The Without Development Model is a hydrological model of a river system without any representation of water infrastructure (e.g. storages, weirs), water extraction, water management and operating rules in the system. It includes runoff for headwater catchments, local runoff of residual catchments, flow routing along river reaches, and transmissions losses. The Without development model is derived from the full model of the system, which is calibrated using observed data. Note: Source software (available from ewater.org.au) is required to view and run the model(s) within.

A without development model scenario is created by starting with a current conditions model scenario and switching off as much development in the model as possible. Typically this means removing all water users such as irrigation and towns along with infrastructure such as dams and weirs. A without development scenario is useful in understanding the extent to which human uses of the river have altered flows. This type of model scenario is sometimes known and a “natural case” but this terminology has fallen out of favour over time as a true natural condition scenario would attempt to reflect catchment conditions such as land use, vegetation cover and so on that existed prior to human interventions.

To construct a high-level evaluation scenario for the Water Sharing Plan (the Plan) for the Macquarie and Cudgegong Regulated River Water Source all account-based Plan Environmental Water (PEW) rules and Held Environmental Water (HEW) licences have been removed from the Current Conditions model. Specifically, it included the following PEW rules stipulated in Section 14 of the Plan: Environmental Water Allowance for Cudgegong The Macquarie Translucent sub-allowance Macquarie Active sub allowance The flow at the following key sites within the river system has been considered in the evaluation analysis (with data provided for an extended range of sites): 1) 421019_Cudgegong@YambleBridge 2) 421001_Macquarie@Dubbo 3) 421004_Macquarie@WarrenWeir 4) 421012_Macquarie@Carinda 5) Combination of 421088_MareboneBreak and 421090_Macquarie@DSMareboneWeir 6) 421146_Gum Cowal @ B/Cation 7) 421022_Macquarie@OxleyStation 8) 421090_Macquarie@DSMareboneWeir Note: If you would like to ask a question, make any suggestions, or tell us how you are using this dataset, please visit the NSW Water Hub which has an online forum you can join.

Water sharing plans (WSP) are established under the Water Management Act 2000 (the Act) and are prepared for all water sources in NSW. These plans are also a component of Water Resources Plans prepared as a requirement of the Basin Plan 2012, covering water sources in the Murray–Darling Basin. WSP’s are reviewed and replaced periodically (usually every ten years) to ensure the long-term health of ecosystems and communities in specific WSP areas. The review of a WSP includes a formal evaluation to assess appropriateness, efficiency of implementation, effectiveness in meeting plan objectives, and alignment with the Act's requirements. The evaluation follows a step-by-step process which includes a model scenario to represent the effects of Planned Environmental Water (PEW) rules in the WSP. This high-level (“No PEW”) scenario enables a comparison of modelled flows at key locations within the river system between scenarios WITH and WITHOUT plan environmental rules to inform an assessment of the effectiveness of the PEW rules in the WSP. Note: If you would like to ask a question, make any suggestions, or tell us how you are using this dataset, please visit the NSW Water Hub which has an online forum you can join.

The key objective of this Flood Study is to develop a suitable hydrologic/hydraulic model that can project flood and permanent inundation water levels in Lake Macquarie from rainfall, sea level rise and storm surge. These results will be used by Lake Macquarie City Council, in consultation with the community of Lake Macquarie City, to manage flood and permanent inundation risks to low lying land around the Lake Macquarie waterway. The key stages in the process are: Undertaken a comprehensive review of the 1998 Lake Macquarie Flood Study (Part 1 – Reference 1) and develop suitable hydrologic/hydraulic models to define flood behaviour over the full range of design events for existing catchment conditions, Use the hydrologic/hydraulic models to assess various climate change scenarios, including application of the NSW Government’s sea level rise benchmarks, Assess the potential increase in storm surge as a result of climate change and its impact on elevated ocean levels, Review the potential impact of climate change on the local wind/wave climate as this affects the extent of wave runup on the foreshore, Assess the hydraulic and hazard categories for existing and climate change conditions. This report details the results and findings of the above investigations. The key elements include: a summary of available historical flood related data, establishment of the hydrologic and hydraulic models, calibration of the hydrologic and hydraulic models, definition of the design flood behaviour for existing catchment conditions, sensitivity analysis of the design flood behaviour, assessment of the impacts of climate change on the still water and wave runup water levels re-definition of the flood extent and hydraulic and hazard categories mapping for existing and climate change conditions. A Flood Study is a technical document and not easily understood by the general public. A glossary of flood related terms is provided in Appendix A to assist. If more explanation of terms or a better understanding of the approach is required, type “NSW Government Floodplain Development Manual” into an internet search engine and you will be directed to the NSW Government web site which provides a copy of this manual and further explanation. Flood levels given in this report relate only to the water level with the lake itself. Design water levels in the creek systems entering the lake (Cockle Creek, Dora Creek etc.) will be higher than those shown for the lake.

Time series of modelled daily flow rates in megalitres per day across the NSW river systems – Border Rivers Valley. Individual for each available river gauge data sets are attained via best available at the time of publishing hydrologic model/s and over the historic climate period (usually from early to mid-1890s to a water year previous to the date of publishing). Specific scenario data sets are expected to be updated annually and subject to quality requirements may be used in relevant studies. The naming structure of the individual files is "Gauge number_watercourse@Gauge name".

