Stormwater Runoff ની ગણતરી કેવી રીતે કરવી
Stormwater Runoff શું છે?
Stormwater runoff volume is calculated using rainfall and surface area characteristics. It's essential for drainage system design.
સૂત્ર
Use rational method: Q = C×I×A where C is runoff coefficient, I is rainfall intensity, A is area
- Q
- C×I×A where C is runoff coefficient — C×I×A where C is runoff coefficient
- C
- C value — Variable used in the calculation
- I
- I value — Variable used in the calculation
- A
- A value — Variable used in the calculation
પગલું દ્વારા પગલું માર્ગદર્શિકા
- 1Use rational method: Q = C×I×A where C is runoff coefficient, I is rainfall intensity, A is area
- 2C varies by surface: impervious (0.8-0.95), pervious (0.1-0.3)
- 3Results show peak flow for design storm
Worked Examples
ઇનપુટ
Area 10 ha, 60% impervious, rainfall 100 mm/hr
પરિણામ
Q ≈ 1.8 m³/s peak flow
For drainage system sizing
Common Mistakes to Avoid
- ✕Using wrong rainfall intensity for design frequency
- ✕Neglecting impervious surface increases from development
Frequently Asked Questions
Why use runoff coefficient?
Not all rain becomes runoff; some infiltrates soil. Coefficient captures this fraction.
What storm frequency should be designed for?
Typically 10-year storm for urban areas, 100-year for critical facilities, varies by code.
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