Precipitation Intensity-Duration-Frequency Functions for the Bannu Region NWFP Pakistan (RESEARCH NOTE)
author
Abstract:
The function of precipitation intensity-duration-frequency is needed for the planning and design of water resource projects. Short duration precipitation data are hardly available. However the total hourly-recorded available precipitation data for different parts of NWFP from different departments have been collected and analyzed for the present study. The data from WAPDA is found to be more authentic. Making use of the data, functions of intensity-duration-frequency for precipitation are developed for the Bannu region, representing the lower hilly and plane areas in NWFP. The IDF curves are plotted for 2, 5, 10, 25, 50 and 100-year return periods. The theoretical intensities of precipitation calculated by the developed functions are in close agreement with those recorded at the stations through automatic gages. Only 7 % variation is observed for most of the time. The values of the constants k, b and exponents n, m in the IDF function are calculated from the observed precipitation data. The correctness of the developed function is ascertained through its comparison with existing equations for depth duration developed for the world’s largest rainfall events. The function developed is found to produce more realistic results for regions in NWFP. The developed function may be used in the same region in a radius of about 100 km. For design practices regarding the prediction of precipitation in the future, instead of consulting 26 years of data available for the same region on hourly basis.
similar resources
Retinoblastoma in NWFP, Pakistan.
BACKGROUND Retinoblastoma is a malignant intraocular tumour of childhood, if not detected early, it results in loss of eye as well as life. The Objective was to study the pattern of presentation of Retinoblastoma in order to detect the disease at an earlier stage. It was conducted at Supra Regional Referral Centre for Retinoblastoma, Department of Ophthalmology, Khyber Teaching Hospital, Peshaw...
full textextracting the intensity - duration – frequency curves with daily precipitation data using fractal theory
the intensity – duration – frequency (idf) curves play most important role in the hydraulic design of structures. the traditional method to construct idf curves has a long estimation process and also has high number of parameters which this property reduces the reliability of idf curves. in the traditional method, rainfall in different durations should be available until the extraction of idf c...
full textNonstationary Precipitation Intensity-Duration-Frequency Curves for Infrastructure Design in a Changing Climate
Extreme climatic events are growing more severe and frequent, calling into question how prepared our infrastructure is to deal with these changes. Current infrastructure design is primarily based on precipitation Intensity-Duration-Frequency (IDF) curves with the so-called stationary assumption, meaning extremes will not vary significantly over time. However, climate change is expected to alter...
full textA Trust Region Algorithm for Solving Nonlinear Equations (RESEARCH NOTE)
This paper presents a practical and efficient method to solve large-scale nonlinear equations. The global convergence of this new trust region algorithm is verified. The algorithm is then used to solve the nonlinear equations arising in an Expanded Lagrangian Function (ELF). Numerical results for the implementation of some large-scale problems indicate that the algorithm is efficient for these ...
full textDerivation of Intensity -Duration-Frequency -Area(IDFA) Curves for Mashhad City
A knowledge of rainfall distribution over a finite area is needed for small bydraulic structures design. Hydrologists have always been concerned about Depth- Area- Duration (DAD) for a specific storm in a watershed. An intense storm occurred on June 6, 1992 which claimed some lives in parts of Mashhad, Khorasan Province, Iran. Data of rainfall depth at 29 raingauge stations around the city and ...
full textMy Resources
Journal title
volume 20 issue 1
pages 59- 63
publication date 2007-04-01
By following a journal you will be notified via email when a new issue of this journal is published.
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023