Probable maximum flood for Googong dam.

By:

Australia. Hydrology and Water Resources Unit

Material type: Text

TextLanguage: ENG Publication details: JUL 1987Description: 55p., 21 refs, 16 figsReport number: HWR-86/10Subject: This report describes the methodology used to determine the Probable Maximum Flood (PMF) for the Googong Dam with its present spillway configuration. The spillway was designed in 1976 for an inflow PMF of 4,500 cumecs and an outflow PMF of 4,300 cumecs. Due to major revisions in the methods used to determine the Probable Maximum Precipitation (PMP) and the now widespread use of nonlinear rainfall-runoff models, a review of the PMF was required to check the existing spillway capacity. The outflow PMF for the existing Googong Dam spillway is estimated as 9,500 cumecs generated by a six hour duration thunderstorm. The corresponding inflow is 10,300 cumecs. The inflow PMF is estimated to be 11,600 cumecs generated by a three hour duration thunderstorm with the corresponding outflow for the existing spillway being 8,100 cumecs. The PMF has been assigned an Annual Exceedance Probability (AEP) of 1 in 10

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Books	Australian Emergency Management Library	BOOK	627.883 PRO (Browse shelf(Opens below))	Available		005258266

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Previous	627.82 CON ANCOLD Conference on Dams : conference papers : Queensland, 22-26 August /	627.883 EXI Existing Googong spillway - design flood hydrology.	627.883 GOO Googong dam safety review: hydrology for spillway options 1, 2 and 3.	627.883 PRO Probable maximum flood for Googong dam.	627.89447 LES Dam failure mechanisms and selection of modes and conditions of breaching.	627.8945 INV Inventory of potentially hazardous dams.	627.98021 WOA WOAD statistical report 1996 : statistics on accidents to offshore units engaged in oil and gas activities worldwide in the period 1970-95.	Next

1987 revision

This report describes the methodology used to determine the Probable Maximum Flood (PMF) for the Googong Dam with its present spillway configuration. The spillway was designed in 1976 for an inflow PMF of 4,500 cumecs and an outflow PMF of 4,300 cumecs. Due to major revisions in the methods used to determine the Probable Maximum Precipitation (PMP) and the now widespread use of nonlinear rainfall-runoff models, a review of the PMF was required to check the existing spillway capacity. The outflow PMF for the existing Googong Dam spillway is estimated as 9,500 cumecs generated by a six hour duration thunderstorm. The corresponding inflow is 10,300 cumecs. The inflow PMF is estimated to be 11,600 cumecs generated by a three hour duration thunderstorm with the corresponding outflow for the existing spillway being 8,100 cumecs. The PMF has been assigned an Annual Exceedance Probability (AEP) of 1 in 10

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