Estimation of Probable Maximum Flood for a Water Resource Development Project in Upper Narmada Basin

Raksha Kapoor Mohit Kumar
Punjab Engineering College (Deemed to be University), Chandigarh 160 012, India , IN

Jagdish Patra
Punjab Engineering College (Deemed to be University), Chandigarh 160 012, India , IN

Keywords: Probable maximum flood (PMF), catchment characteristics, Unit hydrograph, hydrologic routing, HECHMS

Abstract

Estimation of probable maximum floods (PMF) is essential for design of spillways and various water resource development projects. Depending on various assumptions and approaches, resulting PMF estimates may vary differently. Recently, Probable Maximum Precipitation (PMP) Atlas of various basins of India has been prepared jointly by Central Water Commission and India Meteorological Department, Government of India. This paper uses the grid wise PMPs given in the Atlas to estimate PMF hydrograph of at project site in Narmada River. The catchment area is divided into four sub catchments and unit hydrographs for each sub catchment are derived from the physiographic characteristics. A hydrologic model is setup in HEC-HMS 3.5 for estimating flood hydrographs at outlet of each sub catchment and finally at the project site by hydrologic flood routing approach

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