Mitigation Zone Definitions |
Zone 1 |
Depth difference of 1-foot or greater for the 100-year and 500-year flood events (whichever is greater) within Cass and Clay Counties and along the Red River corridor within Richland and Wilkin Counties. |
Zone 2 |
Depth difference of 1 foot or greater for the 100-year and 500-year flood events (whichever is greater) within Richland and Wilkin Counties. |
Zone 3 |
This is an area in North Dakota beyond Federal Mitigation Zone 1 and Zone 2 where the Project causes a hydraulic effect of 0.5-feet or more at the 100-year flood event. |
Zone 4 |
This is an area in Minnesota beyond Federal Mitigation Zone 1 and Zone 2 where the Project causes a hydraulic effect of 0.1-feet or more from flood events up to and including the Probable Maximum Flood (PMF) flood event. Mitigation Zone 4 is divided into three sub-zones reflecting the flood event that defines the boundary of impacts. |
Zone 4A |
This is an area in Minnesota beyond Federal Mitigation Zone 1 and Zone 2 where the Project causes a hydraulic effect of 0.1-feet or more at the Probable Maximum Flood PMF event. |
Zone 4B |
This is an area in Minnesota beyond Federal Mitigation Zone 1 and Zone 2 where the Project causes a hydraulic effect of 0.1-feet or more at the 500-year flood event. |
Zone 4C |
This is an area in Minnesota beyond Federal Mitigation Zone 1 and Zone 2 where the Project causes a hydraulic effect of 0.1-feet or more at the 100-year flood event. |