|Statement||Hydrologic Services Division, Cooperations Studies Section ; in cooperation with Corps of Engineers, U.S. Army and U.S. Department of Agriculture, Soil Conservation Service.|
|Series||Technical paper -- no. 25, Technical paper (United States. Weather Bureau) -- no. 25.|
|Contributions||United States. Hydrologic Services Division., United States. Army. Corps of Engineers.|
|The Physical Object|
|Pagination||vi, 53 p. :|
|Number of Pages||53|
Development of Intensity Duration Frequency (IDF) Curves. Rainfall data (cm of rain) were compiled over several years by determining the maximum amount of rainfall that occurred in a given time period during each given year. Use the rainfall data to develop IDF cures for 5 . Get this from a library! Rainfall intensity, duration, frequency curves and maps for Nigeria. [Lekan Oyebande]. Curves PF estimates with confidence intervals ; The precipitation frequency estimates were derived from annual maximum series at each station in the region (as described in documentation). Results are provided for min, hr, 2-day, and day durations and for annual exceedance probabilities of 1/2 (or 1-in-2), 1/5, 1/10, 1/25, 1/ The intensity-duration-frequency curves are used in hydrology to express in a synthetic way, fixed a return period T and a duration d of a rainfall event, and for a given location, the information on the maximum rainfall height h and the maximum rainfall intensity i. Known these parameters, it is possible to build synthetic rain graphs that are Cited by:
Results showed intensity-duration-frequency curves (I-D-F) for those return periods, as well as I-D-F equations: i =Tr 0,(t + 30) −0,89, where i was the intensity, Tr was the rainfall return periods and t was the rainfall. The rainfall data are presented using the intensity-duration-frequency curves that were derived from the point rainfall frequency analysis and the possible occurrence of flash floods in the different areas is discussed. It is concluded that the four regions have similar . Intensity-duration-frequency (IDF) curves, or tables, are perhaps the most commonly used method for presentation of the characteristics of extreme rainfall events. Intensity-Duration-Frequency curves/ Return Period Intensity Duration Frequency curves IDF التعامل مع GIS HU 3, views. Frequency Of Rainfall and Probability.
(Rashid et al, ) P_t=P_24 (t/24)^(1/3) () where, Pt is the required rainfall depth in mm at t-hr duration, P24 is the daily rainfall in mm and t is the duration of rainfall for which the. The total size of the design events (the rainfall depths) should be identical to the GEV analysis sizes in Figure 7. A common way to create a design event is from intensity-duration-frequency curves, or IDF curves. A few such curves exit for the region, but mainly for the northern part of the Caribbean. Rainfall intensity, duration, frequency curves and maps for Nigeria (Occasional paper) [Lekan Oyebande] on *FREE* shipping on qualifying offers. Risk Management Tools for Extreme Rainfall Events: Outline of Workshop • Extreme rainfall risks (i.e.