Final

246-248 Lester Street City of Waterloo Stormwater Management Report

Prepared for Lester Development Inc.

by IBI Group

July 21, 2017

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

Document Control Page

July 21, 2017

CLIENT: Lester Development Inc.

PROJECT NAME: 246-248 Lester Street, City of Waterloo

REPORT TITLE:

246-248 Lester Street City of Waterloo Stormwater Management Report

IBI REFERENCE: 103224

VERSION:

DIGITAL MASTER: http://iprojects1.ibigroup.com/103224/Project Documents/05.0 Design (Work) Phase/Stormwater/WTR-SWM-2017-07-18.docx\2017-07-21\AK

ORIGINATOR:

REVIEWER:

AUTHORIZATION:

CIRCULATION LIST:

HISTORY:

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

Table of Contents

July 21, 2017 i

1 INTRODUCTION .................................................................................................................. 1

2 EXISTING CONDITIONS ..................................................................................................... 1

3 PROPOSED CONDITIONS .................................................................................................. 1

4 STORMWATER MANAGEMENT ........................................................................................ 2

4.1 Stormwater Quantity Control ................................................................................... 2

4.2 Stormwater Quality Control ...................................................................................... 4

5 CONCLUSIONS AND RECOMMENDATIONS .................................................................... 4

List of Tables

Table 1 Rainfall Depths ................................................................................................................... 2

Table 2: MIDUSS Modelling Variables ........................................................................................... 2

Table 3: Peak Discharges ............................................................................................................... 3

Table 4: Ponding Characteristics .................................................................................................... 3

List of Figures

Figure 1: Site Location Figure 2: Existing Storm Catchment Areas Figure 3: Proposed Storm Catchment Areas

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

Table of Contents

July 21, 2017 ii

List of Appendices

Appendix A – Stormwater Calculations Appendix B – MIDUSS Model Output Appendix C – Geotechnical Investigation

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

July 21, 2017 1

1 INTRODUCTION

IBI Group was retained to prepare a Stormwater Management Report in support of an

application for a proposed apartment building development located at 246-248 Lester Street in

the City of Waterloo. The 0.142 ha property is bounded by existing residential development to

the north, south, and east (refer to Figure 1).

This Report addresses the stormwater management quantity and quality control requirements to

accommodate construction of a new building development on the site.

2 EXISTING CONDITIONS

The developing property consists of two single lots (246, 248 Lester Street) containing

residential houses, concrete walkways, asphalt driveways, sheds, pads and decks, and grass

yards.

Referring to Figure 2, runoff from the existing lots within Area 102 drains overland toward the

west to Lester Street. Runoff from Area 101 drains overland toward the south and outlets to an

existing lot. An external area to the east consisting of rear yards (Area 100) drains overland to

Area 101.

Based on the Geotechnical Investigation completed by Chung & Vander Doelen Engineering

Ltd. (included Appendix C), site soils include silty fine sand to sand, with groundwater levels

ranging from 5.5m to 6.7m below existing grade. Based on the soils on site, a CN value of 66

was used for the modelling of pervious areas.

3 PROPOSED CONDITIONS

The existing houses will be demolished and replaced with a new residential building, grass and

landscaped areas, and parking areas, as shown on Figure 3. Based on the proposed

stormwater management design outlined below, minor runoff from the development will be

collected in a site storm sewer and routed to an existing 300mm diameter storm sewer on Lester

Street. Major runoff will spill overland toward Lester Street.

Stormwater attenuation will be provided on the rooftop using flow control roof drains, with

additional attenuation provided underground and on the parking lot surface. Stormwater quality

control for parking areas will be provided using Snout oil/grit separator (OGS) units. Based on

the relatively high infiltration rate provided in the Geotechnical Investigation (15 to 50mm/hour),

active infiltration of roof runoff has been considered in the design. However, based on the

proposed building location, insufficient space is available to install an infiltration gallery and

maintain a 5.0m separation from the building. Therefore, active infiltration is not proposed in the

design.

SUBJECT

SITE

N

DATE

SCALE

PROJECT No.

FIGURE 1

SITE LOCATION

246-248 LESTER STREET

CITY OF WATERLOO

NTS

JULY 21, 2017

103224E

IBI GROUP

101 - 410 Albert Street

Waterloo ON N2L 3V3 Canada

tel 519 585 2255 fax 519 585 2269

ibigroup.com

LE

ST

ER

S

TR

EE

T

EX. ELEVATED WALKWAY

EX PARKING BELOW

CONC. TOE WALL

EX. CONC. CURB

EX

.H

YD

RO

TR

AN

SF

.

EX.MOLOK

GARBAGE BINS

EX

.C

ON

C.

PA

D

LEGEND

SCALE

PROJECT No.

