water management report rev b - major projects

EMIRATES LUXURY RESORT

WOLGAN VALLEY

WATER MANAGEMENT REPORT

Emirates Resorts C/- Clifton Coney Group Level 18 Citigroup Centre 2 Park Street Sydney NSW 2000 Attention: Mr. Tony Burg

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Q:\Jobs2005\S05066 - Emirates Luxury Resort Lithgow NSW\Admin\Report\Management Reports\Water Management Report Rev B.doc 2

Review and Approval Record

Rev Date Description of Release Prepared By Reviewed By Approved By

A 14/09/06 Issue for Comment DC JC

B 20/11/06 Issue for Approval DC JC DC

This document is and shall remain the property of Steve Paul & Partners. The document may only be used for the purpose for which it was commissioned and in accordance with the Terms of Engagement for the commission. Unauthorised use of this document in any form whatsoever is prohibited.

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INDEX

1 INTRODUCTION ................................................................................................................................................... 4

1.1 Background ...................................................................................................................................................... 4

1.2 Site Description................................................................................................................................................ 4

1.3 Project Description .......................................................................................................................................... 5

1.4 Water Supply System ...................................................................................................................................... 5

1.5 Site Water Demand .......................................................................................................................................... 5

2 POTABLE WATER SUPPLY NETWORK............................................................................................................. 6

2.1 Resort Water Extraction from Wolgan River ................................................................................................. 6

2.2 Onsite Bulk Water Storage Tank .................................................................................................................... 6

2.3 Site Reticulation............................................................................................................................................... 7

2.4 Flow Control System ....................................................................................................................................... 9

2.5 Dam Water Extraction from Wolgan River ..................................................................................................... 9

2.6 On Site Dam.................................................................................................................................................... 10

3 NON-POTABLE WATER SUPPLY NETWORK.................................................................................................. 10

4 RAINWATER HARVESTING............................................................................................................................... 11

5 CONCLUSION..................................................................................................................................................... 12

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1 Introduction 1.1 Background

Steve Paul and Partners have been commissioned by Clifton Coney Group on behalf of Emirates Resorts to prepare hydraulic services documentation for the proposed six star resort, to be constructed in the Wolgan Valley. This report shall be read as part of the Infrastructure Report prepared for the Development.

1.2 Site Description

The proposed development site is located on Wolgan Road, approximately 35kilometres north of Lithgow and 3 kilometres south of Newnes. The site is located near the Greater Blue Mountains World Heritage area and is bordered by the Gardens of Stone National Park, Wollemi Nation Park and licensed Crown Land as shown in Figure 1 below.

Figure 1: Locality map of the proposed development site.

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1.3 Project Description

The proposed development will see the construction of the following:

i. 40 villas

ii. Main Building incorporating Reception Area, Restaurant, Conference Centre and Amenities.

iii. Spa Facilities

iv. Staff Accommodation Facilities

v. Maintenance Facilities

vi. Stables

vii. Gatehouse

1.4 Water Supply System

The following components go towards the makeup of the overall water supply system for the development:

i. Water Supply Network.

ii. On Site Water Storage.

iii. Internal Water Reticulation System.

iv. Water Management Systems.

v. Water Supply for Fire Fighting.

vi. Rainwater Harvesting.

vii. Wastewater Reuse.

1.5 Site Water Demand

Mass Water Balance Studies have been undertaken to determine both potable and non-potable requirements for the development.

Potable water demand has been determined as 115,000litres per day or 420 megolitres per annum. The potable water demand includes allowance for the following:

i. Drinking water requirements.

ii. Personal Hygiene requirements.

iii. Cooking requirements.

The non-potable water demand for the resort has been determined at 5,000litres per day or approximately 18 megolitres per annum. The non-potable water demand includes allowance for the following:

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i. Vehicle Wash Down requirements.

ii. Mechanical Services requirements.

iii. Pool Make up water requirements.

2 Potable Water Supply Network Detailed investigations of how to provide the proposed development with a reliable and sustainable water supply have been undertaken. The proposal determined as the best and most practical solution entails the following:

i. Extraction of water from the Carne & Wolgan River Systems for discharge to an onsite bulk water storage tank.

ii. Provision of services to allow the extraction of water from the Wolgan River for discharge to an onsite dam.

iii. Provision of services to allow the extraction from an on site dam to an onsite bulk water storage tank.

iv. Reticulation from the onsite bulk water storage tank throughout the resort.

