appendix d water management assessment summary centre... · appendix d water management assessment...

Shire of RoebourneTown Planning Scheme No. 8Amendment No. 29

APPENDIX D

WATER MANAGEMENT

ASSESSMENT SUMMARY

J5149b 19 September 2012 1

Jim Davies & Associates Pty Ltd

ABN 24 067 295 569Suite 1, 27 York Street, SubiacoPO Box 117, Subiaco WA 6008

Ph: (08) 9388 2436Fx: (08) 9381 9279

[email protected]

To : TME Date : 19 Sept 12 Attention : Kris Kennedy Our Ref : J5149b

Email : [email protected] Pages : 6

LAZY LANDS, KARRATHA

WATER MANAGEMENT SUMMARY – LOT 617 SHADWICK DRIVE, MILLARS WELL (P17)

Kris,

Please find below summary report prepared by JDA Consultant Hydrologists providing hydrological advice to support Scheme Amendment Rezoning of Lot 617 Shadwick Drive, Millars Well (P17), from ‘Parks, Recreation & Drainage’ to ‘Urban’. The report is presented in the following sections:

1. Introduction

2. Lot Details

3. Major Flooding & Storm Surge

4. Catchment Drainage

5. Lot Drainage

6. Conclusions

1. Introduction

The Department of Regional Development and Lands (RDL) through its Pilbara Cities Office (PCO) is carrying out a residential infill program in Karratha known as ‘Lazy Lands’. The Lazy Lands Program seeks to identify vacant Crown Land within existing urban areas that can be quickly brought into the residential land release pipeline to help alleviate the current supply shortage of development-ready land in Karratha.

A total of 61 parcels of land have previously been identified with 7 being targeted for release as a priority under Stage 1. Lot 617 Shadwick Drive, Millars Well, is one of 7 of the Stage 1 priority sites. Lot 617 is denoted as site P17 in Appendix 2-3 of RDL’s tender document for the Lazy Lands Project.

Detailed 2D flood modelling at a 2m x 2m grid is currently being carried out by JDA as part of this study to determine the 100 yr ARI flood levels and extent across Karratha for the current climate scenario (2010). The results will be used to assess any impact of flooding on the sites from any adjacent drain and inform future finished Lot level design. The 2D flood modelling results will be reported in a Local Water Management Strategy (LWMS).

2. Lot Details

Referring to Figure 1, the Lot is 0.09 ha and located 4 km west of the Karratha City centre, within the suburb of Millars Well. Lot access is off Shadwick Drive with an

JDA Consultant Hydrologists


JDA

existing residential building located adjacent to the Lot to the west and a footpath to the east.

Existing natural surface contours are shown on Figure 1 indicating the Lot is relatively flat with an elevation of 16.0 mAHD along the south-western boundary with a slight gradient toward the street front at the northern boundary with an elevation of 15.5 mAHD. Lot 617 is part of a Parks, Recreation and Drainage reserve as shown on Figure 1.

3. Major Flood & Storm Surge

The draft Karratha Coastal Vulnerability Study (KCVS) prepared by JDA et. al. (2011) on behalf of LandCorp provides rainfall runoff, storm surge and associated flood level 2-Dimensional (2D) modelling and mapping across the Karratha region. The KCVS was produced to assist and inform future development of the Karratha region at a district scale level of detail. Modelling was undertaken for various climate scenarios including present day (2010) and 50 year (2060) and 100 year (2110). Note that flood levels (in mAHD) produced are based on regional scale modelling and are subject to refinement to the local scale.

Email advice from the Department of Water (DoW) on 10 September 2012 to the Shire of Roebourne is attached. This confirms that the natural surface of the Lot is greater than the 100 year Average Recurrence Interval (ARI) and 500 Year ARI water levels, from storm surge and catchment flooding, for the 2010, 2060 and 2110 climate scenarios from the draft KCVS. DoW notes that this advice is related to storm surge and major flooding only and does not take into account local stormwater drainage.


Figure 1 shows that Lot 617 is at the upper reaches of Catchment 8, which is one the smaller catchments in the Karratha area (GHD, 2010), with the boundary to the south along Dampier Road. Lot 617 is not located immediately adjacent to any open drainage channel. The closest open drainage channel starts approximately 140m to the west which is one of the main drainage arteries in Catchment 8 (GHD, 2010).

