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Sewage Calculations for 298 Island Highway
September 15, 2020Pages 786–7871 section
Handwritten engineering calculations for Peak Wet Weather Flow (PWWF) and average daily wastewater generation.
August 24, 202032,435 L/day total daily flow0.375 L/s peak daily flow
298 Island
Sewage Calculations
Proposed Building
Assumptions
- 300 L/c/d (MMCD)
- 1.8 cap/unit (CRD - for High density)
- 5 L/m² for retail/commercial (VIHA)
- Rest as per MMCD design guidelines.
Given
- 54 units.
- 655 m² retail/commercial.
Calc's
ADWF
- 54 units x 1.8 cap/unit x 300 L/cap/day = 29,160 L/day
- 655 m² x 5 L/m² = 3,275 L/day
- Total: 32,435 L/day
- => 0.375 L/s
Calc Peaking Factor
- Pop equivalent = (32,435 L/day) / (300 L/cap/day) = 108 cap.
PF (Peaking Factor)
- PF = 6.75 P⁻⁰·¹¹ = 6.75 (108)⁻⁰·¹¹
- PF = 4.032
PWWF (Peak Wet Weather Flow)
- * Assume no I/I since building take whole site.
- ∴ = 4.032 (0.375 L/s) = 1.512 L/s
Page 786–787
Extracted from: 2020 09 15 Committee of the Whole Agenda - Agenda - Pdf