DATE

1:300

JULY 21, 2017

103224E

CITY OF WATERLOO

REGIONAL MUNICIPALITY

OF WATERLOO

246-248 LESTER STREET

APARTMENT BUILDING

EXISTING STORM

CATCHMENT AREAS

FIGURE 2

IBI GROUP

101 - 410 Albert Street

Waterloo ON N2L 3V3 Canada

tel 519 585 2255 fax 519 585 2269

ibigroup.com

04 10

1:300

52

(m)

15

N

CO

NS

TR

UC

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N N

OR

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LE

ST

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S

TR

EE

T

EX. ELEVATED WALKWAY

EX PARKING BELOW

CONC. TOE WALL

EX. CONC. CURB

EX

.H

YD

RO

TR

AN

SF

.

EX.MOLOK

GARBAGE BINS

EX

.C

ON

C.

PA

D

LANDSCAPE BUFFER

BIKE RINGS

LINE BUILDING ABOVE

RESIDENTIAL

PATIO

CO

NC

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UR

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SC

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LANDSCAPE AREA

CONC. CURB

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CONC. c.i.p. RETAINING WALL

CO

NC

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EXIT

ENTRANCE

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EXIT

VESTIBULE

CONC. TOE WALL

DN

UPDN

UP

LINE OF RAISED

TOWER ABOVE

BALCONY ABOVE AT

TOWER LEVEL

GAS METER

ELEVATOR

FHC

BIKE RINGS

LINE OF RAISED

TOWER ABOVE

LINE OF RAISED TOWER ABOVE

246-248 LESTER STREET

PROPOSED 12-STOREY

RESIDENTIAL APARTMENT BUILDING

BUILDING LINE ABOVE

TRANSFORMER RM.

MAIN

ENTRANCE

CO

NC

RE

TE

LINE OF RAISED TOWER ABOVE

®

SCALE

PROJECT No.

DATE

1:300

JULY 21, 2017

103224E

CITY OF WATERLOO

REGIONAL MUNICIPALITY

OF WATERLOO

246-248 LESTER STREET

APARTMENT BUILDING

PROPOSED STORM

CATCHMENT AREAS

FIGURE 3

LEGEND

IBI GROUP

101 - 410 Albert Street

Waterloo ON N2L 3V3 Canada

tel 519 585 2255 fax 519 585 2269

ibigroup.com

04 10

1:300

52

(m)

15

N

CO

NS

TR

UC

TIO

N N

OR

TH

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

July 21, 2017 2

4 STORMWATER MANAGEMENT

The stormwater management criteria for this development are based on the requirements of the

City of Waterloo. The requirements include:

Stormwater quantity controls are required for the site to control the proposed conditions

peak flows from the site to the existing conditions levels for 2, 5, and 100 year storm

events;

The 2 year storm volume is to be stored underground to minimize frequent nuisance

flooding;

Active infiltration of rooftop runoff should be provided if soil and groundwater conditions

permit; and

Stormwater quality controls are to be provided for the site.

4.1 Stormwater Quantity Control

Three-hour duration Chicago style storms derived from City of Waterloo IDF curves were used

for the stormwater management modelling. The total depths of rainfall for the modelled storms

are indicated in Table 1.

Table 1 Rainfall Depths

RETURN EVENT STORM DURATION (HOURS) RAINFALL DEPTH (MM)

2 Year 3 32.4

5 Year 3 47.5

100 Year 3 90.0

The existing and proposed conditions have been modelled using MIDUSS, in accordance with

City guidelines. Modelling variables are summarized in Table 2.

Table 2: MIDUSS Modelling Variables

CATCHMENT

ID

DESCRIPTION AREA (HA) LENGTH (M) GRADIENT

(%)

IMPERV.

(%)

MANNING

‘N’

PERVIOUS

CN

EXISTING CONDITIONS

100 Lot (External) 0.038 10 2 0 0.250 66

101 Lots 0.089 15 2 2.9 0.250 66

102 Lots 0.053 15 2 75.4 0.250 66

Total 0.180 23.7

PROPOSED CONDITIONS

100 Lot (External) 0.038 10 2 0 0.250 66

201 Roof 0.042 10 1 100 0.013 98

202 Roof 0.031 10 1 100 0.013 98

203 Parking/Grass 0.055 10 2 74.5 0.250 66

204 Grass 0.005 10 30 0 0.250 66

205 Concrete/Grass 0.009 10 2 54.1 0.250 66

Total 0.180 65.9

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

July 21, 2017 3

Rooftop attenuation will be provided using five Zurn Control-Flo roof drains (or approved

equivalent) for roof area 201, and the roof area will outlet to the proposed site storm sewer.

Additional attenuation will be provided underground in a modular basket storage system and on

the parking lot surface at CBMH2 and CBMH3, with a 65mm orifice control at the outlet pipe of

CBMH2 providing flow control.

