Assignment Task

As discussed in class, the revised Term Project/home Exam will focus on the Brightwater development, and your task is to model and evaluate the proposed solutions for drinking water distribution, sanitary servicing, and storm drainage/stormwater management. The proposed development includes 2,693 residential units and a net site area of about 410,000 m⊃2; (41 ha). The Project is to be done in previously formed groups of two students per group, using EPANET 2.2 and USEPA SWMM 5.1 tools that were previously used in course assignments. This document provides background information for the project.

Water Distribution

There are existing water mains on Lakeshore Road (300 mm and 400 mm) and Mississauga Road (300 mm). The Region of Peel has identified the need to upgrade the water servicing in Pressure Zone 1 and has identified that a new 600 mm diameter water main is to be constructed along Lakeshore Road from the subject lands easterly to the existing Lakeview Water Treatment Plant located south of Lakeshore Road on Cawthra Road, 4.1 km from the development site (see Figure 1). This new 600 mm diameter water main is identified as Regional Project 18-1119 in the Region’s 2015 Capital Budget and is funded through Development Charges. This watermain is expected to be in service, however it is not required for the proposed development on the subject lands.

Your task is to carry out a hydraulic analysis of the proposed development as it relates to the existing and proposed infrastructure. The analysis was based on Region of Peel 2016 Design Criteria. All scenarios were modeled without the proposed 600 mm water main on Lakeshore Road. Modelling of the City of Mississauga Pressure Zone 1, shown in Figure 2, indicated that the proposed development can be serviced without the proposed 600 mm water main on Lakeshore Road, even under the 2027 maximum day demand conditions.

Region of Peel Pressure Zone 1 junctions

A network of municipal water mains is proposed throughout the subject lands, as indicated a separate document, entitled Preliminary Water Distribution Plan.pdf on the course D2L. Using the Region of Peel Watermain Desing.

1. Develop the EPANET model of the proposed water distribution network for development. The grading plan will provide the approximate elevations of connections, and the depth of junctions should follow the Region of Peel standard.

2. Analyze the network pressures under the following loading conditions: Average Day Demand (ADD), Maximum Day Demand (MDD) and Peak Hour Demand (PHD), assuming the pressure available in the existing network at the edge of the proposed development is 82.6 psi on Lakeshore Rd., West of Mississauga Road, and 89.7 psi on Mississauga Rd., South of Lakeshore Rd. (Hints: supply from the existing municipal water mains should be modeled as tanks, similar to Assignment 1 supply, with appropriate heads)

3. Provide a summary report of the flows and pressures in the development and determine if the following conditions are met by the proposed design:

• Minimum acceptable pressure - 275 kPa (40 psi) (Ministry of the Environment Design Guidelines for Drinking-Water Systems and Region of Peel Water System Design Criteria)
• Maximum acceptable velocity – 2 m/s (Ministry of the Environment Design Guidelines for Drinking-Water Systems)

Sanitary Servicing

The Front Street Sewage Pumping Station (SPS) is located to the east of the subject site at the southeast corner of Lakeshore Road and Front Street and services a 166 hectare drainage area representing a mixture of residential and commercial lands. The Region of Peel identified that this pump station has significant excess service capacity available to service the subject site. The Region of Peel has identified the need to upgrade the wastewater infrastructure and has identified that a new gravity trunk sanitary sewer will be constructed along the frontage of the site to the Front Street SPS.

One of the outcomes of the proposed trunk sanitary sewer will be the removal of the existing Front Street SPS. The proposed Lakeshore Trunk is currently in the Environmental Assessment (EA) process and is anticipated to be submitted to the MOE in 2018 with approvals expected later that year. The Region’s Draft Master Plan identifies this as Project WW-ST-163 with a planned in-service date of 2022. The proposed Lakeshore Trunk sewer is not considered in the proposed sanitary plan.

Stormwater Management

As shown in the Development Phasing and Block Identification map, the proposed land use for the proposed development consists of several public right-of-ways and private site plan blocks, including:

• Mixed use blocks including a campus
• High-density residential block
• A commercial development blocks
• Park blocks/Open space
• Public ROWs

The detailed grading for the development has been designed in accordance with City of Mississauga standards. Grading on the subject lands is generally governed by the existing boundary conditions, particularly the boundary roads and common property lines. Road grading has also been designed to ensure that adequate cover over proposed services is maintained. With the exception of the proposed Mississauga Road grading, no external grading works are proposed and there shall be no grading onto private properties external to the subject lands. Detailed grading plans have been prepared for the subject lands based on the following engineering constraints: