August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South...
Transcript of August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South...
WSP Canada Inc. 1 Spectacle Lake Drive Dartmouth, NS B3B 1X7 T: 902-835-9955 www.wspgroup.com
WSP Canada Inc. Adress line 1 Adress line 2 Adress line 3 www.wspgroup.com
August 14, 2015
Josh DeYoung, P.Eng. Development Engineer Halifax Water
Re: Review for Case 19832 – Pre-Application by WSP Canada Inc. to rezone a portion of PID 00277228 along the Herring Cove Road from the R-1 to the R-2 Zone in the Halifax Mainland Land Use Bylaw
Dear Mr. DeYoung,
In response to your comments dated May 1, 2015 we provide the following response:
WSP is working with the developer to prepare re-zoning for a proposed large scale development at PID 00277228 in Herring Cove, Nova Scotia. The proposed Concept Plan & Servicing Schematic is attached.
A divide in the sanitary sewer sheds exists at the high point on Herring Cove Road in front of PID 00277483. An existing 600mm diameter gravity main drains from this high point southeast along Herring Cove Road. An existing 250mm diameter gravity main drains from this high point northwest along Herring Cove Road to Roach’s Pond pumping station. The pump station forcemain in turn discharges back to the 600mm diameter Herring Cove Road gravity sewer main.
As shown on the Concept Plan & Servicing Schematic, Phases 1A and Phase 2 of the development will connect to the existing sanitary gravity main on Charlton Avenue, which subsequently drains to the existing 600mm diameter gravity main heading southeast along Herring Cove Road. Phase 1B of the development is proposed to connect to the existing sanitary main on Parkmoor Avenue. This gravity main flows northeast to the existing gravity main on Herring Cove Road draining to Roach’s Pond pumping station.
Phase 1B is currently zoned as R1, however WSP is working with the developer to re-zone this area to R2. As part of the re-zoning we have been asked by Halifax Water to confirm the capacity of the existing local wastewater system. We have therefore estimated the potential loading from the increase in population density associated with the change in zoning, in order to examine the magnitude of effect on the capacity of the downstream gravity system and Roach’s Pond pumping station
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Our calculations reference the 2015 version of Halifax Water’s Design and Construction Specifications.
Roach’s Pond Pumping Station
WSP has delineated the total tributary servicing area of approximately 418 ha, outlined in the attached Figure 1. Population density for the area was estimated based on proration of the zoning areas shown in the Halifax Mainland Land Use By-Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s Pond PS comprises the following zones:
Zoning Description Area (ha) R1 Single Family 111.56 R2 Two Family 122.70
RDD Residential Development District 52.19
R-2P General Residential 40.23 RC-1 Neighbourhood Commercial 0.40 T Mobile home park 0.47 R4 Multiple Dwelling 23.42 R3 Low-Rise Apt 16.26 H Holding 8.60 P Park and Institutional 19.39 C-2A Minor Commerical 16.76 C-2 General Business 5.76 C-1 Local Business 0.32 TOTAL TO ROACH'S POND PS 418.05
The total sanitary tributary area of Phase 1B is 3.21 ha. Population density for Phase 1B was estimated based on typical lot areas as follows:
Zoning Typical Lot Size
Units/ha Estimated Total Units Phase 1B (sq ft) (ha)
R1 5000 0.046 21.53 69 R2 2500 0.023 43.06 138
Calculation of peak wet weather flows for the Roach’s Pond PS and Phase 1B tributary areas (both R1 and R2 zoning), are outlined in the attached Table 1, and summarized below:
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Peak Wet Weather Flow
(l/s) Ratio to Total
Roach’s Pond PS Total to Roach’s Pond PS 784.2 -
1B (R1 Zoning) 5.5 0.70% 1B (R2 Zoning) 9.7 1.24%
Increase R1 to R2 Zoning 4.3 0.54%
The above calculations indicate a change in zoning from R1 to R2 would result in an increase in peak flow to the Roach’s Pond pumping station of approximately 0.54%. We believe this increase is minimal and is not likely to have a significant impact on capacity of the existing Roach’s Pond pumping station.