The site storm sewer will outlet to an existing 300mm diameter storm sewer on Lester Street.

An overland flow route will be provided from the parking area to Lester Street via the driveway.

The rooftop and underground/parking lot stage-storage-discharge calculations are included in

Appendix A, and details are provided on the engineering drawings.

The existing and proposed peak flows from the site are summarized in Table 3, and the MIDUSS

model output is included in Appendix B.

Table 3: Peak Discharges

RETURN EVENT EXISTING CONDITIONS PROPOSED CONDITIONS

PEAK DISCHARGE (M3/S) PEAK DISCHARGE (M3/S)

Draining To South Property Line

2 Year 0.001 0.000

5 Year 0.003 0.000

100 Year 0.019 0.001

Draining To West To Lester Street

2 Year 0.009 0.007

5 Year 0.013 0.011

100 Year 0.024 0.024

As indicted in Table 3, the proposed design will result in no increase in the 2, 5, and 100 year

peak flows from the site, and the proposed conditions peak flows have been controlled to

existing conditions levels for both outlet locations. As summarized in Table 4, the 2 year storm

volume (12 m3) will be stored underground to minimize frequent nuisance flooding, and the

ponding in the parking lot area will be less than 0.30m in depth during the 100 year storm event.

Table 4: Ponding Characteristics

RETURN EVENT STORAGE VOLUME (M3) PONDING DEPTH (M)* PONDING ELEVATION (M)*

2 Year 12 - 339.75

5 Year 18 0.11 340.61

100 Year 40 0.21 340.71

* CBMH2 top of grate elevation = 340.50m

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

July 21, 2017 4

4.2 Stormwater Quality Control

Snout OGS units will be installed at the outlet of CBMH2 and CBMH3 to provide stormwater

quality control for flows generated from the parking lot area. The Snout OGS units are

appropriate for this development given the relatively small impervious parking lot drainage area

(409 m2).

The units should be inspected and cleaned regularly (once every 12 months) as per the

manufacturer’s specifications.

5 CONCLUSIONS AND RECOMMENDATIONS

This Report demonstrates that stormwater attenuation using rooftop storage, and underground

and parking lot surface storage will control peak flows to existing levels for the 2, 5, and 100 year

storms. Stormwater quality will be addressed by routing parking areas through Snout OGS

units.

We trust the foregoing is satisfactory and will allow you to review and approve the Stormwater

Management Report and engineering drawings for this development. If you have any questions

or require additional information please contact the undersigned.

All of which is respectfully submitted.

IBI GROUP

Andy Kroess, M.Eng., P.Eng.

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

July 21, 2017 A-1

Appendix A –Stormwater Calculations

Area Area %

(m3) (ha) Impervious

Total Area 1803 0.180 23.7%

Area 100

Building/Driveway/Walkway 0 0.000

Grass 380 0.038

Total 380 0.038 0.0%

Area 101

Building/Driveway/Walkway 26 0.003

Grass 865 0.087

Total 891 0.089 2.9%

Area 102

Building/Driveway/Walkway 401 0.040

Grass 131 0.013

Total 532 0.053 75.4%

Area Area %

(m3) (ha) Impervious

Total Area 1803 0.180 65.9%

Area 100

Building/Driveway/Walkway 0 0.000

Grass 380 0.038

Total 380 0.038 0.0%

Area 201

Asphalt/Concrete 0 0.000

Building 417 0.042

Grass 0 0.000

Total 417 0.042 100.0%

Area 202

Asphalt/Concrete 0 0.000

Building 312 0.031

Grass 0 0.000

Total 312 0.031 100.0%

Area 203

Asphalt/Concrete 409 0.041

Building 0 0.000

Grass 140 0.014

Total 549 0.055 74.5%

Area 204

Asphalt/Concrete 0 0.000

Building 0 0.000

Grass 52 0.005

Total 52 0.005 0.0%

Area 205

Asphalt/Concrete 50 0.005

Building 0 0.000

Grass 43 0.004

Total 93 0.009 54.1%

103224 - 246-248 Lester Street, City of Waterloo

Existing and Proposed Drainage Areas

Existing Areas

Description

Description

Proposed Areas

IBI Group 7/21/2017

Total Rooftop Area = 417 (m2)

Number of Roof Drains = 5

Roof Cell Area = 83.4 (m2)

The Length of a Cell Side* = 9.13 (m)

Maximum Ponding Depth = 0.152 (m)

Total Number of Notches per Drain = 1

Dep

th

Dep

th

Base A

rea

Cell V

olu

me

To

tal

Vo

lum

e

No

tch

Dis

ch

arg

e**

To

tal

Dis

ch

arg

e

(inch) (m) (m2) (m

3) (m

3) (m

3/s) (m

3/s)

