Ridgewood South Precinct Plan Servicing Infrastructure Stantec Project #

Transcription

1 Ridgewood South Precinct Plan Servicing Infrastructure Stantec Project # Prepared By: Stantec Consulting Ltd. 905 Waverley Street Winnipeg Manitoba R3T 5P4 September 18, 2012

2 Introduction The servicing concepts presented for the Ridgewood South Precinct Plan are intended to indicate the general arrangement of major watermains, wastewater sewers and land drainage facilities that will be required to service the precinct. The concepts are based on data acquired from and discussions held with representatives of the Water and Waste Department of the City of Winnipeg. It is understood that there is capacity in the existing water feedermain and wastewater interceptor sewer systems for the Ridgewood South Precinct. While the general routing of proposed major services is shown, this does not preclude alternative routings. Any design will be subject to detailed technical investigations to assess available capacity, terrain gradients, servicing demands and any required existing system upgrades. The final servicing design will not only depend on these factors, but as well on street layouts, servicing sequences, schedules and cost sharing resolutions. Such detailed design is beyond the parameters of a Precinct Plan.

3 Figures Figure 1: Existing Major Watermains Figure 2: Existing Major Wastewater Sewers Figure 3: Existing Land Drainage Sewers & Catchment Areas Figure 4: Proposed Major Watermains Figure 5: Proposed Major Wastewater Sewers Figure 6: Proposed Major Land Drainage Systems klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx E.2

4 Table of Contents 1.0 INFRASTRUCTURE EXISTING INFRASTRUCTURE Existing Water Services Existing Wastewater Sewers Existing Land Drainage Infrastructure PROPOSED INFRASTRUCTURE PROPOSED WATER DISTRIBUTION SYSTEM PROPOSED WASTEWATER SEWER SYSTEM PROPOSED LAND DRAINAGE SEWER SYSTEM Westdale Land Drainage Area Civic-McCallum Land Drainage Area Land Drainage Area Grant / Haney Trunk System Grant / Elmhurst Trunk System klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx i

5 Infrastructure September 14, Infrastructure 1.1 EXISTING INFRASTRUCTURE Existing Water Services Figure 1 shows the existing major distribution watermains relevant to the servicing of Ridgewood South, including 250 mm and 300 mm diameter watermains plus large diameter feedermain piping. Charleswood is serviced by a major water feedermain system comprised of the 450 mm / 600 mm / 750 mm Charleswood / Assiniboine feedermain loop along, Betsworth Avenue and Berkley Street; and the 750 mm / 900 mm / Wilkes / Haney feedermain loop along,, Ridgewood Avenue, and. There are feed points from this system at a number of locations throughout Charleswood that distribute water for domestic consumption and provide firefighting demand flows through a network of major and local watermains Existing Wastewater Sewers Figure 2 shows the existing major wastewater sewers and catchment areas relevant to the servicing of Ridgewood South. Charleswood is presently serviced by the Charleswood Interceptor sewer system in which a 1350 mm wastewater trunk sewer collects wastewater on Grant Avenue routing west and ultimately south in, then west in to the Perimeter Pump station and which sends sewage by forcemain to the West End Water Pollution Control Centre. The system is understood to have sufficient capacity to accommodate infill development in Charleswood as well as Ridgewood South Existing Land Drainage Infrastructure Land drainage services for Ridgewood South have been investigated over the years in a series of studies for the City of Winnipeg. Figure 3 shows the existing major land drainage sewers and catchment areas relevant to the servicing of Ridgewood South. The latest land drainage study was produced by AECOM and presented to the City in draft report in The study closely followed the catchment boundaries previously adopted by the City which extended south of to the City/RM of Macdonald boundary at Finklestein Road. The initial elements of the major land drainage trunk sewer systems for each of these catchments, including outfalls to the Assiniboine River, have been installed and trunk sewers extended, varying in length within each catchment. klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx 1.1

6 Charleston Road V:\1168\active\ \drawing\401_predesign\options\Final Report\Revised Figures September 2012\Ridgewood-Report_ServicingFigures.dwg 10/27/2010 4:28:47 PM CNR Rivers Mainline Ridgewood Avenue Civic Street Southboine Drive 600 Ø ROUGE ROAD FEEDERMAIN 8 Landmark 600 Ø FEEDERMAIN Assiniboine River 450 Ø FEEDERMAIN 4 EX. 200 WM Pepperloaf Cr Liberty Street Loudoun Road 750 Ø FM Elmhurst Rd (Two Mile Road) 900 Ø FEEDERMAIN 750 Ø FM Buckingham Road 750 Ø FEEDERMAIN EX. 200 WM Coventry Road 750 Ø FEEDERMAIN Laxdal Road Dieppe Road 750 Ø FEEDERMAIN EX. 200 WM 7 6 PROPOSED WATERMAIN EXISTING WATERMAIN EXISTING FEEDERMAIN 600 Ø FEEDERMAIN 750 Ø FEEDERMAIN Grant Avenue Existing Major Watermains Figure 1

