August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South...

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WSP Canada Inc. 1 Spectacle Lake Drive Dartmouth, NS B3B 1X7 T: 902-835-9955 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

Transcript of August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South...

Page 1: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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

Page 2: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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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:

Page 3: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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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

Page 4: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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)

Page 5: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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

Page 6: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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.)

NORTHWEST ARM

ATLANTICOCEAN

THREECORNER

POND

MCINTOSH RUNKIDSTON

LAKE

LONGLAKE

COLPITT LAKE

WILLIAMS LAKE

FROGPOND

SPRYFIELD

ARMDALE

TO ARMDALE

ROUNDABOUT

NORTHWEST

ARM

DR

IVE

HERRING COVE ROAD

TO HERRING COVE

HALIFAXHARBOUR

POINTPLEASANT

PARK

PUMPING STATION (TYP.)

SANITARY PIPE (TYP.) SANITARY FLOW DIRECTION ARROW (TYP.)

Page 7: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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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

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PROPOSEDPARKLAND

PROPOSEDPARKLAND

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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

Page 8: August 14, 2015 Josh DeYoung, P.Eng. Development Engineer€¦ · Law ZM-1 – Zoning (South Section) schematic, also attached. The tributary sanitary servicing area to Roach’s

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Penn

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ve

Claymore Ave

Melvin

Rd

Boulderwood Rd

Alumni Cres

Shoreham Lane

Forward Ave

St Michaels Ave

Bro

mle

yR

d

Green Acres Rd

Lavender Walk

Lyons Ave

Kids

ton

Rd

Dal

hous

ie S

t

Ravenscraig Dr

Litchfield Cres

Forbes St

Barclay Ave

M

arginal Rd

Roy St

Ess

o R

d

Vern

on S

t

Danforth R

d

Sarah Dr

Keyworth Lane

Caven

dish

Rd

Ann Crt

Halls Rd

Shepherd Rd

Ardwell Ave

Bryd

en A

ve

Katrina Cres

Murray Pl

Ida St

Feruz Cres

Dav

is S

t

Cherry Lane

Mcmanus Rd

Athlone Ave

Sum

mer

St

Gorsebrook Ave

Boscobel Rd

Loc kwood

Ave

Indig

oW

a lk

Bilton Lane

Aldergrove Dr

Tower Terr

Linden Lane

Pearl St

Lois Lane

Love

ll La

ne

Fenwick St

N itaLane

Shaw Cres

Fotherby Ave

Wal

nut S

t

Coba

lt Walk

Rhuland St

Co lpitt Lake Rd

Tho r

nva l

eA

ve

Emscote Dr

Drum

dona ldR

d

Gemstone Crt

Clearview St

Brick Lane

Birc

hdal

e Av

e

Hillary St

Hearthwood Cres

Aikenhead Rd

Mica Cres

Whalen Ave

Lila

c S

t

Trelyn Rd

Umlahs Dr

Winwick Rd

Rainforth A

ve

Kenwood Ave

Arnold Dr

W himsical LakeCre

s

Granby C

rt

Macleod Dr

Trout Run

Foxwood Terr

Hubleys Dr

Dekker St

Lem on Walk

Avon Cres

Lets

onC

rt

Yeadon

St

Web

ster

Ter

r

Cam

pbel

l Dr

Milton Dr

Lind

ola

Pl

Charlton Ave

Rexdale Ave

Mclennan Ave

Nelson

Ave

Emerald C

res

Ivylea Cres

Kate

Crt

Schnare St

Mcculloch Crt

Twin Oaks Rd

Che

stnu

t St

Dun

nike

r Rd

Torpedo Lane

Mcmullen Rd

Bower Rd

Devon C

res

Morris St

Topaz Lane

Arthur St

Harrington Dr

Juniper Cres

Pot

tery

Lane

Larc

h S

t

Hadley Cres

Lanark St

Marie Ave

Sag

ewoo

dL a

ne

OrangeW

alk

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