5. Lot Drainage

Stormwater runoff from the Lot is directed toward Shadwick Drive which then flows northwest with the fall in road elevation. There is very little contributing upstream catchment expected to influence the Lot and all local stormwater runoff is anticipated to be contained within the depth of the road kerb.

During development, it is envisaged that stormwater runoff will continue to discharge directly into the Shadwick Drive local road drainage system at the front of the Lot. Detail design of management of stormwater will be presented in a Stormwater Management Plan, required by the Shire of Roebourne, to be submitted with the Development Application. Criteria to be addressed include;

2D flood modelling 100 yr ARI water level in adjacent drain

Finished Lot level design

Local stormwater management

Runoff direction

Erosion control



JDA

6. Conclusions

For Major Flood & Storm Surge, DoW has advised that the natural surface of Lot 617 is above the 100 year ARI and 500 year ARI events.

For Catchment Drainage, Lot 617 is located within Catchment 8 (GHD, 2010) which is one the smaller catchments in the Karratha area. There are no adjacent open drainage channels.

For Lot Drainage, stormwater runoff is directed toward Shadwick Drive at the northern boundary of the Lot which then flows northwest within the width of the road extent. Stormwater runoff is anticipated to be contained with the depth of the road kerb.

A Stormwater Management Plan will be required by the Shire of Roebourne to support a future Development Application for Lot 617.

This Water Management Summary supports the proposed Scheme Amendment and Rezoning from ‘Parks, Recreation & Drainage’ to ‘Urban’.

References

GHD (2010), Report on Karratha Drainage Assessment - Drainage Management Plan; for Shire of Roebourne JDA Consultant Hydrologists, GEMS, Damara WA, Coastal Zone Management & DHI Water & Environment (2011) Karratha Coastal Vulnerability Study (Draft); for LandCorp

If you have any queries, please do not hesitate to contact Matthew Yan or Damien Slack.

Yours sincerely,

JDA CONSULTANT HYDROLOGISTS DISCLAIMER

This document is published in accordance with and subject to an agreement between JDA Consultant Hydrologists (“JDA”) and the client for whom it has been prepared (“Client”), and is restricted to those issues that have been raised by the Client in its engagement of JDA. It has been prepared using the skill and care ordinarily exercised by Consultant Hydrologists in the preparation of such documents.

Any person or organisation that relies on or uses the document for purposes or reasons other than those agreed by JDA and the Client without first obtaining a prior written consent of JDA, does so entirely at their own risk and JDA denies all liability in tort, contract or otherwise for any loss, damage or injury of any kind whatsoever (whether in negligence or otherwise) that may be suffered as a consequence of relying on this document for any purpose other than that agreed with the Client.

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From: SMYTHE Toni [mailto:[email protected]]Sent: Monday, 10 September 2012 9:25 AM To: Monica Sullivan Subject: RE: Flood advice for Lazy Lands sites

Hi Monica,

Please find the below advice for Lot 617 Shadwick Drive in Millars Well.

The Department of Water, in carrying out its role in floodplain management, provides advice andrecommends guidelines for development on floodplains with the object of minimising flood risk anddamage.

The preliminary results of the Karratha Coastal Vulnerability Study show that in this area theinundation levels for large storm surge events are expected to be:

100 year ARI 500 year ARIAt 2010 14.3m AHD 14.6m AHDAt 2060 14.3m AHD 14.8m AHDAt 2110 14.3m AHD 14.9m AHD

The estimates include flooding generated from storm surge and catchment flooding, and theestimates for 2060 and 2110 include an allowance of 0.3 metres and 0.9 metres respectively forpossible future sea level rise.

The available contour information for the area shows the general natural surface level of the lot tobe between ~15.5 m AHD and 16.5 m AHD (see attached plan).

Please note that this advice is related to storm surge and major flooding only and does not take intoaccount local stormwater drainage.

For further information please contact Simon Rodgers on (08)6364 6923 or via email [email protected].

