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North Gower), City of Ottawa, Ontario Civil Geotechnical Structural Environmental Industrial Health & Safety 210 Prescott Street, Unit 1 (613) 860-0923 P.O. Box 189 Kemptville, Ontario K0G 1J0 FAX: (613) 258-0475 STORM WATER REPORT PROPOSED DOG KENNEL 5673 FOURTH LINE ROAD RIDEAU (NORTH GOWER), CITY OF OTTAWA, ONTARIO PREPARED FOR: JOE GIBSON 2800 HARBISON ROAD K0A 2Z0 RICHMOND, ONTARIO PROJECT # 100754 DISTRIBUTION: 4 copies – City Of Ottawa 1 copy – Joe Gibson 1 copy – Kollaard Associates Inc. Revision 0 - Issued for Site Plan Control January 25, 2013 Professional Engineers Authorized by the Association of Professional Engineers Storm Water Report – Proposed Kennel Building 5673 Fourth Line Road Ottawa, Ontario January 25, 2013 ─ 2 ─ File No. 100754 Table of Contents Introduction ........................................................................................................................................................... 3 Current (Pre-development) Site Conditions .......................................................................................................... 3 Pre-Development Off Site Drainage ..................................................................................................................... 4 Proposed Property Use ......................................................................................................................................... 4 Storm Water Quantity Analysis ............................................................................................................................. 4 Pre-Development Baseline Conditions .............................................................................................................. 6 Post-Development Stage................................................................................................................................... 6 Controlled Areas ................................................................................................................................................ 7 Impervious Ratio ................................................................................................................................................ 8 Storm water Release Rate from Uncontrolled Areas ........................................................................................ 8 Allowable Controlled Area Release Rate .......................................................................................................... 8 Storage and Release Rate .................................................................................................................................... 9 Sediment and Erosion Control ............................................................................................................................ 10 Related Drawings Drawing # 100754 -SP – Site and Erosion Control plan # 100754 - GS - Grading and Servicing Plan Attachments Figure 1 - Controlled and Uncontrolled areas Appendix A Stormwater Management - Rational Method Allowable Controlled Area Release Rate Appendix B Stormwater Management - Rational Method Calculation Sheet Actual Discharge Rate and Storage Volume Requirements Appendix C Dry / Infiltration Pond Volume and Discharge Rates Civil • Geotechnical • Structural • Environmental • Hydrogeology Storm Water Report – Proposed Kennel Building 5673 Fourth Line Road Ottawa, Ontario January 25, 2013 ─ 3 ─ File No. 100754 INTRODUCTION Joe Gibson has retained the services of Kollaard Associates Inc. to provide a storm water management design system for the proposed commercial building development at a site along the Northeast side of Fourth Line Road about 650 metres northwest of Century Road, North Gower, Ottawa, Ontario. The proposed commercial building development will consist of about a 1655 square metre dog kennel building completed with access and parking owned and operated by Joe Gibson. It is understood that the site is subject to the following stormwater management criteria: The post development runoff rate from the site is to equal the predevelopment runoff rate from the site assuming a runoff coefficient of C = 0.3 for the five year storm and C = 0.375 for the 100 year storm predevelopment conditions; An enhanced level of treatment is required for the site. No additional mitigation for temperature is required; and The receiving body of water for the roadside ditch along the southwest side of the site. The roadside ditch outlets to a municipal drain about 1.4 kilometres southeast of the site. In general the stormwater management design consists of directing the runoff by sheet flow away from the proposed building to shallow swales which will outlet to shallow dry ponds along the southwest side of the site. The dry ponds will outlet to the road side