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Diameter
2'
2' 6"
3'
3' 6"
4'
4' 6"
Volume in gallons per foot of a Round Tank = Radius Square x 3.142 x 7.48 gallons per cubic foot.
Length & Width
4' x 4'
5' x 5'
6' x 6'
7' x 7'
8' x 8'
Volume in gallons per foot of a Square or Rectangular Tank = Length x Width x 7.48 gallons per cubic foot.
Soil Type
Coarse Sand
Fine Sand
Sandy Loam
Loam
Clay Loam
Silty Clay Loam
Clay, Non-Swell
Clay, Swell
Clay, Poor
The above table is provided as a guide only, you must follow all local, county and state code requirements.
CAPACITY OF ROUND TANKS
Per Foot of Depth
Gallons
Area Sq. Ft.
23.50
3.14
36.72
4.909
52.88
7.069
71.97
9.621
94.00
12.566
118.97
15.90
CAPACITY OF SQUARE OR RECTANGLE TANKS
Per Foot of Depth
Gallons
Area Sq. Ft.
119.68
16
187.00
25
269.28
36
366.52
49
478.72
64
PERCOLATION – HYDRAULIC CHART
Percolation Rate
Hydraulic Conductivity
Min./In.
<5
5 – 10
10 – 20
20 – 30
30 – 45
45 – 60
60 – 90
90 – 120
>120
Diameter
6'
6' 6"
7'
7' 6"
8'
8' 6"
Length & Width
9' x 9'
10' x 10'
11' x 11'
12' x 12'
14' x 14'
Hydraulic Loading
In./Hour
Gal./Day/Ft.2
>2
1.5 – 2
1.0 – 1.5
0.75 – 1.0
0.5 – 0.75
0.3 – 0.5
0.2 – 0.3
0.1 – 0.2
>0.1
10
Gallons
Area Sq. Ft.
211.51
248.23
287.88
330.48
376.01
424.51
Gallons
Area Sq. Ft.
605.88
748.08
905.08
1077.12
1466.08
Area Required
Ft.2/100Gal/Day
2.0
52
1.6
65
1.3
80
0.9
115
0.6
175
0.4
260
0.2
520
0.1
1040
0.075
1380
28.27
35.18
38.48
44.18
50.27
56.75
81
100
121
144
196
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