Flood Frequency Analysis of Main Nara Valley

This paper deals with the flood of 2007 and its frequency analysis at MNY (Main Nara Valley), and generally describe flood of 2010 in Sindh Pakistan. Heavy monsoon rain and cyclones cause the flood conditions in Sindh. The damages happened to the infrastructure of the MNVD from RD (Reduced Distance) 0-100 and the ecological impacts of the flood on the local region of Taluka Johi, District Dadu. For flood risk assessment and its description, knowledge of extreme flood events and their return periods is important. This is achieved by regional flood frequency analysis, which deals with using flood information from different sites within a hydrologically homogeneous region. At the study area and its surroundings, information of previous 12 peak floods of 50 years have been collected and analyzed for flood frequency analysis. The Gumble\'s flood frequency and analytical methods have been used for obtaining the flood frequency. Generally, flood threat to this area is mainly from Nai Gaj River and rarely from flash floods from Balouchistan. The disastrous flood of 2007 and 2010 were the examples of the heavy floods in the last 50 years history at the study area. Analysis results suggest constructing small reservoirs in order to permanently solve the flood problems and to use the stored water for agricultural and other needs.