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Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP) >
BVAAP Vol.20 [2012] >
BVAAP Vol.20(1) [June 2012] >
| Title: | Comparison of flood for various return periods estimated using L-moments & other conventional techniques |
| Authors: | Kumar, Rakesh
Sapra, Tilak Raj
Mani, Pankaj
Patra, Jagdish
Arora, M |
| Issue Date: | Jun-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Information on flood magnitudes and their frequencies
is needed for design of various types of water resources projects/ hydraulic
structures such as dams, spillways, road and railway bridges, culverts, urban
drainage systems as well as for taking up various non-structural measures such
as flood plain zoning, economic evaluation of flood protection projects etc.
Since scientific hydrology began in the seventeenth century, one of the most
difficult problems facing engineers and hydrologists is how to predict flow in
basins with no records. Whenever rainfall or river flow records are not
available at or near the site of interest, it is difficult for hydrologists or
engineers to derive reliable design flood estimates directly. In such a
situation, regional flood frequency relationships developed for the region are
one of the alternative methods for prediction of design floods, especially for
small to medium size catchments. Considering the importance of prediction in
ungauged catchments, the International Association of Hydrological Sciences
(IAHS) launched "Prediction of Ungauged Basins (PUBs)" as one of its
initiatives and declared the current decade as "Decade of PUBs". As
per the Bureau of Indian Standards (BIS) hydrologic design criteria, frequency
based floods find their applications in estimation of design floods for almost
all the types of hydraulic structures viz. small size dams, barrages, weirs,
road and railway bridges, cross drainage structures, flood control structures
etc., excluding large and intermediate size dams. For design of large and
intermediate size dams probable maximum flood and standard project flood are
adopted, respectively. Most of the small size catchments are ungauged or
sparsely gauged. To overcome the problems of prediction of floods of various
return periods for ungauged and sparsely gauged catchments, a robust procedure
of regional flood frequency estimation is required to be developed. In this
study, floods of various return periods have been estimated using L-moments,
least squares based EVI distribution and PT III distribution methods for a snow
and rainfed area. Result obtained from the analyses of
the various approaches have been compared. |
| Page(s): | 106-110 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-2412 (Online); 0771-7706 (Print) |
| Source: | BVAAP Vol.20(1) [June 2012]
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