Code of Maine Rules
06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION
096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL
Chapter 500 - STORMWATER MANAGEMENT
Appendix 096-500-H - 24-hour duration rainfalls for various return periods
Universal Citation: 06 ME Code Rules ยง 096-500-H
Current through 2024-38, September 18, 2024
| COUNTY | Storm Type | 1-YR | 2- YR | 5- YR | 10-YR | 25-YR | 50-YR | 100-YR | 500-YR |
| ANDROSCOGGIN | III | 2.5 | 3.0 | 3.7 | 4.3 | 5.4 | 6.4 | 7.6 | 11.1 |
| AROOSTOOK C (Presque Isle Area) | II | 1.9 | 2.3 | 2.8 | 3.2 | 3.9 | 4.6 | 5.3 | 7.6 |
| AROOSTOOK N (Fort Kent Area) | II | 1.9 | 2.2 | 2.7 | 3.1 | 3.7 | 4.3 | 5.0 | 7.0 |
| AROOSTOOK S (Houlton Area) | II | 2.1 | 2.5 | 3.0 | 3.4 | 4.1 | 4.7 | 5.4 | 7.5 |
| CUMBERLAND NW (Bridgton Area) | III | 2.5 | 3.0 | 3.7 | 4.3 | 5.4 | 6.3 | 7.5 | 10.9 |
| CUMBERLAND SE (N Windham Area) | III | 2.6 | 3.1 | 3.9 | 4.6 | 5.8 | 6.9 | 8.1 | 12.1 |
| FRANKLIN | II | 2.0 | 2.4 | 2.9 | 3.4 | 4.2 | 4.9 | 5.7 | 8.2 |
| HANCOCK | III | 2.5 | 2.9 | 3.6 | 4.2 | 5.2 | 6.1 | 7.2 | 10.5 |
| KENNEBEC | III | 2.4 | 2.8 | 3.5 | 4.2 | 5.2 | 6.1 | 7.2 | 10.6 |
| KNOX | III | 2.6 | 3.2 | 3.9 | 4.6 | 5.7 | 6.7 | 7.9 | 11.5 |
| LINCOLN | III | 2.5 | 3.1 | 3.8 | 4.5 | 5.5 | 6.5 | 7.6 | 11.1 |
| OXFORD E (Rumford Area) | II1 | 2.3 | 2.7 | 3.3 | 3.9 | 4.8 | 5.7 | 6.7 | 9.7 |
| OXFORD W (Gilead Area) | II | 2.2 | 2.7 | 3.4 | 4.0 | 4.9 | 5.8 | 6.9 | 10.1 |
| PENOBSCOT N (Millinocket Area) | II | 2.2 | 2.6 | 3.2 | 3.8 | 4.7 | 5.6 | 6.5 | 9.5 |
| PENOBSCOT S (Hudson Area) | II | 2.3 | 2.7 | 3.4 | 3.9 | 4.9 | 5.7 | 6.7 | 9.7 |
| PISCATAQUIS N (Chesuncook Area) | II | 2.0 | 2.4 | 2.9 | 3.4 | 4.2 | 5.0 | 5.8 | 8.5 |
| PISCATAQUIS S (Monson Area) | II | 2.2 | 2.7 | 3.3 | 3.9 | 4.8 | 5.7 | 6.8 | 10.0 |
| SAGADAHOC | III | 2.6 | 3.2 | 3.9 | 4.6 | 5.7 | 6.7 | 7.8 | 11.4 |
| SOMERSET N (Pittston Farm Area) | II | 2.0 | 2.3 | 2.8 | 3.3 | 4.0 | 4.7 | 5.4 | 7.8 |
| SOMERSET S (Solon Area) | II | 2.3 | 2.7 | 3.4 | 3.9 | 4.9 | 5.7 | 6.7 | 9.8 |
| WALDO | III | 2.4 | 2.9 | 3.6 | 4.2 | 5.2 | 6.1 | 7.2 | 10.5 |
| WASHINGTON | III | 2.5 | 2.8 | 3.4 | 3.9 | 4.8 | 5.5 | 6.4 | 9.0 |
| YORK | III | 2.6 | 3.3 | 4.1 | 4.9 | 6.2 | 7.3 | 8.7 | 13.2 |
| 1Use Type III rainfall for the towns of Brownfield, Buckfield, Denmark, Hartford, Hebron, Hiram, Oxford, and Porter. | |||||||||
| Source: Data extracted by the Maine Department of Environmental Protection from the Northeast Regional Climate Center website (http://precip.eas.cornell.edu), Extreme Precipitation Tables. Data from this website was obtained from the National Oceanic and Atmospheric Administration's Regional Climate Center Program. June 2014 | |||||||||
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