Draft VALLEY CITY 100 YEAR EVENT FLOOD PROTECTION. Citywide Planning Report Valley City, ND. December 2016

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1 VALLEY CITY 100 YEAR EVENT FLOOD PROTECTION Citywide Planning Report Valley City, ND Prepared for: City of Valley City Valley City, ND Revised December 2016 Project # NATIONAL PERSPECTIVE REGIONAL EXPERTISE TRUSTED ADVISOR

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3 CONTENTS Executive Summary... 1 Executive Summary... 1 Project Background... 2 Previous Floods... 2 Community/Public Input Comments... 3 Geotechnical Recommendations... 3 URS Erosion Study... 4 Hydraulic Criteria... 4 Benefit Cost Matrix... 5 Protection Districts... 6 Descriptions... 6 Chautauqua Loop District... 6 Swanke District Downtown District Tributary A District Valley Avenue District University District th Avenue District Riverview District Woodland District Priority list i P age

4 TABLES Table 1: Historical Flood Events Stage USGS Gage... 2 Table 2: Community Planning Meetings Public Input Feedback... 3 Table 3: Chautauqua Loop District Summary... 7 Table 4: Swanke District Summary Table 5: Downtown District Summary Table 6: Tributary A District Alternate Summary Table 7: Valley Avenue District Summary Table 8: University District Summary Table 9: 8th Avenue District Summary Table 10: Riverview District Summary Table 11: Woodland District Summary Table 12: BCM Ranking By District Table 13: Construction Phasing Cost By District Segments LIST OF APPENDICES Appendix A: District Map Appendix B: Geotech Location map and Stability Analysis Appendix C: Cost Estimates Base Design Appendix D: Cost Estimates Alternatives Appendix E: Compiled Buyout Lists ii P age

5 EXECUTIVE SUMMARY Executive Summary Valley City sits along the Sheyenne River and is prone to flooding events which impacts the community both economically and socially. Fighting each flood is not a long term feasible option since the effects of an emergency response results in long term damages which takes the community years to recovery from economically. The total emergency measures for a 100year flood event within Valley City requires an estimated 380,000 sand bags and 180,000 cu.yd. of clay. Emergency responses take millions of dollars to fight any given flood event, but socially the cost impacts continue to accrue years after the flood waters have receded. What person or business wants to invest in the community knowing their investment could be wiped out in the next flood event. This mind set contributes to stagnant growth and long term negative economic impacts. A smarter approach is to build a positive community outlook and a confidence factor that a permanent flood protection plan provides. In order to mitigate these disruptions to the community, KLJ has been directed by the City of Valley City to work with the Valley City Flood Task Force (FTF) to develop options and alternatives to implement permanent flood protection. For this purpose of assisting the FTF in developing a plan for permanent flood protection, the area of protection has been outlined in multiple districts with the first phase centered near Valley City State University (VCSU). This area, which is substantially complete in construction, is identified as the University District. Other portions of the City have been identified by districts for the permanent flood protection planning purposes. This report will identify affected neighborhoods of the City as identified by district, discuss flood protection options for each district and outline the construction impacts of each segment alternative. As each district is discussed, a cost benefit matrix will be provided for the Flood Task Force committee s consideration. To assist the Flood Task Force committee in deciding on a permanent flood protection measure, technical and community meeting feedback considerations will be outlined in this report. 1 P age Citywide Planning Report City of Valley City December 2016

6 PROJECT BACKGROUND Previous Floods Valley City has experienced severe floods in the past with the most recently being; 1996, 1997, 2009 and The following is a list of flood events and staging elevations as they relate to USGS Gage (Station No ) located just below Little Dam on the Sheyenne River. TABLE 1: HISTORICAL FLOOD EVENTS STAGE USGS GAGE Year Water Surface Elev. (Gage ht.) Recurrence Interval (year) Note Previous Record (127 years) New Record Set *GAGE ZERO = NAVD88 2 P age Citywide Planning Report City of Valley City December 2016

7 Community/Public Input Comments Community public comment meetings were conducted by KLJ in coordination with the FTF. The meetings were broken down into neighborhoods, and discussed some of the preliminary design considerations and measures analyzed for each neighborhood. These neighborhood meetings discussed the need for permanent flood protection. Its impact on flood insurance rates, general alignment and design criteria of various flood protection measures. Clay levees, floodwalls and specialty wall site requirements were addressed as they relate to setbacks, construction footprint, and protection elevations. A No Change option was also presented to each neighborhood. A total of 77 comments were received (written and ed) and are available at the office of KLJ. Many of the comments shared common themes and are summarized below: How do we address the loss of housing? Please keep the number home buyouts low. Permanent flood protection is essential. Prefer to stay, no buyout. Loss of trees and viewscape will change Valley City with flood protection. Floodwalls over clay levees to save more homes. Is comparable replacement housing available? Preserve businesses in the community. How do we address internal flooding caused by the dikes? Prefer a buyout. Please address riverbank erosion. TABLE 2: COMMUNITY PLANNING MEETINGS PUBLIC INPUT FEEDBACK District Date Location/Notes No. Attendees November 12, Kickoff Meeting Eagles Club No record 2015 Regional Technology Neighborhood A January 14, Center Neighborhood B January 21, 2016 Eagles Club 45 analysis. of the borings and the stability Neighborhood C January 28, 2016 Eagles Club 12 Neighborhood D January 28, 2016 Eagles Club 21 Neighborhood E & F February 4, 2016 Regional Technology Center 21 Geotechnical Recommendations Braun Intertec has conducted geotechnical investigations along protection areas of the Sheyenne River. Fifteen borings were conducted across the community. Appendix B includes a location map 3 P age Citywide Planning Report City of Valley City December 2016

