Return Period (Years) | Depth (Inches) for Given Storm Period (Minutes) | ||||
5 | 10 | 15 | 30 | 60 | |
Return Period (Years) | Depth (Inches) for Given Storm Period (Minutes) | ||||
5 | 10 | 15 | 30 | 60 | |
1 | 0.3 | 0.5 | 0.6 | 0.8 | 1.1 |
2 | 0.4 | 0.6 | 0.9 | 1.1 | 1.4 |
5 | 0.5 | 0.7 | 1.0 | 1.3 | 1.8 |
10 | 0.6 | 0.9 | 1.1 | 1.5 | 2.0 |
25 | 0.7 | 1.1 | 1.4 | 1.9 | 2.5 |
50 | 0.8 | 1.3 | 1.6 | 2.3 | 3.1 |
100 | 0.9 | 1.5 | 1.9 | 2.7 | 3.6 |
Return Period (years) | Depth (Inches) for Given Storm Period (Hours) | |||||
2 | 3 | 6 | 12 | 18 | 24 | |
Return Period (years) | Depth (Inches) for Given Storm Period (Hours) | |||||
2 | 3 | 6 | 12 | 18 | 24 | |
1 | 1.3 | 1.5 | 1.7 | 2.0 | 2.2 | 2.3 |
2 | 1.7 | 1.9 | 2.3 | 2.6 | 2.8 | 3.1 |
5 | 2.0 | 2.3 | 2.7 | 3.3 | 3.6 | 3.9 |
10 | 2.3 | 2.6 | 3.1 | 3.7 | 4.1 | 4.5 |
25 | 2.9 | 3.3 | 4.0 | 4.8 | 5.3 | 5.8 |
50 | 3.7 | 4.1 | 4.9 | 5.8 | 6.4 | 7.0 |
100 | 4.4 | 4.9 | 5.9 | 7.0 | 7.8 | 8.4 |
Return Period (Years) | Depth (Inches) for Given Storm Period (Days) | |||
2 | 3 | 5 | 10 | |
Return Period (Years) | Depth (Inches) for Given Storm Period (Days) | |||
2 | 3 | 5 | 10 | |
1 | 2.6 | 2.8 | 3.3 | 3.9 |
2 | 3.4 | 3.7 | 4.2 | 5.0 |
5 | 4.2 | 4.6 | 5.5 | 6.6 |
10 | 4.9 | 5.5 | 6.4 | 7.8 |
25 | 6.3 | 7.0 | 8.0 | 9.8 |
50 | 7.5 | 8.4 | 9.5 | 11.7 |
100 | 9.1 | 10.0 | 11.5 | 13.9 |
Information Prepared by: Illinois Institute of Natural Resources
State Water Survey Division
Atmospheric Sciences Division
State Water Survey Division
Atmospheric Sciences Division
(Ord. 88-4582, passed 10-18-1988)