MEMO. Date: July 4, 2018 Pages: 3 CCTA File: To: Ted Kruska CCTA Via: . Laura Goetz & Amanda Kellett

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1 MEMO Date: July 4, 208 Pages: 3 CCTA File: 3583 To: Ted Kruska CCTA Via: From: Subject: Laura Goetz & Amanda Kellett Concession 7 Culvert Replacement Hydraulic Analysis C.C. Tatham & Associates Ltd. (CCTA) has completed a hydraulic analysis to determine an adequate size for the culvert replacement drainage ditch crossing of Concession 7, west of Sideroad 0, in Ramara Township. The primary objective of this design brief is to determine if the installation of a new culvert of the same size as the existing will convey the required 25-year storm flow, with no adverse effects. Background Information The existing crossing consists of a 2400 x 500 mm open bottom concrete box culvert. The contributing drainage area to this crossing is ha, as determined by the Ministry of Natural Resources and Forestry Ontario Flow Assessment Tool (OFAT). A schematic of the drainage area is provided as Figure. The crossing is located on Concession 7, which is classified as a Rural Arterial Collector Road by the Township. The existing culvert has a span of less than 6 m, and therefore should be able to convey the 25-year storm, as per the Ministry of Transportation and Communications (MTC) Design Flood Criteria, Directive B-00. Hydraulic Analysis A hydrologic model was developed using Visual OTTHYMO (VO5) hydrologic modelling software to determine the peak flows contributing to the crossing. The 4-hour Chicago (CHI) and 24-hour SCS design storm distributions for Orillia were modelled to evaluate the existing peak flows at the crossing. A summary of the results from this analysis are provided in Table, while detailed results are appended.

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4 Figure : Drainage Area Schematic MINISTRY OF NATURAL RESOURCES AND FORESTRY Ontario Flow Assessment Tools Concession 7 Concrete Bridge Drainage Area Map Notes: Drainage Area = ha CCTA File No Catchment 0 Area = ha CN # = Existing Culvert Location.3 0 km Scale: : 25,77 Projection: Web Mercator The Ontario Ministry of Natural Resources and Forestry shall not be liable in any way for the use of, or reliance upon, this map or any information on this map. This map should not be used for: navigation, a plan of survey, routes, nor locations. Queen's Printer for Ontario, 207 Imagery Copyright Notices: Ontario Ministry of Natural Resources and Forestry; NASA Landsat Program; First Base Solutions Inc.; Aéro-Photo (96) Inc.; DigitalGlobe Inc.; U.S. Geological Survey. Copyright for Ontario Parcel data is held by Queen s Printer for Ontario and its licensors and may not be reproduced without permission. Legend

5 CONCESSION 7 CULVERT REPLACEMENT EXISTING CONDITIONS Nashyd Route Pipe Duhyd Standhyd Route Channel Diverthyd Addhyd Route Reservoir Project: Concession 7 Culvert Replacement C.C. TATHAM & ASSOCIATES LTD. File No.: 3583 Consulting Engineers Subject: Otthymo Flow Schematic Date: Jun-8 Figure: 2