Kind regards,

Toni SmytheEngineer, Floodplain ManagementDepartment of WaterTelephone: (08) 6364 7413E mail: [email protected]

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J5149f 19 September 2012 1



Ph: (08) 9388 2436Fx: (08) 9381 9279

[email protected]

To : TME Date : 19 Sept 12 Attention : Kris Kennedy Our Ref : J5149f



WATER MANAGEMENT SUMMARY – LOT 655 WARRIER STREET, BULGARRA (P55)

Kris,

Please find below summary report prepared by JDA Consultant Hydrologists providing hydrological advice to support Scheme Amendment Rezoning of Lot 655 Warrier Street, Bulgarra (P55), from ‘Parks, Recreation & Drainage’ to ‘Urban’. The report is presented in the following sections:

1. Introduction

2. Lot Details



5. Lot Drainage

6. Conclusions

1. Introduction


A total of 61 parcels of land have previously been identified with 7 being targeted for release as a priority under Stage 1. Lot 655 Warrier Street, Bulgarra, is one of 7 of the Stage 1 priority sites. Lot 655 is denoted as site P55 in Appendix 2-3 of RDL’s tender document for the Lazy Lands Project.

Detailed 2D flood modelling at a 2m x 2m grid is currently being carried out by JDA as part of this study to determine the 100 yr ARI flood levels and extent across Karratha for the current climate scenario (2010). The results will be used to assess any impact of flooding on the Lot from the adjacent drain and inform future finished Lot level design. The 2D flood modelling results will be reported in a Local Water Management Strategy (LWMS).

2. Lot Details

Referring to Figure 1, the Lot is 0.3 ha and located 2.2 km east of the Karratha City centre, within the



JDA

suburb of Bulgarra. The Lot is fronted by Warrier Street to the west and an open drain to the east. There are existing residential buildings located adjacent to the Lot to the north and south.

Existing natural surface contours are shown on Figure 1 indicating the Lot is relatively flat with a south to north sloping gradient with elevations ranging from 9.0 mAHD to 8.5 mAHD respectively. Lot 655 is part of a Parks, Recreation and Drainage reserve as shown on Figure 1.





Figure 1 shows that Lot 655 is located at the midpoint of drainage Catchment 19, one of the larger catchments in the Karratha area (GHD, 2010). The main open drainage channel for this catchment is located immediately to the east of Lot 655 and flows in a northerly direction. The drainage reserve for this channel is approximately 40m wide, with the main channel being approximately 10m wide with an approximate flood depth of 0.5m. The invert of the main channel is approximately 0.5m lower than the adjacent lot level.

Desktop assessment indicates that flooding in a 100 Year ARI rainfall event does not exceed 0.5m. There is an opportunity to increase the width and hence capacity of the main drainage channel within the existing 40m width of the drainage reserve, if required.

5. Lot Drainage

Stormwater runoff from the Lot currently flows east toward the open drainage channel. During development, it is envisaged that stormwater runoff will discharge to either the local road drainage system at the front of the Lot, or alternatively a flow path is provided to discharge directly into the open drainage channel at the rear of the Lot.

Detail design of management of stormwater will be presented in a Stormwater Management Plan, required by the Shire of Roebourne, to be submitted with the Development Application. Criteria to be addressed include;





JDA


Runoff direction

Erosion control

6. Conclusions


For Catchment Drainage, Lot 655 is located within Catchment 19 (GHD, 2010) which is one of the larger catchments in the Karratha area. There is an adjacent open drainage channel to the east with the invert of the main channel being approximately 0.5m lower than the Lot. Desktop assessment indicates that flooding in a 100 Year ARI rainfall event does not exceed 0.5m.

For Lot Drainage, stormwater runoff flows east toward the open drainage channel which then flows in a northerly direction.



References



Yours sincerely,




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P55

From: SMYTHE Toni [mailto:[email protected]]Sent: Friday, 7 September 2012 3:37 PM To: Monica Sullivan Subject: RE: Flood advice for Lazy Lands sites

Hi Monica,

Please find the below advice for Lot 655 Warrier St in Bulgarra.



