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 21%
40%
✓Water Quality
TSS removal 85% (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 (m3/s) | Post-dev (m3/s) | Δ |
|---|
| 2-yr | 0.028 | 0.011 | −61% |
| 5-yr | 0.018 | 0.016 | −11% |
| 10-yr | 0.022 | 0.02 | −9% |
| 25-yr | 0.03 | 0.024 | −20% |
| 50-yr | 0.034 | 0.026 | −24% |
| 100-yr | 0.028 | 0.028 | +0% |
Stormwater controls (4)
Underground storageSWM Tank 1
Storage volume260.0 m³
Treatment volume260.0 m³
Surface area0.013 ha
Outletorifice
Outlet invert141.95 m
Active storage provided 260.0 m³, active storage required 259.0 m³. Area of tank = 130 m², height = 2.00 m. Bottom of tank = 141.95 m, top of tank = 143.95 m. Located on south-west corner of site. Outlet via 75mm PVC orifice tube.
Oil-grit separatorOGS3 (Stormceptor EF4)
Stormceptor EF4 model. Drainage area 0.547 ha. TSS removal efficiency 85%. Located upstream of SWM tank. 1500 mm diameter manhole (OPSD 701.011).
InfiltrationInfiltration Gallery 1
Storage volume76.0 m³
Treatment volume27.0 m³
Surface area0.010 ha
Outletother
Outlet invert141.35 m
Area = 100 m², height = 1.9 m, top = 143.25 m, bottom = 141.35 m. GWL = ±132 m (approx. 9 m separation from bottom). Void ratio = 40%. Storage required = 27 m³, total storage = 76 m³. Located below surface parking south of new building. Provides first 5 mm water balance retention.
SwaleSwales (multiple)
Multiple swales shown on grading and drainage plans, e.g. 42.6 m swale @ 3.20%, 14.8 m swale @ 8.02%, 10.7 m swale @ 2.00%, 8.9 m swale @ 2.00%, 2.1 m swale @ 2.00%, 1.82 m swale @ 2.00%.
Best management practices (7)
Oil-Grit Separator (Stormceptor EF4)Underground SWM Storage TankInfiltration GallerySwalesSediment Control FenceConstruction Access Stone PadSilt Protection Sack
Site characteristics & report metadata
Project1315 Silver Spear Road
Project typeRedevelopment
DeveloperStarlight Group Property Holdings Inc.
Existing land useresidential (8-storey apartment building and surface parking)
Proposed land useresidential (14-storey apartment building with underground parking added to existing 8-storey building)
Site area0.55 ha
Water balance capture5.0 mm
TSS removal target85%
Allowable release rate28.0 L/s
Quality control methodoil-grit separator (Stormceptor EF4) upstream of underground SWM storage tank
Extraction audit
Confidence: high
Completeness: 92%
Source: 57-page PDF
Extractor: PARCELFLOW v1
Validation: passed
Source PDF: Functional-Servicing-And-Stormwater-Management-Report-OZ-OPA-18-005-April-2025.pdf (57 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.