8 The future project will meet minimum design, operation and maintenance standards required to certify the flood protection system in accordance with Section of the National Flood Insurance Program (NFIP) regulations for existing levees. The levees will be constructed in accordance with standards listed in the US Army Corps of Engineers April 2000 Design and Construction of Levees Manual EM , cited by FEMA as an appropriate reference for levee certification. The following design recommendations allow for factors of safety equal to or exceeds the DHSFEMA minimums and meets the geotechnical specific DHSFEMS provisions for Riverine Structures. A summary of these recommendations are as follows: Floodwall and levee foundation subgrades are stripped of vegetation and topsoil. Backfill and additional required fill are spread in 6 to 12inch lifts at moisture contents between zero and four percentage points above their optimum moisture contents, and compacted to at least 95 percent of their maximum standard Proctor dry densities. Backfill and fill are benched into slopes not steeper than 4:1 (horizontal:vertical). Levees are overbuilt at least ½foot to accommodate postconstruction settlement and maintained the intended amount of vertical clearance above the design flood elevation. Floodwall and levee foundation subgrades are evaluated by a geotechnical engineer to determine that the exposed soils are as anticipated and capable of supporting backfill and fill. URS Erosion Study In October 2013, URS conducted a Comprehensive Bank Stability and Restoration Study on the Sheyenne River for the City of Valley City. Areas within the city limits with erosion concerns were identified. Areas prone to bank instability as outlined in this report were assessed in the district flood protection recommendations. This document is available at City Hall. Hydraulic Criteria The Sheyenne River FEMA HECRAS model, as developed by the US Army Corps of Engineers (USACE) and calibrated by KLJ in 2012, was the starting point for the development options investigated by KLJ staff. The hydraulic analysis spans approximately 5.5 miles of the Sheyenne River from the North Valley Bridge, (County Highway 21) near the northern city limits, through Valley City, ND to south of Interstate 94 at the southerly city limits of Valley City, ND. The full hydraulic model used in this study included the Sheyenne River from Baldhill Dam to Lisbon, ND. The center of the study is the full reach of the Sheyenne River within city limits. This document is available at City Hall. The calibrated HECRAS model was used to run scenarios. These scenarios looked at a multitude of potential flood protection alignments throughout the City. These alignment scenarios will be outlined within this report under the applicable districts discussions. 4 P age Citywide Planning Report City of Valley City December 2016

9 One model outline item to note is all references to raises/reductions in flood elevation in this report are based on the FEMA 100year storm event. More accurately referred to in statistics as the 1% annual chance event. The effect permanent flood protection has on the 100year base flood elevation was also modeled. The permanent flood protection will raise the 100year base flood elevation through encroachments within the floodway and produces a higher base flood elevation than that cited by FEMA FIRM Maps. This higher base flood elevation is referred to in this report as the Adjusted 100year Floodplain. All flood protection limits reference the Adjusted 100year flood elevation. Benefit Cost Matrix A benefit versus cost comparison was examined for each of flood protection districts. The value of the properties was taken directly form the Valley City Assessors Website. The Benefit Cost Matrix (BCM), was calculated as: & BCM DEFINITIONS HOME: Residential Home Occupied by Owner. BUSINESS: Commercial Business Property to include Rental, Office, Industrial, Apartment Buildings and Rental Properties. ASSESSED VALUE: As Recorded on the Valley City Assessor Website for PROTECTED: Properties that are Located within the Adjusted 100year Floodplain. TOTAL COST: All Associated Cost to Build the Project as Listed in the Cost Estimates in Appendix C. 5 P age Citywide Planning Report City of Valley City December 2016

10 PROTECTION DISTRICTS Descriptions There are a total of nine districts identified for consideration in a prioritizing scheduling and funding of permanent flood protection by Valley City Flood Task Force. These districts are identified and shown in Appendix A. Chautauqua Loop District Base Plan Chautauqua Loop District is a residential area in northern Valley City that includes Chautauqua Park. The Chautauqua Loop District has 36 homes located within the 100year floodplain. The first segment is a clay levee which runs from the north end of Valley City near the junction of 6 th Avenue NE and Chautauqua Boulevard and runs east for a short distance along the southerly bank of the Sheyenne River. Here it where it transitions to a specialty wall for the remainder of the alignment running along the southerly bank of the Sheyenne River. As the alignment turns south, the specialty wall then transitions back to a clay levee where it runs south along the west side of Chautauqua Park. The clay levee transitions to a specialty wall as it crosses 12 th Avenue NE to a point on the river side. The specialty wall will continue westerly towards Chautauqua Boulevard along the south side of 12 th Street NE. Then south along the east side of Chautauqua Boulevard to the 1000 block. The components of this project scope includes: 1,100ft of clay levee, 1,530ft of specialty wall, 80ft of road closure, one storm pump lift station and storm sewer modifications. The permanent flood protection facility will cause a FEMA base flood elevation increase of approximately 2.5 feet. The important thing to look at in this case is the increase in flood elevation would be no different than any of the previous floods efforts where emergency measures were implemented. The only other alternative is if Valley City never takes action in fighting a flood event, which isn t likely to happen. Hydraulically, whether the permanent flood protection is a clay levee or a floodwall there is no benefit of one over the other. The Chautauqua Loop District preliminary project cost is estimated at $9.8 Million. Project construction is estimated at $7.2 Million. The number of homes protected by this project is 36. These homes have a combined total around $6.2 Million in value. The alignment would require buyouts of 1 home at a cost of $358,000. The cost benefit ratio stands at The impacts to homes & businesses along the Chautauqua Loop District are outlined in the following table. 6 P age Citywide Planning Report City of Valley City December 2016

11 TABLE 3: CHAUTAUQUA LOOP DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $9.8 Million* $6.2 Million 0.63 *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES 7 P age Citywide Planning Report City of Valley City December 2016