100 year ARI 500 year ARIAt 2010 7.8m AHD 7.9m AHDAt 2060 7.8m AHD 7.9m AHDAt 2110 7.8m AHD 8m AHD


The available contour information for the area shows the general natural surface level of the lot tobe greater than 8 m AHD (see attached plan).



Kind regards,


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J5149g 19 September 2012 1



Ph: (08) 9388 2436Fx: (08) 9381 9279

[email protected]

To : TME Date : 19 Sept 12 Attention : Kris Kennedy Our Ref : J5149g



WATER MANAGEMENT SUMMARY – LOT 1926 RIDLEY STREET, BULGARRA (P60)

Kris,

Please find below summary report prepared by JDA Consultant Hydrologists providing hydrological advice to support Scheme Amendment Rezoning of Lot 1926 Ridley Street, Bulgarra (P60), from ‘Parks, Recreation & Drainage’ to ‘Urban’. The report is presented in the following sections:

1. Introduction

2. Lot Details



5. Lot Drainage

6. Conclusions

1. Introduction


A total of 61 parcels of land have previously been identified with 7 being targeted for release as a priority under Stage 1. Lot 1926 Ridley Street, Bulgarra, is one of 7 of the Stage 1 priority sites. Lot 1926 is denoted as site P60 in Appendix 2-3 of RDL’s tender document for the Lazy Lands Project.

Detailed 2D flood modelling at a 2m x 2m grid is currently being carried out by JDA as part of this study to determine the 100 yr ARI flood levels and extent across Karratha for the current climate scenario (2010). The results will be used to assess any impact of flooding on the sites from any adjacent drain and inform future finished Lot level design. The 2D flood modelling results will be reported in a Local Water Management Strategy (LWMS).

2. Lot Details

Referring to Figure 1, the Lot is 0.5 ha and located 2.0 km east of the Karratha City centre, within the



JDA

suburb of Bulgarra. The Lot is fronted by Ridley Street to the north Millstream Road to the south. There are existing residential buildings located adjacent to the Lot to the east and west.

Existing natural surface contours are shown on Figure 1 indicating the Lot has a south to north sloping gradient with elevations ranging from 16.0 mAHD to 13.5 mAHD respectively. Lot 1926 is part of a Parks, Recreation and Drainage reserve as shown on Figure 1.





Figure 1 shows that Lot 1926 is located at the midpoint of drainage Catchment 19, one of the larger catchments in the Karratha area (GHD, 2010). Lot 1926 is not located immediately adjacent to any open drainage channel. The closest open drainage channel is located approximately 320m to the east which is one the main drainage arteries in Catchment 19 (GHD, 2010).

5. Lot Drainage

Stormwater runoff from the Lot is directed toward Ridley Street which then flows to the east with the fall in road elevation. There is little contributing upstream catchment expected to influence the Lot and all local stormwater runoff is anticipated to be contained within the depth of the road kerb.

During development, it is envisaged that stormwater runoff will continue to discharge directly into the Ridley Street local road drainage system at the front of the Lot. Detail design of management of stormwater will be presented in a Stormwater Management Plan, required by the Shire of Roebourne, to be submitted with the Development Application. Criteria to be addressed include;




Runoff direction

Erosion control



JDA

6. Conclusions


For Catchment Drainage, Lot 1926 is located within Catchment 19 (GHD, 2010) which is one of the larger catchments in the Karratha area. There are no adjacent open drainage channels.

For Lot Drainage, stormwater runoff is directed onto Ridley Street at the northern boundary of the Lot which then flows east within the width of the road extent. Stormwater runoff is anticipated to be contained within the depth of the road kerb.



References



Yours sincerely,




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From: SMYTHE Toni [mailto:[email protected]]Sent: Monday, 10 September 2012 9:48 AM To: Monica Sullivan Subject: RE: Flood advice for Lazy Lands sites

Hi Monica,

Please find the below advice for Lot 1926 Ridley St in Bulgarra.



100 year ARI 500 year ARIAt 2010 12.7 m AHD 12.7 m AHDAt 2060 12.7 m AHD 13 m AHDAt 2110 12.7 m AHD 13.1 m AHD


The available contour information for the area shows the general natural surface level of the lot tovary from ~13.5 m AHD to 16 m AHD (see attached plan).



Kind regards,


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