AWRA South West Coast Assessment 2010

This assessment and related data examines water resources in the South West Coast region in 2009–10 and over recent decades. Seasonal variability and trends in modelled water flows, stores and levels are considered at the regional level and also in more detail at sites for selected rivers. Information on water use is provided for selected urban centres and irrigation areas. It
begins with an overview of key data and information on water flows, stores and use in the region in recent times followed by a brief description of the region. Water quality, which is important in any water resources assessment, is not addressed. At the time of writing, suitable quality controlled and assured surface water quality data from the Australian Water Resources Information System (Bureau of Meteorology 2011a) were not available. Groundwater and water use are only partially addressed for the same reason. In future reports, these aspects will be dealt with more thoroughly as suitable data become operationally available.
Key data and information
The assessment presents the 2009–10 annual landscape water flows and the change in accessible surface water storage in the South West Coast region. The rainfall deficit that occurred  evapotranspiration total is higher than rainfall) resulted in a low regional average landscape water yield1  and also contributed to further decreases in soil moisture levels. In contrast, accessible surface water storage volumes in the major reservoirs of the region increased slightly, mainly due to the fact that many of these storages are located in catchments where streamflow was at an approximately average level for the year.

本评估及相关数据针对2009-2010年度及近数十年间西南海岸（South West Coast）区域的水资源展开研究。研究从区域尺度出发，针对模拟得到的水流、蓄水量及水位的季节变化与趋势展开分析，同时针对选定河流的监测点位开展更细致的剖析。本报告还提供了选定城市中心与灌溉区域的用水相关信息。

本评估开篇先概述了近期该区域水流、蓄水量及用水的核心数据与信息，随后对该区域进行简要介绍。尽管水质在任何水资源评估中均至关重要，但本报告未涉及水质相关内容。在本报告撰写之际，澳大利亚水资源信息系统（Australian Water Resources Information System，澳大利亚气象局[Bureau of Meteorology]，2011a）尚未提供经过质量管控与可信度验证的地表水水质合格数据。基于同样的原因，本报告仅部分涉及地下水与用水相关内容。待后续可获取符合业务要求的合格数据后，后续报告将对这些内容进行更全面的阐述。

核心数据与信息
本评估展示了西南海岸（South West Coast）区域2009-2010年度的年度陆地景观水流总量，以及可利用地表水蓄水量的变化情况。当年出现的降水赤字（实际蒸散发总量高于降水量）导致区域平均陆地景观产水量¹偏低，同时进一步加剧了土壤湿度的下降。与之形成对比的是，该区域主要水库的可利用地表水蓄水量略有上升，这主要是因为多数这类蓄水工程所在的流域当年的径流量基本处于平均水平。