12 CHAUTAUQUA LOOP SEGMENTS 8 P age Citywide Planning Report City of Valley City December 2016

13 Chautauqua Loop Alternatives Alternatives for Chautauqua Loop District are shown in the following map. Alternative A The first alternative for the Chautauqua Loop District replaces 527ft of clay levee with 610ft of floodwall to protect house th Ave NE at an additional cost of $2.2 Million. Alternative B The second alternative for the Chautauqua Loop District replaces 690 ft of floodwall with 640ft of clay levee and remove houses 1430, 1416, 1400 & 1350 Chautauqua Boulevard at a cost savings of $700,000. Hydraulically this Alternative has no comparable benefit over the base plan described above. 9 P age Citywide Planning Report City of Valley City December 2016

14 CHAUTAUQUA LOOP ALTERNATIVES 10 P age Citywide Planning Report City of Valley City December 2016

15 Swanke District Base Plan Swanke District is a residential area and includes several fairways at the Valley City Country Club in northeast Valley City. The Swanke District has 32 homes located within the 100year floodplain. The Swanke District permanent flood protection will begin with a clay levee starting at the most northeasterly lot of the Swanke District and running 515ft west along the southerly bank of the Sheyenne River where it will transition to a specialty wall. The specialty wall will follow the southerly bank to a point where the alignment turns south. Here a clay levee will run south behind the homes along 9 th Avenue NE and then transition back to a specialty wall behind th Avenue NE. The specialty wall will wrap around this house and transition back to a clay levee alignment following the eastern side of the Sheyenne River. Before the alignment crosses 6 th Street NE, the clay levee will transition to a specialty wall before it crosses 6 th Street NE and continues south of the bridge. The specialty wall will transition back to a clay levee as it follows the north bank of the Sheyenne River before ending near the Bridgeview Apartments parking lot nearest the river. The components of this projects scope include: 2,540ft of clay levee, 2,050ft of floodwall, 120ft of road closure, two storm pump lift stations, a sanitary lift station, storm sewer, sanitary sewer and watermain. The permanent flood protection facility will cause a FEMA base flood elevation increase of approximately 2.5 feet. The important thing to look at in this case is the increase in flood elevation would be no different than any of the previous floods efforts where emergency measures were implemented. The only other alternative is if Valley City never takes action in fighting a flood event, which isn t likely to happen. Hydraulically, whether the permanent flood protection is a clay levee or a floodwall there is no benefit of one over the other. The Swanke District preliminary project cost is estimated at $16.4 Million. Project construction is estimated at $12.2 Million. The number of homes protected by this project are 31. These homes have a combined total around $7.9 Million in value. The alignment would require buyout of 2 home at a cost of $460,000. The cost benefit ratio stands at The impacts to homes & businesses along the Swanke District are outlined in the following table. TABLE 4: SWANKE DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $16.4 Million* ** $7.9 Million 0.48 *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES **GOLF COURSE PROPERTY IS PROTECTED & IMPACTED IN THIS ALIGNMENT 11 P age Citywide Planning Report City of Valley City December 2016

16 SWANKE DISTRICT SEGMENTS 12 P age Citywide Planning Report City of Valley City December 2016

17 Swanke District Alternatives Alternatives for Swanke District are shown in the following map. Alternative A The first alternative for the Swanke District replaces 425ft of floodwall with 385ft of clay levee with the removal of house th Avenue NE at a cost savings of $690,000. Alternative B The second alternative replaces 685ft of floodwall with 750ft of clay levee with the removal of houses 927 & th Street NE at a cost savings of $2.0 Million. Alternative C The third alternative replaces 370ft of floodwall with 360ft of clay levee with the removal of house th Street NE at a cost savings of $170,000. Hydraulically these Alternative has no comparable benefit over the base plan described above. 13 P age Citywide Planning Report City of Valley City December 2016

18 SWANKE DISTRICT ALTERNATIVES 14 P age Citywide Planning Report City of Valley City December 2016

19 Downtown District Base Plan The Downtown District encompasses the downtown business district and various residential neighborhoods east and south of downtown. This area also includes the critical infrastructure of the Power Transfer Station and the Sanitary Sewer Trunk Main. The Downtown District permanent flood protection will begin with a specialty wall fronting the 1000 block of Chautauqua Boulevard and running south on the east side of Chautauqua Boulevard. The alignment continues to follow the west bank of the Sheyenne River and transitions to a clay levee at the 800 block just north of the 8 th Avenue NE. The clay levee continues south along the east side of 8 th Avenue NE. It transitions back to a specialty wall as it crosses 6 th Avenue NE. Continuing south on the east side of Mercy Hospital it transitions back to a clay levee and continues south on the west bank of the Sheyenne River. The alignment runs south along the river side of 8 th Avenue NE. The clay levee transitions to a floodwall to protect two houses on 4 th Street NE and transitions back to a clay levee with a hydraulic cut off wall as it follows the Sheyenne River east of 9 th Avenue NE. The hydraulic cut off wall will transition to a full height clay levee at the roadway bend where 9 th Avenue NE meets 2 nd Street NE. The clay levee will run west of the storm lift station to meet up with the railroad grade north of the Tourist Park. The railroad grade will be replaced by a permanent clay levee and run west towards 6 th Avenue NE. The alignment turns south at the junction with 6 th Avenue SE where the alignment transitions to a specialty wall and crosses East Main Street to meet up with the northerly bank of the Sheyenne River. From here, the specialty wall continues west past 5 th Avenue SE Bridge and follows the Sheyenne River Bank westerly towards the Valley City Power House. The alignment continues along the Sheyenne River bank were it approaches 4 th Avenue SE and transitions to a clay levee going south along the east side of 4 th Avenue SE before turning south towards the old mill facility. Near 4 th Street SE, the clay levee transitions to a concrete floodwall as it turns westerly following the Sheyenne River south of 4 th Street NE. The concrete floodwall continues west crossing 3 rd Avenue SE to a point on the southwest side of the Valley City Recreation Center. Here the alignment crosses 4 th Street SW and runs north along the west side of 2 nd Avenue SE, west of the Valley City Recreation building. The alignment continues north to 2 nd Street SW. On the north side, the floodwall turns into a specialty wall as it passes the former Elks Building along the river bend at West Main Street and curves westerly back down the northerly/westerly bank of the Sheyenne River ending at approximately the intersection of 5 th Avenue SW & 2 nd Street SW near Bettin s Greenhouse & Flower Shop. The Downtown District permanent flood protection alignment is a combination of clay levees, permanent floodwalls, specialty floodwalls and road closures. The components of this projects scope include: 48,250ft of clay levee, 2,035ft of floodwall, 4,075ft sheeting floodwall, 400ft of road closure (5 total) and 4 storm pump lift stations. The permanent flood protection facility will cause a FEMA base flood elevation increase of approximately 2.5 feet at the northern end of the district and 1.2 feet at the southern end of the district. The important thing to look at in this case is the increase in flood elevation would be no different than any of the previous floods efforts where emergency measures were implemented. The only other alternative is if Valley City never takes action in fighting a flood event, which isn t 15 P age Citywide Planning Report City of Valley City December 2016

