Analysis of Synthetic Unit Hydrograph Reability in Cikapundung Watershed, West Java Province, Indonesia

EasyChair Preprint 7245

Abstract

Synthetic unit hydrographs (SUH) that are most often used in Indonesia include SUH Nakayasu, SUH SCS, SUH Snyder and SUH ITB 1. Based on this background, a study was conducted to determine the most appropriate use of the SUH method for the characteristics of the Cikapundung watershed. Hydrograph calibration was carried out using hourly rainfall data and 24-hour observation discharge data. The results of the analysis show that the Snyder SUH method is the most effective to be applied to the Cikapundung watershed compared to the other three methods. This method shows a positive Nash-Sutcliffe efficiency (NSE) achieve of 0.74 with a correlation of 0.88. While the NSE value for SUH Nakayasu is -0.74 with a correlation of 0.93, the NSE value for SUH SCS is -1.61 with a correlation of 0.88 and the NSE value for SUH ITB-1 is -1.79 with a correlation of 0.87. Land cover in the Cikapundung watershed in 2020 is dominated by settlements with an area of 50.64 km2, so the runoff coefficient value is quite large with a value of 0.46. The flood discharges for return periods of 2, 5, 10, 25, 50 and 100 years using the SUH Snyder method are 112.59 m3/second, 137.65 m3/second, 159.77 m3/second, 194 ,16 m3/sec, 224.82 m3/sec and 260.20 m3/sec, respectively.

Keyphrases: Cikapundung Watershed, Flood Discharge, SUH Snyder, runoff coefficient

@booklet{EasyChair:7245,
  author    = {Abdul Chalid and Bagus Prasetya},
  title     = {Analysis of Synthetic Unit Hydrograph Reability in Cikapundung Watershed, West Java Province, Indonesia},
  howpublished = {EasyChair Preprint 7245},
  year      = {EasyChair, 2021}}