Groundwater Management Unit - Secondary

Updated nightly. While this layer is a live layer and updated nightly, please note, once this data is downloaded it becomes static information. GMUs are generally mapped to follow surface water catchment boundaries and geological features (e.g., surface boundaries, fault lines). The region’s water demand distribution is also used to inform the size of the GMU, i.e., areas with higher water demand will be divided into smaller GMUs to more sustainably manage cumulative effects. Primary GMUs are identified across the whole region. Secondary (upper) GMUs are located above the Primary GMUs in a limited number of locations, based on the feasibility of productive groundwater bores being installed in both layers, current (or potential for) demand from both layers and the degree of hydraulic separation between the aquifers. The sustainable groundwater allocation availability is based on a simple water balance approach, guided by a conceptual understanding of regional hydrogeological and hydrological processes. A portion of the annual rainfall recharge to the groundwater system is set aside to maintain flows to springs and streams. The remaining groundwater volume was then allocated as 15% in coastal areas and 25% inland. The mass water balance for each groundwater catchment has been calculated by PDP. Details of the calculation methodology is provided in the report Groundwater Allocation Limits for the Bay of Plenty Region. ETL Name is ‘Groundwater Management Unit - Secondary’ and is set to run daily. Field descriptions Groundwater Unit Code: An identifying code for each groundwater management unit (GMU). Groundwater Management Unit: Spatial area which is assigned a common groundwater sustainable yield for the purpose of groundwater allocation accounting. Freshwater Management Unit: the freshwater management unit each GMU falls within. Available Allocation (Mm3/y): the amount of water available to be allocated in million cubic metres per year (Mm3/y). Allocated Groundwater (Mm3/y): that amount of water already allocated via consents in Mm3/y. Allocation Remaining (Mm3/y): the amount of water still available to be allocated. Allocation Remaining (Mm3/y) = Available Allocation (Mm3/y) - Allocated Groundwater (Mm3/y). Allocated Groundwater (%): the percentage of available allocation that has been allocated. Allocation Status: a description of the allocation status based on Allocated Ground

本数据集每日夜间更新。请注意：本图层为实时更新图层，每日夜间同步更新，但一旦下载后即变为静态数据。
地下水管理单元（Groundwater Management Unit, GMU）的制图通常遵循地表水集水区边界与地质特征（如地表边界、断层线）。该区域的需水分布同样用于确定GMU的划分范围：需水量更高的区域会被划分为更小的GMU，以更可持续地管控累积影响。
全区域已划定一级GMU。二级（上层）GMU仅在有限区域设置于一级GMU之上，划分依据包括两层含水层均可施工高产地下水钻孔的可行性、两层当前（或潜在）的需水情况，以及含水层间的水力分隔程度。
地下水可持续可分配水量基于简易水量平衡法，并以区域水文地质与水文过程的概念性认知为指导。每年降雨补给地下水系统的水量中，会预留一部分以维持泉眼与溪流的径流。剩余地下水量的分配比例为：沿海地区15%，内陆地区25%。
各地下水集水区的水量平衡计算由PDP完成，计算方法的详细说明详见《丰盛湾地区地下水分配限额》报告。
抽取-转换-加载（Extract, Transform, Load, ETL）任务名称为「地下水管理单元-二级」，设置为每日运行。
字段说明：
地下水单元编码（Groundwater Unit Code）：每个地下水管理单元（GMU）的唯一标识编码。
地下水管理单元（Groundwater Management Unit）：为实现地下水分配核算而划定的、统一设定地下水可持续开采量的空间区域。
淡水管理单元（Freshwater Management Unit）：每个GMU所属的淡水管理单元。
可分配水量（Available Allocation, Mm³/a）：以百万立方米每年（Mm³/a）为单位的可分配水量。
已分配地下水量（Allocated Groundwater, Mm³/a）：通过取水许可已分配的地下水量，单位为百万立方米每年。
剩余可分配水量（Allocation Remaining, Mm³/a）：当前仍可分配的地下水量，计算公式为：剩余可分配水量（Mm³/a）= 可分配水量（Mm³/a） - 已分配地下水量（Mm³/a）。
已分配水量占比（Allocated Groundwater, %）：已分配水量占总可分配水量的百分比。
分配状态（Allocation Status）：基于已分配水量得出的分配状态描述。