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 59%
40%
✓Water Quality
TSS removal 81% (enhanced)
30%
✓Runoff Volume
water balance retains 25 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 | 22 | 10 | −55% |
| 5-yr | 29 | 14 | −52% |
| 10-yr | 36 | 14 | −61% |
| 25-yr | 42 | 16 | −62% |
| 50-yr | 48 | 18 | −62% |
| 100-yr | 54 | 20 | −63% |
Stormwater controls (4)
Underground storageTriton S-29 Underground Stormwater Storage Chamber
Storage volume237.0 m³
Outletorifice
Vortex valve CEV 350 with 85 mm orifice; restricts flow to maximum 5 L/s; requires 226 m3 storage to achieve 5 L/s release rate
Oil-grit separatorStormceptor EFO4 (OGS)
62% TSS removal; downstream of underground stormwater storage chamber; part of treatment train achieving 81% TSS removal
SwaleProperty Line Swale with Subsurface Stone Gallery
Subsurface stone gallery with subdrain below swale; collects external drainage (0.11 ha); designed to retain and convey 100-year storm event to internal storm sewer; includes catchbasins at low points
InfiltrationEnhanced Topsoil
Storage volume49.0 m³
Outletother
Total topsoil depth of 450 mm (150 mm standard + 300 mm enhanced); provides 49 m3 storage for water balance; satisfies 100% of first 5 mm and 89% of 25 mm target
Best management practices (10)
Underground stormwater storage chamber (Triton S-29)Vortex valve (CEV 350 with 85 mm orifice)Oil-grit separator (Stormceptor EFO4)CB ShieldsProperty line swale with subsurface stone galleryEnhanced topsoilHeavy duty silt fencingRock mud matSediment control devices / storm drain inlet protectionEarthen berm
Site characteristics & report metadata
Project7170 Goreway Drive Residential Townhouse Development
Project typeSubdivision
Developer2150745 Ontario Inc.
Existing land usevacant
Proposed land useresidential townhouse
Site area0.41 ha
Water balance capture25.0 mm
TSS removal target81%
Allowable release rate5.0 L/s
Quality control methodoil-grit separator (Stormceptor EFO4) + CB Shields treatment train
Extraction audit
Confidence: high
Completeness: 92%
Source: 60-page PDF
Extractor: PARCELFLOW v1
Validation: passed
Source PDF: W5_7170_Functional-Servicing-and-Stormwater-Management-Report_May-2022.pdf (60 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.