Gravity System
The gravity system downstream of Phase 1B of the development comprises a 200mm main on Parkmoor Avenue, connecting to a 250mm main on Herring Cove Road to the Roach’s Pond PS. Pipe data from Halifax Water GIS was utilized to calculate the limiting capacity of the pipes in the existing gravity system. Table 2 indicates ratios of anticipated design flow to limiting pipe capacity as follows:
Tributary Area (ha)
Peak Wet Weather Flow (l/s) Limiting Capacity
(l/s) Q/Q
Existing Phase 1B (R2 Zoning) Total
200mm Main (Parkmoor Ave.) 3.00 9.1 9.7 18.8 25 0.77
250mm Main (Herring Cove Rd.) 6.52 18.9 9.7 28.7 63 0.46
The above calculations indicate that the existing gravity system has adequate capacity to accommodate the proposed Phase 1B of the development zoned as R2. We therefore believe a change in zoning from R1 to R2 will not have a significant impact on the downstream gravity system.
If you have any questions or require additional information please feel free to contact me.
Neil Fougere, P.Eng Project Manager – Municipal Infrastructure
Original Signed
APPENDIX Table 1: Sanitary Flow Calculations to Roach’s Pond PS
Table 2: Downstream Gravity System Capacity
Table 3: Calculation References
Figure 1: Sanitary System Capacity Review
Concept Plan & Servicing Schematic, Issued for Review August 14, 2015 by WSP.
Halifax Mainland Land Use By-Law ZM-1 – Zoning (South Section)
Table 1: Sanitary Flow Calculations to Roach’s Pond PS
Table 2: Downstream Gravity System Capacity (including Phase 1B, R2 Zoning)
Table 3: Calculation References Unit Reference: Town House Density 3.35 persons/unit 2015 HW Specifications Single Unit Density 3.35 persons/unit 2015 HW Specifications Multi-Unit Density 2.25 persons/unit 2015 HW Specifications Avg. Residential Flow 330 L/person/day 2015 HW Specifications Infiltration (2015) 24 m3/ha/day 2015 HW Specifications Safety Factor (2015) 1.25 2015 HW Specifications Commercial Population Equivalent 85 persons/ha ACWW Manual - 2.3.4.2
Commercial Peaking Factor 2.40 ACWW Manual - 2.3.4.4 (10hr/day)
R4 (highest) density 185 per/ha 75 per/ac HRM By-Law H Holding density 0 per/ha On-site septic HRM By-Law R1 Density 21.53 unit/ha 5000 sq ft min. lot HRM By-Law R2 Density 43.06 unit/ha 2500 sq ft min. lot HRM By-Law R1/R2 Average Density 32.29 unit/ha Average
Zoning Description Area Density
reference Density Population Average Dry Weather
Flow Allowance Peaking Factor
Peak Dry Weather
Flow
Tributary Infiltration
Area
Infiltration/ Inflow
Allowance Infiltration/ Inflow Flow
Safety Factor
Peak Wet Weather Flow