ditches through sand berms which will provide filtration and flow restriction CURRENT (PRE-DEVELOPMENT) SITE CONDITIONS The proposed development site is located on the Northeast side of the Fourth Line Road in North Gower, Ottawa, Ontario, see attached Key Plan Figure 1. The proposed development site consists of a about 8723 square metres portion of the about 71 hectare property commonly known as 5673 Fourth Line Road, North Gower, Ottawa, Ontario. The site is currently used as farming land. Based on the existing ground cover and soil characteristics, the pre-development runoff coefficient will be taken as C = 0.3 for the 5 year and C = 0.375 for the 100 year storm for the purposes of this stormwater management design. Civil • Geotechnical • Structural • Environmental • Hydrogeology Storm Water Report – Proposed Kennel Building 5673 Fourth Line Road Ottawa, Ontario January 25, 2013 ─ 4 ─ File No. 100754 Existing stormwater runoff in general consists of uncontrolled sheet flow to the ditch along the southwest side of the site. PRE-DEVELOPMENT OFF SITE DRAINAGE The site generally slopes from northeast to southwest. Based on the existing drainage patterns of the properties surrounding the site, there is no offsite runoff being directed to the site. PROPOSED PROPERTY USE The proposed development of the site consists of about a 1655 square metre kennel building. The proposed building will be serviced by a Asphaltic concrete surfaced driveway and parking area. The asphaltic concrete surface driveway and parking area will have a combined area of some 536 square metres. Runoff from the controlled area portions of the site will be directed towards the shallow dry ponds along the southwest side of the site and will be released at a controlled rate to the existing roadside ditch along the southwest side of the site. STORM WATER QUANTITY ANALYSIS Peak Flow for runoff quantities for the Pre-Development and Post-Development stages of the project were calculated using the rational method. The rational method is a common and straightforward calculation, which assumes that the entire drainage area is subject to uniformly distributed rainfall. The formula is: CiA Q 360 Where Q is the Peak runoff measured in m3/s Civil • Geotechnical • Structural • Environmental • Hydrogeology Storm Water Report – Proposed Kennel Building 5673 Fourth Line Road Ottawa, Ontario January 25, 2013 ─ 5 ─ File No. 100754 C is the Runoff Coefficient, Dimensionless A is the runoff area in hectares i is the storm intensity measured in mm/hr The Runoff Coefficient, C, is a measure of the amount of rainfall that converts to surface runoff. For example a value of C=1 represents a condition in which all rainwater would leave the area under study as surface runoff. None of the water would infiltrate or evaporate during a rainfall event. However, a value of C=0.5 is used when it is estimated that only half of the water leaves the area as surface runoff. The other half would infiltrate or evaporate on site. The Storm Intensity, i, is a function of geographic location, and is a measure of average rainfall quantity. Storm Intensity values consider three factors: storm intensity, time period of storm event, and return period of storm. These factors are represented by Intensity – Duration – Frequency Curves (IDF Curves). All values for intensity, i, for this project were derived from IDF curves provided by the City of Ottawa for data collected at the Ottawa International airport. For this project two return periods, were considered. The 5-year event and the 100-year event. The formulas for each are: 5-Year Event 998.071 i 0.814 tc 6.05 100-Year Event 1735.688 i 0.82 tc 6.014 where tc is time of concentration Civil • Geotechnical • Structural • Environmental • Hydrogeology Storm Water Report – Proposed Kennel Building 5673 Fourth Line Road Ottawa, Ontario January 25, 2013 ─ 6 ─ File No. 100754 Pre-Development Baseline Conditions The pre-development baseline runoff rate was established using the rational method. From Appendix 5-D of the City of Ottawa Storm Sewer Design Guideline, the time of concentration was determined to be thirty-one minutes for the 5 year design storm and 28 minutes for the 100 year design storm. The longest distance of travel for the area contained within the limit of development is approximately 144 metres with a slope of about 1 percent and a C factor of 0.3 and 0.375 for the 5 year and 100 year design storms respectively. A Thirty-one minute duration yields an intensity of 52.74 mm/hr for a 5-year storm event a 28 minute duration yields and intensity of 96.27 mm/hr for a 100-year storm event from the IDF curve. The pre-development runoff coefficient was set to C = 0.30 for the five year storm and C = 0.375 for the 100 year storm to model the undeveloped grass
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