6 Project: Concession 7 Culvert Replacement File No.: 3583 Date: 6/0/208 Designed By: LG Checked By: ALK Subject: CN Calculator CONCESSION 7 CULVERT REPLACEMENT CURVE NUMBER, INITIAL ABSTRACTION & TIME TO PEAK CALCULATIONS CONDITIONS Catchment 0 Area ha Soil Series Soil Series Hydrologic Soil Group Soil Texture Runoff Coefficient Catchment Soil Characteristics Forest/Woodland WEIGHTED CN VALUE Pasture/Lawns Meadows Cultivated Impervious Wetland/Lakes/SWMF Type Area Percent Area Percent CN Area Percent CN Area Percent CN Area Percent CN Area Percent CN Area Percent CN lvs LOVERING CD Clay Loam or Clay ayc ATHERLEY C Clay Loam or Clay vasl VASEY AB Sand Loam #N/A #N/A #N/A #N/A 0 0 #N/A 0 #N/A 0 #N/A 0 #N/A 0 #N/A 0 #N/A 0 #N/A #N/A #N/A #N/A 0 0 #N/A 0 #N/A 0 #N/A 0 #N/A 0 #N/A 0 #N/A 0 Totals Average CN for Soil Type Time of Concentration Calculations Initial Abstraction 7.0 mm Wetlands 2 Woods 0 For Runoff Coefficients greater than 0.4 For Runoff Coefficients less than 0.4 Meadows 8 Cultivated Bransby-Williams Formula Airport Method Lawns 5 Impervious 2 Maximum Catchment Elevation m Maximum Catchment Elevation m Runoff Coefficient 0.28 Minimum Catchment Elevation 20.4 m Minimum Catchment Elevation 20.4 m Catchment length 2478 m Catchment length 2478 m Soil Series Catchment Slope.2% Catchment Slope % Landuse Type lvs ayc vasl 0 0 Catchment Area ha Catchment Area ha 3 3 #N/A #N/A Forest/Woodland #N/A #N/A Time of Concentration (Minutes) Time of Concentration (Minutes) Cultivated #N/A #N/A Time of Concentration (Hours).27 Time of Concentration (Hours) 2.07 Pasture/Lawn #N/A #N/A Time to Peak (2/3 x Time of Concentration) 0.85 Time to Peak (2/3 x Time of Concentration).38 Impervious #N/A #N/A Wetland/Lake/SWMF #N/A #N/A Time to Peak.38 hrs Time Step (/5 Tp) 6.59 mins Meadows #N/A #N/A Soil Series Total #N/A #N/A CN Calculator.xls C.C. Tatham Associates Ltd. 7/4/208

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12 HY-8 Culvert Analysis Report Table - Summary of Culvert Flows at Crossing: Concession 7 Culvert Headwater Elevation (m) Discharge Names Total Discharge (cms) 2.4 x.5 m Box Culvert Discharge (cms) Roadway Discharge (cms) Iterations year SCS year SCS year SCS year SCS year SCS year SCS Overtopping Overtopping Table 2 - Culvert Summary Table: 2.4 x.5 m Box Culvert Discharge Names Total Discharge (cms) Culvert Discharge (cms) Headwater Elevation (m) Inlet Control Depth (m) Outlet Control Depth (m) Flow Type Normal Depth (m) Critical Depth (m) Outlet Depth (m) Tailwater Depth (m) Outlet Velocity (m/s) Tailwater Velocity (m/s) 2-year SCS M2c year SCS M2c year SCS M2c year SCS M2c year SCS M2c year SCS M2c

13 ******************************************************************************** Straight Culvert Inlet Elevation (invert): 29.5 m, Outlet Elevation (invert): m Culvert Length: 8.00 m, Culvert Slope: 0.03 ******************************************************************************** Site Data x.5 m Box Culvert Site Data Option: Culvert Invert Data Inlet Station: 0.00 m Inlet Elevation: m Outlet Station: 8.00 m Outlet Elevation: m Number of Barrels: Culvert Data Summary x.5 m Box Culvert Barrel Shape: Concrete Box Barrel Span: mm Barrel Rise: mm Barrel Material: Concrete Embedment: mm Barrel Manning's n: (top and sides) Manning's n: (bottom) Culvert Type: Straight Inlet Configuration: Thin Edge Projecting Inlet Depression: None

14 Table 3 - Downstream Channel Rating Curve (Crossing: Concession 7 Culvert) Flow (cms) Water Surface Elev (m) Depth (m) Velocity (m/s) Shear (Pa) Froude Number Tailwater Channel Data - Concession 7 Culvert Tailwater Channel Option: Trapezoidal Channel Bottom Width: 5.00 m Side Slope (H:V): 3.00 (_:) Channel Slope:.0000 Channel Manning's n: Channel Invert Elevation: m Roadway Data for Crossing: Concession 7 Culvert Roadway Profile Shape: Constant Roadway Elevation Crest Length: 6.00 m Crest Elevation: m Roadway Surface: Gravel Roadway Top Width: 8.00 m