POTENTIAL IMPLEMENTATION OF SUSTAINABLE DRAINAGE SYSTEM AS A FLOOD MITIGATION EFFORT IN URBAN DENSE POPULATION, CIBADAK VILLAGE, BANDUNG CITY

• Main Author: Aliyya Melita, Nafisa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61984
• Institution: Institut Teknologi Bandung

Bandung is a metropolitan city with high level of urbanization rate. According to data from the Badan Pusat Statistik Kota Bandung (2018), from 2014 to 2018 there’s an increase of population at Bandung, with a population growth rate reaching 0.50% in 2014. People who in live in densely populated area have a high vulnerability to disasters, one of which is flood disaster. Sustainable Drainage Systems (SuDS) is one of the Nature-Based Solutions initiated by IUCN as an answer to solving surface water problems with a sustainable manner and different from conventional practices. The Study was being conducted in Cibadak Village, Astanaanyar District, Bandung city in May-August 2021. This study aims to identify te potential application of the SuDS concept in densely populated area in Cibadak Village. Identification of flood characteristics, identification of the suitability of the application of SuDS, and formulation of the design of the SuDS application in Cibadak Village are regarded as specific targets for the study. Two qualitative methods were used, namely data collection and data processing. It was found that flood in Cibadak Village only occurred in RWs that were passed by the Citepus River (RW01, RW02, RW 03, RW 06, RW 07, RW 08) with the causes of the flood are silting of the river due to garbage and household waste, conversion of infiltration area into houses, and flood-garbage that were being sent from upstream. The inundation area reached 0.3km², the puddle height was 40cm-2m, and its duration was 1-5hours, it occurred 6 times a year during rainy season. Rainfall in Cibadak Village included in the normal category (103mm/year), with rainfall intensity of 109.49mm/hour in secondary drainage and 196.31mm/hour in tertiary drainage. The drainage systems are a mixture of natural drainage and artificial drainage, loctaed at ground level and a mixture of open and closed channels. By its usage, the drainage is multipurpose with it acts as a diverter of rainwater and greywater wasteway. The cross-sectional area of the drainega channel is 800cm² for secondary drainage and 450cm² for tertiary drainage with flow velocity of 0.4-0.6m/sec. it was found that Citepus River has a water level if 20-50cm during the dry season and 5 meters during the rainy season with the river’s water characteristics are cloudy, smelly with a garbage within it. The activities around the Citepus River are settlements with foundations built right above the river border. Land cover data also show the form of scattered buildings/buildings, courtyards, places of activity, vacant/barren land, and parking lots for motorized vehicles. The type of soil in Cibadak Village is Alluvial Soul with groundwater level of 55mbgl in the south to 75mbgl in the north. From these conditions, the suitable types of SuDS are Rainwater Harvesting System, Porous Paving Material, and Swales. The SuDS design was carried out in the RW06 and RW07 areas. The government’s role is needed in a forum that accomodates the socialization of the implementation of SuDS to mitigate flood disasters. Selection of the type of SuDS in accordance with land conditions and availability of funds. Collaboration between elements of community around Cibadak Village is also needed as a brainstorming platform in overcoming the flood problems.