0 0.000 0 0.00 0.00 0.00000 0.00000

1 0.025 2.32 0.02 0.10 0.00038 0.00190

2 0.051 9.27 0.16 0.78 0.00076 0.00380

3 0.076 20.85 0.53 2.65 0.00114 0.00570

4 0.102 37.07 1.26 6.28 0.00152 0.00760

5 0.127 57.92 2.45 12.26 0.00190 0.00950

6 0.152 83.40 4.24 21.18 0.00228 0.01140

* - assumed that the cell is square

** - notch discharge given as 0.38 l/s/notch/inch of head

(from Zurn Control-Flo Roof Drainage System Technical Catalogue)

103224 - 246-248 Lester Street, City of Waterloo

Area 201 Roof Stage-Storage-Discharge Relationship

IBI Group 7/21/2017

Orifice # 1

Orifice Invert = 339.10 m (@ CBMH2 outlet) Storage Tank A

Orifice Radius = 0.0325 m Tank Invert = 339.32 m

Orifice Diameter = 65 mm Tank Obvert = 339.78 m # Units Unit Width (m)

Orifice Centreline = 339.133 m Length = 10.92 m 12 0.910

Orifice Coefficient = 0.6 Width = 2.73 m 6 0.455

Orifice Area = 0.0033182 m2

Depth = 0.46 m 1 0.455

Voids = 0.97

Overflow (@ north swale) Storage = 28.9 m3/m

Weir Crest Elevation = 340.70 m Total Storage = 13.2 m3

Weir Length = 2.50 m

Weir Coefficient = 1.6

Depth Elevation Orifice # 1 Flow Weir Flow Total Flow Tank A Storage Surface Storage Total Storage

(m) (m) (m3/s) (m

3/s) (m

3/s) (m

3) (m

3) (m

3)

0.00 339.10 Orifice #1 Invert 0.00000 0.00000 0.00000 0.0 0.0 0.0

0.22 339.32 Tank # 1 Invert 0.00382 0.00000 0.00382 0.0 0.0 0.0

0.32 339.42 0.00473 0.00000 0.00473 2.6 0.0 2.6

0.42 339.52 0.00549 0.00000 0.00549 5.3 0.0 5.3

0.52 339.62 0.00616 0.00000 0.00616 7.9 0.0 7.9

0.62 339.72 0.00676 0.00000 0.00676 10.6 0.0 10.6

0.68 339.78 Tank # 2 Obvert 0.00709 0.00000 0.00709 13.2 0.0 13.2

1.40 340.50 Top of Grate CBMH2 0.01031 0.00000 0.01031 13.2 0.0 13.2

1.45 340.55 0.01050 0.00000 0.01050 13.2 0.1 13.3

1.50 340.60 0.01068 0.00000 0.01068 13.2 2.8 16.0

1.55 340.65 0.01086 0.00000 0.01086 13.2 9.9 23.1

1.60 340.70 Spill Elevation 0.01104 0.00000 0.01104 13.2 22.1 35.3

1.65 340.75 0.01121 0.04472 0.05593 13.2 39.2 52.4

1.70 340.80 0.01139 0.12649 0.13788 13.2 55.8 69.0

Orifice equation: Q = Co x A x (2 x g x h)0.5

where: A = orifice area (m2)

g = 9.806 m/s2

Weir equation: Q = Cw x L x (H) 3/2

h = head above c/l of orifice (m)

L = weir length (m)

H = head above weir (m)

Description

103224 - 246-248 Lester Street, City of Waterloo

Area 203 Underground Trench & Surface Stage-Storage-Discharge Relationship

IBI Group 7/21/2017

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

July 21, 2017 B-1

Appendix B –MIDUSS Model Output

103224.OUT Output File (4.7) 103224.OUT opened 2017-07-21 9:39 Units used are defined by G = 9.810 36 960 5.000 are MAXDT MAXHYD & DTMIN values Licensee: PLANNING INITIATIVES LTD 35 COMMENT 6 line(s) of comment ******************************************** * 103224 - APARTMENT BUILDING * * 246-248 LESTER STREET, CITY OF WATERLOO * * IBI GROUP * * JULY 2017 * ******************************************** 35 COMMENT 4 line(s) of comment ************************************ * 2 YEAR CHICAGO STORM * * CITY OF WATERLOO IDF PARAMETERS * ************************************ 2 STORM 1 1=Chicago;2=Huff;3=User;4=Cdn1hr;5=Historic 1101.000 Coefficient a 9.258 Constant b (min) .882 Exponent c .400 Fraction to peak r 180.000 Duration ó 180 min 32.400 mm Total depth 3 IMPERVIOUS 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n" 98.000 SCS Curve No or C .100 Ia/S Coefficient .518 Initial Abstraction 35 COMMENT 3 line(s) of comment *********************** * EXISTING CONDITIONS * *********************** 35 COMMENT 3 line(s) of comment ************* * AREA 102 * ************* 4 CATCHMENT 102.000 ID No.ó 99999 .053 Area in hectares 15.000 Length (PERV) metres 2.000 Gradient (%) 75.400 Per cent Impervious 15.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .009 .000 .000 .000 c.m/s .077 .832 .646 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************ * TOTAL FLOW WEST TO LESTER STREET * ************************************ 15 ADD RUNOFF .009 .009 .000 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************* * AREA 100 * ************* 4 CATCHMENT 100.000 ID No.ó 99999

