Water Modelling-Modelled Data-Annual Permitted Take (APT)-Peel

Annual permitted take (APT) is a critical component of sustainable resource management, balancing the need for water resource utilisation with the preservation of ecosystems. It is a crucial mechanism for ensuring the long-term annual sustainable diversion limits (SDLs) set under the Murray-Darling Basin Plan are not exceeded, and that enough water is available for the environment. APT is the maximum amount of water permitted to be taken for consumptive purposes each year, and has been enforced since July 2019\r\n\r\nA method for determining APT is part of each water resource plans (WRPs) developed by the Basin states under the Commonwealth Water Act 2007. When the method is applied over the Basin Plan reference period (1895–2009), the annual APT must be equal to or less than SDL.\r\n\r\nAn APT model is a major component of the APT calculation method. It is used to calculate the APT that would be expected in a year, given that year’s water availability and climatic conditions. APT is calculated at the end of each year and compared to actual take in that year, with the difference added to a public register of take. SDL compliance is tracked using the cumulative difference (from water year 2019–20).\r\n\r\nAPT models are configured using estimates of the river management and development (public and private infrastructure) conditions in a river system across the water resource plan period. These estimates include:\r\n\r\n• irrigated crop area and planting decisions\r\n\r\n• water entitlement holders’ distribution and use patterns\r\n\r\n• how storages are operated to supply water for consumption and the environment.

年度许可取水量（Annual Permitted Take, APT）是可持续资源管理的核心组成部分，需在水资源利用需求与生态系统保护之间达成平衡。它是确保不超出《墨累-达令流域计划》规定的年度长期可持续分流限额（Sustainable Diversion Limits, SDLs）、并为生态环境预留充足水量的关键机制。APT指每年可被许可用于耗水用途的最大取水量，该制度自2019年7月起正式实施。

确定APT的方法是流域各州依据《2007年联邦水资源法》制定的各项水资源规划（Water Resource Plans, WRPs）的核心内容之一。当该方法应用于流域计划参考时段（1895–2009年）时，年度APT不得高于SDLs。

APT模型是APT计算方法的核心组成部分，用于根据某一年的水资源可获取量与气候条件，测算该年度的预期APT。APT于每年年末完成核算，并与当年实际取水量进行比对，二者差值将被纳入公共取水量登记册。自2019–2020水文年起，通过累计差值即可追踪SDLs合规情况。

APT模型需依据水资源规划时段内河流系统的河流管理与开发（公共与私人基础设施）状况的估算值进行配置，此类估算值包括：
• 灌溉作物种植面积与种植决策
• 水权持有者的配水与用水模式
• 蓄水设施如何调配水量以满足耗水用途与生态环境需求。