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Integrated Water Cycle Management Strategy and Strategic Business Plan

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Integrated Water Cycle Management Strategy and Strategic Business Plan Eurobodalla Shire Council Integrated Water Cycle Management Strategy and Strategic Business Plan FINAL November 2016 EUROBODALLA SHIRE COUNCIL – IWCM STRATEGY AND SBP Eurobodalla Shire Council IWCM Strategy and Strategic Business Plan Prepared on behalf of Eurobodalla Shire Council by Hydrosphere Consulting. Suite 6, 26-54 River Street PO Box 7059, BALLINA NSW 2478 Telephone: 02 6686 0006 Facsimile: 02 6686 0078 © Copyright 2016 Hydrosphere Consulting Cover images: Deep Creek Dam (Eurobodalla Shire Council), Moruya River (http://www.warrenwindsports.com.au/) and Batemans Bay (Eurobodalla Shire Council). PROJECT 12-050 – EUROBODALLA IWCM STRATEGY AND SBP REV DESCRIPTION AUTHOR REVIEW APPROVAL DATE 0 Draft for Council review R. Campbell M. Howland M. Howland 26/4/16 1 Updated with water supply data R. Campbell M. Howland M. Howland 2/6/16 2 Minor edits R. Campbell R. Campbell 10/6/16 3 Minor edits R. Campbell R. Campbell 17/6/16 4 Updated financial plan R. Campbell R. Campbell 25/11/16 EUROBODALLA SHIRE COUNCIL – IWCM STRATEGY AND SBP DOCUMENT STRUCTURE Eurobodalla Shire Council has reviewed and updated its Integrated Water Cycle Management (IWCM) Strategy and Strategic Business Plan (SBP). This document addresses the requirements for both the IWCM Strategy and SBP. Part A of this document provides the information required for the IWCM Strategy development as listed in the Integrated Water Cycle Management Strategy Check List – July 2014 (NSW Office of Water, 2014a). Background data are provided in the IWCM Issues Paper (Hydrosphere Consulting, 2016). Part B of this document provides further detail on IWCM options and scenarios. Part C and Part D provide the additional information required for the SBP and financial plan development as listed in the Water Supply and Sewerage Strategic Business Planning and Financial Planning Check List – July 2014 (NSW Office of Water, 2014b). Page I EUROBODALLA SHIRE COUNCIL – IWCM STRATEGY AND SBP EXECUTIVE SUMMARY In April 2003, Eurobodalla Shire Council (ESC) adopted its first Integrated Water Cycle Management (IWCM) Strategy. Key components of the 2003 IWCM Strategy have been implemented including pricing and demand management, water supply improvements, water filtration plants, sewerage system and STP augmentation and the development of village sewerage schemes. Council continues to undertake strategic planning of its urban water services including review of key data such as population growth, water supply availability and servicing requirements. The majority of towns and villages in Eurobodalla Shire are supplied with water through the regional water supply scheme. There are currently five sewerage schemes serving the majority of towns and villages. The permanent resident population in the Shire is predicted to increase from 38,800 in 2016 to 49,000 in 2046 (0.88% p.a.) and the number of dwellings is predicted to increase from 23,540 to 26,600 in 2031. The current average annual potable water demand (4,840 ML/a) is predicted to increase to 6,125 ML/a by 2046. There is a clear variation in peak and off-peak demand for urban water services due to the high proportion of tourists in the Shire. The key issues addressed by this current IWCM Strategy (i.e. this document) are drought security, sewerage system and treatment capacity and the adequacy of village water supply and sewerage services. This current IWCM Strategy has been developed from a review of Council’s adopted strategic direction and considers the available information in developing ESC’s future urban water strategy. In general, this IWCM Strategy confirms the appropriateness of Council’s current strategic direction. The key management issue faced by ESC is water supply security. Based on secure yield analysis, the existing supply is expected to be sufficient to meet demand until 2020. The secure yield of the existing headworks has also been assessed based on the rules documented in draft water sharing plans (WSPs) for the Clyde River, Deua River and Tuross River Unregulated and Alluvial Water Sources, which are expected to be gazetted in 2016. The secure yield analysis has been undertaken for current and future conditions assuming 1°C and 2°C warming due to climate change. If the WSP is gazetted with the proposed extraction rules, the secure yield will decrease by 400 ML/a and water supply sources will not be sufficient to supply the dry year demand during a repeat of the worst drought. The current potable water demand management measures have been successful and the current expenditure on water conservation measures is considered to be appropriate. The existing effluent management practices are also considered to be the most appropriate and additional effluent reuse is not considered to be warranted to increase security of supply. Actions from the 2003 IWCM Strategy have been implemented including water supply system modifications including increased raw water transfer (harvesting of high river flows) and