via via CCTA File /6 Train Avenue West and 70 Yonge Street South, Springwater Natural Hazard Study

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1 January 16, 217 via via CCTA File Vanessa Simpson, B.ID, M.PL. Junior Planner/ Planning Technician Innovative Planning Solutions 1 Dunlop Street East, Suite 21 Barrie, Ontario L4M 1B2 Re: /6 Train Avenue West and 7 Yonge Street South, Springwater Natural Hazard Study Dear Vanessa: C. C. Tatham & Associates Ltd. (CCTA) has been retained by Innovative Planning Solutions on behalf of Louis Nitsopoulos to complete a natural hazard study for & 6 Train Avenue West and 7 Yonge Street South, in the Township of Springwater. The majority of the subject site is located in an area regulated by the Nottawasaga Valley Conservation Authority (NVCA), as the Wye River defines the southern property line of Train Avenue West and 7 Yonge Street South, and bisects 6 Train Avenue West. The purpose of this natural hazard study is to determine the limits of the flood and erosion hazards associated with the Wye River, in order to define the developable area on the subject site. This study has been prepared in support of future site plan application. Existing Conditions The area of the three lots totals to 4.47 ha. The Wye River defines the southern property line of Train Avenue West and 7 Yonge Street South, and bisects 6 Train Avenue West. The Wye River flows northerly across the subject site, eventually draining into Georgian Bay in Midland. In November 216, Rudy Mak Surveyors completed a detailed topographic survey of the subject site. Guidelines & Background Documents The natural hazard analysis was completed recognizing applicable Provincial and Conservation Authority guidelines on hydrologic and hydraulic analysis and design standards for watercourse crossings as follows:

2 Technical Guide - River and Stream Systems: Flooding Hazard Limit (Provincial Policy Statement 3.1), Ministry of Natural Resources (21); and NVCA Natural Hazards Technical Guide, NVCA (December 213). Existing Condition Hydraulic Analysis As noted above, the Wye River defines the southern property line of Train Avenue West and 7 Yonge Street South, and bisects 6 Train Avenue West. The HEC-RAS hydraulic modelling software was used to determine the existing condition Regulatory flood elevation across the site. NVCA s Generic Regulation HEC-RAS model was used as a starting point for the analysis. Existing cross sections and were updated to reflect the detailed topographic survey of the site. Four additional cross sections ( , , 693, and ) were created to better reflect the detailed topographic survey data. The cross sections used in the hydraulic analysis are shown on the enclosed Drawing FLD-1. A Manning s roughness coefficient n of. was selected for the main channel based on a winding channel with some weeds and stones. A roughness coefficient of was selected from Table 3-1 of the HEC-RAS Reference Manual for the right and left overbank areas based on the presence of light brush and trees under summer conditions. The existing conditions Regulatory flood elevations in the vicinity of the site are shown on the attached Drawing FLD-1. The results of the HEC-RAS hydraulic model are summarized in Table 1, with full results provided in Attachment A. For the purpose of this study, the NVCA Regulatory peak flow provided in their HEC-RAS model has been used to determine the floodplain limits. Table 1: HEC-RAS Hydraulic Model Water Surface Elevations River Reach Cross Section ID Existing Condition Regulatory Flood WYE WYE WYE WYE WYE WYE WYE The Regulatory flood elevations obtained from the HEC-RAS model were used to delineate a Regulatory flood line that is shown on Drawing FLD-1. Vanessa Simpson, B.ID, M.PL. Innovative Planning Solutions Page 2 of 3 January 16, 217

3 The meander belt width has also been delineated on Drawing FLD-1. In accordance with the Ministry of Natural Resources (MNR) Natural Hazard Technical Guide, an allowance of twenty-times bankfull width was applied from the meander axis of the Wye River to estimate the meander belt width. This results in a setback of m across the subject site. Conclusion Based on the Regulatory flood elevation across the site, approximately 2.47 ha of the total 4.47 ha site is considered to be developable. It should be noted that based on our preliminary meander belt hazard assessment, which provides a conservative estimate of the meander belt extent, a large majority of the subject property is located within the meander belt. We anticipate that the meander belt width could be reduced through additional study completed by a fluvial geomorphologist. If you have any questions or concerns, please do not hesitate to contact the undersigned. Yours truly, C. C. Tatham & Associates Ltd. Yours truly, C.C. Tatham & Associates Ltd. Nicole Foris, B.A.Sc., EIT Intern Engineer ALK/NHF:klc Amanda Kellett, B.Sc.Eng, P.Eng. Project Manager T:\216 PROJECTS\ & 6 Train Ave. & 7 Yonge St. S - Natural Hazard Study\Documents\Letters\L - NVCA1 - &6 Train Ave West & 7 Yonge St - Natural Hazard Study Brief.doc Vanessa Simpson, B.ID, M.PL. Innovative Planning Solutions Page 3 of 3 January 16, 217

4 HEC-RAS Plan: CCTA Ex. River: WYE Reach: 3 Profile: PF 1 Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (m3/s) (m) (m) (m) (m) (m/m) (m/s) (m2) (m) PF PF PF PF PF PF PF PF PF PF PF PF PF Bridge PF PF PF PF PF PF PF PF PF PF Bridge PF PF PF PF PF PF PF PF PF PF

5 216 WYE 3 Left Levee Right Levee Main Channel Distance (m)

6 RS = Updated by CCTA per Lot 6 Concession 8 Survey (Rudy Mak, Nov 21. Ineff RS = New CCTA XS per Lot 6 Concession 8 Survey (Rudy Mak, Nov 216)

7 216 RS = New CCTA XS per Lot 6 Concession 8 Survey (Rudy Mak, Nov 216) RS = Updated by CCTA per Lot 6 Concession 8 Survey (Rudy Mak, Nov

8 216 RS = 693 New CCTA XS per Lot 6 Concession 8 Survey (Rudy Mak, Nov 216) RS = New CCTA XS per Lot 6 Concession 8 Survey (Rudy Mak, Nov 216)

9 216 RS =

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