APPENDIX I STORMWATER CATCHMENTS

Hearing Evidence – Wairau Estate Proposed Subdivision ‐ OAKURA

RPT‐2351‐03 Hearing Evidence 3

APPENDIX I STORMWATER CATCHMENTS

WairauEstate

Wairau Stream

Wairau Stream

Wairau Stream

Wairau Stream

NPOB Surf Club

Matekai Stream

'The Paddocks'

'The Paddocks' StormwaterAttenuation Dam

Wairau Stream Tributary

Wairau Catchment Boundary555 hectares

WAIRAU ESTATE - Private Plan Change 4828A Manadon StreetPO Box 116

New Plymouth 4340New Plymouth 06 758 5342

Hawera 06 278 4456www.mckinlaysurveyors.co.nz

JOB NoTOTAL AREA

RECORD OF TITLE

DWG NoDATETERRITORIAL AUTHORITY

SHEET OFSCALE

APPLICANT

New Plymouth District CouncilOakura Farm Park Limited

O-160109

04/06/19 CAT_01

1:15,000@A3 1 1

Wairau Stormwater Catchment

TITLE

T his plan is prepared only f or the purpose of obtaining a Resource Consent pursuant to the Resource Management Act 1991.It must not be used f or any other purpose. Areas and dimensions are approximate only and are subject to change on f inal f ield survey.

Wairau Stream

Wairau Stream

NPOB Surf Club

Matekai Stream

'The Paddocks'

'The Paddocks' StormwaterAttenuation Dam

Wairau Stream Tributary

Tui Grove

Cunningham Lane

Private ROW

Public Reserve

Matekai Sub Catchment Discharge

Telford Tce

Pitcairn Street

The Outlook

McFarlane Street

Wairau CatchmentBoundary

Wairau CatchmentBoundary

nattenuated Stormwater Point DischargeḁAttenuated Stormwater Point DischargeWairau Estate - Proposed Stormwater Attenuation

LEGEND

WAIRAU ESTATE - Private Plan Change 4828A Manadon StreetPO Box 116

New Plymouth 4340New Plymouth 06 758 5342

Hawera 06 278 4456www.mckinlaysurveyors.co.nz

JOB NoTOTAL AREA

RECORD OF TITLE

DWG NoDATETERRITORIAL AUTHORITY

SHEET OFSCALE

APPLICANT

New Plymouth District CouncilOakura Farm Park Limited

O-160109

04/06/19 CAT_02

1:7,500@A3 1 1

Wairau Stormwater Catchment

TITLE

T his plan is prepared only f or the purpose of obtaining a Resource Consent pursuant to the Resource Management Act 1991.It must not be used f or any other purpose. Areas and dimensions are approximate only and are subject to change on f inal f ield survey.


RPT‐2351‐03 Hearing Evidence Page 14

APPENDIX II JSL PLANS – HOLDOM



APPENDIX III WAIRAU ESTATE ACCESS CULVERT CALCULATIONS

Date 7/6/2019 Job No. 2351

By K Jansen Page No.

Doc No.

General Stream Characteristics

Stream Name

Catchment Area (A) 37.9 Ha Runoff Coefficient 0.45

Catchment Map

Source:

CAL-2351-01

STORMWATER CALCULATIONWAIRAU ESTATE _ OAKURA

Un‐named Tribituary of Wairau

TRC GIS Database

Date 7/6/2019 Job No. 2351


Doc No. CAL-2351-01


Overland Flow

Equal Area Stream Gradient

Elevationdistance between contours

Total rise Stream length area under graph

Accumulated area Average slope

37 0 0 0 0 0 0 37

40 121 3 121 181.5 181.5 0.024793388

45 274 8 395 1507 1688.5 0.021643967

50 163 13 558 1711.5 3400 0.021839391

55 75 18 633 1162.5 4562.5 0.022773273

60 48 23 681 984 5546.5 0.023919648

65 31 28 712 790.5 6337 0.025000789

70 13 33 725 396.5 6733.5 0.025620927

‐37 725 0 6733.5 0.025620927 55.57517241

AVERAGE SLOPE = 0.026 m/m

0

10

20

30

40

50

60

70

80

0 100 200 300 400 500 600 700 800

Elev

atio

n (m

)

Distance (m)

Equal Area Grade for Stream

Date 7/6/2019 Job No. 2351


Doc No. CAL-2351-01


Time of Concentration

Ramser‐Kirpich Method US Soil Conservation Bransby-Williams Rural Catchments

Length (m) 725.00 Length (km) 0.73 Length (km) 0.73 Length (km) 0.73

L0.77 159.39 L3 0.38 L1.2 0.68 42.05

RL top 70.00 Height diff 33.00 Area(km2) 0.38 Area(km2) 0.38

RL bott 37.00 0.87L3 0.33 A0.1 0.91 A0.1 0.91

RL diff 33.00 0.87L3/H 0.01 H 33.00 Slope (m/km) 256.21

Sa 0.03 T.O.C. (hrs) 0.17 H0.2 2.01 EAS0.2 3.03

Sa-0.385 4.10 T.O.C(hrs) 0.35 2.751584728

T.O.C(min) 12.74 T.O.C(min) 10.21 T.O.C(min) 21.29 T.O.C(min) 15.28

AVERAGE T.O.C. (min) = 14.88

AVERAGE T.O.C. (min) = 11.06EXCLUDING RURAL CATCHMENTS

SELECTED T.O.C. (min) =

Rainfall Intensity

Source:

Culvert Design ‐ Wairau Estate Bund Pipes

Pipe Diameter (D) 1.05 m

Flow Depth (y) 1 m

Bottom Slope (S) 1%

Pipe Type UPVC

Manning's 'n' 0.013

θ 5.40 rads

Flow Area (A) 0.85 m2

Wetted Perimeter (P) 2.84 m

Hydraulic Radius ( R ) 0.30 m

Relative Depth (y/D) 0.95

Froude Number 1.10

Required Capacity (ARI) 10

Discharge Demand (Q*) 2.85

Discharge Capacity (Q) 2.933 m3/s Q = (1/n) A R2/3 S1/2

Capacity OK

Velocity (V) 3.45 m/s V = Q / A

50 43.3 86.6 4.10

100 50.5 101 4.78

10 30.1 60.2 2.85

20 35.3 70.6 3.34

2 19.9 39.8 1.89

5 25.5 51 2.42

HIRDS V3

ARI (years) Rainfall Depth (mm) Rainfall Intensity (mm/hr) Flow (m3/s)Q* = CIA/360

30



APPENDIX IV NPDC PLANNERS REPORT – OAKURA REZONING PLAN

CHANGE ‐ APPENDIX 7

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APPENDIX V OAKURA WATER USAGE

OAKURA MAXIMUM WATER USAGE

OAKURA AVERAGE WATER USAGE

APPENDIX I STORMWATER CATCHMENTS

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