storage in Deep Creek Dam, groundwater extraction from Tuross bores and water filtration plants in the south and north. Council has also progressed the design and approvals for a new 3 GL southern storage and increased transfer capacity. This will become the major component of the next stage of the water supply augmentation combined with increased treatment capacity and transfer from south to north in the longer term (from a new 25 ML/d southern WTP near the southern dam). The proposed water supply augmentation strategy (shown in Figure 1 and Figure 2) will provide the required drought security with staged implementation of the strategy components. This strategy assumes the WSPs are gazetted and also considers the impacts of climate change and population growth. The forecast dry year demand and the secure yield of the water supply augmentation strategy are shown in Figure 3. The long-term water supply strategy also includes supplementary water supplies for Nelligen and South Durras. Significant expenditure on water supply asset renewals and system upgrades has also been included in the capital works program. Page III EUROBODALLA SHIRE COUNCIL – IWCM STRATEGY AND SBP Figure 1: Water Supply Augmentation Strategy Page IV EUROBODALLA SHIRE COUNCIL – IWCM STRATEGY AND SBP Figure 2: Water Supply Augmentation Strategy Schematic Page V EUROBODALLA SHIRE COUNCIL – IWCM STRATEGY AND SBP 8,000 2030 onwards: Increase in yield to 7,302 ML/a with 25 ML/d southern Secure yield of augmented system reduced with WTP and 20 ML/d transfer to north by 2029 current rate of climate change 7,000 Increase in yield to 5,884 ML/a with 3GL southern dam in 2021 (+800 ML/a) 6,000 Secure yield reduced from 5,484 to 5,084 ML/a with WSP in 2016 5,000 (-400 ML/a) 2016 - 2030: Volume (ML/a) Volume 4,000 Secure yield not reduced with current rate of climate change (1°C by 2030) due to system constraints 3,000 2,000 2005 2010 2015 2020 2025 2030 2035 2040 2045 Projected Dry Year System Demand (2014 estimate) Current Secure Yield (without WSP) Current Secure Yield (with WSP) Secure yield with 3GL southern dam Secure yield with new 25 ML/d southern WTP Figure 3: Forecast Dry Year Demand and Secure Yield of Proposed Water Supply Augmentation Page VI EUROBODALLA SHIRE COUNCIL – IWCM STRATEGY AND SBP Sewer network modelling has been completed for Moruya, Tuross, Batemans Bay and Tomakin sewerage systems and is in progress for Narooma. This has evaluated system flows, predicted overflow locations and frequency to identify catchments/locations that would benefit from sewer relining to reduce inflow and infiltration. Individual assets will be replaced/refurbished on a priority basis as part of the asset renewal program based on the results of CCTV inspections and the system modelling. Four out of the five STPs experience clear variation between off-peak and peak loads and the treatment capacity is insufficient to treat the peak loads. This is largely due to the high proportion of holiday visitors but is exacerbated by high inflow and infiltration in some sewer catchments. Transfer of the southern catchments from Batemans Bay STP to Tomakin STP will address capacity issues at Batemans Bay, optimise the use of existing assets, utilise a better performing ocean outfall at Tomakin and allow more future reuse options at Tomakin than at Batemans Bay. STP upgrades and inflow and infiltration reduction measures will be progressively implemented in parallel with scheduled asset upgrades. The risks to the environment and public health, community opinions, technical considerations and the availability of funding have been considered in the prioritisation of village water supply and sewerage schemes. While non-build options such as on-site sewerage management system (OSSM) inspections, water sensitive urban design and water conservation measures can reduce the risks of OSSMs and should be Council’s focus until improved management systems are provided, it is considered that a significant residual risk from the village OSSMs remains. The IWCM Strategy includes the provision of improved water supply and sewerage services to all villages by 2036, depending on community consultation and funding. The sewerage augmentation strategy is shown in Figure 4. The capital works described above will be supported by ongoing strategic planning including review of demographic and water cycle projections, water supply and sewerage system modelling, drinking water management, recycled water management and review of best-practice planning documents. This review of Council’s IWCM Strategy has confirmed that the existing strategic direction is appropriate and should continue to be implemented as the preferred IWCM scenario. Updated capital works programs and operating budgets to continue this implementation are provided as part of this review. Financial analysis has confirmed that the proposed strategy is affordable and requires no significant increases in customer bills. The adopted levels of service (for drought security, drinking water quality, water supply, sewer overflows, STP licence compliance and availability of service) will all be met by the preferred IWCM scenario.
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