Page 1

103224.OUT .038 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .000 .000 .000 .000 c.m/s .077 .000 .077 C perv/imperv/total 15 ADD RUNOFF .000 .000 .000 .000 c.m/s 35 COMMENT 3 line(s) of comment ************* * AREA 102 * ************* 4 CATCHMENT 102.000 ID No.ó 99999 .089 Area in hectares 15.000 Length (PERV) metres 2.000 Gradient (%) 2.900 Per cent Impervious 15.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .001 .000 .000 .000 c.m/s .077 .832 .099 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW TO SOUTH PROPERTY LINE * ************************************* 15 ADD RUNOFF .001 .001 .000 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment *********************** * PROPOSED CONDITIONS * *********************** 35 COMMENT 3 line(s) of comment ************* * AREA 100 * ************* 4 CATCHMENT 101.000 ID No.ó 99999 .038 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .000 .000 .000 .000 c.m/s .077 .000 .077 C perv/imperv/total 15 ADD RUNOFF .000 .000 .000 .000 c.m/s

Page 2

103224.OUT 9 ROUTE .000 Conduit Length .000 No Conduit defined .000 Zero lag .000 Beta weighting factor .000 Routing timestep 0 No. of sub-reaches .000 .000 .000 .000 c.m/s 17 COMBINE 500 Junction Node No. .000 .000 .000 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 201 * ************ 4 CATCHMENT 201.000 ID No.ó 99999 .042 Area in hectares 10.000 Length (PERV) metres 1.000 Gradient (%) 100.000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n" 98.000 SCS Curve No or C .000 Ia/S Coefficient .518 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .010 .000 .000 .000 c.m/s .831 .831 .831 C perv/imperv/total 15 ADD RUNOFF .010 .010 .000 .000 c.m/s 35 COMMENT 3 line(s) of comment **************************** * BUILDING ROOFTOP STORAGE * **************************** 10 POND 7 Depth - Discharge - Volume sets .000 .000 .0 .025 .00190 .1 .051 .00380 .8 .076 .00570 2.7 .102 .00760 6.3 .127 .00950 12.3 .152 .0114 21.2 Peak Outflow = .005 c.m/s Maximum Depth = .069 metres Maximum Storage = 2. c.m .010 .010 .005 .000 c.m/s 17 COMBINE 500 Junction Node No. .010 .010 .005 .005 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 202 * ************ 4 CATCHMENT 202.000 ID No.ó 99999 .031 Area in hectares 10.000 Length (PERV) metres 1.000 Gradient (%) 100.000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n"

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103224.OUT 98.000 SCS Curve No or C .000 Ia/S Coefficient .518 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .007 .000 .005 .005 c.m/s .831 .831 .831 C perv/imperv/total 15 ADD RUNOFF .007 .007 .005 .005 c.m/s 9 ROUTE .000 Conduit Length .000 No Conduit defined .000 Zero lag .000 Beta weighting factor .000 Routing timestep 0 No. of sub-reaches .007 .007 .007 .005 c.m/s 17 COMBINE 500 Junction Node No. .007 .007 .007 .011 c.m/s 18 CONFLUENCE 500 Junction Node No. .007 .011 .007 .000 c.m/s 35 COMMENT 3 line(s) of comment ************ * AREA 203 * ************ 4 CATCHMENT 203.000 ID No.ó 99999 .055 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) 74.500 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .009 .011 .007 .000 c.m/s .077 .822 .632 C perv/imperv/total 15 ADD RUNOFF .009 .020 .007 .000 c.m/s 35 COMMENT 3 line(s) of comment ************************************* * ROUTE THROUGH UNDERGROUND/STORAGE * ************************************* 10 POND 13 Depth - Discharge - Volume sets .000 .000 .0 .320 .00473 2.6 .420 .00549 5.3 .520 .00616 7.9 .620 .00676 10.6 .680 .00709 13.1 1.400 .0103 13.2 1.450 .0105 13.3 1.500 .0107 16.0 1.550 .0109 23.1 1.600 .0110 35.2 1.650 .0559 52.4 1.700 .138 69.0 Peak Outflow = .007 c.m/s Maximum Depth = .649 metres Maximum Storage = 12. c.m .009 .020 .007 .000 c.m/s 16 NEXT LINK .009 .007 .007 .000 c.m/s 35 COMMENT 3 line(s) of comment ************

