Credit scorecard — Mississauga 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
pre-vs-post controlled across multiple storms; avg reduction 19%
40%
✓Water Quality
TSS removal 80% (enhanced)
30%
✓Runoff Volume
water balance retains 5 mm on site (2% per mm, max 30% at 15 mm)
30%
✓Operations
BMPs + P.Eng present; sub-credit detection pending — full 20% requires explicit O&A items
20%
Net credit
Capped at 50% of annual stormwater charge
50%
Pre vs post peak discharge
| Storm event | Pre-dev (L/s) | Post-dev (L/s) | Δ |
|---|
| 2-yr | 219.5 | 192.6 | −12% |
| 5-yr | 295.1 | 236.7 | −20% |
| 10-yr | 363.5 | 273 | −25% |
| 25-yr | 417.5 | 319.4 | −23% |
| 50-yr | 466 | 364 | −22% |
| 100-yr | 515.7 | 399.7 | −22% |
| Regional Storm (Hurricane Hazel) | 375 | 340 | −9% |
Stormwater controls (4)
Underground storageSWM Management Tank (P1 level)
Storage volume793.3 m³
Treatment volume98.6 m³
Surface area0.028 ha
Outletorifice
Outlet invert151.11 m
281.8 m2 footprint; 300 mm orifice tube; max HGL depth 2.15 m for 100-yr; 0.6 m deep sump with 0.35 m retention zone for water balance reuse
Oil-grit separatorStormFilter SF0824 (also referenced as SF0825 on drawing)
Outletpipe
Outlet invert150.20 m
Contech Engineered Solutions StormFilter unit; inlet invert 151.11 m; outlet invert 150.20 m; provides 80% TSS removal; downstream of SWM tank
Rainwater harvesting / reuseWater Balance Reuse via Irrigation/Mechanical
Storage volume88.2 m³
Outletother
5 mm retention requirement; 132 m3 total retention required; 43.8 m3 via initial abstraction; 88.2 m3 reused via irrigation/mechanical within 72 hrs; 98.6 m3 total retention provided
SwaleCut-off Swale (south/east property limit)
Existing swale conveying external drainage from townhouses to south; to be maintained in post-development condition along southern property limit
Best management practices (7)
Underground detention storage tankStormFilter cartridge filter unit (SF0824/SF0825)Rainwater reuse via irrigation and mechanical systemsGreen roof (proposed area = 0, but referenced in water balance table)Landscape/permeable surfaces for initial abstractionOil-grit separator (referenced in drawing legend)Swale (existing, maintained post-development)
Site characteristics & report metadata
Project4099 Erin Mills Parkway Functional Servicing and Stormwater Management Report
Project typeRedevelopment
DeveloperQueenscorp (Erin Mills) Group
Existing land usecommercial/retail plaza with asphalt parking lot
Proposed land usemixed residential (mid-rise and high-rise apartments, stacked townhouses) with ground-floor retail
Site area2.64 ha
Water balance capture5.0 mm
TSS removal target80%
Allowable release rate515.7 L/s
Quality control methodStormFilter cartridge filter unit (SF0824) providing 80% TSS removal; roof and landscaped areas considered inherently clean
Extraction audit
Confidence: high
Completeness: 83%
Source: 81-page PDF
Extractor: PARCELFLOW v1
Validation: passed
Source PDF: functional-servicing-stormwater-management-report-november-2024-oz-opa-22-25-w8.pdf (81 pages)
Open source PDF →
Starter package
Download credit application package »
10-page PDF: pre-filled Form 2703, starter P.Eng report skeleton, submission checklist. Engineer reviews, adds site inspection + O&M plan, certifies + submits.
Download PDF »
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.