We have recently added the Water Modelling-Modelled Long Term Average Annual Extraction Limit dataset to SEED.

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This dataset is important as the amount of water that can be extracted from any surface water source is limited, and while the amount extracted by all water users varies each year, on average it cannot exceed the extraction limits. We then use this information in our NSW Water…

This dataset is important as the amount of water that can be extracted from any surface water source is limited, and while the amount extracted by all water users varies each year, on average it cannot exceed the extraction limits. We then use this information in our NSW Water Sharing Plans which all include these long-term average annual extraction limits (LTAAEL). In the Murray Darling Basin, Water Sharing Plans will also include the relevant Sustainable Diversion Limit as set by the Basin Plan. (There is more information on how these two limits work on our DPE Water website.)

The long-term average annual extraction limit (LTAAEL) is a regulatory limit set on the annual water extractions from a river system. It ensures that average extractions over the long term are sustainable, and therefore helps prevent environmental degradation.

Compliance is important, and to assess it, we model LTAAEL using a model that has been configured to represent the development and management rules defined by a system WSP. We then compare this modelled LTAAEL with the model under current conditions Long-Term Average Annual Extractions (which are usually those modelled by the Annual Permitted Take model). Although, the LTAAEL includes multiple types of water use, the compliance assessment is based on the total. We do this annually using the best available models, and the outcomes are published on the DCCEEW (previously DPE) website.

The data set provided contains flows at several gauges in each river system, as simulated by the annually extended LTAAEL model. Notwithstanding the model’s inherent limitations, these are a fair representation of those we would expect under Water Sharing Plan operation and development conditions. They can be compared with flows simulated by other key scenario models, such as the annual permitted take (APT) model or the Without Development model (a type of model where developments such as dams, irrigation and town water use i.e. human use, are removed).

Datasets have been broken down into the following valleys:

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Jane

22 Nov 2023

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Keywords

allocations and availability

compliance

surface water

water sharing plan

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Jane

Water Hub Admin

27 Nov 2023

The Water Modelling-Modelled Data-Long-term average annual extraction limit (LTAAEL) for the Peel has now been published. The Peel River is part of the Namoi catchment. The river flows through Tamworth, and its own catchment is about 4,700 km2. The Chaffey Dam, with a 62,000 megalitre capacity

The Water Modelling-Modelled Data-Long-term average annual extraction limit (LTAAEL) for the Peel has now been published.

The Peel River is part of the Namoi catchment. The river flows through Tamworth, and its own catchment is about 4,700 km2. The Chaffey Dam, with a 62,000 megalitre capacity, regulates the flow of the Peel River. The dam is located approximately 25 km southeast of Tamworth and augments the town water supply.

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Overview

Long-term average annual extraction limit (LTAAEL) is a regulatory limit set on annual water extractions from a river system. It ensures that average extractions over the long term are sustainable, and thus help prevent environmental degradation. In NSW these limits are defined by water sharing plans (WSPs). Every WSP outlines how the water in a river system will be shared over a 10-year period. They also define: • how LTAAEL compliance is to be assessed for each river system • what conditions will trigger noncompliance action • what compliance action can be taken. The Natural Resources Commission regularly reviews all WSPs to ensure extractions from each river system are within the limits set, and the Murray-Darling Basin Authority reviews sustainable diversion limit (SDL) compliance each year. To assess compliance, we model LTAAEL using a model that has been configured to represent the development and management rules defined by a system WSP (this refers to as LTAAEL model). We then compare this modelled LTAAEL with the modelled under current conditions long-term average annual extractions (LTAAEs) (which are usually those modelled by the annual permitted take, or APT, model). Although, the LTAAEL includes multiple types of water use, the compliance assessment is based on the total. We do this annually using the best available models, and the outcomes are published on the DPE website. Where river system’s LTAAE exceed LTAAEL, the system is considered noncompliant. If the noncompliance trigger conditions in the WSP are met, noncompliance action is taken. The data set provided contains flows at several gauges in each river system, as simulated by the annually extended LTAAEL model. Notwithstanding the model’s inherent limitations, these are a fair representation of those we would expect under WSP operation and development conditions. They can be compared with flows simulated by other key scenario models, such as annual permitted take (APT) model or without development (WOD) model.

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