Proposed flood mitigation investments: 2022 – 2024
In a recent regulatory filing, we proposed investments of $240 million to implement citywide flood mitigation measures in Edmonton during 2022 – 2024. The largest investments are in the construction of new dry ponds that protect property by capturing and holding stormwater, and the low impact development program which uses green infrastructure to slow the entry of stormwater into the drainage system, preserving pipe capacity during storm events and improving the quality of stormwater flowing to the river.
Investments in dry ponds are expected to be $93 million, net of grants received from government. About one third is for the completion of infrastructure related to the Malcolm Tweddle and Edith Rogers dry ponds. At any one time, we expect to have six dry pond projects active — two in early planning, two in design and two in construction.
Low impact development work includes installation of green infrastructure at 18 commercial and industrial sites, and at eight additional sites that align with City of Edmonton projects. This investment of $53million will capture, absorb and filter stormwater before it reaches the sewer system.
Preserving capacity in the stormwater system during rain events helps reduce the risk of flooding and sewer backups. Nearly $42 million will be invested to reline 60 km of sanitary and combined sewer pipes, and seal and reline 3,000 manholes.
Award winning plan