APPENDIX D - ESTIMATED SANITARY FLOWS
Calculations for estimated residential sanitary flow for the proposed development at 167/169/171 Island Highway.
APPENDIX D
ESTIMATED SANITARY FLOWS
Estimated Sanitary Flow (Proposed - Residential)
Project: 167 / 169 / 171 Island Highway, View Royal, BC
Date: December 3, 2021
Client: GT Mann Contracting Ltd.
McElhanney File #: 21-060 (4)
Estimated Residential flow
| Description | Value |
|---|---|
| Total units* | 82 |
| TOTAL RESIDENTIAL UNITS | 82 |
| Persons per unit** | 2.24 Estimated |
| Equivalent Population | 184 capita |
| Per Capita Flow Rate*** | 240 L/capita/day |
| Average flow = | 44,160 L/day |
| Average Daily Flow | 44,160 L/day 0.511 L/s |
| Peaking Factor**** | 3.82 |
| Estimated Peak Flow = | 1.95 L/s |
| Site Area = | 3,804 sq.m. |
| Approx. Hard Surface building area = | 0 sq.m. |
| Approx. area for infiltration (allows for entire site infiltration) = | 3,804 |
| Inflow and Infiltration (0.12 L/s/ha)***** | 0.046 L/s |
| Total Estimated Flow = Estimated Peak Flow + Inflow and Infiltration | 2.00 L/s |
*based on information provided by Urban West Architecture Inc. dated December 2, 2021
**based on Ministry of Health Sewerage System Standard Practice Manual (Table II-9 - Per Capita Daily Design Flow for Residences) - see table below
***based on MMCD Design Guideline Manual 2014 (Section 3.2 Per Capita Flow, dry weather)
****based on MMCD Design Guideline Manual 2014 (Section 3.4 Peaking Factor)
*****based on MMCD Design Guideline Manual 2014 (Section 3.5 Infiltration - used old system requirement to provide factor of safety)
People per unit calculation:
| Description | Units | Cap/unit | Capita |
|---|---|---|---|
| Number of 4 bedroom units | 0 | 4.5 | 0 |
| Number of 3 bedroom units | 4 | 3.75 | 15 |
| Number of 2 bedroom units | 13 | 3 | 39 |
| Number of 1 bedroom units | 65 | 2 | 130 |
| Number of studio units | 1.25 | 0 | |
| TOTAL | 82 | 184 |
Therefore, Persons per unit = total capita/total units = 2.24