Drainage Analysis of Pondok Jati Housing and Drainage Replanning

International Journal on Advanced Technology, Engineering, and Information System https://ojs.transpublika.com/index.php/IJATEIS Online ISSN 2828-5425 Drainage Analysis of Pondok Jati Housing and Drainage Replanning Hasan Alif Fathurokman1*, Esti Wulandari2, Laksono Djoko Nugroho3 Original Article https://doi.org/10.55047/ijateis.v4i1.1558 1-3Departement of Master Civil Engineer, Faculty of Engineer, Universitas 17 Agustus 1945 Surabaya, Surabaya, Indonesia Email: 1) , 2) , 3) Received : 23 December - 2024 Accepted : 20 January - 2025 Published online : 25 January - 2025 Abstract The Pondok Jati housing complex is less able to receive or accommodate rainwater discharge due to changes in channel dimensions, shallowing of channels, and dirt due to waste from people who do not care about the local environment. To anticipate this, it is necessary to repair and build infrastructure that functions as a flood controller according to the characteristics and conditions of the location. Efforts made for this are to redesign drainage at low cost. Hydrology and Hydraulics methods are applied to obtain a 5-year planned discharge and existing channel discharge, to plan channels with a 5-year planned return period. The existing channel discharge for the Pondok Jati housing complex is obtained as much as 0.450 m3/sec, and modeling is carried out in accordance with SNI 022406-1991: Procedures for general planning of urban drainage. With the redesign, the planned channel dimensions are obtained measuring 0.50 m x 0.75 m, in the form of a square without a cover. Keywords: Drainage, Hydrology, Replanning. 1. Introduction Water stored on the surface generally turns into runoff and much faster than groundwater, given the very low flow rate of the latter. In the rainy season, drainage in the Pondok Jati housing complex is less able to receive or accommodate rainwater discharge due to changes in channel dimensions, shallowing of channels, and dirt due to garbage from people who do not care about the local environment, causing the water to recede in the area for a very long time. According to Nugroho and Abduh (2023), to anticipate this, it is necessary to repair and build infrastructure that functions as a flood controller according to the characteristics and conditions of the location. Efforts made for this are to redesign drainage at low cost. A welldesigned drainage system prevents inundation, flooding, and other negative impacts on the environment and people's lives (Cahyono & Wjaya, 2024). In many areas, especially in rapidly developing urban areas, existing drainage systems are often inadequate to cope with increasing rainfall intensity, changing runoff patterns and the needs of the population. For example, research using the Storm Water Management Model (SWMM) in South Tangerang found that channel dimensions need to be redesigned to accommodate certain maximum discharge rates (Cahyono & Wjaya, 2024). In addition, urbanization exacerbates the performance of drainage systems, as seen in a study in Macaé, Brazil, where land use change led to increased flood risk and decreased channel capacity (de Souza & Junior, 2023). Evaluation of the existing channels also shows Copyright: © 2024 by the authors. This is an open access article distributed under the terms and conditions of the CC BY 4.0. 1 Hasan Alif Fathurokman et al. | Volume 1 No. 1 2025 that most of the drainage systems are not able to accommodate the volume of water during heavy rainfall, so that re-planning strategies are needed, such as the implementation of retention ponds and improvement of channel dimensions (Juliastuti et al., 2023). On the other hand, the implementation of Sustainable Urban Drainage Systems (SUDS) is gaining ground in many countries to recycle stormwater, reduce environmental impacts, and improve urban sustainability (Vilariño et al., 2015). However, drainage planning challenges are growing due to the effects of climate change induced extreme rainfall and uncontrolled urbanization, requiring adaptive and sustainable solutions in the design and re-planning of drainage systems (Zhang et al., 2014). This is relevant in the case of Pondok Jati Housing, where drainage system analysis and re-planning is needed to mitigate flood risk and create a safer and more comfortable environment for the community. 2. Literature Review 2.1. General Planning Procedures for Urban Drainage Urban drainage planning needs to pay attention to the function of urban drainage as a city infrastructure based on the concept of environmentally conscious development (Yazdanfar & Sharma, 2015). This concept is related to efforts to conserve water resources, which in principle is to control rainwater so that more of it is absorbed into the ground and not wasted as surface flow (Kinkade-Levario, 2007), including by creating artificial infiltration structures, tendon ponds, landscaping and terraces (Indonesia, 1991). The stages of urban drainage planning include: 1) The stages are carried out by making a master plan, feasibility study and detailed planning, with the following explanation: - a feasibility study can be made as a continuation of the creation of a master plan; - detailed planning needs to be done before urban drainage construction work is carried out; 2) Urban drainage in cities and large towns needs to be planned comprehensively through the master plan stage.; 3) Urban drainage in medium and small cities can be planned through the framework planning stage as a replacement for the master plan.; 4) Urban drainage in medium-sized cities that have rapid physical growth and population growth as well as urban drainage that has complex problems due to local natural conditions, requires comprehensive planning through the master plan stage.; 5) Urban drainage should be planned with various alternatives, and the selection of the best alternative is carried out through a review process that takes into account technical, socioeconomic, financial and environmental aspects.; 6) Surveys conducted in the context of urban drainage planning include location, topography, hydrology, geotechnics, land use, socio-economics, institutions or institutions, community participation, population, environment and financing.; 7) Investigations carried out in the context of urban drainage planning are further details of survey work to obtain design parameters.; 8) Urban drainage design should be based on hydrological, hydraulic, structural and cost considerations.; 9) Land preparation for urban drainage construction to be carried out in accordance with applicable laws and regulations; 2 Hasan Alif Fathurokman et al. | Volume 1 No. 1 2025 10) Implementation of urban drainage must be carried out in accordance with commonly used construction regulations and approved by the authorized agency; 11) Operation and maintenance of urban drainage in order to comply with the regulations commonly used and approved by the authorized agencies. 2.2. 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