Author(s): Salagegheh Ali; Abdollahi Hamid Reza
Linked Author(s):
Keywords: Flood; Catchment; Discharge; Hydrometery; Distribution
Abstract: In this study the Index Flood Method used for regional flood analysis in small catchments in north of Tehran Iran. At first, for this aim gathered maximum instantaneous and maximum daily discharge records and data from hydrometery stations that occurred in study area and determined index period for compeletion and reclamation of defective records by attention to length of record period (selected15 stations). Then achieved random-test maximum instantaneous discharge data series for total stations. In other stage for aim of prevaling distribution, functions of probable distribution matched with data series. Hemogenity-Test (or uniformity factor) achieved with maximum instantaneous discharge station data for regional analysis flood. In this test specified that flood data from 5 hydrometery stations are not hemogen with other stations and eliminated that to consisted of: Kamarkhani, Bagh Tangeh, Magasak, Oushan and Farahzad stations. Another stages of survey accomplished without these stations (5 mentioned) data. Then estimated northern parts of Tehran, flood in different areas downless from 200 km 2 by using results of regional flood analysis. At last, obtained one table which show the estimated discharge pay attention to area catchment and return period of case study.
Year: 2002