Water & environmental engineering
Runoff, rainwater and site-water tools for civil and environmental workflows.
Practical tools
Rational Method Runoff Calculator
Estimate peak runoff flow from catchment area, rainfall intensity and runoff coefficient.
Browse calculatorsPractical toolsRainwater Harvesting Calculator
Estimate collectable rainwater from roof area, rainfall depth and collection efficiency.
Browse calculatorsPractical toolsSloped Trench Excavation Calculator
Calculate trapezoidal trench excavation volume with equal side slopes and optional bulking allowance.
Browse calculators