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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Effect of minimum inter event time on water quality capture volume
Effect of minimum inter event time on water quality capture volume
Author : MAZLINA ALANG OTHMAN (1), AMINUDDIN AB. GHANI (1), KENG YUEN FOO1 (2) & CHUN KIAT CHANG (1)
ABSTRACT
In Malaysia, with lands and spaces becomes limited caused by urbanization, size of stormwater facilities should be
effective to meet the needs of planning, designing and managing stormwater systems. Water quality captured volume
(WQCV) has been practiced to give a balance between the storage size and water quality treatment effectiveness. WQCV
is a concept to relate the urban runoff volume with the local rainfall pattern, and the focus of the WQCV is to capture the
specified runoff volume of a storm event. 75th to 95th percentile runoff volume was used in WQCV estimation from
historical rainfall series analysis. As a smaller event dominate long term rainfall records and this event did not produce
runoff, it will affect the WQCV estimation. Independent rainfall event need to identify from rainfall series and separation of
rainfall event depends on time chosen in minimum inter event time (MIT). MIT is a minimum dry period between two
rainfall pulses and increasing of MIT will increase the rainfall depth of an event. This paper aims to study about the effects
of different MIT in WQCV estimation. Historical rainfall data from a selected rainfall station in Malaysia was analyzed with
different MIT at 2hr, 4hr, 6hr, 12hr, 18hr and 24hr. As it is more accurate to use shorter interval, 10 min interval of rainfall
record was used to separate rainfall event. The relation between MIT and rainfall depth with different percentile was
analyzed and their rainfall characteristic was assessed. This relation study has improved the accuracy of the design of
stormwater quality control facilities especially in Malaysia.
File Size : 245,620 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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