Channel Capacity Evaluation Model Using Storm Water Management Model

Yang Ratri Savitri (Institut Teknologi Sepuluh Nopember)
Satria Damarnegara (Institut Teknologi Sepuluh Nopember)
Mahendra Andiek Maulana (Institut Teknologi Sepuluh Nopember)
Umboro Lasminto (Institut Teknologi Sepuluh Nopember)
Novi Andriany Teguh (Institut Teknologi Sepuluh Nopember)
Nastasia Festy Margini (Institut Teknologi Sepuluh Nopember)

Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan
Vol 9 No 2 (2024): SEPTEMBER

Floods commonly occur in big cities with huge population densities. The increasing population number can cause a decrease in open land and green open space areas. It increases the surface runoff and induces inundation due to inadequate channel capacity. Therefore, a better design is required to minimize the inundation depth and area. This research aims to evaluate the drainage capacity of the channel dimension based on the flood discharge obtained from the rational method. The cross-section capacity was evaluated using the Storm Water Management Model by considering two types of rainfall distribution. The simulation result shows that the rainfall distribution influences the channel capacity. The flood discharge based on the Sri Harto distribution has a lower peak discharge than the Tadashi Tanimoto distribution. The result shows the significant effect of rainfall distribution types on the water depth. Therefore, it is necessary to determine the rainfall distribution method that represents the watershed characteristics used to design the drainage system.