TM 5-814-3/AFM 88-11, Volume III
Assume a practical filter depth of 6 ft for stone-media filters. Apply NRC formula (para 12-12f[1]).
1
(eq C-14)
E '
1 % 0.0085(W/VF)0.5
resulting in
1
0.83'
1%0.0085 (2.920/V)0.5
Solving for the volume:
V = 5.0 acre ft = 218,760 cu ft.
With a filter depth of 6 ft, filter area (A = 218,760/6) 36,500 sq ft; therefore, to allow for plant flexibility and
partial treatment should a filter require maintenance, a minimum of 2 filters should be provided.
36,460
' 18,200 sq ft
Filter area (each) '
2
(2) Design with 1:1 recirculation.
(3) Design with 1:2 recirculation.
C-18
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