Appendix B: Sanitary Sewer Calculations

April 25, 2017Pages 232–2383 sections

Technical calculations for existing and proposed residential sanitary flows and pipe capacities.

1. CALL TO ORDER

Land size: 15.8 acreProposed total potential flow: 10.43 L/sEquivalent population (proposed): 1,064 capita

Appendix B

Sanitary Sewer Calculations

Page 232–238

CHRISTIE POINT

2818-3037 Craigowan Road, Victoria, BC

SALIENT DATA

Description	9 buildings 4 townhouse blocks, 5 apartment buildings Concrete foundations and wood frame construction
Building Amenities	240 surface parking stalls Laundry rooms for apartment, hook-ups in TH Outdoor pool, canoe rack, community room
Mechanical Systems	Natural gas fired boilers for apartment Radiant baseboard heaters for apartment Partial sprinklers in apartment boiler rooms
Year of Construction	1963
Land size	15.8 acre (688,248 SF)
Unit Mix
103	2-bedroom (840 SF)
10	3-bedroom (1,020 SF)
48	3-bedroom townhouse (1,135 SF)
161	TOTAL
Services provided in Rent	Heat, water

Interior view of a renovated kitchen with white cabinetry and appliances

CHRISTIE POINT DATA - NOV. 29, 2016

BLDG A	L1	L2	L3	L4	L5	L6	TOTAL
# UNITS	16	14	14	14	10	8	76
BUILDING AREA	21200	24000	22300	22300	17350	11750	118,900
LEASABLE UNIT AREA	17,650	17,750	16,500	16,500	12,300	8,100	88,800
AVG UNIT SIZE (s.f.)	1,103	1,268	1,179	1,179	1,230	1,013	1,168

BLDG B	L1	L2	L3	L4	L5	L6	TOTAL
# UNITS	11	11	11	10	9	9	61
BUILDING AREA	16,100	18,700	18,700	16,800	15,300	12,150	97,750
LEASABLE UNIT AREA	12,600	14,000	14,000	12,350	11,100	8,950	73,000
AVG UNIT SIZE (s.f.)	1,145	1,273	1,273	1,235	1,233	994	1,197

BLDG C	L1	L2	L3	L4	L5	L6	TOTAL
# UNITS	10	10	10	10	10	10	60
BUILDING AREA	16,500	18,400	15,700	15,700	15,700	13,800	95,800
LEASABLE UNIT AREA	9,700	11,200	11,200	11,200	11,200	10,000	64,500
AVG UNIT SIZE (s.f.)	970	1,120	1,120	1,120	1,120	1,000	1,075

BLDG D1	L1	L2	L3	L4	L5	L6	TOTAL
# UNITS	12	12	12	11	10	7	64
BUILDING AREA	18,000	19,350	19,350	17,300	16100	12,900	103,000
LEASABLE UNIT AREA	13,900	13,900	13,900	12,000	11,000	9,400	74,100
AVG UNIT SIZE (s.f.)	1,158	1,158	1,158	1,091	1,100	1,343	1,158

BLDG D2	L1	L2	L3	L4	L5	L6	TOTAL
# UNITS	12	12	12	11	10	7	64
BUILDING AREA	18,000	19,350	19,350	17,300	16100	12,900	103,000
LEASABLE UNIT AREA	13,900	13,900	13,900	12,000	11,000	9,400	74,100
AVG UNIT SIZE (s.f.)	1,158	1,158	1,158	1,091	1,100	1,343	1,158

BLDG E	L1	L2	L3	L4	L5	L6	TOTAL
# UNITS	10	10	10	10	10	10	60
BUILDING AREA	16,500	18,400	15,700	15,700	15,700	13,800	95,800
LEASABLE UNIT AREA	9,700	11,200	11,200	11,200	11,200	10,000	64,500
AVG UNIT SIZE (s.f.)	970	1,120	1,120	1,120	1,120	1,000	1,075

BLDG F	L1	L2	L3	L4	TOTAL
# UNITS	13	13	13	11	50
BUILDING AREA	20,000	20,000	20,000	15,600	75,600
LEASABLE UNIT AREA	14,900	14,900	14,900	12,000	56,700
AVG UNIT SIZE (s.f.)	1,146	1,146	1,146	1,091	1,134

BLDG G	L1	L2	L3	L4	TOTAL
# UNITS	10	10	10	8	38
BUILDING AREA	14,500	14,500	14,500	12,400	55,900
LEASABLE UNIT AREA	9,900	9,900	9,900	8,800	38,500
AVG UNIT SIZE (s.f.)	990	990	990	1,100	1,013

Summary Metric	Value
TOTAL # UNITS	473
TOTAL APPROX. LEASABLE AREA (s.f.)	534,200
APPROX BUILDING AREA (EXCLUDES PARKING) (s.f.)	745,750
OVERALL AVG UNIT SIZE (s.f.)	1,129
LAND AREA (Surveyed Dec. 2015) (s.f.)	678,665
APPROX. FSR (EXCLUDES PARKING)	1.10

