04-18-2022 Agenda
Laserfiche
>
Public
>
Flood Sales Tax Committee
>
Agenda & Minutes
>
2022
>
04-18-2022 Agenda
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
4/26/2022 10:48:30 AM
Creation date
4/26/2022 10:48:22 AM
Metadata
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
123
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Download electronic document
View images
View plain text
<br /> CASS COUNTY ROADWAY 18 EXTENSION STUDY – CASS COUNTY, <br />ND <br /> <br />45 <br />7.4.2 DRAINAGE/FLOODING IMPACTS <br />7.4.2.1 EXISTING CONDITIONS <br />Local drainage and flooding have always been concerns in the Red River Valley, especially when <br />roadways are intended to be altered, such as in the alternatives presented in this report. Upstream of this <br />study area, throughout Richland and Cass Counties, the flooding generally originates from either the <br />Sheyenne River or the Wild Rice River. As the capacity of these rivers is exceeded, flood waters tend to <br />break out of the channel banks and flow overland, backing up behind roadways prior to overtopping and <br />continuing to flow from section to section in a northeasterly direction. <br /> <br />Using the existing hydraulic models created for the Fargo-Moorhead Area Diversion Project, existing <br />conditions flooding in the study area was reviewed. The model used for this study simulates 100-year <br />riverine flooding from the Sheyenne River and the Wild Rice River. Near the study site, water breaks out <br />of the west banks of the Sheyenne River and it flows overland to 52nd Street SE, west of the Norman <br />Lutheran Church. Water also breaks out of the Sheyenne River to the east as it cascades north and east <br />along 52nd Street SE. Further to the east, along the existing County Road 18, water breaks out of the <br />Wild Rice River and Drain 37 prior to overtopping County Road 18. Water also overtops County Road 18 <br />at the Wild Rice River structure. The existing conditions flooding was presented at the public meeting <br />and several residents concurred with the overall drainage patterns and overtopping representations. <br />7.4.2.2 PROPOSED CONDITIONS WITH ALTERNATIVES <br />From a flooding perspective, future design of County Road 18 should include a detailed hydraulic analysis <br />to minimize impacts from the project. For this study, no detailed design or analysis was conducted, <br />however, the previously created FM Diversion model (existing conditions) was used to simulate the <br />effects of the potential alternatives (A, B, and C) in the vicinity of the Norman Lutheran Church. Figure <br />22, Figure 23, andFigure 24 present the flooding extents and impacts for the various alternatives. <br />7.4.2.3 IMPACTS OF THE FARGO-MOORHEAD DIVERSION PROJECT <br />The FM Diversion Project will not affect the proposed extension of County Road 18 or the Sheyenne <br />River crossing near the Norman Lutheran Church. However, additional flooding depths are expected <br />during diversion operations for the current stretch of County Road 18 near the Wild Rice River. The <br />depth of this flooding is dependent on the frequency of event (50-year, 100-year, etc.), and based on <br />historic records the project will not have ever operated during the growing season. Figure 25 presents <br />expected existing conditions flooding for the 10-, 20-, and 100-year flood events, without the diversion <br />project, and Figure 26 presents flooding with the diversion in place and operating. <br />
The URL can be used to link to this page
Your browser does not support the video tag.