Georges River Flood Data

This report details the flood gauging operations undertaken\r\nfrom 1700 hrs on March 21st, 1983 to 0200 hrs on March 22nd,\r\n1983 and presents previous flood data collected on the\r\nGeorges River.\r\n\r\nThe Georges River has a total catchment area of\r\napproximately 650 square kilometres and flows into the\r\nsouth-western corner of Botany Bay about 15km south of\r\nSydney. The tidal influence under low freshwater discharge\r\nconditions extends approximately 40km upstream and\r\nterminates at Liverpool Weir.\r\n\r\nFlood monitoring at selected sites as defined in Figure 1 is\r\nundertaken for floods in excess of a one in ten year\r\nfrequency. Flood monitoring is commenced on receipt of\r\nConfidential/Preliminary Flood Warning advice when it is\r\npredicted that a stage level of 2.0 meters at the Liverpool\r\nWeir gauge (approximately 4.7m AHD) will be exceeded.\r\n\r\nThe collection of this flood data has in the past and will\r\nin the future be used to calibrate physical modeIs which are\r\nconstructed at the PWD Manly Hydraulics Laboratory and\r\nU.N.S.W. Water Research Laboratory.\r\n\r\nThe current metering- lines, flood gauge location and\r\nautomatic recorder locations are as follows:\r\n\r\ni) Current metering/flood level observations:\r\n\r\n1. East Hills Footbridge\r\n2. Milperra Road Bridge\r\n3. Rabaul Road (gauge readings only)\r\n4. Lansdowne Bridge - Prospect Creek\r\n5. Irelands Bridge - Cabramatta Creek\r\n6. Mountbatten Bridge - Warwick Farm\r\n\r\nii) Automatic recorders are located:\r\n\r\n1. Milperra Bridge (see note below)\r\n2. Lansdowne Bridge\r\n3. Cutler Road, Lansvale\r\n4. Scrivener Street, Warwick Farm\r\n5. Liverpool weir (upstream)\r\n\r\nNote on Milperra - The Milperra automatic recorder is located\r\nimmediately upstream of the road bridge. It\r\nconsisted of two measurement points, however only\r\nthe downstream one was operating at the time of\r\nthe monitoring. The recorder has since been modified and now has only one measurement point.\r\n\r\n本报告详述了1983年3月21日17时至1983年3月22日02时开展的洪水监测作业，并收录了此前采集的乔治河（Georges River）洪水数据。 乔治河总集水面积约650平方千米，于悉尼以南约15千米处注入植物学湾（Botany Bay）西南隅。在低淡水径流条件下，其潮汐影响范围向上游延伸约40千米，终止于利物浦堰（Liverpool Weir）。 针对重现期超过十年一遇的洪水，本报告将对图1划定的选定监测点位开展洪水监测。当预测利物浦堰监测站的水位将超过2.0米（约4.7米AHD）时，将在收到《机密/初步洪水预警》通知后启动监测工作。 过往及未来采集的此类洪水数据，将用于校准由PWD曼利水力实验室与新南威尔士大学（U.N.S.W.）水利研究实验室构建的物理模型。 当前的测流线路、洪水监测站点位及自动记录仪布设点位如下： （一）现行测流/洪水水位观测点位： 1. 东山希尔步行桥（East Hills Footbridge） 2. 米尔佩拉路大桥（Milperra Road Bridge） 3. 拉包尔路（仅提供监测读数） 4. 兰斯当大桥——普罗斯佩克特溪（Prospect Creek） 5. 爱尔兰大桥——卡布拉马塔溪（Cabramatta Creek） 6. 蒙巴顿大桥——沃里克农场（Warwick Farm） （二）自动记录仪布设点位： 1. 米尔佩拉大桥（详见下文说明） 2. 兰斯当大桥 3. 兰斯维尔卡特勒路 4. 沃里克农场斯克里夫纳街 5. 利物浦堰（上游侧） 米尔佩拉点位说明：该自动记录仪布设于该公路桥的正上游侧，原设有2个测量测点，但本次监测期间仅下游测点处于运行状态。后续该记录仪已完成改造，目前仅保留1个测量测点。