EXISTING - Estimated Residential Sanitary Flows

Project: Christie Point Redevelopment Date: September 13, 2016 Client: Realstar Management Partnership McElhanney File No.: 16-057 (4)

Parameter	MMCD Equation***	Saanich Equation**
Total Units (estimated at this time) =	161
TOTAL RESIDENTIAL UNITS =	161
Persons per unit** =	2.25 Estimated
Equivalent Population =	362 capita
Per Capita Flow Rate*** =	240 L/capita/day	360 L/capita/day
Average Flow =	87,000 L/day	130,500 L/day
Average Daily Flow, ADD =	87,000 L/day 1.01 L/s	130,500 L/day 1.51 L/s
Peaking Factor, PF (P = Population in Thousands)	PF = 3.2 / P^0.105 3.56 Using MMCD PF	PF = 1 + 14 / (4 + P^0.5) 4.04 Using Harmon PF
Potential Peak Flow, ADD x PF =	3.58 L/s	6.11 L/s
Site Area* =	172,125 sq.m.
Approx. area for infiltration* =	17.21 ha
Inflow and Infiltration*** (0.061 L/s/ha)	0.06 L/s/ha 1.0 L/s	0.13 L/s/ha 2.2 L/s
Total Potential Flow = Potential Peak Flow + Inflow and Infiltration	4.62 L/s	8.34 L/s

*based on legal survey from J.E. Anderson & Associates (one quarter of total site area) **based on District of Saanich's Schedule H to Bylaw 7452 (2004) guidelines ***based on MMCD Design Guideline Manual 2014

PROPOSED - Estimated Residential Sanitary Flows

Project: Christie Point Redevelopment Date: December 1, 2016 Client: Realstar Management Partnership McElhanney File No.: 16-057 (4)

Parameter	MMCD Equation***	Saanich Equation**
Total Units (estimated at this time) =	473
TOTAL RESIDENTIAL UNITS =	473
Persons per unit** =	2.25 Estimated
Equivalent Population =	1,064 capita
Per Capita Flow Rate*** =	240 L/capita/day	360 L/capita/day
Average Flow =	255,500 L/day	383,200 L/day
Average Daily Flow, ADD =	255,500 L/day 2.96 L/s	383,200 L/day 4.44 L/s
Peaking Factor, PF (P = Population in Thousands)	PF = 3.2 / P^0.105 3.18 Using MMCD PF	PF = 1 + 14 / (4 + P^0.5) 3.78 Using Harmon PF
Potential Peak Flow, ADD x PF =	9.40 L/s	16.78 L/s
Site Area* =	172,125 sq.m.
Approx. area for infiltration* =	17.21 ha
Inflow and Infiltration*** (0.061 L/s/ha)	0.06 L/s/ha 1.0 L/s	0.13 L/s/ha 2.2 L/s
Total Potential Flow = Potential Peak Flow + Inflow and Infiltration	10.43 L/s	19.01 L/s

Circular Pipe Sections Flowing Full

Pipe Capacity

Parameter	Value
Pipe Diameter (m)	0.150
Pipe Roughness (Manning's 'n')	0.011
Slope (%)	2.00
Length (m) - Optional	100.0

Results Capacity (cms): 0.025 (l/s) 25.5 Velocity (m/s): 1.44 Time to Flow (min.): 1.16

RPM: 1750 | Discharge: 4" | Solids: 3"

Page 232–238

High-contrast version of the performance curve chart highlighting efficiency circles and impeller diameters

Detailed section of the performance curve chart showing impeller diameter curves from 12.00" to 8.50"

Notes from Curve: Provide 2 GPM flow for water jackets. Periodic cleaning of water jackets is required if gray water or sewage is used for cooling.

With Water Jacket ** With Cooling Fins

Text from bottom of pump performance data sheet

The curves reflect maximum performance characteristics without exceeding full load (Nameplate) horsepower. All pumps have a service factor of 1.2. Operation is recommended in the bounded area with operational point within the curve limit. Performance curves are based on actual tests with clear water at 70° F. and 1280 feet site elevation.

Handwritten Note: C 15.4 s Handwritten Note: 670 GPM = 152 m³/hr = 42.3 L/s

Conditions of Service: GPM: _______ TDH: _______

Page 232–238

Document Images

(4)

Interior view of a renovated kitchen with white cabinetry and appliances

Interior view of a bathroom featuring a long white vanity and a towel rack

Interior view of a dining area and living room with a wooden table and cabinet

Document identification text: DRY-PIT September 1999 Page 104

Extracted from: 2017 04 25 Joint Advisory Committee Meeting Agenda - Agenda - Pdf