FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

PROPOSED RESIDENTIAL DEVELOPMENT – 143 BLUEWATER PLACE & 105 AVONDALE COURT

CITY OF BURLINGTON, ONTARIO

Project No: 13215

CITY DITCH HYDRAULIC ANALYSIS

Prepared For:

BLOOMFIELD DEVELOPMENTS INC.

Prepared By:

The Odan/Detech Group Inc.

ISSUED: August 21, 2019

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

TABLE OF CONTENTS

1.0 BACKGROUND .................................................................................................................. 1

2.0 STUDY METHODOLOGY ................................................................................................... 1

3.0 SYSTEM MODEL ............................................................................................................... 2

4.0 MODEL INPUT AND RESULTS .......................................................................................... 3

5.0 CONCLUSIONS ................................................................................................................ 11

6.0 REFERENCES .................................................................................................................. 12

LIST OF TABLES Table 1 – Hydrology parameters for runoff determination ................................................................ 3 Table 2 – Node (MH) information .................................................................................................... 3 Table 3 – Link (pipe) information ..................................................................................................... 3 Table 4 – Nodal Results .................................................................................................................. 4 Table 5 – Link Results ..................................................................................................................... 4

LIST OF FIGURES

Exhibit 1 - Global XPSWMM Model ................................................................................................ 2 Exhibit 2 – Profile plot from MH 1 to Lake - 5year storm ................................................................. 5 Exhibit 3 – Profile plot from MH 1 to Lake - 100year storm ............................................................. 6 Exhibit 4 – Profile plot from MH 1 to Lake 100 year storm with 20% more flow added to MH-1 ...... 7 Exhibit 5 – Profile plot from MH 1 to Lake 100 year storm with 40% more flow added to MH-1 ...... 8 Exhibit 6 – Hydrology runoff at select nodes ................................................................................. 9

APPENDIX A Aerial View of Site Figure 1 Overland flow to City Ditch tributary area map Figure 2 Flood line map

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 1

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

1.0 BACKGROUND

The property under study is a 1.62 ha site on the south side of Lakeshore Road in the City of Burlington. The site is bounded by Lake Ontario to the south, existing residential development to the west, existing residential to the east and existing Lakeshore Road to the north. The municipal addresses for the site are 105 Avondale Court and 143 Blue Water Place lane. Presently the development on the site is two single family homes with related parking along a common laneway. It is proposed to construct a new low rise residential building along with underground parking. There is a City drainage ditch in the area of concern that runs parallel with Avondale Court. This ditch runs along the southeast portion of the subject site and discharges to Lake Ontario. In addition to the overland flow this ditch accepts flow from a City sewer system. Discussions between the City and the Developers resulted in an agreement that the Developer would undergo an analysis of the City Ditch. This report will evaluate the hydraulic impact of the existing flow from the City Ditch on the subject property. The report will analyze the flows to the ditch, the subsequent hydraulic grade lines (HGL), erosion effects and flood impacts. Refer to Figure 1in appendix A for the location of the City Ditch relative to the Subject Site.

2.0 STUDY METHODOLOGY

The Study is not intended to be a rework of the City design but rather a detailed analysis of the existing City Ditch based on info given to Odan/Detech by the City and assumptions made by Odan/Detech. Odan/Detech created a dynamic model from info given by the City. The info given are various PDF Plan and Profile drawings. The info was in imperial units and converted into metric by Odan/Detech. ASSUMPTIONS:

The inverts were taken from the profiles by Kerry T. Howe Limited (transfer to sanitary operating Map) dated April 23, 1981.

Additional topographical info by Mackay, Mackay & Peters Limited.

The tributary areas for the 54” (1372 Ø storm sewer) is unknown and would be a large task to undergo. It was agreed with the City that the flow to the ditch from this sewer would be limited to the full barrel flow of the pipe. The full barrel flow is a constant and thus applies to the 5 year and 100 year overland flows to the ditch. The full barrel flow is 2.61 cms.

The overland flow area to the ditch was estimated using given topology and walking the site. This flow was lumped at the beginning of the channel (conservative).

The creek culvert crossing is a 1200 Ø CSP pipe with a head wall. We assumed an entrance loss of 0.5 and an exit loss of 1.0. This is in keeping with the MTO Drainage Manual culvert design section.

Trapezoidal City Ditch we are assuming n= 0.05, for ditch portion near the culvert crossing n=0.05, channels downstream of culvert n=0.08. These manning values are in keeping with Conservation Authorities design criteria.

Assume City Ditch is built similar to that shown on the Kerry T. Howe Limited plan.

Lake 100 year level and 100 year storm event do not occur simultaneously. The remainder of the study will display the results of the analysis of XPSWMM. The results will be in the form of tables and profile plots. A discussion of the results will be given.