7 V:\1168\active\ \drawing\401_predesign\options\Final Report\Revised Figures September 2012\Ridgewood-Report_ServicingFigures.dwg 10/27/2010 4:28:47 PM Charleston Road 750WWS Civic Street 400 WWS 900 WWS G PERIMETER PUMP STATION 8 Landmark 1350 WWS CNR Rivers Mainline Liberty Street Loudoun Road Elmhurst Rd (Two Mile Road) Buckingham Road Ridgewood Avenue Coventry Road EX. 300 WWS Pepperloaf Cr EX. 300 WWS Laxdal Road Dieppe Road 1350 WWS 1350 WWS COMMUNITY ROW PUMPING STATION ELMHURST PUMPING STATION 4 7 PROPOSED WASTEWATER SEWER EXISTING WASTEWATER SEWER EXISTING INTERCEPTOR SEWER WASTEWATER SEWER CATCHMENT EX. 400 WWS EX. 300 WWS EX. 300 WWS EX. 450 WWS EX. 375 WWS Grant Avenue 1200 WWS Existing Major Wastewater Sewers Figure 2

8 V:\1168\active\ \drawing\401_predesign\options\Final Report\Revised Figures September 2012\Ridgewood-Report_ServicingFigures.dwg 10/27/2010 4:28:47 PM Southboine Drive Charleston Road Liberty Street Loudoun Road 2 5 (Two Mile Road) 1500 LDS Buckingham Road Coventry Road 900 LDS 600 LDS 1350 LDS Ridgewood Avenue Laxdal Road 1350 LDS PROPOSED LAND DRAINAGE SEWER EXISTING LAND DRAINAGE SEWER LAND DRAINAGE SEWER CATCHMENT CNR Rivers Mainline Pepperloaf Cr Civic Street Dieppe Road 1800 LDS Grant Avenue Grant Avenue Assiniboine River Existing Land Drainage Sewers & Catchment Areas Landmark Figure 3

9 Infrastructure September 14, 2012 The study catchment plan defines the boundary between the area of a catchment to be drained by direct discharge to the Assiniboine River during a design storm event and the area in which runoff is to be directed to a stormwater retention basin (SRB) for later release to the trunk sewer outfall system when capacity becomes available after the storm event. Much of the existing developed area of Charleswood lies north of this boundary and is planned for direct drainage discharge to the river while all of Ridgewood South is south of the boundary in the area to be serviced by stormwater retention basins. There are 4 outfall systems which will provide land drainage service for Ridgewood South as follows: At the west end is the Westdale Land Drainage Area which outfalls to the river from a trunk sewer in Barker Boulevard. The trunk sewer extends south through River West Park and Westdale and terminates at the Harte Trail as a 1500 mm sewer. The next catchment to the east is the Civic-McCallum Land Drainage Area which outfalls to the river on McCallum Crescent. Like the Westdale system, the Civic McCallum system was originally designed as a gravity system with no retention basins. In 1984 a study prepared by Clark Solmondson and Associates Inc. and adopted by the City, demonstrated that land east of the Westdale catchment and extending south of originally included in the Harstone outfall system could be added to the Civic-McCallum land drainage area, through the addition of storm water retention and weir control. At present, two legs of the system, in Civic Street and in Scotswood Drive, are installed south to. The trunk sewer in Civic Street is sized at 900 mm at. The trunk sewer in Scotswood Drive is sized at 600 mm at. The next land drainage catchment to the east is the Land Drainage Area. Although this is the largest catchment system servicing Ridgewood South, it is least developed from a land drainage trunk sewer perspective. While an 1800 mm outfall to the river has been installed, the trunk sewer has only been extended 60 m south of Roblin Boulevard as an 1800 mm sewer with the remainder of the developed catchment serviced by roadside ditches. The final outfall system servicing Ridgewood South is the Grant Land Drainage Area. This system splits into two major catchment areas; at the intersection of and Eldridge Avenue, the Grant/Haney Trunk System and the Grant / Elmhurst Trunk System. Each of these catchment areas extends south of to the City boundary at Finklestein Road. Drainage infrastructure for the Grant system is well developed with a 2550 mm outfall to the river from just north of the Grant Avenue intersection. There is also a 2550 mm trunk sewer installed in Grant Avenue east to at which point the trunk sewer splits to a 1200 mm sewer extending easterly in Grant Avenue and a 1950 mm extending south in. At and the 1950 mm trunk again splits to service to the two catchment areas. A 1350 subtrunk sewer extends west in Eldridge Ave to. A 1500 mm subtrunk sewer extends east to Laxdal Road, klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx 1.2

