Abstract
Estimation of design flood is imperative for hydraulic designs of spillways and various other water resources development projects as well as very essential for flood risk assessment. The objective of the present study is to apply Geographical Information System (GIS) supported hydro informatics approach for estimation of design flash-flood in Bargi dam cross-section. A criterion used for estimation of design flash flood is validated by central water commission (CWC). A hydrologic modelling software (HEC-GeoHMS) is used for the delineation of basin characterises for simulation of the precipitation-runoff process of the dendritic basin system. The SUH (Synthetic Unit Hydrograph) and flood hydrographs for 25, 50 and 100 year return periods are computed along with time distribution curve which can be used to derive the time distribution co-efficient of storm rainfall in the sub-basins for the rainstorm of any duration. It is observed in this research that the peak characteristics of the design flash-flood are more perceptive to the various design storm pattern. It is demonstrated that flood hydrographs are important in flood-risk management. The results attained exhibit the capability of the flood hydrograph to describe the effects of different hydraulic systems.
Highlights
The study related to the safety of a structure in flash flood event is very crucial and need to be carried out at regular intervals
The basin area up to the Bargi dam is divided into five subbasin and synthetic unit hydrographs for each sub-basins are derived from the basin characteristics estimated using Arc Geographical Information System (GIS) and Arc Hydro tools
Width of unit hydrograph measured at discharge ordinates equal to 50% of Qp in hours (W50)
Summary
The study related to the safety of a structure in flash flood event is very crucial and need to be carried out at regular intervals. A most important parameter is the peak flood for better assessment of flood-related studies. Design flood studies are used to assess maximum flood that a hydraulic structure can bear. Giuliano et al, 2009 explained various methods such as empirical method, hydrograph technique, rational method, and flood frequency analysis to compute peak flood. The frequency analysis method is generally incorporated to calculate flood for a specific return period. In the case of inadequacy of primary data, frequency analysis recorded storm data is made and the storm of a particular frequency is applied to unit hydrograph for deriving design flood (Rowe et al 2018). India is divided into 7 zones and 26 hydro-meteorological homogeneous sub-zones by Indian Meteorological
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