109 Garden Drive — Parsed SWM Report

Credit scorecard — Oakville 2026 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.

✓Enhanced SWM (≥80% TSS)

Provincial Enhanced — exceeds Oakville minimums

50%

—Normal SWM (≥70% TSS)

Provincial Normal — meets baseline — not documented

—Basic SWM (≥60% TSS)

Provincial Basic — meets minimum — not documented

Net credit

Up to 50% for non-residential with SWM exceeding minimum design standards

50%

Pre vs post peak discharge

Storm event	Pre-dev (m3/s)	Post-dev (m3/s)	Δ
5-yr	0.063	0.063	+0%
100-yr	0.063	0.063	+0%

Stormwater controls (4)

Underground storageCULTEC Recharger 360HD System

Storage volume51.5 m³

Outletorifice

4 rows x 28 units in two sections between Blocks 1 & 2 and 2 & 3 courtyards. Combined with underground storm sewer storage total volume is 80.42 m³. Required detention volume is 78.10 m³.

InfiltrationCultec Infiltration Gallery

Storage volume18.0 m³

Outletother

150 m² base area, 0.30 m depth below outlet, 40% porosity. Drawdown time calculated at 45.0 hrs. Hydraulic conductivity approx. 4.6E-04 for silty sand.

InfiltrationEcoLock Permeable Paving

Storage volume19.8 m³

Outletother

165 m² area, 0.30 m depth, 40% porosity. Bottom elevation 86.30, GWL 84.22. Drawdown time 45.0 hrs. Located in visitor parking area.

Oil-grit separatorHydroDome HD 6 (Hydroworks)

Outletpipe

Provides Level 1 TSS protection (83% annual TSS removal). Treats 100% of annual runoff. Peak flow 0.096 m³/s is less than full pipe flow of 0.29 m³/s. Headloss 273 mm above crown of 450 mm outlet pipe. Drainage area 0.4989 ha, imperviousness 72%, Toronto Central rainfall records.

Best management practices (6)

CULTEC Recharger 360HD underground storage systemHydroDome HD 6 oil/grit separatorCatchbasin shieldsEcoLock permeable pavingRoof downspout disconnection to landscape areasOrifice restrictor plate

Site characteristics & report metadata

ProjectProposed Mixed-Use Development at 109 Garden Drive

Project typeRedevelopment

DeveloperOakville Garden Residences Corp.

Existing land usevacant (formerly residential dwellings, demolished)

Proposed land usemixed-use (retail/commercial and townhouse residential)

Site area0.50 ha

Impervious40% (pre) → 72% (post)

Water balance capture25.0 mm

TSS removal target83%

Allowable release rate63.0 L/s

Quality control methodoil/grit separator (HydroDome HD 6) with catchbasin shields and permeable paving

Extraction audit

Confidence: high Completeness: 100% Source: 43-page PDF Extractor: PARCELFLOW v1 Validation: passed

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.