170 & 180 Columbia Street West — Parsed SWM Report

Credit scorecard — city 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.

—Peak Flow

discharge reduction — not documented

—Water Quality

TSS removal — not documented

—Runoff Volume

water-balance capture (2%/mm) — not documented

—Operations

combinable O&A sub-credits — not documented

Net credit

47%

Pre vs post peak discharge

Storm event	Pre-dev (L/s)	Post-dev (L/s)	Δ
2-yr	84.56	123.7	+46%
5-yr	113.54	171.86	+51%
25-yr	159.04	246.94	+55%
100-yr	206.41	324.53	+57%

Stormwater controls (4)

Underground storageCistern – East Lands (Phase 1 Building)

Storage volume138.0 m³

Required storage volume to meet 100-year peak flow control for East Lands; 42 m3 for 2-yr, 65 m3 for 5-yr, 102 m3 for 25-yr, 138 m3 for 100-yr

Underground storageCistern – West Lands (Phase 3 Building)

Storage volume58.0 m³

Required storage volume to meet 100-year peak flow control for West Lands; 16 m3 for 2-yr, 26 m3 for 5-yr, 42 m3 for 25-yr, 58 m3 for 100-yr

Green roofRoof Storage – Control Flow Roof Drains

Outletorifice

Zurn Z-105 Control-Flo drains at 0.38 L/s per 35 mm head; max ponding depth 0.15 m; storage area ~70% of rooftop

Oil-grit separatorOil Grit Separator (OGS)

To be positioned between the building and Columbia Street property line; provides 70% TSS removal for Normal Level of Protection

Best management practices (3)

Underground cistern storageControl flow roof drains (rooftop storage)Oil grit separator (OGS)

Site characteristics & report metadata

Project170 & 180 Columbia Street West Functional Servicing & Stormwater Management Report

Project typeRedevelopment

DeveloperIN8 Developments Inc.

Existing land usecommercial/industrial (gravel-covered area)

Proposed land usemixed-use residential and commercial

Site area1.60 ha

Impervious45% (pre) → 90% (post)

TSS removal target70%

Quality control methodOil grit separator and/or low impact development measures to achieve 70% TSS removal (Normal Level of Protection)

Extraction audit

Confidence: high Completeness: 96% Source: 53-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.