Birch Avenue Municipal Class Environmental Assessment – Drainage and Stormwater Management Report · Retrofit · 2020-01-20
Each category awards a maximum percentage of the annual stormwater charge as credit. Evidence is extracted directly from the source PDF — no manual review.
| Storm event | Pre-dev (m3/s) | Post-dev (m3/s) | Δ |
|---|---|---|---|
| 2-yr | 4.57 | — | — |
| 5-yr | 5.38 | — | — |
| 10-yr | 5.42 | — | — |
| 25-yr | 5.48 | — | — |
| 50-yr | 5.51 | — | — |
| 100-yr | 5.52 | — | — |
Proposed underground infiltration chambers beneath 3 m wide multi-use path on west side of Birch Avenue near south underpass (Bridge 332). Infiltration rate ~10 mm/hour. Deemed infeasible due to Hydro One corridor constraints.
Proposed underground infiltration chambers beneath 3 m wide multi-use path on west side of Birch Avenue near north underpass (Bridge 330). Deemed infeasible due to Hydro One corridor constraints.
Wet pit pumping station proposed at south underpass. Required pump capacity: 0.28 m3/s (Option 1), 0.18 m3/s (Option 2), 0.026 m3/s (Option 3 – preferred). Station footprint 12m x 15m. Located in Birch Avenue Dog Park area (old landfill – geotechnical study required).
Wet pit pumping station proposed at north underpass, northwest quadrant of Birch Avenue and Burlington Street East. Required pump capacity: 0.78 m3/s (Option 1), 0.58 m3/s (Option 2), 0.043 m3/s (Option 3 – preferred). Station footprint 15m x 20m (Options 1 & 2) or 11m x 8m (Option 3).
How to read this page. Every value above was extracted from the source PDF by the PARCELFLOW report parser, which combines a layout-robust template detector with a validated extraction stage tuned to Ontario Functional Servicing and Stormwater Management reports. The four-category scorecard maps the parsed evidence onto Mississauga's credit bylaw. Numbers are estimates — engineering review still required before submitting a formal credit application to the City.