How it works
Estimate peak runoff flow from catchment area, rainfall intensity and runoff coefficient.
Formula:
Q = 0.00278 × C × i(mm/h) × A(ha).
Before you use the result: Local rainfall data, drainage criteria, soil behavior and excavation safety requirements can govern the design.
Practical use
Use project-specific rainfall, catchment, soil and excavation information. Drainage and excavation safety can be governed by local regulations and site conditions.
- Keep units consistent with the source information.
- Use project-specific densities, pack sizes and coverage rates where provided.
- Round purchasing quantities to supplier packaging and delivery rules.