10 Infrastructure September 14, 2012 then south as a 1350 mm sewer to Beiko Avenue where it turns east as a 1350 mm reducing to a 1050 mm sewer to. Here it ends as a trunk and connects to local sewers draining from the south, east and north. This subtrunk is designed to service the Grant / Elmhurst Trunk System. A future subtrunk is designated to extend south in (or the WRCP Extension) from to service the Grant/Haney Trunk System. klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx 1.3

11 Proposed Infrastructure September 14, Proposed Infrastructure 2.1 PROPOSED WATER DISTRIBUTION SYSTEM Figure 4 shows the proposed major watermains for the servicing of Ridgewood South. With the close proximity of the existing feedermain system, together with larger (200 mm / 250 mm / 300 mm) distribution watermains, the figure shows a proposed looped major watermain system to service Ridgewood South. Final watermain sizing will depend on detailed analysis but it appears reasonable that the major system would consist of 250 mm and 300 mm watermains. As any phase of development proceeds in Ridgewood South, the water distribution system would be extended to provide redundancy of supply by looping and adequate pressures to meet fire flow demands. 2.2 PROPOSED WASTEWATER SEWER SYSTEM Figure 5 shows the proposed major wastewater sewers for the servicing of Ridgewood South. There are several areas of Ridgewood South which, dependent on detailed analysis and any resultant necessary modifications, may connect to existing wastewater sewers discharging to the interceptor sewer system. These areas include Sub-Areas 7, 10, and 11. Area 7 is included in the design catchment serviced by the pump station at and Beiko Avenue, which discharges north in the 375 mm wastewater sewer in to the interceptor sewer in Grant Avenue. The detailed servicing analysis of this system will be impacted by the higher density residential development now proposed for Sub-Area 7. This could result in the need for pump station upgrades, and/or new upsized wastewater forcemain or gravity piping. Based on recent high level studies for Our Winnipeg by AECOM, the detailed Elmhurst system analysis should include an assessment as well of the Charleswood Interceptor system. The existing catchment area for Area 10 indicates that it can be connected north through existing development to the E/W leg of the Charleswood Interceptor in Betsworth; or west in Rannock to the N/E leg of the Charleswood Interceptor in. Both routes will require evaluation of existing local sewer capacity. Another alternative is extension of the undeveloped Area 9 wastewater sewer system connecting to the Interceptor. Other options, which would require detailed existing local sewer capacity assessment, is to divert the Area 10 wastewater to the adjacent Harstone catchment to the east, either at Rannock and/or at Glenbrush. Sub Area 9 lies in the same existing catchment area as Sub Area 10 and in theory has the same outfall routing options. The preferred routing however is direct connection west to the Interceptor Sewer in the adjacent. klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx 2.4

12 Charleston Road V:\1168\active\ \drawing\401_predesign\options\Final Report\Revised Figures September 2012\Ridgewood-Report_ServicingFigures.dwg 10/27/2010 4:28:47 PM CNR Rivers Mainline Ridgewood Avenue Civic Street Southboine Drive 600 Ø ROUGE ROAD FEEDERMAIN 8 Landmark 600 Ø FEEDERMAIN Assiniboine River 450 Ø FEEDERMAIN 4 EX. 200 WM Pepperloaf Cr Liberty Street Loudoun Road 750 Ø FM Elmhurst Rd (Two Mile Road) 900 Ø FEEDERMAIN 750 Ø FM Buckingham Road 750 Ø FEEDERMAIN EX. 200 WM Coventry Road 750 Ø FEEDERMAIN Laxdal Road Dieppe Road 750 Ø FEEDERMAIN EX. 200 WM 7 6 PROPOSED WATERMAIN EXISTING WATERMAIN EXISTING FEEDERMAIN 600 Ø FEEDERMAIN 750 Ø FEEDERMAIN Grant Avenue Proposed Major Watermains Figure 4