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 2

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

3.0 SYSTEM MODEL

Exhibit 1 - Global XPSWMM Model

EX. 54” (1372) STM

SEWER FROM

AVONDALE COURT

EXISTING

HEADWALL

EX. Trapezoidal

channel. Bottom 1.5m,

sides 2:1 and 3:1

EX. Trapezoidal

channel. Bottom 2.0m,

sides 3:1 and 3:1

transition from straight

channel to culvert

EX. 1200 CSP with

road on top modelled as

a multilink → culvert

pipe plus channel

above for overflows

EX. Natural channel with

gabion walls. Irregular

shape. Section varies along

length. Chose the most

conservative section

Hydrology entered at this

location for overland flow to

channel.

EX. Natural channel with

gabion walls. Irregular

shape. Section varies along

length. Chose the most

conservative section

Pipe full barrel flow

entered here.

Outfall to Lake at

invert 75.40m

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 3

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

4.0 MODEL INPUT AND RESULTS

Table 1 – Hydrology parameters for runoff determination

Table 2 – Node (MH) information

Table 3 – Link (pipe) information

Name Storm Subcatchment

Area

ha

Width

m Slope

Impervious

Percentage

%

Pervious

Area Curve

Number

Pervious

Depression

storage

Depth mm

Infiltration

Reference

Hydrology

Methods

HW-1 5 yr 1 7.180 164.1 0.012 35.0 80 5 SCS SWMM runoff

7.180

Name

Ground

Elevation

(Spill Crest)

m

Invert

Elevation m

CULV-OUT 80.02 77.29

CULV-IN 80.10 77.43

HW-1 80.50 78.46

MH-1 81.60 78.57

Node-2 78.50 76.13

Node-1 79.89 77.72

Lake Ontario 77.00 75.40

Downstream

Node Name

Upstream

Node

Name

trapezoidal

bott width &

side slopes

Diameter

(Height) m

Conduit

Slope %Roughness Length m Shape

Downstream

Invert

Elevation m

Upstream

Invert

Elevation m

Node-2 CULV-OUT 1.375 3.87 0.08 32.0 Natural 76.13 77.29

CULV-OUT CULV-IN 1.200 1.08 0.024 13.0 Circular 77.29 77.43

CULV-OUT CULV-IN 1.5m, 60:1 60:1 0.300 0.62 0.04 13.0 Trapezoidal 79.72 79.80

Node-1 HW-1 1.5m, 3:1 2:1 1.200 0.76 0.05 97.5 Trapezoidal 77.72 78.46

HW-1 MH-1 1.372 0.22 0.013 50.3 Circular 78.46 78.57

Lake Ontario Node-2 1.375 1.46 0.08 50.0 Natural 75.40 76.13

CULV-IN Node-1 2.0m, 3:1 3:1 1.200 1.16 0.05 25.0 Trapezoidal 77.43 77.72

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 4

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Table 4 – Nodal Results

Table 5 – Link Results

Note - Table 4 and 5 results are for full barrel flow at MH 1.

Name Storm Freeboard

m

Max Water

Depth m

Max Water

Elevation m

CULV-OUT 5yr-4hr-Chi 1.87 0.86 78.15

CULV-OUT 100yr-4hr-Chi 1.84 0.90 78.19

CULV-IN 5yr-4hr-Chi 1.04 1.63 79.06

CULV-IN 100yr-4hr-Chi 0.85 1.82 79.25

HW-1 5yr-4hr-Chi 1.13 0.91 79.37

HW-1 100yr-4hr-Chi 1.03 1.01 79.47

MH-1 5yr-4hr-Chi 2.05 0.98 79.55

MH-1 100yr-4hr-Chi 1.99 1.04 79.61

Node-2 5yr-4hr-Chi 1.37 1.00 77.13

Node-2 100yr-4hr-Chi 1.33 1.04 77.17

Node-1 5yr-4hr-Chi 0.82 1.35 79.07

Node-1 100yr-4hr-Chi 0.64 1.53 79.25

Lake Ontario 5yr-4hr-Chi 0.99 0.61 76.01

Lake Ontario 100yr-4hr-Chi 0.96 0.64 76.04

Name Storm Max d/D

(depth/diameter)

Design Full

Flow cms

Max Flow

cms

Max

Velocity

m/s

Max Flow/Design

Flow (fraction)