Outlined below is a brief description of the system components proposed to provide a sustainable potable water supply to the site.

2.1 Resort Water Extraction from Wolgan River

The main extraction point of water from the Carne & Wolgan River System is proposed to be adjacent to the staff precinct of the development as nominated in Figure 3. The water shall be extracted from an area in the river that will permit the construction of a specialised catchment area without impacting on the normal river flows. This dedicated catchment area shall be constructed in such a way as to significantly reduce the volume of sand and debris that is extracted with the water. Detailed in Figure 2 is a plan and section view of the proposed catchment area.

Located within the catchment area in a suction pit shall be dual heavy duty submersible pumps rated at a maximum suction of 3litres per second. The daily volume of water extracted shall be approximately 120,000litres.

From the suction pumps the water shall be boosted to the central water treatment system, located in the proposed maintenance building situated within the Staff Precinct. This water treatment system shall incorporate filtration and disinfection measures to ensure the water to supply the resort complies with the minimum standards nominated in the Australian Drinking Water Guidelines. The configuration of the system shall be determined once final water quality testing of the river water is completed.

2.2 Onsite Bulk Water Storage Tank

Once the water is treated it will discharge into the onsite bulk water storage tank located adjacent to the proposed maintenance building located in the Staff Precinct as nominated in Figure 3.

The bulk water storage tank shall have an effective capacity of 1,050,000litres. This volume of water is provided for the following uses:

i. 600,000litres – Potable water supply for 5 days.

ii. 450,000litres for building fire fighting purposes.

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Water stored within the tank shall be constantly aerated to ensure water quality is maintained at all times.

From the outlet of the tank the reticulation shall extend throughout the site as described in Section 2.3.

2.3 Site Reticulation

The site reticulation system from the onsite bulk storage tank to the individual buildings shall comprise of the following:

i. Central triplex booster pump system including dual electric variable speed constant pressure pumps to pressurise the main reticulation system on a day to day basis. A single diesel booster shall be provided on the event of a power failure to the pumps and failure of the backup diesel generators.

ii. Main Reticulation System - The main reticulation system shall extend throughout the development site to form supply system similar to that of an Authority reticulation main.

iii. Secondary Reticulation System – The secondary reticulation system shall comprise of separate potable water, fire hydrant and fire sprinkler system extending from the main reticulation system. The components of the secondary system are as follows:

a) The potable water system shall extend to the villas and connect to the rainwater storage tanks provide to each building. The water shall connect

Figure 2 – River Extraction Point Detail

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to the rainwater tanks via a float valve system to permit aeration of the water and assist in ensure water quality is maintained. Individual booster pump sets shall be provided on the outlet of each rainwater tank to pressurise each building.

b) The fire hydrant reticulation shall comprise of dual hydrant standpipes being provided on the main reticulation system throughout the development providing external protection to all building. Where internal hydrant protection is required, namely in the main building and the central staff building, a dedicated hydrant system shall extend off the main reticulation system throughout the buildings in accordance with AS2419.1.

c) Dedicated water services shall extend off the main reticulation system to supply the fire sprinkler system in the main building and central staff building.

iv. Building water treatment system – Each building shall be provided with a pressurised dual media filtration with sand and activated carbon and UV disinfection system on the outlet of the building pump system. This system shall

Point of Extraction from the Wolgan River for the Dam supply.

1,050,000litre Water Storage Tank

50mm water main from dam to bulk storage tank

116megolitre Dam Figure 3 – Proposed Water Supply System Diagrammatic

50mm water main from river to dam

Point of Extraction from the Wolgan River for the Resort supply.

50mm Standpipes

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be provided to ensure the integrity of the potable water supply is maintained right up to the point of use.

v. Building Reticulation System – The building reticulation system shall reticulate through the respective buildings connecting to all the potable water fixtures, fittings and appliances.

2.4 Flow Control System

To assist in ensuring the sustainability of the potable water supply for the proposed development, flow control systems shall be installed to monitor and control water flows throughout the site.

All sanitary fixtures shall be provided with flow control system on both the hot and cold water reticulation systems to ensure maximum flow rate to each outlet is maintained as follows:

i. Basins 6litres/minute

ii. Showers 12litres/minute

iii. Baths 9litres/minute

iv. Sinks 9litres/minute

v. Bidets 3litres/minute

The following buildings shall be provided with water meters to monitor water usage:

i. Main Building.

ii. Central Staff Building

iii. Spa Building

iv. Maintenance Building

2.5 Dam Water Extraction from Wolgan River

As part of the development, the provision for extraction of water from the Wolgan River for disposal into the onsite dam shall be provided.

