LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 4.0 STORMWATER MANAGEMENT 4.1 EXISTING CONDITIONS Figure 4-1 shows the overall study area with associated stormwater infrastructure. In discussion with the City of Ottawa, no rehabilitation on the major sewers is planned within the next three years that would reduce trunk capacity. Similarly to the sanitary servicing, the major divides in the study area for storm servicing are Highway 417 and St. Laurent Boulevard. Overall, there are no major constraints on stormwater servicing in the study area. City staff have identified areas south of the Train study area to have shallow storm sewers and to be partially separated. Outlets to the Rideau River are influenced by the river’s water level however the zone of influence upstream in the sewer network has not yet been traced. There are few reports of flooding due to stormwater within the study area. rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.1 370000 372000 374000 ± 5032000 5032000 5030000 5030000 0 250 500 m 1:30,000 V:\01225\active\other_pc\163401180\GIS\MXD\Figure_Updates_18012013\163401180_Fig4-1_Stormwater_Trunk_Infra.mxdRevised: 2013-10-22 By: ncruikshank 370000 372000 374000 October 2013 Project No.: 163401180 Legend Notes Client/Project 1. Coordinate System: NAD 1983 MTM 9 City of Ottawa Pipe Diameter (mm) Blair TOD Study Area 2. Imagery: City of Ottawa Transit Oriented 1050 - 1350 Hurdman TOD Study Area Development Lees TOD Study Area 1351 - 2175 Figure No. Cyrville TOD Study Area 2176 - 4500 4-1 St. Laurent TOD Study Area Title Train TOD Study Area Stormwater Trunk Infrastructure - Overall Study Area LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT 4.1.1 Lees TOD Study Area This area covers approximately 81.6ha. The drainage area is split roughly by the Highway 417. Land use is predominantly residential, with institutional uses at the eastern TOD boundary and leisure and light industrial areas immediately north of the highway. Figure 4-2 presents the extents of the TOD area, and storm sewers in the region. Figure 4-2: Existing Storm Sewers, Lees TOD Study Area Sewers in the area south of the Highway are partially separated, whereas regions north of the Highway contain primarily combined sewers with some partially separated areas. City staff have identified that an EA was completed in regards to separation of sewers north of Highway 417, but was found not to be cost effective. The region maintains several outlets to the nearby Rideau River. No end-of-pipe quality controls have been noted for the region. rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.3 LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT 4.1.2 Hurdman TOD Study Area This area covers approximately 73.1ha. Drainage area land use is predominantly surface- drained greenspace, with commercial and residential uses at the east and south TOD boundary. Figure 4-3 presents the extents of the TOD area, and storm sewers in the region. Figure 4-3: Existing Storm Sewers, Hurdman TOD Study Area Sewers in the region generally drain northward to two major outfalls to the Rideau River. No end of pipe quality control has been reported for the region. Servicing in the area is constrained by the Rideau River’s water level. Although no capacity concerns have been identified by City staff, sanitary sewers in the area have potential to surcharge with impact to storm sewers in the region. rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.4 LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT 4.1.3 Train TOD Study Area This area covers about 100.9ha. The entire area discharges into the Rideau River via several different trunk sewers. Outlets to the Rideau River are influenced by the river’s water level. The area is considered as a partly separated sewer system. Figure 4-4 presents the extents and storm sewers. Figure 4-4: Existing Storm Sewers, Train TOD Study Area The study area is split by Highway 417. The area north of the Highway drains to the Rideau River via the Coventry Road storm sewer, which discharges just north of the RCMP facility. The pipes range in size from 2700 mm diameter at the outlet down to 1200 mm diameter at Belfast. East of Belfast, the sewer drains the St. Laurent Study Area as well as St. Laurent Boulevard rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.5 LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT north of Ogilvie. The study area north of the highway is mostly zoned Leisure and General Mixed Use. Most of the area south of the Highway discharges to the Tremblay Road storm trunk sewer just to the south. The southern portion of the study area is zoned Transit, Mixed Use, and Industrial. The Tremblay Road sewer ranges in size within the study area