Design Flood Estimation of Swarnamukhi Barrage in Nellore District, Andhra Pradesh, India
P. SAHITHI *
Department of Soil and Water Conservation Engineering. Dr. NTR CAE, Bapatla, India.
MV.RAMANA
Department of Irrigation and Drainage Engineering, SV Agricultural College, Tirupathi, India.
CH. MURALI KRISHNA
Department of Agricultural Engineering, SV Agricultural College, Tirupathi, India.
RAMANA MURTHY
Department of Statistics and Computer Applications, SV Agricultural College, Tirupathi, India.
*Author to whom correspondence should be addressed.
Abstract
This study focuses on the re-estimation of the design flood value for the Swarna Mukhi Barrage-cum-Bridge, located near Vakadu in the SPSR Nellore district (Latitude 14° 0' 25" N, Longitude 80° 4' 11" E). The reassessment aims to enhance structural resilience and inform effective water management and flood preparedness strategies. Design storm analysis was conducted using the Hydrologic Engineering Center’s Statistical Software Package (HEC-SSP). Estimated flood discharge for 100 years return period were compared with the existing design flood capacity to evaluate its adequacy. Design storm value of 100 years T was 35.97cm. Base width of the flood hydrograph was 45 hours. Peak value of flood hydrograph obtained as 100 years T was 7451 cumecs. Based on IS specification (11223-1985), structure qualifies for 100 Year T. The estimated flood value 100 Year T was 7451 m3/sec whereas designed flood value of Swarna Mukhi barrage was 6450 m3/sec with a difference of 1001 m3/sec suggesting the provision of additional spillway for the structure to contain the flood and to ensure safety of the barrage.
Keywords: Design flood estimation, Swarna Mukhi Barrage, flood discharge, 100-year return period, HEC-SSP, Flood hydrograph