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Layer: Discharge 1430 Cumecs (26)

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Layer: Discharge 2330 Cumecs (28)

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Layer: Discharge 2910 Cumecs Protection (30)

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Layer: Discharge 3430 Cumecs (31)

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Layer: Discharge 4630 Cumecs (34)

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Description: Flood map boundary generated through ArcGIS's floodplain modeling using data generated by Steve Ratcliffe with BMT WBM and Hydro Consulting. February 2011.Tamar River Flood Water Surface Profiles for Multiple Discharge Emergency Management Flood Level MapGeneralThis map indicates water surface profiles from Hobblers Bridge Rd in the North Esk to down stream of Hunter Cut in the Tamar. The purpose of this map is to define an array of water surface profiles for emergency management purposes. Flood frequenciesNote: The AEP of 1:100 for example is the probability on the average that a given flood height will be equalled or exceeded in any year. A 1:100 AEP flood height has a 1% chance of being exceeded in any one year. ARI or Average Recurrence Interval is the average period between events of a nominated size.Annual Exceedance ProbabilityProbability of the design flow being equalled or exceeded at least once in a 20 Year Period50 Year Period1:2064%92%1:5033%64%1:10018%39%1:20010%22%The frequencies of flooding in the Tamar River system have been derived from data collected during the past 100 years in the South Esk. The extent of flooding shown on this map is approximate only.DischargesHydro Consulting where commission to review the South hydrology at Trevallyn. They recommended that the following flood estimates should be adopted. Flood Return Period in yearsSouth Esk Flood discharge values recommended by Hydro Consulting 2008 cumecs2018105023301002910200Monte Carlo Range1850 3430 39905004630The recommended median 1:200 year AEP flood discharge is therefore 3430 cumecs a reduction of 1270 cumecs (27%) on the estimate used in 1994. For any given AEP there are a range of flood discharges which are possible. A range of flood peak values was derived using a Monte Carlo analysis in which the following parameters were varied: The range in values due to the stochastic variability of initial losses and temporal patterns with constant continuing loss, gave 5thand 95thpercentile values of 1850 cumecs to 3990cumecs for the 200 year flood Where continuing loss was varied the 5thand 95thpercentile values were 1720 cumecs and 4130 cumecs.Flood SurfacesThe flood surfaces shown on the plan relate to the larger floods which will emanate from the South Esk. The levels in the North Esk are therefore largely due to backwater effects.The flood surfaces were modelled in TUFLOW by BTM WBM using a scoured bathymetry established with the Hydrodynamic model RMA10s.The production of the maps and associated hydraulic and hydrological studies were project managed by Steve Ratcliffe.This map is based on the following reports:River Tamar & North Esk River Flood Study, Final Report November 2008 by BMT WBMHydrodynamic Modelling of the Tamar Estuary December 2008 by BMT WBMTrevallyn Flood Frequency Review August 2008 by Hydro Consulting

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Layer: Discharge 419 Cumecs North Esk (35)

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Description: North Esk Flood Water Surface ProfilesforMultiple Discharges for use in Planning & Emergency ManagementGeneralThese maps indicate North Esk derived flood levels from the Black Bridge to Corra Linn. The maximum flood levels below Hobblers Bridge are determined by South Esk discharges into the Tamar which provide higher elevations than the North Esk discharges for the same Average Recurrence Interval (ARI).To predict flood levels in the lower North Esk with low South Esk discharge, the, please consult the LCC Flood Warning Manager. As the user travels up river the impact of the South Esk on the North Esk flood levels diminishes and effectively disappears at Norwood WWTP. DischargesHydro Consulting was commissioned to review the South Esk hydrology while the North Esk hydrology was derived by the University of New South Wales Water Research laboratory. The Table 1 indicates the results of latter study used in the construction of this map.Flood Return Period in Years ARINorth Esk Flood Discharges (UNSW WRL 2006)103452041950526100614200710500851Table 1The adopted tail-water level used in the analysis for this map was 2.1 m AHD at the junction with the Tamar for all discharges. This represents the highest astronomical tide at Launceston with average atmospheric pressure and neutral wind conditions. The North Esk model was successfully calibrated to the flood which occurred on 30thAugust 2005 which peaked at 470 cumecs and the flood which occurred on 21stJune 2011 at 251 cumecs.For other tail water conditions both lower and higher than 2.1 m AHD please consult Steve Ratcliffe the Flood Warning Manager.

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Layer: Discharge 526 Cumecs North Esk (36)

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Description: North Esk Flood Water Surface ProfilesforMultiple Discharges for use in Planning & Emergency ManagementGeneralThese maps indicate North Esk derived flood levels from the Black Bridge to Corra Linn. The maximum flood levels below Hobblers Bridge are determined by South Esk discharges into the Tamar which provide higher elevations than the North Esk discharges for the same Average Recurrence Interval (ARI).To predict flood levels in the lower North Esk with low South Esk discharge, the, please consult the LCC Flood Warning Manager. As the user travels up river the impact of the South Esk on the North Esk flood levels diminishes and effectively disappears at Norwood WWTP. DischargesHydro Consulting was commissioned to review the South Esk hydrology while the North Esk hydrology was derived by the University of New South Wales Water Research laboratory. The Table 1 indicates the results of latter study used in the construction of this map.Flood Return Period in Years ARINorth Esk Flood Discharges (UNSW WRL 2006)103452041950526100614200710500851Table 1The adopted tail-water level used in the analysis for this map was 2.1 m AHD at the junction with the Tamar for all discharges. This represents the highest astronomical tide at Launceston with average atmospheric pressure and neutral wind conditions. The North Esk model was successfully calibrated to the flood which occurred on 30thAugust 2005 which peaked at 470 cumecs and the flood which occurred on 21stJune 2011 at 251 cumecs.For other tail water conditions both lower and higher than 2.1 m AHD please consult Steve Ratcliffe the Flood Warning Manager.