from 1650 mm in the east to 1950 mm in the west. Upstream of the site area, the sewer drains the St. Laurent Study Area – the St. Laurent Shopping Centre north of the Highway and residential areas south of the Highway, as well as the Transitway eastward past the Cyrville study area. The Tremblay Oil Interceptor treats flows at the outlet. A small portion in the southwest corner of the study area drains to a storm sewer that crosses Riverside Drive and runs northwest to the Rideau River, staying southwest of the existing Hurdman Transitway station. This sewer collects stormwater from the Industrial Avenue trunk sewer which begins just east of Russell Road. This trunk receives drainage from several residential communities south of Industrial, including areas near Coronation and Belena Parks. Several industrial areas also drain to the Industrial Avenue sewer. Within the study area, the sewer size is 1200 mm, which is the same size at the outlet to the Rideau River. The Alta Vista Oil Interceptor treats flows at the outlet. 4.1.4 St. Laurent TOD Study Area This area covers about 120.5ha. The area is split roughly by St. Laurent Boulevard and Highway 417. Land use north of the Highway is zoned Mixed Use, south of the Highway and west of St. Laurent Boulevard it is Residential, Leisure and Light Industrial, and south of the Highway and east of St. Laurent Boulevard land use is Light Industrial. Figure 4-5 presents the extents and storm sewers. Most of the area north of the Highway drains to the Coventry Road storm sewer described in the previous section. St. Laurent Boulevard north of Coventry Road (and a portion just south of it) drains to this sewer. Within this study area, this sewer ranges in size from 900 mm diameter on St. Laurent to 1350 mm diameter at Belfast. The area south of the Highway discharges to the Tremblay Road storm trunk sewer described in the previous section. Just west of St. Laurent Boulevard flows to St. Laurent Boulevard, flows drain to St. Laurent Boulevard and join with the area southeast of St. Laurent Boulevard and the Highway, outletting to a surface channel. rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.6 LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT Figure 4-5: Existing Storm Sewers, St. Laurent TOD Study Area rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.7 LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT 4.1.5 Cyrville TOD Study Area This area covers about 99.7ha. The collection area is split by Highway #417 and the interchange with Highway #174. The area north of the Highway discharges to an open channel that runs eastward under the Aviation Parkway. The ditch outlets to the Cyrville Artificial Wetlands (CAW), a City-maintained facility (originally designed for the Canadian Mortgage and housing Corporation – CMHC). The outlet structure on this facility was recently refurbished as part of an agreement with a developer. Figure 4-6 presents the extents and storm sewers. Figure 4-6: Existing Storm Sewers, Cyrville TOD Study Area rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.8 LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT The CAW discharges into the Cyrville Drain, which has Municipal Drain status under the Ontario Drainage Act. The Drain has two branches: the South Cyrville Drain, and the Cote’s-Martain Drain; see Figure 4-7 for details. Legal Municipal Drain status ends at the confluence of the two Drains, just northeast of the intersection of the Aviation Parkway and Highway 417. The Drains outlet to Cummings Creek, whose eponymous watershed measures 930 ha and outlets to Green’s Creek southeast of the intersection of Innes Road and Highway 417. The area south of the Highway within the study area is industrial and is generally surface drained in ditches and channels, eventually outletting to the Cyrville Drain. Some storm sewers in the south drain southward to the South Cyrville Drain. City staff have identified that there may be cross-connections in this industrial area south of the highway. Most of the industrial buildings have slab-on-grade foundations with no basements. Figure 4-7: Municipal Drains Near Cyrville Study Area rep_TOD_Servicing_131202_Final_Draft_Report.docx 4.9 LRT TRANSIT ORIENTED DEVELOPMENT STUDY AREAS SERVICING OVERVIEW Final Draft Report, December 2013 STORMWATER MANAGEMENT 4.1.6 Blair TOD Study Area This area covers about 118.7ha. The drainage area is split into three zones. Figure 4-8 presents the extents of the TOD area, and storm sewers in the region. Figure 4-8: Existing Storm Sewers, Blair TOD Study Area Firstly, the area north of Highway 174 and east of Blair Road discharges to the Ogilvie Road storm sewer which runs eastward to a culvert crossing at Jasmine Crescent.