FUNCTIONAL SERVICING REPORT - Oakville planning/da-173512-fsr.pdf · Functional Servicing Report...

TRAFALGAR ENGINEERING LTD.

#1 - 481 Morden Road

Oakville Ontario

L6K 3W6

Tel: (905) 338-3366 Fax: (905) 338-7734 e-mail: [email protected]

FUNCTIONAL SERVICING REPORT

Water, Wastewater and Stormwater Management

for

181 Burloak Drive

Town of Oakville

Sabrina Homes

PREPARED BY

TRAFALGAR ENGINEERING LTD.

PROJECT: 1612

February 13, 2017

TABLE OF CONTENTS

Page

1.0 INTRODUCTION 1

1.1 Scope of Functional Servicing Report 1

1.2 Site Location and Description 1

1.3 Proposed Development 2

2.0 MUNICIPAL SERVICES (Water, Wastewater) 2

2.1 Water 2

2.2 Wastewater 3

3.0 STORM DRAINAGE 4

3.1 Existing Drainage 4

3.2 Minor System 4

3.3 Major System 5

3.4 Stormwater Management Design 6

4.0 GRADING 6

5.0 SUMMARY 6

APPENDICES

Appendix ‘A’ - Draft Plan of Subdivision

- Topographic Survey

Appendix ‘B’ - Engineering Drawing Records

Appendix ‘C’ - Preliminary Servicing Plan, Drawing S1

- Preliminary Grading Plan, Drawing G1

Functional Servicing Report Trafalgar Engineering Ltd.

Sabrina Homes – 181 Burloak Drive, Oakville

February 13, 2017 Project: 1612

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1.0 INTRODUCTION

1.1 Scope of Functional Servicing Report

This report has been prepared in support of the planning applications being submitted, namely, the

Draft Plan of Subdivision for the subject lands located at 181 Burloak Drive in the Town of

Oakville. A copy of the Draft Plan of Subdivision as well as a topographic survey of the property

are enclosed in Appendix ‘A’. The report discusses how the subdivision can be serviced by the

existing infrastructure for wastewater, storm drainage and water. This report also provides a

conceptual design framework for sewers and watermains as well as preliminary grading from

which detailed designs can evolve once draft plan approval is granted.

Information provided in the report is based on our general knowledge of the area as well as

information obtained from the Town of Oakville and the Region of Halton.

1.2 Site Location and Description

As mentioned, the site is known municipally as 181 Burloak Drive. The site is located on the east

side of Burloak Drive between Stevenson Road and Wavecrest Street and is currently occupied by

a single one-storey house. The north and south side of the site abut existing low density residential

lands. The east side of the property also abuts low density residential lands including a small

section of frontage onto Wilmot Crescent. The property is generally rectangular in shape and has

an area of 0.2984 ha. A detailed topographic survey of the property was undertaken in December,

2016. A copy of the survey is provided in Appendix ‘A’ for reference purposes.




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1.3 Proposed Development

The proponent (Sabrina Homes) proposes to develop the subject property by subdividing the

property into four residential lots. The lots will be created by plan of subdivision. Three of the

proposed lots will front onto Burloak Drive (Lots 2, 3 and 4) and one lot (Lot 1) will front onto

Wilmot Crescent. A Draft Plan of Subdivision prepared by Candevcon Limited is provided in

Appendix ‘A’ for reference purposes.

2.0 MUNICIPAL SERVICES (Water, Wastewater)

Development of the site will require adequately sized water and wastewater services to be

constructed in accordance with the Region of Halton design criteria and policies. It is unknown

whether the existing house is serviced municipally for water and wastewater. The surrounding

lands are all serviced municipally.

2.1 Water

There are existing watermains on Burloak Drive and Wilmot Crescent. The watermain on

Burloak Drive is 300mm in diameter and is located within the boulevard on the east side of the

road. The watermain on Wilmot Crescent is 150mm in diameter and is located within the

boulevard on the west side of the road. Both watermains were constructed in the 1980’s and can

be considered relatively new and adequately sized to provide a reliable supply of water for

domestic use as well as fire protection. No flow tests were undertaken. The Region’s protocol for

150mm and 300mm watermains permits direct water service connection.

Adequately space fire hydrants exist on Burloak Drive and Wilmot Crescent. Appendix ‘B’

contains municipal drawing records from which the above information was obtained.




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In light of the above, the lots can be serviced by simply providing individual water service

connection to the existing watermains.

Appendix ‘C’ contains the Preliminary Servicing Plan showing the proposed water service

connections; three to the watermain on Burloak Drive and one to the watermain on Wilmot

Crescent.

2.2 Wastewater

There are existing sanitary sewers on Burloak Drive and Wilmot Crescent. The sanitary sewer on

Burloak Drive is 525mm in diameter and is located within the south-bound lane of the road at a

depth of approximately 5m below the road. The sewer drains in a southerly direction.

The sanitary sewer on Wilmot Crescent is 150mm in diameter and is located along the centre of

the road. Both sewers were constructed in the 1980’s and hence can be considered relatively new.

Appendix ‘B’ contains municipal drawing records from which the above information was

obtained. We are not aware of any servicing capacity issues with either sewer, however this will

need to be confirmed by the Region.