20 likely to happen. Hydraulically, whether the permanent flood protection is a clay levee or a floodwall there is no benefit of one over the other. The Downtown District preliminary project cost is estimated at $53.9 Million. Project construction is estimated at $37.5 Million. The number of homes and business protected by this project are 326 and 132 respectively. These homes and business have a combined total around $87.7 Million in value. The alignment would require buyouts of 29 homes and 12 business at a cost of $4.3 Million. The cost benefit ratio stands at This district is also the largest segment of the overall permanent flood protection. The impacts to homes & businesses along the Downtown District are outlined in the following table. TABLE 5: DOWNTOWN DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $53.9 Million* $87.7 Million 1.63 *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES 16 P age Citywide Planning Report City of Valley City December 2016

21 DOWNTOWN DISTRICT SEGMENTS 17 P age Citywide Planning Report City of Valley City December 2016

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25 Downtown District Alternatives Alternatives for Downtown District are shown in the following maps. Alternative A The first alternative considered for the Downtown District replaces 233ft of clay levee with 318ft of floodwall to protect houses 804 Chautauqua Boulevard at an additional cost of $1.1 Million. Alternative B The second alternative considered for the Downtown District was to route a wall east around the existing storm lift station at 2 nd Street NE, whereby protecting three additional houses to the north of the lift station. This options replaces 674 feet of clay levee and adds 674ft of floodwall to protect the storm lift station and houses 823 & nd Street NE and th Avenue NE at an additional cost of $ 825,000. Alternative C The third alternative considered for the Downtown District was to extend the wall further west to protect 3 houses just west of the Recreation Center. This options adds 486ft of floodwall to protect houses 206 & th Street SW and th Avenue SW at an additional cost of $ 843, P age Citywide Planning Report City of Valley City December 2016

26 DOWNTOWN DISTRICT ALTERNATIVES 22 P age Citywide Planning Report City of Valley City December 2016

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29 Tributary A District Base Plan The Tributary A District is composed of a separate FEMA study area entitled Tributary A. Tributary A is an unnamed creek that flows west coming into town from the east along East Main Street before connecting with the Sheyenne River system south of the Rainbow Bridge. This district contains a small residential neighborhood and various businesses. Locating a permanent flood protection for this neighborhood was investigated and results showed that 75% of the structures afforded flood protection were actually removed by the physical flood protection infrastructure. See Table 6 below. The base plan for the Tributary A District is to provide no permanent flood protection, however homeowners will be provided with the option for buyout on homes within the FEMA base flood elevation area. This would require 12 homes and 8 business buyouts at a cost of $3.7 Million. Emergency flood measures would require 5,488 cu.yd. of Clay Tributary A District Alternative Alternative A The alternative considered for the Tributary A District includes putting in a permanent flood protection system composed of clay levees, floodwalls and road closures. The alignment starts with a clay levee approximately 1,000 feet north of East Main Street, east of the Rainbow Bridge, at the abandoned railroad grade and runs south crossing East Main Street and follows the east bank of the Sheyenne River where it turns back east along the north bank of Tributary A. As the alignment approaches 11 th Avenue SW it will transition to a concrete floodwall to avoid FEMA Lots and across 11 th Ave SE were it then transitions back to a clay levee ending at 12th Avenue SE. The components of this projects scope includes: 1,590ft of clay levee, 175ft of floodwall, 160ft of road closure (2 total), a storm pump lift station and a sanitary lift station at an additional cost of $5.4 Million. The impacts to homes & businesses along the Tributary A District are outlined in the following table. TABLE 6: TRIBUTARY A DISTRICT ALTERNATE SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $5.4 Million* 9 6** 3 2 $913, *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES **RENTAL HOUSES ARE COUNTED AS BUSINESS IN THIS REPORT 25 P age Citywide Planning Report City of Valley City December 2016

30 TRIBUTARY A DISTRICT ALTERNATIVE 26 P age Citywide Planning Report City of Valley City December 2016

31 Valley Avenue District Base Plan Valley Avenue District encompasses a residential neighborhood. This district follows 3 rd Street SE along the southerly bank of the Sheyenne River. The alignment crosses 5 th Avenue on the south side of the 5 th Avenue Bridge and continues along the Sheyenne River bank west and southerly until intersecting the river embankment near the western edge of Valley Avenue were the elevation exceeds the FEMA Base Flood Elevation. The base plan for the Valley Avenue District is to provide no permanent flood protection, however homeowners will be provided with the option for buyout on homes within the FEMA base flood elevation area. This would apply to 10 homes and 8 business at a cost of $1.7 Million. Emergency flood measures would require 10,023 cu.yd. of clay. The impacts to homes & businesses along the Valley Avenue District are outlined in the following table. TABLE 7: VALLEY AVENUE DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $2.3 Million* N/A *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES Valley Avenue District Alternatives No alternatives for the Valley Avenue District permanent flood protection were considered feasible for analysis. 27 P age Citywide Planning Report City of Valley City December 2016