13 V:\1168\active\ \drawing\401_predesign\options\Final Report\Revised Figures September 2012\Ridgewood-Report_ServicingFigures.dwg 10/27/2010 4:28:47 PM 750WWS WWS 900 WWS G PERIMETER PUMP STATION Charleston Road CNR Rivers Mainline Liberty Street Loudoun Road Elmhurst Rd (Two Mile Road) Buckingham Road Ridgewood Avenue 1350 WWS Coventry Road EX. 300 WWS Pepperloaf Cr EX. 300 WWS Laxdal Road Civic Street Dieppe Road 1350 WWS 1350 WWS Grant Avenue COMMUNITY ROW PUMPING STATION 8 ALTERNATIVE WWS ROUTING CONCEPT ALTERNATIVE WWS ROUTING CONCEPTS 4 ALTERNATIVE WWS ROUTING CONCEPT 7 ELMHURST PUMPING STATION PROPOSED WASTEWATER SEWER EXISTING WASTEWATER SEWER EXISTING INTERCEPTOR SEWER WASTEWATER SEWER CATCHMENT EX. 400 WWS EX. 300 WWS EX. 300 WWS EX. 450 WWS EX. 375 WWS 1200 WWS Proposed Major Wastewater Sewers Landmark Figure 5

14 Proposed Infrastructure September 14, 2012 Sub-Area 11 is included in the catchment of the 300 wastewater sewer draining west in Eldridge Avenue. It is assumed that this undeveloped area north of the Harte Trail was included in the capacity design of the existing 450 mm subtrunk sewer discharging to the 1350 mm interceptor sewer in Grant Avenue. The remaining areas of Ridgewood South would connect directly to the 1350 mm wastewater interceptor sewer in. These are Sub-Areas 1, 2, 3, 4, 5, and 8. While a number of these Sub-Areas abut the interceptor sewer (Sub-Areas 1, 2, 3, and 9), Sub-Areas 4 and 5 must wait for a local subtrunk sewer to be extended east from the interceptor sewer. 2.3 PROPOSED LAND DRAINAGE SEWER SYSTEM Figure 5 shows the proposed major land drainage systems for the servicing of Ridgewood South. In general, the proposed land drainage systems closely follow the recommendations of the 2008 draft report An Evaluation of the Regional Land Drainage Plans for the Charleswood Area prepared by AECOM for the City. In the interim, the City has introduced design criteria adjustments which increase design runoff coefficients and retention basin freeboard with an objective to improve flooding safety margins which are particularly critical for walkout basements. These changes can be expected to impact somewhat on the conceptual sewer and storm retention basins (SRB) sizes given in the report, but this would be addressed in the final design. For the conceptual layout, the SRB s have been sized as linear naturalized lakes with an area at normal water level (NWL) assumed at 3.6% of the gross serviced catchment area. While the land drainage catchment boundaries (Fig 6) do not match those of the Ridgewood South Sub-Areas, the Sub-Areas are generally confined within one of the catchment areas. In a number of the Precinct areas, there is developed frontage on existing streets. In some instances the gravity/retention boundary of the catchment extends north of Ridgewood South. This means that new SRB s will be sized to provide retention for existing built up areas both within and outside Ridgewood South. A general description of the land drainage features that will be needed to provide for the development of Ridgewood South are described as follows, in sections 2.3.1, 2.3.2, 2.3.3, 2.3.4, and Westdale Land Drainage Area This system includes Sub-Areas 1, 2, and 8, and has a south boundary at. The final arrangement of the SRB s and interconnecting sewers is flexible within the catchment. The SRB s are shown in Sub-Areas 1 and 2. Since the connection to the existing Westdale 1500 mm trunk sewer occurs in Area 1, the sequence of land drainage facility development will start in Sub-Area 1 and as services are extended, be followed by Sub-Areas 2 and 8. It could be feasible to service Area 8 independently from Area 1 if area retention is provided and an outfall sewer is installed west in the Harte Trail alignment to the 1500 mm Westdale trunk sewer. klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx 2.5

15 V:\1168\active\ \drawing\401_predesign\options\Final Report\Revised Figures September 2012\Ridgewood-Report_ServicingFigures.dwg 10/27/2010 4:28:47 PM LDS Weir Charleston Road Liberty Street Loudoun Road 3 (Two Mile Road) Weir ALTERNATIVE LDS ROUTING CONCEPT ORIGINAL LDS ROUTING CONCEPT Weir Weir Buckingham Road Weir Coventry Road 900 LDS 600 LDS 1350 LDS Ridgewood Avenue Laxdal Road 1350 LDS PROPOSED LAND DRAINAGE SEWER EXISTING LAND DRAINAGE SEWER LAND DRAINAGE SEWER CATCHMENT LINEAR STORM WATER RETENTION BASINS CNR Rivers Mainline Pepperloaf Cr Civic Street Dieppe Road 1800 LDS Grant Avenue Grant Avenue Proposed Major Land Drainage Systems Landmark Figure 6

