Wianamatta South Creek Cumulative Impact Assessment Rev E

In recognition of the significant development pressures in the Wianamatta South Creek catchment, this Cumulative Impact Assessment was commissioned to inform Infrastructure NSW, NSW Department of Planning and Environment – Environment and Heritage Group and Councils within the Catchment (Camden, Blacktown Liverpool and Penrith) of the flood constraints that could impact on development within the South Creek catchment. The assessment uses the adopted hydrologic and hydraulic models for the catchment from ‘Wianamatta South Creek Catchment Flood Study – Existing Conditions’ (Revision I, Advisian 2022) to define contemporary flood characteristics and to test a range of development and floodplain modification scenarios.\r\n\r\nThe assessment:\r\n- highlights the critical importance of maintaining areas of flow conveyance and flood storage. \r\n- developed mapping of the areas critical to the conveyance of floods that should not be disturbed or too heavily vegetated \r\n- provides a list of recommendations that are considered essential for mitigating the cumulative impacts of potential future development in the Wianamatta South Creek Catchment

鉴于怀亚纳马塔南溪流域（Wianamatta South Creek catchment）面临显著的开发压力，本累积影响评估（Cumulative Impact Assessment）受委托开展，旨在向新南威尔士州基础设施局、新南威尔士州规划与环境部环境与遗产组，以及该流域内的卡姆登、布莱克敦、利物浦与彭里斯地方议会，通报可能对南溪流域内开发活动造成影响的洪水约束条件。

本评估采用《怀亚纳马塔南溪流域洪水研究——现状条件》（修订版I，Advisian 2022）中针对该流域的已采用水文与水动力模型，以明确当代洪水特征，并测试一系列开发与洪泛区改造情景。

本评估成果包括：
- 明确维持输水通道与洪水蓄滞区的极端重要性；
- 绘制了洪水输水关键区域的分布图，此类区域不得受到扰动或植被过度覆盖；
- 列出了一系列必要建议，以缓解怀亚纳马塔南溪流域未来潜在开发活动带来的累积影响。