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Layer: Discharge 614 Cumecs North Esk (37)

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Description: North Esk Flood Water Surface ProfilesforMultiple Discharges for use in Planning & Emergency ManagementGeneralThese maps indicate North Esk derived flood levels from the Black Bridge to Corra Linn. The maximum flood levels below Hobblers Bridge are determined by South Esk discharges into the Tamar which provide higher elevations than the North Esk discharges for the same Average Recurrence Interval (ARI).To predict flood levels in the lower North Esk with low South Esk discharge, the, please consult the LCC Flood Warning Manager. As the user travels up river the impact of the South Esk on the North Esk flood levels diminishes and effectively disappears at Norwood WWTP. DischargesHydro Consulting was commissioned to review the South Esk hydrology while the North Esk hydrology was derived by the University of New South Wales Water Research laboratory. The Table 1 indicates the results of latter study used in the construction of this map.Flood Return Period in Years ARINorth Esk Flood Discharges (UNSW WRL 2006)103452041950526100614200710500851Table 1The adopted tail-water level used in the analysis for this map was 2.1 m AHD at the junction with the Tamar for all discharges. This represents the highest astronomical tide at Launceston with average atmospheric pressure and neutral wind conditions. The North Esk model was successfully calibrated to the flood which occurred on 30thAugust 2005 which peaked at 470 cumecs and the flood which occurred on 21stJune 2011 at 251 cumecs.For other tail water conditions both lower and higher than 2.1 m AHD please consult Steve Ratcliffe the Flood Warning Manager.

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Description: North Esk Flood Water Surface ProfilesforMultiple Discharges for use in Planning & Emergency ManagementGeneralThese maps indicate North Esk derived flood levels from the Black Bridge to Corra Linn. The maximum flood levels below Hobblers Bridge are determined by South Esk discharges into the Tamar which provide higher elevations than the North Esk discharges for the same Average Recurrence Interval (ARI).To predict flood levels in the lower North Esk with low South Esk discharge, the, please consult the LCC Flood Warning Manager. As the user travels up river the impact of the South Esk on the North Esk flood levels diminishes and effectively disappears at Norwood WWTP. DischargesHydro Consulting was commissioned to review the South Esk hydrology while the North Esk hydrology was derived by the University of New South Wales Water Research laboratory. The Table 1 indicates the results of latter study used in the construction of this map.Flood Return Period in Years ARINorth Esk Flood Discharges (UNSW WRL 2006)103452041950526100614200710500851Table 1The adopted tail-water level used in the analysis for this map was 2.1 m AHD at the junction with the Tamar for all discharges. This represents the highest astronomical tide at Launceston with average atmospheric pressure and neutral wind conditions. The North Esk model was successfully calibrated to the flood which occurred on 30thAugust 2005 which peaked at 470 cumecs and the flood which occurred on 21stJune 2011 at 251 cumecs.For other tail water conditions both lower and higher than 2.1 m AHD please consult Steve Ratcliffe the Flood Warning Manager.

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Description: North Esk Flood Water Surface ProfilesforMultiple Discharges for use in Planning & Emergency ManagementGeneralThese maps indicate North Esk derived flood levels from the Black Bridge to Corra Linn. The maximum flood levels below Hobblers Bridge are determined by South Esk discharges into the Tamar which provide higher elevations than the North Esk discharges for the same Average Recurrence Interval (ARI).To predict flood levels in the lower North Esk with low South Esk discharge, the, please consult the LCC Flood Warning Manager. As the user travels up river the impact of the South Esk on the North Esk flood levels diminishes and effectively disappears at Norwood WWTP. DischargesHydro Consulting was commissioned to review the South Esk hydrology while the North Esk hydrology was derived by the University of New South Wales Water Research laboratory. The Table 1 indicates the results of latter study used in the construction of this map.Flood Return Period in Years ARINorth Esk Flood Discharges (UNSW WRL 2006)103452041950526100614200710500851Table 1The adopted tail-water level used in the analysis for this map was 2.1 m AHD at the junction with the Tamar for all discharges. This represents the highest astronomical tide at Launceston with average atmospheric pressure and neutral wind conditions. The North Esk model was successfully calibrated to the flood which occurred on 30thAugust 2005 which peaked at 470 cumecs and the flood which occurred on 21stJune 2011 at 251 cumecs.For other tail water conditions both lower and higher than 2.1 m AHD please consult Steve Ratcliffe the Flood Warning Manager.

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Description: Boundary extents of flood water from the North Esk River flood that peaked on 06/06/2016 at around 3:15pm AEST (800 Cumecs) and the flood boundary extents for the River Tamar from the South Esk River flood that peaked 36 hours later on 08/06/2016 at 3:20am RL3.25 AHD at Charles St Bridge (2248 cumecs). The extents were captured from a combination of ground survey of flood waters and debris lines, aerial oblique photography taken during the peak and UAV drone high resolution aerial survey in the days after the event mapping debris lines.

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• class ( type: esriFieldTypeString, alias: Class, length: 255 )
• descriptor ( type: esriFieldTypeString, alias: Descriptor, length: 255 )
• shape ( type: esriFieldTypeGeometry, alias: Shape )
• st_area(shape) ( type: esriFieldTypeDouble, alias: st_area(shape) )
• st_perimeter(shape) ( type: esriFieldTypeDouble, alias: st_perimeter(shape) )