%

trap-channel-2 5yr-4hr-Chi 1 11.42 2.985 0.6 0.262

trap-channel-2 100yr-4hr-Chi 1 11.42 3.278 0.6 0.287

trap-channel-1 5yr-4hr-Chi 1 7.25 3.105 0.96 0.429

trap-channel-1 100yr-4hr-Chi 1 7.25 3.538 0.96 0.489

sewer 5yr-4hr-Chi 0.715 2.61 2.622 2.62 1.008

sewer 100yr-4hr-Chi 0.757 2.61 2.622 2.62 1.008

overflow 5yr-4hr-Chi 0 3.32 0 0 0

overflow 100yr-4hr-Chi 0 3.32 0 0 0

ditch-to-Lake 5yr-4hr-Chi 0.725 8.64 2.978 1.36 0.345

ditch-to-Lake 100yr-4hr-Chi 0.756 8.64 3.264 1.39 0.378

ditch to lake-2 5yr-4hr-Chi 0.725 6.03 2.978 1.06 0.493

ditch to lake-2 100yr-4hr-Chi 0.756 6.03 3.264 1.09 0.541

culv 5yr-4hr-Chi 1.361 2.19 2.978 2.69 1.359

culv 100yr-4hr-Chi 1.513 2.19 3.264 2.94 1.49

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 5

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Exhibit 2 – Profile plot from MH 1 to Lake - 5year storm

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 6

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Exhibit 3 – Profile plot from MH 1 to Lake - 100year storm

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 7

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Exhibit 4 – Profile plot from MH 1 to Lake 100 year storm with 20% more flow added to MH-1

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 8

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Exhibit 5 – Profile plot from MH 1 to Lake 100 year storm with 40% more flow added to MH-1

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 9

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Exhibit 6 – Hydrology runoff at select nodes

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1 WedJun 2016

3AM 6AM 9AM 12PM 3PM 6PM 9PM 2 Thu 3AM

Node - HW-1

Flo

w

Time

5yr-4hr-Chi[Max 0.543] 100yr-4hr-Chi[Max 1.038]

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 10

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

DISCUSSION: The discussion below is in no particular order.

1. The 4 hour 5 year and 100 year Chicago storms were run as per the City criteria.

2. The HGL is contained within the channels and culvert in 5 year & 100 year storms.

3. No modification to the culvert crossing is required.

4. As a check we looked at overland flow to ditch. The Tc from the remote to point A (Lakeshore) is calculated as follows: City Maps: Total length - 213 m – slope of land (average) = 1.2% Tc = 30 min. from airport method C calculated from % impervious as C = 0.35 x 0.7 + 0.20 = 0.45

I= 697.4 / (Tc+5)0.764 = 46 mm/hr → Q5 = 2.78 CIA = 2.78 (0.45) 46 (7.18) = 413 L/sec XPSWMM Q5 = 543 L/sec XPSWMM flows are more conservative!

5. Freeboard in table 4 (nodal results) is difference from spill crest to HGL. Spill crest is as

follows: For HW-1 0.67m above the pipe obvert CULVIN AND CULVOUT 0.30m above the road grade NODE 1 2.11m above the ditch invert NODE 2 2.37m above the ditch invert (approximate top of bank)

6. The velocity in the ditch downstream of the culvert crossing is 1.39 m/sec. This may cause erosion. Erosion control is recommended.

7. The 100 year flood line is contained within the ditch banks. See Figure 2 in appendix A.

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS 11

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

5.0 CONCLUSIONS

1) The City Ditch can accommodate the tributary area so long as flows from the 54” (1372) Ø

sewer from Avondale Court are kept to approximately 120 % of full barrel capacity.

2) The existing 1200 Ø CSP culvert crossing can accommodate the flow without overtopping the crossing.

3) Erosion control rip-rap blanket should be implemented to control erosion downstream of the culvert crossing.

4) The 100 year flood line is well below the long term stable bank for the development of 143 Bluewater Place.

143 BLUEWATER PLACE, BURLINGTON CITY DITCH HYDRAULIC ANALYSIS

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

APPENDIX A

AERIAL VIEW OF SITE

Figure 1 Overland flow to City Ditch tributary area map Figure 2 Flood line map

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Aerial view of Site and surrounding Site.

Subject Site

FILE No. 13215 -Bluewater Place-City Ditch Analysis- August 2019.docx THE ODAN/DETECH GROUP INC.

Figure 1 Overland flow to City Ditch tributary area map Figure 2 Flood line map

(Folded in envelope)

The Odan/Detech Group Inc. P: (905) 632-3811 F: (905) 632-3363

5230 SOUTH SERVICE ROAD, BURLINGTON, ONTARIO, L7L 5K2

NO

RT

H

The Odan/Detech Group Inc. P: (905) 632-3811 F: (905) 632-3363

5230 SOUTH SERVICE ROAD, BURLINGTON, ONTARIO, L7L 5K2

The Odan/Detech Group Inc. P: (905) 632-3811 F: (905) 632-3363

5230 SOUTH SERVICE ROAD, BURLINGTON, ONTARIO, L7L 5K2

NO

RT

H

The Odan/Detech Group Inc. P: (905) 632-3811 F: (905) 632-3363

5230 SOUTH SERVICE ROAD, BURLINGTON, ONTARIO, L7L 5K2