The proposed provisions to extract water from the river into the dam and then from the dam to the onsite bulk water storage tank would include:

i. The provision of a 50mm water main extending between the dam and the Wolgan River. A standpipe as shown in Figure 4 shall be installed 10metres from the line of the river with a similar standpipe being located adjacent to the top of the dam wall. The extent of the pipeline is indicated in Figure 3.

ii. The provision of a 50mm water main extending between the dam and the onsite bulk storage water tank. A standpipe as shown in Figure 4 shall be located adjacent to the top of the dam wall with the discharge end of the 50mm water line interfacing with the water treatment system situated in the maintenance building within the Staff Precinct. he extent of the pipeline is indicated in Figure 3.

iii. Emirates Resorts shall provide under a separate contract a fully portable diesel booster pump capable of a suction head of 15metres and a discharge head of 25metres at a flow

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rate of 1litre per second. This pump can therefore be utilised to extract water from the river as well as the dam and shall also include a meter assembly to monitor the volumes of water being extracted from either location.

2.6 On Site Dam

The site currently has a harvestable right for the collection of rainwater falling on the site with a total storage limit of 116megolitres. An on site dam has been proposed to be constructed on site to take advantage of these harvesting rights.

The proposed location of the dam is at the southern end of the site approximately 2.5kilometres from the resort precinct as shown in Figure 3. This location has a catchment area of approximately 6,200,000m². Based on historical rainfall data and taking into consideration filtration, evaporation of the run off etc., preliminary calculations indicates the usable runoff from the catchment area to be approximately 24megolitres per annum.

Based on these figures the dam will take approximately 5years to fill provided there is no draw off during this time. Water extracted directly from the Wolgan River, as described in Section 2.1, will be utilised during this initial filling period to provide the majority of the potable water demand for the proposed development.

Given the annual runoff from the catchment area into the dam may provide 24megolitres per annum this will effectively provide approximately 55% of the potable water demand for the proposed development once the dam has reached it’s capacity.

3 Non-potable Water Supply Network Given the location of the proposed development and the lack of any Authority sewage reticulation system in the area, it is proposed to construct on site an onsite Wastewater Treatment Plant to treat the effluent generated by the development. The Wastewater Treatment Plant shall treat the effluent to a Class A water quality.

The means of disposing of the treated wastewater supply is via an irrigation system. Given the treated wastewater shall be Class A quality; the irrigation system shall be of a spray type. Refer to the Wastewater Management Report for details of the Wastewater Treatment Plant.

Figure 4 – River and Dam Extraction Standpipes

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Preliminary calculations indicate the total disposal area required to be approximately14hectares. The treated wastewater shall be utilised for irrigation of the resort precinct including the open areas between buildings and separate systems for the landscaped areas around the individual buildings. This equates to approximately 3-4hectares of area. The balance of the disposal area shall be provided at the northern end of the site as shown in Figure 3.

4 Rainwater Harvesting Rainwater storage tanks shall be provided to all buildings to supplement the water supply derived from the Invincible Mine and the Wolgan River. Rainwater storage tank sizes shall be as follows:

i. Villas – 3,000litre per villa

ii. Main Building - 2 x 20,000litre

iii. Staff Accommodation – 5,000litre per unit

iv. Spa Building – 1 x 20,000litres

v. Staff Building – 2 x 20,000litres

vi. Maintenance Building – 10,000litres

Treated Wastewater Disposal Area

Figure 3. – Treated Wastewater Disposal Area

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vii. Stables – 10,000litre

Based on the above tanks sizes and rainfall history over the past 100years (the area has on average received 640mm per annum over the past 100years), it is calculated that rainwater harvesting will satisfy approximately 10% of the potable water demand for the site.

5 Conclusion Based on the above, water supply to the site can be allocated as follows:

i. Local Rainwater Harvesting 10%

ii. Site Rainwater Harvesting into the Dam 55%

iii. Carne & Wolgan River System 35%

However reliance on the water supply from the Carne Creek and Wolgan River Systems will be greater for the first five years of the development until such time as the onsite dam has filled to capacity.

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