Groundwater Zone of Impact for the Namoi subregion

## **Abstract** \n\nThis dataset was created within the Bioregional Assessment Programme. Data has not been derived from any source datasets. Metadata has been compiled by the Bioregional Assessment Programme.\n\n\n\nThe Zone of Impact (ZOI) is derived from the groundwater management units, mining development leases and/or coal seam gas (CSG) tenements, and directional flows of groundwater (Barrett et al., 2013). The process of defining the ZOI is undertaken via consideration of the vertical and horizontal proximity and scale of groundwater connectivity pathways and potential for depressurisation or dewatering.\n\n## **Purpose** \n\nThe purpose of the ZOI is to provide a first step in the process of determining whether a water-related link is possible between coal resource development and the assets. It is intended to be a realistic yet inclusive estimate of the land surface area where potential impacts might occur. As the model-data analysis, impact analysis and risk analysis components of a BA are completed it will be possible to more closely characterise and quantify impacts in terms of their extent and their likelihood.\n\n## **Dataset History** \n\nSchlumberger Scenario 3 with Santosh's buffer: GroundwaterZoneofImapctMaps_Schlumberger1.pdf\n\nDamian Barrett's polygon with justification: DamiansPolygon.pdf\n\nJim Kellet's Lower Namoi ZOI: Lower Namoi ZOI.pdf\n\n\n\nRationale:\n\n\n\nDevelopment (see GroundwaterZoneofImapctMaps_Schlumberger1.pdf): \n\nExpert opinion by Santosh Aryal (CSIRO). Schlumberger have prepared model scenarios and run their groundwater model. Scenario 3 is the most likely development scenario and is published in their 2012 groundwater model report which is archived at: http://archive.lls.nsw.gov.au/__data/assets/pdf_file/0006/526353/archive_NCWS_Phase-4-Final-report.pdf\n\n\n\nLower Namoi groundwater impacts (see Lower Namoi ZOI.pdf):\n\nExpert opinion by Jim Kellet (GA). For the Cainozoic sediments in the lower Namoi the impact boundary would extend across the entire area of occurrence of the Namoi alluvium defined by the Lower Namoi WSP boundary in Smithson (2009) whcih can be found at: http://www.water.nsw.gov.au/__data/assets/pdf_file/0009/548712/avail_ground_lower_namoi_report_2008.pdf. An ultra-conservative boundary would be the entire area between two dividing streamlines in the alluvium enveloping the Namoi alluvium, the southern one extending NW from the common corner of the Gilgandra and Walgett 1:250 000 sheets and the northern one approximately collinear with the northern WSP boundary. These same boundaries (the ultra-conservative ones) would also be an appropriate impact boundary for the underlying GAB sequence. The rationale behind the choice in both hydrogeological systems is that there is no groundwater flow radially outwards from these boundaries. The recommended ZOI boundary for the Lower Namoi is almost identical to the Lower Namoi alluvium defined in the Namoi Water Sharing Plan. The background heads are the watertable contours plotted on 1:250 000 maps and indicate some flow into the zone but no groundwater flow out of it. The no outflow condition is the rationale for choosing this particular boundary.\n\n\n\nExpert scientist view (DamiansPolygon.pdf)\n\nDamian Barrett (CSIRO). Keep lower Namoi alluvium as may be impacted. Stay west of Hunter-Mooki Fault - elsewhere use catchment boundaries.\n\n## **Dataset Citation** \n\nBioregional Assessment Programme (2013) Groundwater Zone of Impact for the Namoi subregion. Bioregional Assessment Source Dataset. Viewed 11 December 2018, http://data.bioregionalassessments.gov.au/dataset/51aed716-276b-477f-ba48-ff99ffce7c4e.

## 摘要

本数据集由生物区域评估计划（Bioregional Assessment Programme）编制，未从任何源数据集衍生而来，元数据由生物区域评估计划汇编。

影响区（Zone of Impact, ZOI）源自地下水管理单元、采矿开发租赁权及/或煤层气（coal seam gas, CSG）租赁权，以及地下水定向流动（Barrett等人，2013）。影响区的划定需综合考量地下水连通路径的垂直与水平邻近性、规模，以及降压或疏干的潜在可能性。

## 用途

影响区的设立旨在为判断煤炭资源开发与相关资产之间是否存在水相关关联提供第一步依据，其目标是对可能发生潜在影响的陆地区域作出兼具现实性与包容性的估算。待生物区域评估（Bioregional Assessment, BA）的模型数据分析、影响分析与风险分析环节完成后，便可基于影响的范围与可能性，对其进行更精准的特征刻画与量化。

## 数据集历史

含桑托什缓冲区的斯伦贝谢情景3：GroundwaterZoneofImapctMaps_Schlumberger1.pdf

附带论证依据的达米安·巴雷特多边形：DamiansPolygon.pdf

吉姆·凯莱特下纳莫伊影响区：Lower Namoi ZOI.pdf

### 论证依据

#### 开发方案（详见GroundwaterZoneofImapctMaps_Schlumberger1.pdf）

由桑托什·阿里亚尔（联邦科学与工业研究组织，CSIRO）提供专家意见。斯伦贝谢已编制模型情景并运行其地下水模型，情景3为最符合实际的开发情景，已收录于其2012年地下水模型报告，该报告存档于：http://archive.lls.nsw.gov.au/__data/assets/pdf_file/0006/526353/archive_NCWS_Phase-4-Final-report.pdf。

#### 下纳莫伊地下水影响（详见Lower Namoi ZOI.pdf）

由吉姆·凯莱特（澳大利亚地质调查局，GA）提供专家意见。针对下纳莫伊的新生代沉积物，影响边界应覆盖史密斯森（2009）定义的下纳莫伊水共享计划（Water Sharing Plan, WSP）边界所划定的整个纳莫伊冲积层分布区域，相关文档可查阅：http://www.water.nsw.gov.au/__data/assets/pdf_file/0009/548712/avail_ground_lower_namoi_report_2008.pdf。极端保守的边界可覆盖纳莫伊冲积层周边冲积层内两条分流流线之间的整片区域：南侧流线从吉尔格拉德拉与沃尔克特1:250 000地形图的公共角向西北延伸，北侧流线则大致与WSP北部边界共线。上述边界（即极端保守边界）同样适用于下伏的大自流盆地（Great Artesian Basin, GAB）地层。选择这两类水文地质系统边界的依据是：从这些边界向外不存在径向地下水流动。下纳莫伊地区推荐的影响区边界，与《纳莫伊水共享计划》中定义的下纳莫伊冲积层几乎完全一致。背景水头为1:250 000地形图上绘制的地下水位等高线，显示有水流流入该区域，但无地下水流出，无地下水流出的条件便是选择该边界的依据。

#### 专家科学家意见（DamiansPolygon.pdf）

达米安·巴雷特（联邦科学与工业研究组织，CSIRO）：保留可能受影响的下纳莫伊冲积层；在亨特-穆基断层以西区域维持原有划分，其余区域采用流域边界。

## 数据集引用

生物区域评估计划（2013）：纳莫伊次区域地下水影响区。生物区域评估源数据集。2018年12月11日查阅，http://data.bioregionalassessments.gov.au/dataset/51aed716-276b-477f-ba48-ff99ffce7c4e。