After a torrential rainstorm in August 2011 caused flooding in parts of Casa Loma, the City of West Kelowna began the process of consulting with residents and working with engineers to design and build effective, proven drainage control solutions for the neighbourhood.
Background - Phase 2
On October 8, 2013, Council awarded a contract, in the amount of $685,848, to Colmar Construction Ltd. to install Casa Loma Drainage Improvements Phase 2:
Feedback from the open house was presented at the August 27, 2013 Council meeting, and, based on favourable community input, Council directed staff to proceed with Phase 2 improvements.
City of West Kelowna has also previously hosted a public meeting with Casa Loma residents on April 30, 2013 to discuss Phase 2 of the Casa Loma Drainage Project. Following that meeting, Council directed that the Casa Loma project be deferred pending receipt of a petition of support from the majority of Casa Loma residents in the affected area by June 30, 2013.
On January 15, 2013 Council had given early budget approval to the project to allow staff to begin planning and design.
Background - Phase 1
From October through December 2012, Phase 1 construction was completed on several drainage mitigation measures designed to effectively control significant water flows. Phase 1 drainage measures included:
Digging ditches of various depths along the public road right of way
Dressing the ditches with top soil, rip rap and turf in varying degrees and sections to control the flow of water and create a more natural esthetic
The ditches were required due to:
The road height in relation to the lower shoulders
The high volumes of water that could overwhelm pipes and catch basins during severe torrential rain storms in the Okanagan
The high cost of installing curbs, gutters and underground infrastructure
Rationale for Drainage Works
An August 10, 2011 torrential rainstorm storm caused generalized flooding in Casa Loma and Lakeview Heights. In
some neighbourhoods the runoff flooded properties and/or homes, and
considerable pond-like accumulations of water occurred in low lying areas. The event
lead to a review of Casa Loma's existing drainage system, which had been
installed many years prior to City of West Kelowna incorporation on
December 6, 2007.
Below are links to initial staff reports
and a report from the City's consultant, RSB Engineering, regarding
Casa Loma drainage:
careful review of the storm drainage system that existed in the Casa
Loma area at the time, the City of West Kelowna determined that ditches
would be required in strategic locations within the neighbourhood, in
order to adequately control storm water in the event of torrential
sizes of the ditches to be constructed would be reflective of the
significant volumes of water that would need to be handled during severe
storms. Installing curbs, gutters and underground pipes would have been
significantly more costly than the chosen plan, and could still not
have entirely handled heavy water flows during severe torrential rain
chose the most cost-effective method due to the City of West Kelowna's
need to remain fiscally accountable to all taxpayers in the
municipality, maintain a balanced budget and strategically prioritize a
high number of infrastructure needs throughout its jurisdiction.
the existing drainage system was assessed and the appropriate
mitigation measures were identified, the City of West Kelowna held
public input sessions and consulted with residents and property owners
through a series of community meetings and correspondence before
proceeding through to the identified stages of construction.