32 VALLEY AVENUE DISTRICT 28 P age Citywide Planning Report City of Valley City December 2016

33 University District Base Plan Phase 1 of this district is currently funded and scheduled for completion in Fall 2016 Phase 2 is the final segment at the east end forming the closure at the 3 rd Avenue Bridge to a tiein point along the east end of College Street. This phase requires the construction of 90ft of specialty wall and 140ft of road closure and streambank restoration. The University District Phase 2 preliminary project cost is $1.0 Million. Project construction is $0.8 Million. The number of homes and business protected by this project are 79 and 7 respectively. These homes and business have a combined total around $49.0 Million in value. The impacts to homes & businesses along the University District are outlined in the following table. TABLE 8: UNIVERSITY DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM $18.6 Million* ** $49.0 Million 2.63 *THIS DOES NOT REFLECTS BANK EROSION RESTORATION AND DAM WORK FOR THIS AREA **INCLUDES VALLEY CITY STATE UNIVERSITY University District Alternatives Homes Businesses Homes Businesses No alternatives are planned for the University District since this phase is planned and constructed. 29 P age Citywide Planning Report City of Valley City December 2016

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35 UNIVERSITY DISTRICT SEGMENT 31 P age Citywide Planning Report City of Valley City December 2016

36 8 th Avenue District Base Plan 8 th Avenue District encompasses the downtown business district along West Main Street, various residential neighborhoods and portions of the Valley City State University campus. This area also includes the critical infrastructure of the Master Lift Station and the Sanitary Sewer Trunk Main. The permanent flood protection will begin with a specialty wall at the intersection of 5 th Avenue SW & 2 nd Street SW and continuing south along the west bank of the Sheyenne River. The alignment crossing 4 th Street SW & West City Park Bridge continuing south along the river side of 6 th Avenue SW on the west bank of the Sheyenne River. The alignment crosses Viking Drive on the west side of Viking Drive Bridge were it transitions to a clay levee and follows the river south to a bend west near the Little Dam. Here the alignment transitions to a specialty wall and follows the northerly bank of the Sheyenne River, past the master lift station to the intersection with 8 th Avenue SW. The alignment crosses 8 th Avenue SW on the north side of the 8 th Avenue Bridge and transitions to a clay levee and traverses the VCSU softball fields. It transitions to a concrete floodwall along the south side of the Lokken Stadium tack. At the west end, the alignment runs south along the east side of 10 th Avenue SW. At the south terminus of 10 th Avenue SW near Riverside Gardens the floodwall transitions to a clay levee and the alignment turns westerly along the north bank of the Sheyenne River towards the NDDOT embankment at the northwest side of the Interstate 94 Bridge. The permanent flood protection facility will cause a FEMA base flood elevation increase of approximately 1.2 feet at the northern end of the district and 0.7 feet at the southern end of the district. The important thing to look at in this case is the increase in flood elevation would be no different than any of the previous floods efforts where emergency measures were implemented. The only other alternative is if Valley City never takes action in fighting a flood event, which isn t likely to happen. Hydraulically, whether the permanent flood protection is a clay levee or a floodwall there is no benefit of one over the other. The components of this projects scope includes: 3,350ft of clay levee, 880ft of floodwall, 2,360 ft of specialty wall, 280ft of road closure (3 total), and three storm pump lift stations. The 8th Avenue District preliminary project cost is estimated at $28.5 Million. Project construction is estimated at $19.3 Million. The number of homes and business protected by this project are 181 and 5 respectively. These homes and business have a combined total around $45.9 Million in value. The alignment would require buyouts of 12 homes and 6 business at a cost of $2.9 Million. The cost benefit ratio stands at The impacts to homes & businesses along the 8th Avenue District are outlined in the following table. 32 P age Citywide Planning Report City of Valley City December 2016

37 TABLE 9: 8TH AVENUE DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $28.5 Million* $45.9 Million 1.61 *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES 33 P age Citywide Planning Report City of Valley City December 2016

38 8 TH AVENUE DISTRICT SEGMENTS 34 P age Citywide Planning Report City of Valley City December 2016

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41 8 th Avenue District Alternatives Alternatives for 8 th Avenue District are shown in the maps in Appendix: C. Alternative A The first alternative for the 8 th Avenue District replaces 580ft of floodwall with 525ft of clay levee with the removal of houses; nd Avenue SW, 220 & th Avenue SW, and 514 & rd Street SW at a cost savings of $500,000. Alternative B The second alternative replaces 220ft of clay levee with 250ft of floodwall to protect houses; 567 Viking Drive and 715, 725, 737 & th Avenue SW at an additional cost of $410, P age Citywide Planning Report City of Valley City December 2016

42 8 TH AVENUE DISTRICT ALTERNATIVES 38 P age Citywide Planning Report City of Valley City December 2016

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44 Riverview District Base Plan The Riverview District encompasses a residential neighborhood in southern Valley City. This district is runs from southwest side of 8 th Avenue SW along the southerly bank of the Sheyenne River to the NDDOT embankment at northeast side of the Interstate 94 Bridge. Locating a permanent flood protection for this neighborhood was investigated and results showed that 90% of the structures afforded flood protection were actually removed by the physical flood protection infrastructure. See Figure below. The base plan for the Riverview District is to provide stream bank stabilization and no permanent flood protection. Emergency flood measures would require 196,800 sand bags and 7,479 cu.yd. of Clay. The stream bank stabilization project cost is estimated at $1.1 Million. Project construction is estimated at $830,000. The Riverview District project requires the optional buyout of 4 homes in the FEMA base flood elevation area at a cost of $900,000. The impacts to homes & businesses along the Riverview District are outlined in the following table. TABLE 10: RIVERVIEW DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $2.0 Million* 4 0 N/A N/A N/A *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES 40 P age Citywide Planning Report City of Valley City December 2016