ha per/ha persons (l/d/person) (l/d) (l/d) (ha) (l/d/ha) (l/d) (l/d) (l/s) R1 Single Family 111.56 R1 72 8033 330 2650890 3.05 8081249 111.56 24000 2677481.18 1.25 12779043 147.91 R2 Two Family 122.70 R2 144 17669 330 5830770 2.71 15781555 122.70 24000 2944687.39 1.25 22671632 262.40 RDD Residential Development District 52.19 use avg R1/R2 108 5637 330 1860210 3.20 5945866 52.19 24000 1252489.61 1.25 8684822 100.52 R-2P General Residential 40.23 use avg R1/R2 108 4345 330 1433850 3.30 4733055 40.23 24000 965465.52 1.25 6881784 79.65 RC-1 Neighborhood Commercial 0.40 use avg R1/R2 108 44 330 14520 4.33 62808 0.40 24000 9709.776 1.25 88219 1.02 T Mobile home park 0.47 use avg R1/R2 108 51 330 16830 4.31 72587 0.47 24000 11249.328 1.25 101983 1.18 R4 Multiple Dwelling 23.42 use R4 (highest) 185 4334 330 1430220 3.30 4722501 23.42 24000 562161.024 1.25 6465287 74.83 R3 Low-Rise Apt 16.26 use R4 (highest) 185 3009 330 992970 3.44 3417109 16.26 24000 390275.808 1.25 4661662 53.95 H Holding 8.60 on-site septic 0 0 330 0 0.00 0 0.00 0 0 0 0 0.00 P Park and Institutional 19.39 use commercial 85 1648 330 543840 3.65 1984818 19.39 24000 465295.152 1.25 2946318 34.10 C-2A Minor Commercial 16.76 commercial 85 1425 330 470250 2.40 1128600 16.76 24000 402188.064 1.25 1812938 20.98 C-2 General Business 5.76 commercial 85 490 330 161700 2.40 388080 5.76 24000 138207.36 1.25 623307 7.21 C-1 Local Business 0.32 commercial 85 28 330 9240 2.40 22176 0.32 24000 7624.152 1.25 35344 0.41
TOTAL TO ROACH'S POND PS 67752339.85 784.17
Phase 1B Development R1 Single Family 3.21 R1 72 232 330 76560 4.12 315721 3.21 24000 77112 1.25 471763 5.46 R2 Two Family 3.21 R2 144 463 330 152790 3.99 609811 3.21 24000 77112 1.25 839376 9.71 Existing 200mm Gravity Main R2 Two Family 3.00 R2 144 433 330 142890 4.01 572355 3.00 24000 72105.4534 1.25 787549 9.12 Existing 250mm Gravity Main R2 Two Family 6.52 R2 144 940 330 310200 3.82 1184084 6.52 24000 156544.181 1.25 1636650 18.94
Upstream Manhole
Downstream Manhole
Upstream Invert (m)
Downstream Invert (m)
Length (m)
Pipe Slope
Pipe Diameter (mm)
Limiting Capacity (l/s) Q/Qcap
MH5715 MH5716 68.412 67.33 58.3433 1.9% 200 MH5716 MH5717 67.33 66.136 28.8141 4.1% 200 MH5717 MH5718 66.136 64.709 55.8621 2.6% 200 MH5718 MH5719 64.709 64.264 64.5793 0.7% 200 MH5719 MH5720 64.264 64.023 45.6397 0.5% 200 MH5720 MH5707 64.023 63.947 20.6787 0.4% 200 25 0.77
MH5707 MH5698 63.651 62.414 66.8856 1.8% 250 MH5698 MH5699 62.045 57.939 87.3124 4.7% 250 MH5699 MH5700 57.939 57.232 84.4912 0.8% 250 63 0.46
MH5700 MH5701 57.223 55.522 104.2123 1.6% 250 MH5701 MH5702 55.251 53.188 29.894 6.9% 250 MH5702 MH5703 53.093 52.813 38.7012 0.7% 250 MH5703 MH5704 52.758 50.956 43.2666 4.2% 250 MH5704 MH5705 50.956 42.754 38.6576 21.2% 250 MH5705 MH50447 42.51 37.48 28.097 17.9% 250 MH50447 MH50445 37.46 35.34 12.5494 16.9% 250 MH50445 MH50446 30.319 30.276 11.1977 0.4% 250 44 0.64
MH50446 PW664180 30.226 30.223 17.2282 0.0% 250 *Assumed to surcharge
WSP Canada Inc.1 Spectacle Lake Drive
Dartmouth, Nova Scotia, Canada B3B 1X7T 902-835-9955 F 902-835-1645 www.wspgroup.com
PROPOSED DEVELOPMENT (PHASE 1B)
ROACH'S POND PUMPING STATION
ROACH'S POND PSSANITARY TRIBUTARY AREA (APPROX.)
