5 different F-M flood diversion plans and a massive ring dike studied

Although diversion supporters think about diking unfeasible for such a big space, a workforce of technical specialists, together with regulators, assembly Tuesday, Nov. 14, at Cass County workplaces right here agreed to take one other take a look at ring dikes and 5 different options that do contain a diversion.

“What we need to do is find yourself with some options for the duty drive to think about,” stated Kent Lokkesmoe, an administrator with the Minnesota Division of Pure Assets. “You possibly can have a no-dam various. The benefit of that’s you do not want a Minnesota state allow.”

He and 5 different engineers and planners make up the technical group advising the duty pressure convened by North Dakota Gov. Doug Burgum and Minnesota Gov. Mark Dayton to determine what sort of flood safety challenge would fulfill regulators.

Different options embrace totally different variants of the diversion challenge with the diversion channel and dam parts shifted round and new options, similar to an unlimited earthen tub east of Horace to retailer flood water and a whole lot of storage areas distributed all through the Pink River Basin.

Diversion opponents had urged the staff to think about an alternate with out the diversion channel or dam, resembling preventing floods with levees solely. They received their want, although the DNR has already agreed with the U.S. Military Corps of Engineers that levees alone cannot supply the flood safety required.

The duty pressure happened because of a lawsuit introduced by the DNR towards the corps and Fargo-Moorhead Diversion Authority to implement its determination to not concern a allow for the dam. The dam is required to stop the diversion from sending an excessive amount of water to downstream communities, however DNR officers have stated they really feel it removes an excessive amount of undeveloped land from the floodplain inflicting floodwater to be displaced upstream.

All the options being thought-about are supposed to scale back the upstream impression come what may. In addition to the ring dike right here, are some others concepts thought-about:

— Extra movement by means of city. Construct the diversion challenge as designed however with extra water flowing down the Pink via Fargo-Moorhead. This provides 2 to four ft to the river elevation, although the upper elevation would go away little or no freeboard, the area between the highest of a dike and the water floor. Freeboard is required to stop waves, ice jams and different sudden modifications in water degree from overtopping the dikes. Nathan Boerboom, a Fargo metropolis engineer and technical staff member, stated the price of constructing larger…

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