Water Supply
Rapid Sand Filter Area
Filter bed area for a rapid (gravity) sand filter. Includes the conventional rule-of-thumb for number of units N ≈ 1.2·√Q (Q in MLD).
Formula
A = Q / v; N ≈ 1.2 · √Q (Q in MLD)
Typical RSF rate: 4–7 m/hr; up to 10 m/hr for high-rate filters.
Resultlive
- Total filter area, A
- 33.333m²
- Recommended no. of units
- 3
- Area per unit
- 11.111m²
- Bed dimensions (≈ L × W)
- 3.73 × 2.98m
- Backwash water demand
- 160m³/day
Reference: Conventional design: filtration rate 4–7 m/hr (CPHEEO Manual). N ≈ 1.2·√Q (Q in MLD) per common practice.