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
only some design storms documented
40%
✓Water Quality
TSS removal 81% (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 |
|---|
| 100-yr 12-hr | 0.279 | 0.241 | −14% |
| 100-yr 12-hr | 1.732 | 1.672 | −3% |
| 100-yr 12-hr | 1.524 | 1.487 | −2% |
Stormwater controls (8)
Underground storageUnderground Storage Tank - Block 1
Storage volume976.0 m³
Outletpipe
Area 152.5 m², depth 6.4 m; 5-year discharge 0.0183 m3/s, 100-year discharge 0.061 m3/s; pumped to 300 mm pipe connecting to Viola Desmond Drive superpipe
Underground storageUnderground Storage Tank - Block 2
Storage volume1,120.0 m³
Outletpipe
Area 175 m², depth 6.4 m; 5-year discharge 0.021 m3/s, 100-year discharge 0.07 m3/s; pumped to 300 mm pipe connecting to superpipe
Underground storageUnderground Storage Tank - Block 3
Storage volume824.0 m³
Outletpipe
Area 128.75 m², depth 6.4 m; 5-year discharge 0.01545 m3/s, 100-year discharge 0.0515 m3/s; pumped to 300 mm pipe connecting to superpipe
Underground storageSuperpipe Storage - Public ROW
Storage volume334.9 m³
Outletorifice
1.2 m diameter superpipe with 300 mm orifice; total volume 334.9 m3 across four pipe segments; SWS required 442 m3 but PCSWMM confirms 100-year release target is met
Oil-grit separatorStormceptor STC-750 (MH 10/MH 11)
Stormceptor STC-750 or equivalent; provides 81% TSS removal against 80% target; treating approximately 4.95 ha; fine PSD; rainfall station Toronto Pearson AP
Green roofGreen Roof (considered)
Green roofs considered for water balance retention; precipitation retained in soil with opportunity for evapotranspiration; not confirmed as implemented
InfiltrationLandscaped Area Retention / LID Filtration
City requires first 5 mm retention; 248 m3 target for 4.95 ha site; infiltration not feasible under most of site due to underground parking; filtration via LIDs where possible
SwaleEmergency Overland Flow Swale
Emergency overland flow swale @ 2.33% shown on grading plan C-201
Best management practices (7)
Underground storage tanksSuperpipe storageOil-grit separator (Stormceptor STC-750)Green roof (considered)LID filtrationInfiltration in landscaped areasEmergency overland flow swale
Site characteristics & report metadata
Project5080, 5054 & 5034 Ninth Line Draft Plan of Subdivision
Project typeSubdivision
DeveloperYour Home Developments
Existing land useagricultural and residential
Proposed land usemid-rise residential (apartments and townhouses)
Site area4.95 ha
Impervious10% (pre) → 84% (post)
Water balance capture5.0 mm
TSS removal target81%
Quality control methodoil-grit separator (Stormceptor STC-750) targeting 80% TSS removal; Enhanced level of treatment required
Extraction audit
Confidence: high
Completeness: 100%
Source: 54-page PDF
Extractor: PARCELFLOW v1
Validation: passed
Source PDF: W10_5034_5054_5080_Functional_Servicing_and_Stormwater_Management_Report_Dec2021.pdf (54 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.