Appendix
Appendix A - Sewer Calculations
February 6, 2024Pages 175–1771 section
Detailed technical calculations for the proposed sanitary sewer flow for the 20-unit residential project.
20 proposed unitsEstimated sewage flow: 45,569 L/dayPeak flow: 0.53 L/s
Appendix A - Sewer Calculations
PEBBLES – PROPOSED SANITARY FLOW CALCULATIONS
Date: 2023/11/22 Prepared By: CK Project No: 33862
Inputs and Parameters
- 2.8 CAP/UNIT (CRD ENGINEERING SPECS – MEDIUM DENSITY)
- 240 L/CAP/DAY (MMCD – ADWF FOR METERED SYSTEM)
- 20 UNITS PROPOSED
- SITE AREA = 2470 m² = 0.247 ha
- i = 0.12 L/s/ha (MMCD – OLD SYSTEM ≥ 25 YRS)
Calculation Formula
QSEWAGE = CAPITA × ADDF × PEAKING FACTOR + I & I
Step-by-Step Calculations
1. Capita (P) CAPITA = 20 UNITS × 2.8 CAP/UNIT = 56 CAP = P
2. Peaking Factor (PF) PF = 3.2 / P0.105 = 3.2 / (1)0.105 = 3.2
3. Inflow and Infiltration (I & I) I & I = 0.247 ha × 0.12 L/s/ha = 0.03 L/s I & I = 2561 L/DAY
4. Total Sewage Flow (QSEWAGE) QSEWAGE = 56 × 240 × 3.2 + 2561 QSEWAGE = 45 569 L/DAY QSEWAGE = 0.53 L/s
Page 175–177
Extracted from: 2024 02 06 Council Agenda - Agenda - Pdf