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103224.OUT * AREA 205 * ************ 4 CATCHMENT 205.000 ID No.ó 99999 .009 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) 54.100 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .001 .007 .007 .000 c.m/s .077 .822 .480 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW WEST TO LESTER STREET * ************************************* 15 ADD RUNOFF .001 .007 .007 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 204 * ************ 4 CATCHMENT 204.000 ID No.ó 99999 .005 Area in hectares 10.000 Length (PERV) metres 30.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .000 .000 .007 .000 c.m/s .076 .000 .076 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW TO SOUTH PROPERTY LINE * ************************************* 15 ADD RUNOFF .000 .000 .007 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 4 line(s) of comment ************************************ * 5 YEAR CHICAGO STORM * * CITY OF WATERLOO IDF PARAMETERS * ************************************ 2 STORM 1 1=Chicago;2=Huff;3=User;4=Cdn1hr;5=Historic 1755.000 Coefficient a 12.347 Constant b (min) .895 Exponent c .400 Fraction to peak r 180.000 Duration ó 180 min 47.549 mm Total depth 3 IMPERVIOUS 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n"

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103224.OUT 98.000 SCS Curve No or C .100 Ia/S Coefficient .518 Initial Abstraction 35 COMMENT 3 line(s) of comment *********************** * EXISTING CONDITIONS * *********************** 35 COMMENT 3 line(s) of comment ************* * AREA 102 * ************* 4 CATCHMENT 102.000 ID No.ó 99999 .053 Area in hectares 15.000 Length (PERV) metres 2.000 Gradient (%) 75.400 Per cent Impervious 15.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .013 .000 .007 .000 c.m/s .151 .872 .695 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************ * TOTAL FLOW WEST TO LESTER STREET * ************************************ 15 ADD RUNOFF .013 .013 .007 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************* * AREA 100 * ************* 4 CATCHMENT 100.000 ID No.ó 99999 .038 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .001 .000 .007 .000 c.m/s .151 .000 .151 C perv/imperv/total 15 ADD RUNOFF .001 .001 .007 .000 c.m/s 35 COMMENT 3 line(s) of comment ************* * AREA 102 * ************* 4 CATCHMENT 102.000 ID No.ó 99999 .089 Area in hectares 15.000 Length (PERV) metres 2.000 Gradient (%) 2.900 Per cent Impervious 15.000 Length (IMPERV) .000 %Imp. with Zero Dpth

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103224.OUT 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .002 .001 .007 .000 c.m/s .151 .872 .172 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW TO SOUTH PROPERTY LINE * ************************************* 15 ADD RUNOFF .002 .003 .007 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment *********************** * PROPOSED CONDITIONS * *********************** 35 COMMENT 3 line(s) of comment ************* * AREA 100 * ************* 4 CATCHMENT 101.000 ID No.ó 99999 .038 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .001 .000 .007 .000 c.m/s .151 .000 .151 C perv/imperv/total 15 ADD RUNOFF .001 .001 .007 .000 c.m/s 9 ROUTE .000 Conduit Length .000 No Conduit defined .000 Zero lag .000 Beta weighting factor .000 Routing timestep 0 No. of sub-reaches .001 .001 .001 .000 c.m/s 17 COMBINE 500 Junction Node No. .001 .001 .001 .001 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 201 * ************ 4 CATCHMENT 201.000 ID No.ó 99999 .042 Area in hectares 10.000 Length (PERV) metres 1.000 Gradient (%) 100.000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n" 98.000 SCS Curve No or C

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103224.OUT .000 Ia/S Coefficient .518 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .013 .000 .001 .001 c.m/s .870 .870 .870 C perv/imperv/total 15 ADD RUNOFF .013 .013 .001 .001 c.m/s 35 COMMENT 3 line(s) of comment **************************** * BUILDING ROOFTOP STORAGE * **************************** 10 POND 7 Depth - Discharge - Volume sets .000 .000 .0 .025 .00190 .1 .051 .00380 .8 .076 .00570 2.7 .102 .00760 6.3 .127 .00950 12.3 .152 .0114 21.2 Peak Outflow = .006 c.m/s Maximum Depth = .085 metres Maximum Storage = 4. c.m .013 .013 .006 .001 c.m/s 17 COMBINE 500 Junction Node No. .013 .013 .006 .007 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 202 * ************ 4 CATCHMENT 202.000 ID No.ó 99999 .031 Area in hectares 10.000 Length (PERV) metres 1.000 Gradient (%) 100.000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n" 98.000 SCS Curve No or C .000 Ia/S Coefficient .518 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .010 .000 .006 .007 c.m/s .870 .870 .870 C perv/imperv/total 15 ADD RUNOFF .010 .010 .006 .007 c.m/s 9 ROUTE .000 Conduit Length .000 No Conduit defined .000 Zero lag .000 Beta weighting factor .000 Routing timestep 0 No. of sub-reaches .010 .010 .010 .007 c.m/s 17 COMBINE 500 Junction Node No. .010 .010 .010 .015 c.m/s 18 CONFLUENCE 500 Junction Node No. .010 .015 .010 .000 c.m/s 35 COMMENT 3 line(s) of comment ************ * AREA 203 * ************ 4 CATCHMENT 203.000 ID No.ó 99999