16 Proposed Infrastructure September 14, Civic-McCallum Land Drainage Area This system includes Sub-Areas 3 and 9 and the total catchment area extends south of Wilkes Avenue (Fig 5). A series of linear naturalized SRB s would interconnect by trunk sewers to the existing 900 mm trunk sewer in Civic Street at. A weir would be installed on the existing sewer in Civic Street north of at the gravity / retention boundary. Provision would be made to extend the interconnecting sewers to to accommodate future development. Land drainage servicing sequence in the Civic-McCallum Land Drainage Area would start with Sub- Area 9 and progress to Sub-Area 3. It should be noted that it may be feasible, based on a future detailed analysis at the development application stage, to add Sub-Area 10 to the Civic-McCallum system by the incorporation of additional SRB area at NWL, either in Sub-Area 10 or by enlarging the Sub-Area 9 SRB or Sub-Area 3 SRB. Sub-Area 10 is presently planned as the last Ridgewood South area to be serviced to the Harstone Road Land Drainage Area Land Drainage Area The Land Drainage Area catchment (Figure 6) includes a large built up area of Charleswood north of the gravity/retention boundary, the retention areas north of the Harte Trail include existing development, and Ridgewood South Sub-Areas 10 and 11. The Ridgewood South precinct Areas 4 and 5 south of the Harte Trail and a large area south of extending to the City boundary at Finklestein Road. At present the 1800 mm Harstone Trunk Land Drainage sewer extends 60 meters south of Roblin Boulevard. The draft drainage report prepared by AECOM proposes this sewer be extended south in with a minimum size of 1200 mm to. A weir in the sewer just south of would define the gravity/retention boundary of the catchment areas. A system of storm retention basins, all located south of the Harte Trail, would connect to the proposed Harstone Trunk Sewer in Ridgewood South, although the SRB s would service retention Sub-Areas 10 and 11, as well as other built up areas north of the Harte Trail. Because most of the trunk would service only existing developed frontage with little expectation of a local improvement approval by the benefitting frontage, the financing of the trunk cost from a limited contributing area of new development under a TSR appeared unlikely and only viable if the City extended the trunk sewer to the Harte Trail. In seeking a more cost effective method of moving forward with the Drainage System, an alternative trunk alignment option is proposed. This involves extending the Harstone Trunk Sewer south to, east in to Dieppe Street and south in Dieppe Street to a weir on the gravity/retention boundary in Ridgewood South Sub-Area 11. From the weir a linear SRB would be constructed in Sub-Area 11 to the Harte Trail. The implementation advantage is that this klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx 2.6

17 Proposed Infrastructure September 14, 2012 option has a much shorter distance to reach new development where TSR payments become available. The present Harstone catchment (Fig 6) contribution concept assumes SRB capacity for Sub-Area 10 is located in Sub-Areas 4 and 5 south of the Harte Trail. If a detailed study demonstrated that capacity for Sub-Area 10 can be transferred to the Civic McCallum Drainage Area, then the Harstone catchment SRB capacity requirement south of the Harte Trail would be reduced Grant / Haney Trunk System The Grant / Haney Trunk System will service a catchment area of Ridgewood South including all of Sub-Area 6 and that portion of Sub-Area 7 west of the Liberty Avenue alignment, as well as the 24.4 ac transportation reserve (Fig 6). As set out in the draft drainage report by AECOM, a new 1350 mm trunk sewer will be extended south from the existing 1350 mm sewer in, in the William R Clement Parkway (WRCP), to a weir at the Harte Trail connecting to a SRB on City land south of the Harte Trail in Sub-Area 7. This sewer will service WCRP and it is assumed it will be installed as part of WRCP extension project. From the SRB a 1350 mm sewer will extend south from the SRB to Grant / Elmhurst Trunk System This system will service the east sector of Ridgewood South lying east of the Liberty Avenue alignment. The draft drainage report by AECOM proposes a 1350 mm extension of the Grant / Elmhurst Trunk system south from the existing 1350 mm trunk sewer in Beiko Avenue at Elmhurst Road to with a weir at the Harte Trail. A SRB shown on the east side of just south of the Harte Trail would provide Ridgewood South retention (Figure 6). klb v:\1168\active\ \report\1101_drafts\ridgewood_south_precinct_plan\rpt_8360_ridgewood_south_precinct_plan_ docx 2.7