From: Advances in Porous Pavement
Table One
| Table 1. Expected Storage Volumes |
Base Depth
(in) |
Rainfall
(in/ft2) |
Volume
(in3/ft2) |
Voulme
(ft3/ft2) |
Voulme
(gal/ft2) |
| 4 |
1.0 |
144 |
0.08 |
0.62 |
| 5 |
1.3 |
180 |
0.10 |
0.78 |
| 6 |
1.5 |
216 |
0.13 |
0.94 |
| 7 |
1.8 |
252 |
0.15 |
1.09 |
| 8 |
2.0 |
288 |
0.17 |
1.25 |
| 9 |
2.3 |
324 |
0.19 |
1.40 |
| 10 |
2.5 |
360 |
0.21 |
1.56 |
| 11 |
2.8 |
396 |
0.23 |
1.71 |
| 12 |
3.0 |
432 |
0.25 |
1.87 |
| 13 |
3.3 |
468 |
0.27 |
2.03 |
| 14 |
3.5 |
504 |
0.29 |
2.18 |
| 15 |
3.8 |
540 |
0.31 |
2.34 |
| 16 |
4.0 |
576 |
0.33 |
2.49 |
Notes:
- Void factor = 0.25 inch
- Rainfall volumes (inches per square foot) is the same as Design Rainfall Event if only rainfall falling directly upon the surface is calculated.
- Clay soil factor is used to determine conservative storage numbers with no allowances for exfiltration into subsoils below the pavement.
- Storage volumes are based upon the same principles of water stored in the void spaces of gravel or stone chambers, approximately 40% in stone greater than 0.25 inch in diameter.
Source: Invisible Structures
|
March-April 2005
From: Advances in Porous Pavement
Table One
| Table 1. Expected Storage Volumes |
Base Depth
(in) |
Rainfall
(in/ft2) |
Volume
(in3/ft2) |
Voulme
(ft3/ft2) |
Voulme
(gal/ft2) |
| 4 |
1.0 |
144 |
0.08 |
0.62 |
| 5 |
1.3 |
180 |
0.10 |
0.78 |
| 6 |
1.5 |
216 |
0.13 |
0.94 |
| 7 |
1.8 |
252 |
0.15 |
1.09 |
| 8 |
2.0 |
288 |
0.17 |
1.25 |
| 9 |
2.3 |
324 |
0.19 |
1.40 |
| 10 |
2.5 |
360 |
0.21 |
1.56 |
| 11 |
2.8 |
396 |
0.23 |
1.71 |
| 12 |
3.0 |
432 |
0.25 |
1.87 |
| 13 |
3.3 |
468 |
0.27 |
2.03 |
| 14 |
3.5 |
504 |
0.29 |
2.18 |
| 15 |
3.8 |
540 |
0.31 |
2.34 |
| 16 |
4.0 |
576 |
0.33 |
2.49 |
Notes:
- Void factor = 0.25 inch
- Rainfall volumes (inches per square foot) is the same as Design Rainfall Event if only rainfall falling directly upon the surface is calculated.
- Clay soil factor is used to determine conservative storage numbers with no allowances for exfiltration into subsoils below the pavement.
- Storage volumes are based upon the same principles of water stored in the void spaces of gravel or stone chambers, approximately 40% in stone greater than 0.25 inch in diameter.
Source: Invisible Structures
|