Thorny Brae Townhouse Development · New · 2025-10-16
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 |
|---|---|---|---|
| 10-yr | — | 0.347 | — |
Installed at outlet of internal storm system. Drainage area 1.526 ha, imperviousness 69%. Provides 80% annual TSS removal based on Toronto Central rainfall. Headloss calculated using full pipe flow of 0.61 m3/s for 525mm pipe at 2% slope; headloss 494mm above crown of 525mm outlet pipe.
CB shields installed in all catch basins and double catch basins. Combined with OGS to form treatment train providing 80% TSS removal. CB Shield TSS removal = 60%, OGS TSS removal = 50%.
Three GreenStorm Stormwater Crates collecting roof runoff from Blocks 3,4,7,8,9 & 10. Tank area 84.5 m2, depth 660mm, porosity 97%. Infiltration rate 15 mm/hr assumed for native soils. Infiltration time 44 hours. Required volume 53.0 m3, available volume 54.1 m3.
Rooftop rainwater leaders of rear-draining building areas directed to rear yard infiltration facilities as LID measure.
300mm deep topsoil layer implemented to reduce surface runoff and promote infiltration as LID measure.
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.