The storm drainage system helps prevent flooding by diverting rain and snowmelt into the nearest river or creek through curbside drains and underground pipes. The system also includes retention ponds to hold excess water during heavy rainstorms.
After the June 2013 Flood, The City of Calgary inspected the Bow and Elbow Rivers and Fish, Nose and West Nose Creeks for significant damages to outfalls and riverbanks. We identified 161 outfalls on the Rivers and 53 outfalls on the Creeks with damage and have prioritized them for repairs. Stormwater is rain or snow melt from our roofs, lawns and roadways that enters the storm drains on our streets and travels through an underground pipe system eventually draining into our rivers. The site where the stormwater flows from the pipes and into the river/creek is called an outfall.
Construction work for the outfall repairs includes:
- Demolition of portions of existing outfalls.
- Providing care of water, turbidity, barriers and erosion and sediment control measures.
- Excavation including shoring.
- Fill placement.
- Proving manholes, pipes, metalworks and miscellaneous items.
- Constructing a cast in-place inlet extension.
- Providing bedding gravel, riprap and stone blocks.
- All related work to complete the project.
As a part of our flood recovery work, we are working on the following projects:
- B100 - located on the north bank of the Bow River, near the south east corner of Bowcrest Park.
- N2B – located on the right bank of Nose, N.W. of intersection of Deerfoot Trail and Memorial Drive.
- N12 – located on the left bank of Nose Creek and on the Fox Hollow Golf Course near tee box of 14th hole.
- N14 – located on the left bank of Nose Creek and on the Fox Hollow Golf Course south of the clubhouse.
- N15 – located on the right bank of Nose Creek, near the start of the 18th fairway at the Calgary Elk’s Golf Course.
- N18 – located on the right bank of Nose Creek, east of the 32 Ave. and 6 St. N.E. intersection.
- N23 – located on the right bank of Nose Creek, southeast of the 32 Ave. N.E. and Edmonton Trail N.E. interchange.
- N33A – located on the right bank of Nose Creek, 350m northwest of the Deerfoot Trail and 64 Avenue N.E. interchange.
- B5A and B5B – located on the left bank of the Bow River, south of the Bonnybrook Bridge.
- B69 – located on the right bank of the Bow River near Pumphouse Theatre and Bow River pathway.
- B56A – located on the right bank of the Bow, downstream of the 10th Street Bridge (across from old Science Centre).
- E25A – located on the left bank of the Elbow River, between Talisman and 25 St. Bridge.
- E30 – right bank of the Elbow River.
- E65 – located on the right bank of the Elbow River, just downstream of the Glenmore Reservoir.
- G20C – is located upstream of the Glenmore Reservoir within Tsuu T'ina land.
Completed outfall projects
- B107 – located on the right bank of the Bow River at Bow Crescent N.W. and 66 St. N.W.
- B121 – located on the Eaglequest Douglasdale Golf Course, 60m northwest of the first tee box.
Storm drainage system recovery and resiliency projects - completed
4 Street stormwater lift station
As part of our effort to manage Calgary's stormwater drainage, we upgraded the stormwater lift station located at 450 10 Avenue S.E.
Stormwater lift stations are used to manage stormwater by pumping water away from low-lying areas. During the 2013 flood, the electrical components inside the stormwater lift station were damaged.
Upgrades to the lift station involved raising all electrical components including the backup generator above the 1:100 year flood level to increase resiliency of the station during heavy rainfall events.