It is proposed that the three lots fronting onto Burloak Drive be serviced by providing individual

service laterals to each lot from the existing sanitary sewer. It is important to note that the Region

of Halton “Water and Wastewater Linear Design Manual”. Section 3.8.11 states:

“Sanitary service laterals are not permitted to connect into wastewater mains sized

450mm diameter or larger, including manhole structures associated with the trunk

sewer.”

In order to provide sanitary service connections to the existing sewer, a Design Deviation Memo

will need to be submitted for approval by the Region of Halton.




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The lot fronting onto Wilmot Crescent will be serviced from the existing 150mm diameter sanitary

sewer on Wilmot Crescent. The municipal drawing records indicate that a service lateral exists to

the streetline at a depth of approximately 2.5m. It is proposed that this service lateral be utilized to

service this lot. The Sanitary Drainage Area Plan for the underlying subdivision (20M-316) file

DO 160 shows that the design of the sanitary sewer on Wilmot Crescent accounted for the area of

Lot 1.

Appendix ‘C’ contains the Preliminary Servicing Plan showing the proposed sanitary service

laterals on Burloak Drive and the existing service lateral on Wilmot Crescent.

3.0 STORM DRAINAGE

3.1 Existing Drainage

The topographic survey shows that the existing drainage pattern for the property is from north-

west to south-east towards Wilmot Crescent. There are no external overland drainage

considerations except for some localized surface drainage from the backyard of the lot to the

north. There is no storm sewer system on the property; all drainage is via surface sheet drainage.

The site appears to be well draining.

3.2 Minor System

Burloak Drive and Wilmot Crescent have typical urban section with municipal curbs and storm

sewer systems. There is an existing 300mm diameter storm sewer on Burloak Drive. The sewer’s

upstream terminus is located approximately 20m south of the property. There is no storm sewer

along the Burloak frontage of the property. There is an existing 300mm diameter storm sewer on

Wilmot Crescent. The Storm Drainage Area Plan for the underlying subdivision (20M-316) file

SD 264 shows that the design of the storm sewers on Wilmot Crescent accounted for 0.1348 of the

0.2984 ha site at a runoff co-efficient of 0.4. In addition, the underlying subdivision included the




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installation of an RLCB lead stubbed off just inside of the property in the event that in the future

the need for an RLCB arises. The stubbed RLCB lead is situated on an easement in favour of the

Town.

In light of the above information and in keeping with the existing drainage pattern, it is proposed

that surface drainage from the front portion of the 3 lots fronting Burloak Drive sheet drain to

Burloak Drive. Foundation drainage for the 3 lots will be directed to basement sumps that will

need to be pumped up and discharged to grade. The rear of the lots and the lot fronting Wilmot

Crescent will drain to the Wilmot Crescent storm sewer.

It is also proposed that an RLCB be incorporated into the design of the subdivision to collect and

convey runoff to the Wilmot Crescent storm sewer using the existing RLCB lead. The RLCB lead

can also serve as a storm lateral connection for foundation drainage from Lot 1.

Appendix ‘C’ contains the Preliminary Servicing Plan and Grading Plans which depict what is

described above.

3.3 Major System

As mentioned above, the only external surface drainage entering the property is a localized area

from the rear yard of the property to the north. The overland flow routes on Burloak Drive and

Wilmot Crescent are well defined and provide positive and continuous conveyance along the road

network. The existing major system overland flow is shown on the Grading Plan in Appendix ‘C’.




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3.4 Stormwater Management

As identified in Section 3.2, almost one half of the site has been accounted for in the design of the

storm sewer on Wilmot Crescent. Given the small size of the development as well as the generous

lot areas and the existing conditions, we do not anticipate an increase in peak flow from the site.

In terms of water quality resulting from the development of the property, for the same reasons

given above, we do not anticipate a detrimental degradation in stormwater quality.

4.0 GRADING

The development of the property in terms of grading must take into account the boundary

conditions that exist on all sides of the property such that the existing drainage patterns are

maintained and drainage is not impeded. In addition to the above, it is desirable that the lot

grading design follows standard common types of residential lot grading such as split and rear to

front draining lots. The above have been achieved. The 3 proposed lots fronting onto Burloak

Drive will be split draining lots and the lot fronting onto Wilmot Crescent will take the form of a

transition lot given its shape and the drainage patterns on the abutting properties. An RLCB has

been introduced at the south-west corner of Lot 1. The RLCB will intercept the rear lot swale

along the rear of Lots 2, 3 and 4, and the side yard of Lot 1.

Appendix ‘C’ contains the Preliminary Grading Plan which shows the proposed overall

subdivision grading.

5.0 SUMMARY

This report has shown that the proposed development of the subject lands can be serviced by the

existing local municipal infrastructure. Furthermore, the preliminary servicing and grading

designs presented herein shows that the subject lands can be developed to meet municipal

requirements and standards for residential type developments within an urban setting.

APPENDIX ‘A’

Draft Plan of Subdivision

Topographic Survey

APPENDIX ‘B’

Engineering Drawing Records

APPENDIX ‘C’

Preliminary Servicing Plan; Drawing S1

Preliminary Grading Plan; Drawing G1

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