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
discharge reduction — not documented
0%
✓Water Quality
TSS removal 89% (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 | 0.256 | 0.702 | +174% |
| 5-yr | 0.435 | 1.001 | +130% |
| 100-yr | 1.07 | 2.015 | +88% |
| Regional | 0.817 | 0.894 | +9% |
Stormwater controls (4)
Underground storageSWM Underground Storage Tank
Storage volume985.0 m³
Treatment volume140.0 m³
Outletorifice
Outlet invert191.29 m
100-yr HGL193.35 m
675mm diameter outlet pipe; maximum allowable orifice release rate 1.867 m3/s; 100-year required release rate 1.070 m3/s; located in southeastern portion of development (Block 127). OGS used as pretreatment upstream of tank. Treatment train: OGS (50% TSS) + SWM Tank (65% TSS) = 82.5% effective TSS removal.
Oil-grit separatorOGS
1 proposed OGS unit upstream of SWM Tank; TSS removal = 50%; combined with SWM Tank in treatment train approach per New Jersey Stormwater BMP Manual Equation 4-1.
InfiltrationFront-yard Soakaway Pits
Storage volume68.0 m³
Treatment volume68.0 m³
Surface area0.250 ha
Outletoverflow
27mm capture from roof areas on front lots (0.25 ha); overflow pipe connected to municipal storm sewer in ROW. Provided volume per lot = 5.19 m3.
SwaleRear-yard Infiltration Trenches / Swales
Rear roof leaders disconnected; roof flows drain overland to rear yard swales with infiltration trenches beneath. Provides increased opportunity for infiltration.
Best management practices (5)
Underground Storage TankOil-Grit Separator (OGS)Front-yard Soakaway PitsRear-yard Infiltration TrenchesRear-yard Swales
Site characteristics & report metadata
ProjectLisgar Drive - Avenia Construction Inc.
Project typeSubdivision
DeveloperAvenia Construction Inc.
Existing land usevacant/undeveloped
Proposed land useresidential subdivision
Site area6.66 ha
Water balance capture5.0 mm
TSS removal target89%
Quality control methodoil-grit separator (OGS) pretreatment + underground SWM storage tank (treatment train); soakaway pits with infiltration media for east drainage area
Extraction audit
Confidence: high
Completeness: 92%
Source: 56-page PDF
Extractor: PARCELFLOW v1
Validation: passed
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.