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103224.OUT .055 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) 74.500 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .013 .015 .010 .000 c.m/s .151 .858 .678 C perv/imperv/total 15 ADD RUNOFF .013 .028 .010 .000 c.m/s 35 COMMENT 3 line(s) of comment ************************************* * ROUTE THROUGH UNDERGROUND/STORAGE * ************************************* 10 POND 13 Depth - Discharge - Volume sets .000 .000 .0 .320 .00473 2.6 .420 .00549 5.3 .520 .00616 7.9 .620 .00676 10.6 .680 .00709 13.1 1.400 .0103 13.2 1.450 .0105 13.3 1.500 .0107 16.0 1.550 .0109 23.1 1.600 .0110 35.2 1.650 .0559 52.4 1.700 .138 69.0 Peak Outflow = .011 c.m/s Maximum Depth = 1.511 metres Maximum Storage = 18. c.m .013 .028 .011 .000 c.m/s 16 NEXT LINK .013 .011 .011 .000 c.m/s 35 COMMENT 3 line(s) of comment ************ * AREA 205 * ************ 4 CATCHMENT 205.000 ID No.ó 99999 .009 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) 54.100 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .002 .011 .011 .000 c.m/s .151 .858 .533 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW WEST TO LESTER STREET * ************************************* 15 ADD RUNOFF .002 .011 .011 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment

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103224.OUT ************ * AREA 204 * ************ 4 CATCHMENT 204.000 ID No.ó 99999 .005 Area in hectares 10.000 Length (PERV) metres 30.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .000 .000 .011 .000 c.m/s .150 .000 .150 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW TO SOUTH PROPERTY LINE * ************************************* 15 ADD RUNOFF .000 .000 .011 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 4 line(s) of comment ************************************ * 100 YEAR CHICAGO STORM * * CITY OF WATERLOO IDF PARAMETERS * ************************************ 2 STORM 1 1=Chicago;2=Huff;3=User;4=Cdn1hr;5=Historic 4692.000 Coefficient a 17.437 Constant b (min) .956 Exponent c .400 Fraction to peak r 180.000 Duration ó 180 min 89.960 mm Total depth 3 IMPERVIOUS 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n" 98.000 SCS Curve No or C .100 Ia/S Coefficient .518 Initial Abstraction 35 COMMENT 3 line(s) of comment *********************** * EXISTING CONDITIONS * *********************** 35 COMMENT 3 line(s) of comment ************* * AREA 102 * ************* 4 CATCHMENT 102.000 ID No.ó 99999 .053 Area in hectares 15.000 Length (PERV) metres 2.000 Gradient (%) 75.400 Per cent Impervious 15.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .024 .000 .011 .000 c.m/s .314 .906 .760 C perv/imperv/total

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103224.OUT 35 COMMENT 3 line(s) of comment ************************************ * TOTAL FLOW WEST TO LESTER STREET * ************************************ 15 ADD RUNOFF .024 .024 .011 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************* * AREA 100 * ************* 4 CATCHMENT 100.000 ID No.ó 99999 .038 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .006 .000 .011 .000 c.m/s .314 .000 .314 C perv/imperv/total 15 ADD RUNOFF .006 .006 .011 .000 c.m/s 35 COMMENT 3 line(s) of comment ************* * AREA 102 * ************* 4 CATCHMENT 102.000 ID No.ó 99999 .089 Area in hectares 15.000 Length (PERV) metres 2.000 Gradient (%) 2.900 Per cent Impervious 15.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .013 .006 .011 .000 c.m/s .314 .906 .331 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW TO SOUTH PROPERTY LINE * ************************************* 15 ADD RUNOFF .013 .019 .011 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment *********************** * PROPOSED CONDITIONS * *********************** 35 COMMENT 3 line(s) of comment ************* * AREA 100 * ************* 4 CATCHMENT 101.000 ID No.ó 99999

