#TITLE_ALTERNATIVE#

• Main Author: FAJAR FIRDAUS (nim:15308020), MUHAMMAD
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29189
• Institution: Institut Teknologi Bandung

<p align="justify">Floods caused by overflowing of the river downstream Cisangkuy cause large losses include loss of physical and non-physical. Cisangkuy River Downstream overflowing caused by the river no longer able to accommodate the flood discharge. This paper discusses the analysis of the existing conditions section Cisangkuy river downstream with discharge plan (20 year return period) using HEC-RAS software. This research using HEC-RAS ranging from artificial modeling Cisangkuy River downstream until flow simulation model. Based on simulation results steady flow analysis using the flood discharge plan period of 20 years (229,27 m3/s) that all the section was flooded and did not comply freeboard criteria (0.75 meters). The highest floods are on station 17.4, reaching 3.06 meters while the lowest was at station flood 0 is equal to 0.03 meters. The flood was caused by high sediment that reaches three meters along the river which makes a small cross-section capacity. So it can be concluded that the river downstream Cisangkuy require flood mitigation efforts in particular by normalizing cross the river. And then normalization planning Cisangkuy River Downstream along the 6.674 km (Sta 0 - Sta 33) with a single trapezoidal sectional shape, slope channel walls 1,5 and channel depth 7 meters at all off section while the size width is varies adjusted previous section. Based on the simulation results of a new section (design) that all section is able to accommodate Q20thn flood discharge plans and freeboard criteria (0.75 meters). The average height difference (elevation cliffs - water level) of all section is 1.94 meter with lowest height difference was at station 26 is 0.89 meters.<p align="justify">