45 RIVERVIEW DISTRICT 41 P age Citywide Planning Report City of Valley City December 2016

46 Woodland District Base Plan The Woodland District encompasses one business and a small residential neighborhood on the southern edge of Valley City. The base plan for the Woodland District is to provide no permanent flood protection, however homeowners will be provided with the option for buyout on homes within the FEMA base flood elevation area. This would apply to 10 homes and 1 business at a cost of $2.1 Million. Emergency flood measures would require 13,834 cu.yd. of Clay. Woodland District Alternative Alternative A The alternative considered for the Woodland District includes putting in a permanent flood protection system composed of a clay levee at the southeast Interstate 94 Bridge embankment runs along the east bank of the Sheyenne River south and transitioning to a floodwall behind the most northwesterly house on Woodland Park Drive. The floodwall continues south along the Sheyenne River to a point south of Woodland Park Drive. The floodwall will transition to a clay levee south and east of Woodland Park Drive. The components of this projects scope includes: 1,850ft of clay levee, 1,310ft of specialty wall, 60ft of road closure (1 total), and one storm pump lift stations. The base plan for the Woodland District preliminary project cost is estimated at $8.8 Million. Project construction is estimated at $6.7 Million. The number of homes and business protected by this project are 10 and 1 respectively. These homes and business have a combined total around $2.1 Million in value. The alignment would require buyouts of 0 home and 1 business at a cost of $63,000. The cost benefit ratio stands at The hydraulic analysis with placement of permanent flood protection within the Woodland District was investigated. Placing permanent flood protection along this section of the Sheyenne River resulted in a 0.30ft raise in the base flood elevation upstream through Valley City. The impacts to homes & businesses along the Woodland District are outlined in the following table. TABLE 11: WOODLAND DISTRICT SUMMARY Total Project Cost Buyout Protected Protected Value BCM Homes Businesses Homes Businesses $8.8 Million* $2.1 Million 0.24 *THIS COST REFLECTS CONSTRUCTION/DEMOLITION REMOVAL OF BUYOUT HOMES/BUSINESSES 42 P age Citywide Planning Report City of Valley City December 2016

47 WOODLAND DISTRICT ALTERNATIVE Woodland District Alternatives Alternative A The alternative plan for the permanent flood protection within the Woodland District is to No Change with erosion protection. This alternative requires the buyout of all houses in the FEMA base flood elevation area. Potentially 10 homes and 2 business buyouts at a cost of $4.6 Million. 43 P age Citywide Planning Report City of Valley City December 2016

48 PRIORITY LIST All districts listed in this report were ranked by BCM as outlined in Benefit Cost Matrix Section of this report. The table below lists the priority and the associated BCM. TABLE 12: BCM RANKING BY DISTRICT District BCM University 2.63 Downtown th Avenue 1.61 Chautauqua Loop 0.63 Swanke 0.48 Woodland * Tributary A * Riverview * Valley Avenue * *OPTIONAL BUYOUTS As shown above, the Downtown District and 8 th Avenue District are statistically tied in their BCM rankings after the University District. The Flood Task Force has elected to prioritize the Downtown District due to factors not included in the BCM formula, primarily the economic business aspects. During the flooding event of 2009, Main Street was closed, causing considerable damage to the downtown businesses and the economic impact was significant. Construction of the Downtown District will protect 120 businesses. The priority list in Table 13 breaks down costs for subsections to be constructed in fund allotments of $20 Million per year. These cost are assumed to be in 2016 dollars. Given the current financial situation at the State level, the future funding timelines may change significantly. 44 P age Citywide Planning Report City of Valley City December 2016

49 TABLE 13: CONSTRUCTION PHASING COST BY DISTRICT SEGMENTS Phase DistrictSegment Buyouts Buyout Costs Project Costs Current Cost Running Total Lengt h Description % District Protected $ 5,530,000 $ 14,244,500 $ 19,774,500 $ 19,774,500 4,281 95% 95% University $ 5,746,920 $ 12,847,333 $ 13,756,333 $ 33,530,833 1,815 17% Downtown 17% Downtown Downtown14 3 $ 819,600 $ 11,638,593 $ 12,458,193 1,615 Specialty Wall Along Main St Downtown10 1 $ 89,400 $ 1,208,740 $ 1,298, Specialty Wall Behind Power House Additional Buyouts 20 $ 4,837,920 $ $ $ 1,316,800 $ $ 1,316,800 $ 34,847,633 Next Phase Buyouts Only 10 $ 1,316, $ $ 21,482,628 $ 38,090,928 $ 72,938,561 5,295 49% Downtown 65% Downtown Downtown7 0 $ $ 2,495,406 $ 2,853, Clay from 3rd to Railroad embankment Downtown8 0 $ $ 884,758 $ 884, Replace Clay railroad embankment on Main Downtown9 0 $ $ 3,124,548 $ 3,663, Specialty Wall From Powerhouse to RV Park Downtown11 0 $ $ 1,891,435 $ 1,891, Specialty Wall From Powerhouse to Public Works Downtown12 0 $ $ 963,430 $ 1,505,430 1,048 Clay from Public works south to Old mill Downtown13 0 $ $ 9,676,966 $ 10,602,366 2,054 Concrete Wall Along 4th St S and 2nd Ave SW University 0 $ $ 989,499 $ 15,233, Specialty Wall South of Old Mill 100% University Riverview Erosion 0 $ $ 1,082,302 $ 1,082,302 0 Riprap stream bank Woodland Erosion 0 $ $ 374,283 $ 374,283 0 Riprap stream bank $ 2,788,200 $ 19,429,952 $ 24,087,018 $ 97,025,579 3,776 35% Downtown 100% Downtown Downtown6 0 $ $ 4,234,672 $ 5,177, Clay 9th Ave NE 4th to 3rd Downtown5 0 $ $ 650,644 $ 650, Concrete Wall Behind houses 855 & 839 4th St NE Downtown4 4 $ 417,400 $ 568,720 $ 1,138, Clay east of hospital Downtown3 0 $ $ 3,196,531 $ 3,196, Specialty Wall Hospital Bridge Crossing Downtown2 1 $ 392,200 $ 1,017,102 $ 1,409, Clay along 8th Ave NE (north of hospital bridge) Downtown1 0 $ $ 7,182,062 $ 7,182,062 1,179 Specialty Wall on Chautauqua Blvd 8th Ave6 6 $ 1,332,800 $ 2,580,221 $ 4,687,087 2,173 Clay from Ball fields west until tied in 36% 8th Ave Additional Buyouts 7 $ 645,800 $ $ 645, P age Citywide Planning Report City of Valley City December 2016

