers, channels, and detention basins. | Calculate the volume of earth to be removed for a rectangular excavation — foundation pit, trench, or basement cut. Output is the in-situ (bank) volume in cubic metres, used for haulage planning, disposal cost estimation, and equipment sizing. |