To construct a high-level evaluation scenario for the Water Sharing Plan (the Plan) for the Gwydir Regulated River Water Source all account-based Plan Environmental Water (PEW) rules have been removed from the Current Conditions model. Specifically, it included the following PEW rules: Environmental Water Allowance (EWA) stipulated in Cause 64 of the Plan Protection of the minimum (3T) inflow rule stipulated in Clause 61 of the Plan 50:50 sharing of Supplementary water events stipulated in Clause 48 of the Plan The flow at the following key sites within the river system has been considered in the evaluation analysis: 1) 416052_GilGil@Galloway 2) 418001_Gwydir@Pallamallawa 3) 418002_ Mehi@Moree 4) 418004_Gwydir@Yarraman 5) 418013_Gwydir@Gravesend 6) 418037_Mehi@DSCombadello 7) 418048_Moomin@Combadello 8) 418049_Mallowa@Regulator 9) 418052_Carole@Garah 10) 418055_Mehi@Collarenebri 11) 418063_Gwydir@DSTyreel 12) 418066_Gwydir@Millewa 13) 418074_Gingham@Teralba 14) 418076_Gingham@Tillaloo 15) 418078_Gwydir@Allambie 16) 418079_Gingham@GinghamBridge Note: If you would like to ask a question, make any suggestions, or tell us how you are using this dataset, please visit the NSW Water Hub which has an online forum you can join.

The datasets provided contain modelled daily streamflow, and storage volume data for several NSW river systems. These data were generated by simulating baseline river system models used to inform the development of Regional Water Strategies. The models were simulated for three different climate scenarios: instrumental climate (about 130 years), paleo-stochastic climate (about 10,000 years), and paleo-stochastic climate with climate projection based on NARCliM 1.0 (about 10,000 years). Each modelled output is published as a ZIP file which contains two pdf files (.pdf) and three time series data (.csv). Note: To access and download datasets for specific regions, such as the Lachlan river system, please navigate to the respective child assets beneath this parent asset. For more information on the NSW regional water strategies program, please refer to the following website. https://www.dpie.nsw.gov.au/water/our-work/plans-and-strategies/regional-water-strategies Note: If you would like to ask a question, make any suggestions, or tell us how you are using this dataset, please visit the NSW Water Hub which has an online forum you can join.

The datasets provided contain modelled daily streamflow, and storage volume data for several NSW river systems. These data were generated by simulating baseline river system models used to inform the development of Regional Water Strategies. The models were simulated for three different climate scenarios: instrumental climate (about 130 years), paleo-stochastic climate (about 10,000 years), and paleo-stochastic climate with climate projection based on NARCliM 1.0 (about 10,000 years). Each modelled output is published as a ZIP file which contains two pdf files (.pdf) and three time series data (.csv). For more information on the NSW regional water strategies program, please refer to the following website. https://www.dpie.nsw.gov.au/water/our-work/plans-and-strategies/regional-water-strategies The naming structure of the individual zip files is "Watercourse at Gauge name, followed by Gauge number". 1) Towamba River at New Buildings Bridge Gauge 220001_NARCliM 2) Rutherford Creek at Brown Mountain Gauge 219001_NARCliM 3) Bemboka River at Morans Crossing Gauge 219003_NARCliM 4) Georges Creek at Steeple Flat (Cochrane Dam) Gauge 219005_NARCliM 5) Tantawangalo Creek at Tantawangalo Mountain Gauge 219006_NARCliM 6) Nunnock River at Brown Mountain (Dam Site) Gauge 219008_NARCliM 7) Brogo River at North Brogo Gauge 219013_NARCliM 8) Double Creek near Brogo Gauge 219017_NARCliM 9) Sandy Creek at Mogilla Gauge 219020_NARCliM 10) Bemboka River at Bemboka Gauge 219021_NARCliM 11) Tantawangalo Creek at Candelo Dam Site Gauge 219022_NARCliM 12) Brogo River at Angledale Gauge 219025_NARCliM 13) Bega River at Warraguburra Gauge 219026_NARCliM 14) Brogo River at Brogo Dam (Storage) Gauge 219027_NARCliM 15) Bega River at Kanoona Gauge 219032_NARCliM 16) Candelo Creek at Greenmount Road (Yurammie No. 4) Gauge 219034_NARCliM Note: If you would like to ask a question, make any suggestions, or tell us how you are using this dataset, please visit the NSW Water Hub which has an online forum you can join.

The datasets provided contain modelled daily streamflow, and storage volume data for several NSW river systems. These data were generated by simulating baseline river system models used to inform the development of Regional Water Strategies. The models were simulated for three different climate scenarios: instrumental climate (about 130 years), paleo-stochastic climate (about 10,000 years), and paleo-stochastic climate with climate projection based on NARCliM 1.0 (about 10,000 years). Each modelled output is published as a ZIP file which contains two pdf files (.pdf) and three time series data (.csv). For more information on the NSW regional water strategies program, please refer to the following website. https://www.dpie.nsw.gov.au/water/our-work/plans-and-strategies/regional-water-strategies The naming structure of the individual zip files is "Watercourse at Gauge name, followed by Gauge number". 1) Bellinger River at Thora Gauge 205002_NARCliM.zip 2) Bellinger River at Boggy Creek Gauge 205005_NARCliM.zip 3) Woolgoolga Creek at Woolgoolga Gauge 205007_NARCliM.zip 4) Corindi Creek at Upper Corindi Gauge 205012_NARCliM.zip 5) Kalang River at Kooroowi_Scotchman No3_Gauge 205013_NARCliM.zip 6) Bellinger River at Fosters Gauge 205016_NARCliM.zip Note: If you would like to ask a question, make any suggestions, or tell us how you are using this dataset, please visit the NSW Water Hub which has an online forum you can join.