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WSP Canada Inc.1 Spectacle Lake Drive
Dartmouth, Nova Scotia, Canada B3B 1X7T 902-835-9955 F 902-835-1645 www.wspgroup.com
PHASE 1B
PHASE 1C
PHASE1A
PHASE 2
PA
RK
MO
OR
AV
EN
UE
EX
TEN
SIO
N
HAYES STREETEXTENSION
"STREET A"
"STREET B"
"X COURT"
"Y COURT"
"Z COURT"
CH
ARLTO
N
AVENU
E
EXTENSIO
N
PROPOSEDPARKLAND
PROPOSEDPARKLAND
PROPOSEDPARKLAND
PROPOSEDPARKLAND
PROPOSEDPARKLAND
PROP. PUMPSTATION
TOTAL AREA (Ha)
AVERAGE DRY WEATHER FLOW (L/s)
ESTIMATED SANITARY LOADING24.5 +/-
2.96+/-
INFLOW AND INFILTRATION FLOW (L/s)
PEAK WET WEATHER FLOW RATE (L/s)
6.80 +/-
22.84 +/-
³
TOTAL AREA (Ha)
TOTAL TRIBUTARY DRAINAGE AREA (Ha)
STORMWATER INFORMATION
PRE-DEVELOPMENT SCSRUN-OFF COEFFICIENT
POST-DEVELOPMENT SCSRUN-OFF COEFFICIENT
24.5 +/-
24.5 +/-
77
85
PHASE 1A
PHASE 1A
PHASE 1C PHASE 2
PHASE 2
PHASE 2
PRELIMINARY
FOR REVIEW ONLY
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Crows Nest Dr
Ramsgate
Lane
Belmont O
nThe
A rm
Win
ches
ter A
ve
Bronson Ave
Elmdale C
res
Hayes St
Cai
rn
well Cl
Lord
Dal
hous
ie D
r
Lundys Lane
Dobbin Lane
Seaview Ave
ChambersCrt
Saraguay Pl
Birchfield Cres
Fays Lane
Country Cres
Sharleen Crt
Goldfinch
Walk
Carnation C
res
MarineD
r
Ble
nhei
m T
err
Ballantrae Lane
Guildw
ood Cres
Honeydale C
res
Milit
ary Rd
Blue Willow Crt
St Cece lia Dr
Lear
ning
Lane
Dron
achy Lane
Sta
nhop
e S
t
Turquoise Lane
Regan Dr
Edzell Castle Cir
Crabapple Lane
Marlborough Wds
Benalder Lane
Homestead Rd
Ness
Lane
Brenton Pl
Willowdale Terr
Meadow Green Walk
York Redoubt C
res
Loop Rd
Pine
Hi ll CresFernwood Lane
Battery 18th Rd
Ferg
uson
Lan
e
Ursula C
rt
Raithpark Lane
Randhawa Crt
Fara day Lane
Kirk
cald
y La
ne
Colonial C
res
Frances Crt
Dunbar Lane
Fife
Lan
e
Purcells Cove R
d
Fergusons CoveR
d
Herring C
ove Rd
Old Sambro Rd
Cranberry C
rt
Brodick Lane
Bry
ceda
le L
ane
Soa
psto
ne L
ane
Balw
earie Lane
Pinehaven Dr
Moonstone Lane
Loughborough Lane
Boulderbrook Lane
Cro
mw
ell R
d
Payzant Ave
Wright Ave
Sackville St
"This map is an unofficial copy which shows only the zoningfor the portion of the City of Halifax indicated below.
The complete package of zoning regulations for the City ofHalifax is comprised of the Land Use Bylaw, Zoning Map,Schedule Map, Height Precinct Map, View Plane Map,McIntosh Run Flood Plane Map, and Building Line Plan.
Reference to the complete package must be made in order todetermine allowable land uses for any land in the city."
HALIFAXMainland Land Use By-Law
ZM-1 - Zoning(South Section)
Legend
R-1 Single Family
R-2 Two Family Dwelling
R-2P General Residential
R-2T Townhouse Zone
R-2AM Gen. Res. Conversion
R-3 Low-Rise Apartment
R-4 Multiple Dwelling
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RC-1 Neighbourhood Commercial
C-1 Local Business
C-2A Minor Commercial
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
C-2B Highway Commercial
C-2 General Business
I-1 General Industrial
I-2 Radio Transmitter
I-3 General Industrial
P Park and Institutional
U-2 High Density University
T Mobile Home Park
H Holding
W Watershed
RDD Residential Dev. District
WCDD Wentworth CDD
K Schedule K
PWS Public Water Supply
RPK Regional Park
US Urban Settlement
UR Urban Reserve
PA Protected Area
±0 400 800
metres
Amended: 18 October 2014Updated: 18 October 2014
Compiled by Planning Services. The accuracy of any representation on this plan is not guaranteed.
Key Map
±
WA Water Access