50 $ 1,876,400 $ 21,723,235 $ 23,814,235 $120,839,814 3,923 64% 8th Ave 100% 8th Ave 8th Ave1 5 $ 474,800 $ 12,556,562 $ 13,031,362 1,569 Specialty Wall 6th Ave SW 8th Ave2 3 $ 461,600 $ 388,536 $ 1,064, Clay south of Viking Drive 8th Ave3 1 $ 810,000 $ 6,045,924 $ 6,855, Specialty Wall Master Lift past 8th Ave 8th Ave4 1 $ 130,000 $ 210,523 $ 340, Clay from 8th Ave to Ball Fields 8th Ave5 0 $ $ 2,521,691 $ 2,521, Concrete Wall around Ball Fields Additional Buyouts 4 $ 889,000 $ $ 889,000 Optional Buyouts $ 388,000 $ 9,387,607 $ 9,775,607 $130,615,421 1,941 Chautauqua Loop2 0 $ $ 3,738,648 $ 3,738, Specialty Wall along 12th St NE Chautauqua Loop1 1 $ 388,000 $ 5,648,959 $ 6,036,959 1,195 Replace Clay in park north to tie in $ 518,200 $ 15,844,783 $ 16,362,983 $146,978,404 4,239 38% Chautauqua Loop 100% Chautauqua Loop Swanke 2 $ 518,200 $ 15,844,783 $ 16,362,983 4,239 Clay and Concrete Wall 100% Swanke * Optional Buyouts 48 $ 9,397,000 $ $ $156,375,404 0 Valley Avenue 17 $ 2,182,200 Riverview Drive 4 $ 1,009,000 Woodland 13 $ 4,638,200 Tributary A 14 $ 1,567,600 Mill Dam Project Mill Dam Erosion $ $ 1,500,000 $ 1,500,000 0 Repair/replace Mill Dam and erosion *Optional Buyouts. Area will not have permanent flood protection, but be protected by emergency measures. 46 P age Citywide Planning Report City of Valley City December 2016

51 FLOOD TASK FORCE MEMBERS Dewey Magnuson, City Commission Matt Pedersen, City Commission David Schelkoph, City Administrator John Froelich, County Commission Cindy Schwehr, County Commission Rich Scheuneman, Valley City School Board Tyler Jacobson, Valley City Parks Mary Lee Nielson, Community Member Keith Hovland, Community Member George Gaukler, Community Member Jennifer Feist, VCBC Development Corporation Larry Robinson, Valley City State University 47 P age Citywide Planning Report City of Valley City December 2016

52

53 APPENDIX A: DISTRICT MAP

54

55 Flood Protection Districts ~ Valley City, ND 15TH ST NE 13TH ST NE 5TH AVE NE 10TH AV E NE 12 1/2 AVE SW 12TH AVE NE 10TH AVE SE 9TH AVE SE 8TH AVE SE 12TH AVE NE 11TH AVE SE 8TH AVE SE 7TH AVE SE D 7TH AVE NE ft 4TH AVE NW 5TH AVE SW ra 2ND AVE SW 8TH AVE NW 11TH AVE SW AV E 9TH AVE SE 8TH AVE SE 2ND AVE SE 4TH AVE SW 13TH AVE SW 11TH AVE SW T SW T SE 12TH AVE SE T SE 11TH AVE SE S 10TH S 10TH S 8TH 4TH AVE SE DR OW E SW V RI EW VI ER W 10TH ST SE Riverview District WOODLAND PARK 14TH ST SW Woodland District 8th Ave District University District Chautauqua Loop District Remaining University District Downtown District Valley Avenue District Swanke District Woodland District River View District Tributary A District Valley City City Limits ,000 $ 14TH AVE SW 5TH ST SE EY W 11TH ST SW S AVE 5TH 9 1/2 ST SW SH TER WIN E RD S AV 2ND 15TH AVE SW VAL L Remaining University District SW 8th Ave District S AVE 16 1/2 AVE SW Valley Avenue District 7 1/2 ST SW 8TH 17TH AVE SW 2ND ST SE 3RD ST SE ST SE SW VIKING DR Tributary A District 9TH AVE SE 4TH AVE SE COLLEGE COLLEGE ST SW E AV 16TH AVE SW 17 1/2 AVE SW 4TH AVE NE 4TH ST SE University District 6TH ST SW 9TH ST SW 10TH ST SW 3RD AVE SE 2ND ST SW H 6T VIKING DR 3RD AVE NE 7TH AVE SW 9TH AVE SW 5 1/2 ST SW Downtown District MAIN ST E 5TH ST SW 10TH AVE SW N SW 12TH AV E I MA W ST 3RD ST NE 2ND ST NE 4TH ST SW 5TH ST SW 5TH ST NE 5TH ST NE 4TH ST NE 2ND AVE SE 10TH AVE NW 3RD ST SW CENTRAL AVE N 3RD AVE NW 7TH AVE NW 4TH ST NW 2ND ST NW Swanke District 6TH ST NE 5TH ST NW 3RD ST NW D 7TH ST NE 2ND AVE NE 6TH AVE NW 6TH ST NW 8TH ST SE 8TH ST NE 8TH AVE NE 7TH ST NW 4TH AVE NE 8T NE 2ND AVE NW E NW 9TH AVE NW 8TH AVE NW 8 1/2 AV 8TH ST NW T HS 9TH ST NE CHAUTA U 9TH ST NE 9TH ST NW 9TH ST NW QUA B LV 10TH ST NW 10TH ST NE 6TH AVE NE W NW 7TH AVE NW AVE N 10TH ST 11TH ST NW 5TH 11TH ST NW 12TH ST NE 12TH ST NW 8TH AVE NE 3RD AV SECARSE DR 11 1/2 ST NW Chautauqua Loop District 9TH AVE NE E NE COURT A T NW 4TH AV E 2ND AVE NE COURT B NE 3RD AVE NE COURT C Feet 2,000 N

