location and type of pipe network

J.F. Sabourin et associés inc. 2368 St-Louis, unité 101, Gatineau, QC J8V 1A2

tél.: 819.243.6858, téléc.: 819.243.8194 Windmill Development Group May 17th, 2016 6 Booth Street (Albert Island) Our file: 1163-04 Ottawa, Ontario K1R 6K8 Attention: Scott Bentley, CD CTech – Project Manager

Object: Findings: Detailed Study of Ville de Gatineau Sanitary Trunk Sewer Connection to the Domtar

Lands Redevelopment - Ontario

Mr Bentley,

JFSA’s services were solicited for the detailed study of Ville de Gatineau sanitary trunk sewer’s residual

capacity to evaluate its ability to accept additional wastewater flow from the Zibi-Ottawa development

project. Hence, a master plan was necessary for subcatchments 56 to 58, as shown in Figure 1, to

estimate the flowrates generated by each area, at their current state as well as their ultimate projected

state. This document serves as an executive summary and a brief description of JFSA’s findings. For

more ample detail, please refer to the complete report (JFSA, 2016).

LOCATION AND TYPE OF PIPE NETWORK

The area of study includes subcatchments 56 to 58 as delimited in the sanitary sewer master plan (JFSA,

2013). Subcatchments 56 and 57 are entirely serviced by a pseudo-sanitary network. As for subcatchment

58, a sanitary network is present. Figure 1 illustrates the limits of each subcatchment studies, drawn in red.

Also shown are Zibi-Ottawa and Zibi-Quebec residential projects, drawn in yellow and green respectively.

Windmill Development Group ND : 1163-04

J.F. Sabourin et associés inc. Experts-conseils en ressources hydriques et en environnement de 6

Figure 1 : Location of area of study



SIMULATION OF ACTUAL AND ULTIMATE PROJECTED CONDITIONS

Considering that the additional wastewater flowrates generated by the Zibi-Ottawa residential project will be

received by the Ville de Gatineau’s network and taking into account that this network will be subject to

considerable densification in the project future, the following scenarios were evaluated:

1) Simulation of actual conditions : Injection of additional wastewater flow from the Zibi-Ottawa project

into the pseudo-sanitary pipe (900 mm) on Eddy Street with actual flows generated by each sub

catchment;

2) Simulation of ultimate projected conditions: Injection of additional wastewater flow from the Zibi-

Ottawa project into the pseudo-sanitary pipe (900 mm) on Eddy Street with flows generated by each

sub catchment at their ultimate projected state. Ville de Gatineau projects a density of 100 housing

units per hectare for land currently being used for residential purposes as well as parking lots.

For the title drain contribution and for each scenario, a 100-year recurrence adjusted for climate changes

was simulated for the evaluation of residual capacity of Ville de Gatineau’s Sanitary Trunk Sewer

Connection to the Domtar Lands Redevelopment. Figure 2 shows pseudo-sanitary pipe servicing Zibi-

Ottawa.

Please note that, with the absence of flow measurement data for either sub catchment, the models used

could not be calibrated for this study.

Table 1 and Table 2 show the capacity of the conduit receiving Zibi-Ottawa’s sanitary flow as well as the

peak flowrates for each subcatchment and residential project, considering actual and ultimate projected

conditions respectively.

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Rue Eddy

Rue Laurier

Promenade du Portage

Rue Saint-Jacques

Rue Leduc

Rue Eddy

Rue Eddy

3103231031

31030

28931

28930

81518146

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8156

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8089

8047

2994029941

28054

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28055

Projet :

CONCEPT :DRAWN:

VERIF.REVIEW:

NO. PROJ

DRAWING REF.

Par:

Client:

FIGURE 2MR

1163-04May 2016

Master Plan for Sub catchments 56, 57 et 58

Titre :

Notes:

MR

VCP

Y:\Proj\1163\04 (Plan directeur)\Rapport

¹0 10 20 30 405

Mètres

LegendPseudo ConduitCollector ConduitSanitary Conduit

! Pseudo CB! Collector CB! Sanitary CB

Location of Receiving Conduit

VCP



Table 1 – Inlet flowrates and residual capacity for actual conditions

Flowrate (m³/s)

Capacity

1

Conduit # 11 231 (900Ø) 0.94

Wastewater inflows

Subcatchment 56 0.145



Kruger plant (600Ø full‐flow) 0.340

Zibi‐Ottawa 0.052

Zibi‐Gatineau (blocks 1 to 24) 0.053

Zibi‐Gatineau (blocks 25 and 26) 0.003

Residual Capacity 0.390

Note

1 Full‐flow capacity calculated with PCSWMM

Table 2 : Inlet flowrates and residual capacity for ultimate projected conditions

Flowrates (m³/s)

Capacity

1

Conduit # 11 231 (900Ø) 0.94

Wastewater inflows




Kruger plant (600Ø full‐flow) 0.340

Zibi‐Ottawa 0.052

Zibi‐Gatineau (blocks 1 to 24) 0.053

Zibi‐Gatineau (blocks 25 and 26) 0.003

Residual Capacity 0.347

Note

1 Full‐flow capacity calculated with PCSWMM

Worth noting the diameter of the pipes servicing Zibi-Gatineau’s residential project will have to be increased

to plan for the additional flowrates generated by the Zibi-Ottawa project.



CONCLUSIONS AND RECOMMENDATIONS

The detailed study performed on Ville de Gatineau’s network has validated its capacity to received additional

flowrates generated by the Zibi-Ottawa residential project located on Chaudière and Albert Islands. The

objective of this study was to evaluate the ability of Ville de Gatineau’s current pipe network to accept

wastewater flowrates generate by the Zibi projects (Ottawa and Quebec), using hydrological and hydraulic

modelling software, for actual and ultimate project states.

The capacity of the existing conduits located on Eddy Street and Alexandre-Taché Boulevard was therefore

analysed in the present study. In fact, the capacity of these conduits is sufficient to pass the required flowrate,

without creating surcharge, from the new Zibi-Ottawa development of 52 L/s. The residual pipe capacities

calculated through simulation for each scenario were 0.39 m³/s and 0.35 m³/s for actual and ultimate projected

respectively. Therefore, we confirm that this conduit can easily accommodate the sanitary flowrates coming

from the Zibi-Ottawa residential project.

Please note that the parameters used in the hydrological model were estimated through hypothesis and with

knowledge of certain characteristics of the sector studied. Hence, if the Ville de Gatineau desires to validate

these parameters, a calibration using flowrate measurements taken at key points should be performed.

Benoit Doré, M. ing. P. Eng.

Vanesa Carolin Pereira, ing. OIQ # 5045387

Marcel Roy, ing,

Directeur général de l’Outaouais

OIQ # 36996

cc Jean-François Sabourin, M. ing, ing, JFSA inc.

location and type of pipe network

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