Open AccessSimulation of Rainfall-runoff process using HEC-HMS model for Garang Watershed, Semarang, Indonesia
Author(s) -
Anik Sarminingsih,
Arya Rezagama,
_ Ridwan
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1217/1/012134
Subject(s) - surface runoff , watershed , environmental science , hydrology (agriculture) , runoff curve number , hydrological modelling , hec hms , water resources , computer science , climatology , geology , ecology , geotechnical engineering , machine learning , biology
Discharge data is one of the important data in evaluating the reliability of water resources management in the watershed. Most watersheds in Indonesia do not have observed discharge data over a long period. While the availability of rainfall data is almost available in all watersheds with a much longer period. Therefore, it is necessary to convert rain into a runoff to obtain a discharge event with a long period. Rain-runoff transformation is a very complex process. Rain input contains the variability of space, time and uncertainty. A very complex hydrological analysis is needed to find out various parameters related to rain models for a runoff. One of the hydrological models that can be used is HEC-HMS 4.2. This paper aims to analyze the relationship of rainfall - runoff in the Garang watershed using HEC-HMS 4.2. For calibration, observational discharge data is used from AWLR Kreo. Based on optimization analysis, the hydrological parameter are obtained CN composite 66.4, groundwater content 128.48 mm, Initial Abstraction 25.7 mm and imperviousness 9.27%. The validity of the model is quite satisfactory, judging from the correlation values, RMSE and Nash.