56

57 APPENDIX B: GEOTECH LOCATION MAP AND STABILITY ANALYSIS

58 Geotechnical Exploration Locations ~ Valley City, ND 15TH ST NE 9TH AVE SE 12TH AVE NE 12 1/2 AVE SW 12TH AVE NE 11TH AVE SE 5TH ST SE AVE 10TH AVE SE 8TH AVE SE 7TH AVE SE 8TH AVE SE 2ND AVE SW 10TH AVE NE 9TH AVE NE 8TH AVE NE 6TH AVE NE 4TH AVE NW 5TH AVE SW D 7TH ST ST S W 2ND AVE SE 4TH AVE SW 10TH S 8TH ST S E 9TH AVE SE 10TH O R SH E 8TH AVE SE SE 10TH ST SE T SE 14TH ST SW A Geotechnical Boring Locations $ 11TH AVE SW LVD ra ft 8TH AVE NW 11TH AVE SW 13TH AVE SW WOO DLAND PARK VAL LE Y 12TH AVE SE 14TH AVE SW 3RD ST SE 11TH AVE SE 15TH AVE SW 2ND ST SE 4TH AVE SE 16 1/2 AVE SW AST06 9TH AVE SE 4TH AVE SE E WINT S W RD W 17TH AVE SW AST07 ST SE SW VIKING DR S AVE 2ND DR W W IE S AVE 5TH V RI V ER SW 17 1/2 AVE SW A AST04 SW 11TH ST SW ST01 AVE SW 4TH AVE NE 3RD AVE SE 2ND AVE SE CO LLEGE AST08 E AV 20TH AVE 8TH AVE NE 3RD AVE NE CENTRAL AVE N MAIN ST E CO LLEGE ST SW H 6T A AST14 ST12 A 3RD ST NE 4TH ST SE 5TH ST NE ST05 5TH ST NE 7 1/2 ST SW AST03 9 1/2 ST SW 3RD AVE NW 5TH ST SW AST11 6TH ST SW 8TH 10TH ST SW 2ND AVE NE 6TH AVE NW 7TH AVE SW SW 16TH AVE SW 18TH AVE SW 19TH AVE SW 9TH ST SW 6TH ST NE 2ND ST SW 8TH ST SE AST09 7TH ST NE 4TH ST NE 9TH ST NE 2ND ST NE AST10 4TH ST SW VIKING DR 14TH ST SW 4TH ST NW 7TH AVE NW 9TH AVE SW 3RD ST SW 10TH AVE SW 5 1/2 ST SW 8TH ST NE E 2ND AVE NW E NW W TN 2ND ST NW 10TH AVE NW ST 5TH ST NW 5TH ST SW 12TH AVE MA IN 6TH ST NW ST13A 4TH AVE NE 8TH AVE NW 8 1/2 AV 9TH AVE NW 3RD ST NW S 8TH 8TH ST NW 7TH ST NW 10TH ST NE 9TH ST NE 9TH ST NW 9TH ST NW AST02 U QU A B 7TH AVE NW 11TH ST NW 10TH ST NW NW NW AVE 10TH S T 5TH 11TH ST NW 12TH ST NE CHA UTA 11 1/2 ST NW 12TH ST NW 7TH AVE NE 12TH ST NW 13TH ST NE 5TH AVE NE SECARSE DR 3RD AVE N E COURT A 4TH AV E 2ND AVE NE CO URT B NE 3RD AVE NE CO URT C Valley City City Limits ,200 Feet 2,400 N

59 B : Preliminary Levee Analysis, Valley City, ND Structure Stability and Performance Location Factor of Safety A LongTerm Steady State Steady State Seepage, FEMA Flood Level "X" of River Bank (Feet) Location/ Offset of Flood Control Structures "X" of C/L of Levee/Floodwall (Feet) Offset of C/L of Levee/ Floodwall from River Bank (Feet) Section1Floodwall Section2N Section3LeveeNSetback Section3LeveeS Section4NFloodwall w/sheetpile Section4NFloodwall w/sheetpilesetback Section5WFloodwall w/sheetpile Section5WFloodwall w/sheetpilesetback Section6NFloodwall w/sheetpile Section6NFloodwall w/sheetpilesetback Section7NFloodwall w/sheetpile Section7NFloodwall w/sheetpilesetback Section8S Section8N Section9WFloodwall w/sheetpile Section9WFloodwall w/sheetpilesetback Section10 w/seepage Berm Section10 w/slurry Trench Section10 w/setback (90') Section10WFloodwall w/sheetpile Section Section12Levee Section13SWFloodwall w/sheetpile Section13SWFloodwall w/sheetpilesetback Section14Floodwall Section15WFloodwall w/sheetpile Section15WFloodwall w/sheetpilesetback Section16Levee (Most Coservative Soil Properties) Section16Levee (Least Coservative Soil Properties) A DHSFEMA Minimums per Riverine Structures Form and/or Provisions of USACE Engineer Manual EM : LongTerm SteadyState = 1.4, or 1.2 if residual properties are used. Flood Stage = 1.4 Background colors assigned to the geologic materials above match the colors/materials on the analytical cross sections. Deficient of FEMA Minimum Factor of Safety