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 55%
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
combinable O&A sub-credits — not documented
0%
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 | 16.21 | 11.72 | −28% |
| 5-yr | 21.8 | 11.72 | −46% |
| 10-yr | 26.85 | 11.72 | −56% |
| 25-yr | 30.83 | 11.72 | −62% |
| 50-yr | 34.42 | 11.72 | −66% |
| 100-yr | 38.09 | 11.72 | −69% |
Stormwater controls (5)
Underground storageConcrete Storm Tank / Cistern (OC1)
Storage volume170.0 m³
Treatment volume14.5 m³
Outletother
Concrete cistern at underground parking level P1. Outlet controlled by Contech Vortex Valve Model FA1416 at overcontrolled flow rate of 11.72 L/s. Tank drawdown time for 100-year storm is 5.67 hours. Also retains 15.40 m3 for 5mm water balance requirement.
Green roofExtensive Green Roof
466 m2 green roof. Reduces runoff but does not provide retention capacity beyond first 5mm of each storm event. TSS removal efficiency 80%.
BioretentionBio-retention Swale
500mm of 50mm washed clear stone below bio-retention area provides approximately 1.2 m3 of retention volume.
Oil-grit separatorJellyfish StormFilter SFPD0806
Installed at inlet of storage tank at southeast corner of site. Treats flow from driveway and surface parking areas (1312 m2). Achieves 80% TSS removal efficiency for those areas. Located outside underground parking footprint.
Rainwater harvesting / reuseIrrigation Reuse
Average 72-hour irrigation water use is 14.49 m3. Yearly irrigation demand 709.72 m3/year. Retained water pumped to appropriate locations for irrigation.
Best management practices (9)
Underground concrete storage tank/cisternExtensive green roof (466 m2)Bio-retention swaleRainwater harvesting / irrigation reuseJellyfish StormFilter SFPD0806Contech Vortex Valve Model FA1416Siltation control fenceSediment control at catch basinsGranular mud-mats at construction egress
Site characteristics & report metadata
Project3016-3032 Kirwin Ave & 3031 Little John Lane Residential Development
Project typeRedevelopment
DeveloperDVB Real Estate Investments Inc.
Existing land useresidential houses
Proposed land usemulti-storey residential apartment
Site area0.64 ha
Impervious57% (pre) → 77% (post)
Water balance capture5.0 mm
TSS removal target80%
Allowable release rate11.7 L/s
Quality control methodJellyfish StormFilter SFPD0806 (or approved equivalent) for driveway and surface parking areas; green roof and landscape areas provide 80% TSS removal; composite TSS removal >80% for sub-catchment OC1
Extraction audit
Confidence: high
Completeness: 100%
Source: 258-page PDF
Extractor: PARCELFLOW v1
Validation: passed
Source PDF: OPA-OZ-21-005-W7-Functional-Servicing-and-Stormwater-Management-Report-March-2024.pdf (258 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.