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 74%
40%
✓Water Quality
TSS removal 88% (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 12-hr | 342 | 85 | −75% |
| 5-yr 12-hr | 458 | 118 | −74% |
| 10-yr 12-hr | 539 | 141 | −74% |
| 25-yr 12-hr | 642 | 170 | −74% |
| 50-yr 12-hr | 717 | 192 | −73% |
| 100-yr 12-hr | 792 | 214 | −73% |
Stormwater controls (9)
Underground storageBlock A Underground Cistern/Storage
Storage volume600.0 m³
Treatment volume46.0 m³
Outletorifice
Quantity control storage 600 m3; water balance/cistern storage 46 m3; 100-year release rate target 33 L/s; VO6 model release 57 L/s controlled to 33 L/s
Underground storageBlock E Underground Cistern/Storage
Storage volume755.0 m³
Treatment volume55.0 m³
Outletorifice
Quantity control storage 755 m3; water balance/cistern storage 55 m3; 100-year release rate target 34 L/s; VO6 model release 71 L/s
Underground storageBlock C Underground Cistern/Storage
Storage volume325.0 m³
Treatment volume25.0 m³
Outletorifice
Quantity control storage 325 m3; water balance/cistern storage 25 m3; 100-year release rate target 27 L/s; VO6 model release 35 L/s
Underground storageBlock F Underground Cistern/Storage
Storage volume785.0 m³
Treatment volume52.0 m³
Outletorifice
Quantity control storage 785 m3; water balance/cistern storage 52 m3; 100-year release rate target 19 L/s; VO6 model release 68 L/s
Underground storageBlock G Underground Cistern/Storage
Storage volume590.0 m³
Treatment volume52.0 m³
Outletorifice
Quantity control storage 590 m3; water balance/cistern storage 52 m3; 100-year release rate target 37 L/s; VO6 model release 60 L/s
Oil-grit separatorOGS at each block connection
OGS unit at connection of each block providing 50% TSS removal credit for roof, exposed parking areas and driveways
Green roofGreen Roof Systems
Allow for absorption, detention and evapotranspiration of stormwater; to be designed at site plan approval stage
Rainwater harvesting / reuseRainwater Harvesting Cisterns
Harvested rainfall stored in underground garage cisterns and used for irrigation purposes to achieve 5mm water balance target
BioretentionRain Gardens
Provide bioretention and filtration of stormwater prior to entering building plumbing or municipal sewer; to be designed at site plan approval stage
Best management practices (7)
Green Roof SystemsRain Gardens (Bioretention)Rainwater HarvestingUnderground Storage CisternsOil/Grit SeparatorsHydrovex unitsOrifice plates
Site characteristics & report metadata
Project1580-1590 & 1650 Dundas Street East Official Plan Amendment and Zoning Bylaw Amendment Applications
Project typeRedevelopment
DeveloperHazelview Investments
Existing land usemixed developed and undeveloped
Proposed land usemixed-use residential and retail
Site area7.39 ha
Water balance capture5.0 mm
TSS removal target88%
Allowable release rate466.9 L/s
Quality control methodtreatment train: green roof/landscaping (80% TSS credit), 5mm on-site retention/rainwater harvesting (50% TSS credit), oil-grit separator end-of-pipe (50% TSS credit)
Extraction audit
Confidence: high
Completeness: 83%
Source: 492-page PDF
Extractor: PARCELFLOW v1
Validation: passed
Source PDF: Functional-Servicing-and-Stormwater-Management-Report-November-2023-oz-opa-22-22-w1.pdf (492 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.