491 Springbrook Avenue & 851 Garner Road East — Parsed SWM Report

Credit scorecard — Hamilton bylaw

Each category awards a maximum percentage of the annual stormwater charge as credit. Evidence is extracted directly from the source PDF — no manual review.

✓On-site controls

documented source control on the site

50%

—Lake Ontario green-space bonus

direct discharge + green-space parcel flag (90% tier) — not documented

Net credit

50% baseline; up to 90% with Lake Ontario direct-discharge + green-space flag

50%

Pre vs post peak discharge

Storm event	Pre-dev (m3/s)	Post-dev (m3/s)	Δ
2-yr 24-hr	0.261	0.066	−75%
5-yr 24-hr	0.449	0.178	−60%
10-yr 24-hr	0.582	0.271	−53%
25-yr 24-hr	0.773	0.412	−47%
50-yr 24-hr	0.917	0.516	−44%
100-yr 24-hr	1.064	0.615	−42%

Stormwater controls (3)

Wet detention pondSWM Wet Pond

Storage volume7,651.0 m³

Treatment volume932.0 m³

Outletorifice

Outlet invert242.50 m

100-yr HGL243.78 m

Two-outlet system: Outlet No. 1 is 110mm diameter circular orifice at invert 242.50m for extended detention (erosion control); Outlet No. 2 is 675mm diameter orifice pipe at invert 242.95m for quantity control. Permanent pool volume = 1898 m3 (provided 1800 m3 per quality table). Extended detention volume provided = 932 m3. Clay liner (500mm thick) recommended. Bottom of pond at 240.80m. 29-hour drawdown time for extended detention.

Oil-grit separatorHydroStorm Oil/Grit Unit HW1 (West Inlet)

Outletother

HydroStorm HS-5 unit serving catchments 200 & 201 (0.996 ha, 78% imp). Provides 72% TSS removal. Used as forebay replacement.

Oil-grit separatorHydroStorm Oil/Grit Unit HW2 (East Inlet)

Outletother

HydroStorm HS-10 unit serving catchments 100 + 301 + 400A,B,C + 401A,B,C,D + 501 (4.211 ha, 71.5% imp). Provides 75% TSS removal. Used as forebay replacement.

Best management practices (6)

Wet pond SWM facilityOil/grit separator (HydroStorm HS-5)Oil/grit separator (HydroStorm HS-10)Clay linerLow Impact Development (LID) measures (enhanced swales, rain gardens, rooftop infiltration – to be confirmed at Site Plan stage)Sediment and erosion control

Site characteristics & report metadata

ProjectSpringbrook Meadows West Development – 491 Springbrook Avenue & 851 Garner Road East

Project typeSubdivision

DeveloperSpringbrook Meadows West Developments Inc. and 2299453 Ontario Inc.

Existing land usevacant

Proposed land usetownhouse residential

Site area6.68 ha

Impervious0% (pre) → 62% (post)

Water balance capture25.0 mm

TSS removal target80%

Quality control methodwet pond (enhanced 80% TSS removal) with oil/grit separator pre-treatment in lieu of forebays

Extraction audit

Confidence: high Completeness: 100% Source: 129-page PDF Extractor: PARCELFLOW v1 Validation: passed

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.