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103224.OUT .038 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .006 .000 .011 .000 c.m/s .314 .000 .314 C perv/imperv/total 15 ADD RUNOFF .006 .006 .011 .000 c.m/s 9 ROUTE .000 Conduit Length .000 No Conduit defined .000 Zero lag .000 Beta weighting factor .000 Routing timestep 0 No. of sub-reaches .006 .006 .006 .000 c.m/s 17 COMBINE 500 Junction Node No. .006 .006 .006 .006 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 201 * ************ 4 CATCHMENT 201.000 ID No.ó 99999 .042 Area in hectares 10.000 Length (PERV) metres 1.000 Gradient (%) 100.000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n" 98.000 SCS Curve No or C .000 Ia/S Coefficient .518 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .024 .000 .006 .006 c.m/s .903 .903 .903 C perv/imperv/total 15 ADD RUNOFF .024 .024 .006 .006 c.m/s 35 COMMENT 3 line(s) of comment **************************** * BUILDING ROOFTOP STORAGE * **************************** 10 POND 7 Depth - Discharge - Volume sets .000 .000 .0 .025 .00190 .1 .051 .00380 .8 .076 .00570 2.7 .102 .00760 6.3 .127 .00950 12.3 .152 .0114 21.2 Peak Outflow = .009 c.m/s Maximum Depth = .120 metres Maximum Storage = 11. c.m .024 .024 .009 .006 c.m/s 17 COMBINE 500 Junction Node No. .024 .024 .009 .015 c.m/s 14 START

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103224.OUT 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 202 * ************ 4 CATCHMENT 202.000 ID No.ó 99999 .031 Area in hectares 10.000 Length (PERV) metres 1.000 Gradient (%) 100.000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .013 Manning "n" 98.000 SCS Curve No or C .000 Ia/S Coefficient .518 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .018 .000 .009 .015 c.m/s .903 .903 .903 C perv/imperv/total 15 ADD RUNOFF .018 .018 .009 .015 c.m/s 9 ROUTE .000 Conduit Length .000 No Conduit defined .000 Zero lag .000 Beta weighting factor .000 Routing timestep 0 No. of sub-reaches .018 .018 .018 .015 c.m/s 17 COMBINE 500 Junction Node No. .018 .018 .018 .027 c.m/s 18 CONFLUENCE 500 Junction Node No. .018 .027 .018 .000 c.m/s 35 COMMENT 3 line(s) of comment ************ * AREA 203 * ************ 4 CATCHMENT 203.000 ID No.ó 99999 .055 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) 74.500 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .024 .027 .018 .000 c.m/s .314 .884 .739 C perv/imperv/total 15 ADD RUNOFF .024 .051 .018 .000 c.m/s 35 COMMENT 3 line(s) of comment ************************************* * ROUTE THROUGH UNDERGROUND/STORAGE * ************************************* 10 POND 13 Depth - Discharge - Volume sets .000 .000 .0 .320 .00473 2.6 .420 .00549 5.3 .520 .00616 7.9 .620 .00676 10.6 .680 .00709 13.1

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103224.OUT 1.400 .0103 13.2 1.450 .0105 13.3 1.500 .0107 16.0 1.550 .0109 23.1 1.600 .0110 35.2 1.650 .0559 52.4 1.700 .138 69.0 Peak Outflow = .023 c.m/s Maximum Depth = 1.614 metres Maximum Storage = 40. c.m .024 .051 .023 .000 c.m/s 16 NEXT LINK .024 .023 .023 .000 c.m/s 35 COMMENT 3 line(s) of comment ************ * AREA 205 * ************ 4 CATCHMENT 205.000 ID No.ó 99999 .009 Area in hectares 10.000 Length (PERV) metres 2.000 Gradient (%) 54.100 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .003 .023 .023 .000 c.m/s .314 .884 .622 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW WEST TO LESTER STREET * ************************************* 15 ADD RUNOFF .003 .024 .023 .000 c.m/s 14 START 1 1=Zero; 2=Define 35 COMMENT 3 line(s) of comment ************ * AREA 204 * ************ 4 CATCHMENT 204.000 ID No.ó 99999 .005 Area in hectares 10.000 Length (PERV) metres 30.000 Gradient (%) .000 Per cent Impervious 10.000 Length (IMPERV) .000 %Imp. with Zero Dpth 1 Option 1=SCS CN/C; 2=Horton; 3=Green-Ampt; 4=Repeat .250 Manning "n" 66.000 SCS Curve No or C .100 Ia/S Coefficient 13.085 Initial Abstraction 1 Option 1=Trianglr; 2=Rectanglr; 3=SWM HYD; 4=Lin. Reserv .001 .000 .023 .000 c.m/s .309 .000 .309 C perv/imperv/total 35 COMMENT 3 line(s) of comment ************************************* * TOTAL FLOW TO SOUTH PROPERTY LINE * ************************************* 15 ADD RUNOFF .001 .001 .023 .000 c.m/s 20 MANUAL

Page 14

IBI GROUP FINAL

246-248 Lester Street City of Waterloo Stormwater Management Report Submitted to Lester Development Inc.

July 21, 2017 C-1

Appendix C – Geotechnical Investigation