Identifying Actions
A series of flood scenarios were developed for the CCCAP and the plan recommends a series of actions to address each identified priority area, including Lorne Street. Mount Allison University conducted a community vulnerability assessment for Sackville and hosted several workshops with the public to identify areas of risk and vulnerability to flooding. The CCCAP identified the following actions to be undertaken by 2021 to mitigate flooding and increase resilience in the Lorne Street area: 1) Undertake a hyrdo-technical study of the watershed to assess adaptation options; 2) Undertake Lorne Street infrastructure upgrades; 3) Create an integrated, community-wide approach to stormwater management; 4) Construct stormwater retention ponds of adequate size to accept increased precipitation. Additional engineering studies were undertaken, and the sizing of the stormwater retention ponds was based on a PCSWMM stormwater model, in which various inputs were used to appropriately size the ponds. The new ponds were sized based on a 1 in 100 year return period, 24 hour design storm, and consideration was given to tidal impacts which further limit the ability of water to drain from the site. During a rainfall event, the new ponds were designed to retain the water during the high tide and allow the water to discharge during the ±six (6)-hour window when the tides are low enough to allow drainage from the site. The complete stormwater management strategy for the Lorne Street (Phase III) area includes requirements for additional storage volume, to reduce peak flows and provide runoff storage when tide levels are high. This will be accomplished through the provision of two stormwater management control areas.