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Pengendalian Limpasan Air Hujan di Rusun Mahasiswa Kampus 2 Politeknik PU Semarang Wildan Herwindo; Ingerawi Sekaring Bumi; Suhardi Suhardi; Syamsul Bahri; Andi Patiroi
Jurnal Konstruksi Vol 21 No 1 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-1.1302

Abstract

Flood events around the world tend to increase. Based on data from BNPB, floods in Indonesia are one of the disasters with the highest incidence. Flood disasters often occur in big cities in Indonesia such as Jakarta, Bandung, Samarinda and Semarang. Polytechnic of Public Works is a campus located in Semarang City and is a flood-prone area because it is situated on a lowland. Efforts are made to control rain runoff to reduce the potential for flooding on the PU Polytechnic campus. This study aims to determine the effectiveness of controlling rainwater runoff through the construction of infiltration wells in the student flats (flats) on campus 2 of the Public Works Polytechnic. The research was carried out by analyzing runoff discharge in the flat area and testing the soil permeability in that area. The research was conducted using quantitative methods using primary and secondary data. Primary data was obtained from soil permeability measurements while secondary data used included rainfall data, drainage master plans and Digital Elevation Model (DEMNAS) maps. Based on the research, the results obtained from measuring the permeability value of the soil in the PU Polytechnic flats area have a value of 0.029-1.680 cm/hour, which is included in low permeability. The results of soil permeability and geoelectrical tests showed that the soil conditions at the study site were water-saturated soils, making it difficult to absorb water into the soil. Analysis of the capacity of infiltration wells using a minimum permeability value of 0.029 cm/hour required 38,217 infiltration wells, while calculations with a maximum permeability value of 1.680 cm/hour required 660 infiltration wells. The number of needs for infiltration wells can be reduced by taking into account the volume of storage and the pattern of operation of the reservoirs in the student flat area of Campus 2 of the Public Works Polytechnic. The condition of the research location which is relatively saturated with water and has low permeability makes it difficult for water to absorb, so it is necessary to carry out further research to find other alternatives that are more suitable to be applied to that area.
SOSIALISASI PENGELOLAAN BANJIR BANDANG BERBASIS MASYARAKAT DALAM MITIGASI BENCANA DI KABUPATEN CILACAP Wildan Herwindo; Ingerawi Sekaring Bumi; Wahyu Prasetyo; Syamsul Bahri; Tia Hetwisari
Aptekmas Jurnal Pengabdian pada Masyarakat Vol 6 No 2 (2023): Aptekmas Volume 6 Nomor 2 2023
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36257/apts.v6i2.6550

Abstract

Limbangan Village is located at the Wanareja District, Cilacap Regency, Central Java. It is one of the areas prone to flash floods. Based on data, flash floods were recorded on 27 October 2021 which were caused by the overflow of the Cigeugeumeuh River and resulted in hundreds of houses and markets being damaged. Therefore, to reduce losses due to disasters that occur, especially flash floods in Limbangan Village, mitigation efforts are carried out in the form of socialization of community-based management of flash floods. Efforts to carry out community-based flood management in Cilacap Regency, were carried out through collaboration between the Public Works Polytechnic and Limbangan Village. The socialization of flood management in Limbangan Village uses concept of participatory rural community social approach or Participatory Rural Appraisal (PRA). At the end, community service activities in Cilacap Regency by the Public Works Polytechnic, Semarang have been successfully held. The results achieved in the implementation of this community service are the provision of information on rainfall that has the potential to cause flash floods, the learning process of disaster mitigation as a preparedness measure for flash floods, flood-prone and evacuation maps, and communication tools as a continuation of the community service program.
ANALISIS RESAPAN LIMPASAN AIR HUJAN DALAM RANGKA PENERAPAN ZERO DELTA Q DI POLITEKNIK PU Wildan Herwindo; Ingerawi Sekaring Bumi
JURNAL TEKNIK HIDRAULIK Vol 14, No 2 (2023): JURNAL TEKNIK HIDRAULIK
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v14i2.743

Abstract

ABSTRACT Implementation of zero delta Q located at Polytechnic of Public Works specifically at Student Apartment is conducted by infiltrating runoff into the ground. The objectives of this study are to analyze runoff volume based on rainfall-runoff analysis and the quantity of water that can be absorbed based on soil permeability. The methods used were 1-dimensional (1-D) and 2-dimensional (2-D) of geoelectric tests. Soil permeability tests was added to and calculate the capacity of the infiltration wells. The research analysis was done using primary data including the measurement result of topography, geo-electric, soil permeability, and water quality , as well as secondary data of rainfall data for 10 years from 2011-2020, DEMNAS, geological map, groundwater basin, aquifer productivity, and a tower development master plan. The results of 1-D and 2-D geoelectrical analysis showed that the soil conditions in the study area were saturated and it was difficult to absorb water into the soil, and the permeability test showed a low value of soil permeability. Based on the calculation of infiltration well capacity, 554 infiltration wells are required to absorb the runoff, but it is difficult to carry out due to the limitation of available land area.  Therefore, zero delta Q must be applied through other efforts, for instance by implementing reuse mechanism of runoff. Based on the analysis, the reuse of runoff can fulfill the water needs of 288 people. However, the reuse of runoff at the research location requires prior processing so it is suitable for water quality standards.Keywords:       zero delta Q, geoelectric test, infiltration, runoff, permeability ABSTRAKSalah satu upaya penerapan zero delta Q di Kampus Politeknik PU tepatnya rusun mahasiswa dilakukan dengan peresapan air limpasan hujan ke dalam tanah. Tujuan penelitian ini yaitu menganalisis volume limpasan berdasarkan analisis curah hujan-limpasan dan kuantitas air yang dapat diresapkan berdasarkan permeabilitas tanah. Metode yang digunakan adalah uji geolistrik 1 dimensi (1-D) dan 2 dimensi (2-D). Uji permeabilitas tanah diterapkan untuk menghitung kapasitas sumur resapan. Analisis penelitian dilakukan dengan data primer berupa hasil pengukuran topografi, geolistrik, permeabilitas tanah, dan kualitas air, serta data sekunder berupa data hujan yang diperoleh dari stasiun hujan BMKG Semarang, stasiun hujan Bandara Ahmad Yani, dan stasiun hujan Maritim Tanjung Mas selama 10 tahun dari tahun 2011-2020, data DEMNAS, peta geologi, data cekungan air tanah, data produktivitas akuifer, dan master plan pembangunan rusun. Hasil analisis dengan geolistrik 1-D dan 2-D menunjukkan kondisi tanah di lokasi penelitian jenuh air dan sulit untuk meresapkan air ke dalam tanah, di samping itu pengujian dengan permeabilitas menunjukkan nilai permeabilitas tanah rendah. Berdasarkan perhitungan kapasitas sumur resapan, diperlukan sebanyak 554 buah sumur resapan untuk meresapkan limpasan yang terjadi, kondisi ini sulit dilakukan karena keterbatasan lahan. Oleh karena itu penerapan zero delta Q perlu dilakukan melalui upaya lain misalnya dengan penggunaan kembali limpasan air hujan. Berdasarkan analisis, penggunaan kembali limpasan air hujan dapat memenuhi kebutuhan air untuk 288 orang, namun penggunaan kembali limpasan air hujan di lokasi penelitian memerlukan pengolahan terlebih dahulu agar memiliki kualitas air yang sesuai baku mutu air kelas 4 PP nomor 22 tahun 2021.Kata Kunci:           zero delta Q, uji geolistrik, resapan, limpasan, permeabilitas