Water Supply
Slow Sand Filter Area
Filter bed area for a slow sand filter (SSF) given design flow and filtration rate. Recommends two or more beds for continuity during cleaning.
Formula
A = Q / v
Typical SSF rate: 0.1–0.2 m/hr (i.e. 0.1–0.2 m³/m²/hr).
Resultlive
- Total filter area, A
- 166.67m²
- Area per bed (n beds)
- 83.333m²
- Width of each bed
- 6.455m
- Length of each bed
- 12.91m
Reference: WHO / IRC guidelines for slow sand filters. Sand: ES 0.15–0.35 mm, UC ≤ 3; bed depth 0.8–1.2 m; under-drain layer 0.3 m.