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PENGARUH PERUBAHAN TUTUPAN LAHAN TERHADAP DEBIT BANJIR DI DAS WINONGO DAERAH ISTIMEWA YOGYAKARTA Pradipta Nandi Wardhana; Sri Amini Yuni Astuti; Dadang Kurnia
Jurnal Ilmiah Teknik Sipil Jurnal Ilmiah Teknik Sipil, Vol. 22, No. 2, Juli 2018
Publisher : Department of Civil Engineering, Udayana University

Konversi tutupan lahan dari tutupan yang bersifat permeabel menjadi tutupan yang bersifat impermeabel terjadi di DAS Winongo setiap tahun. Konversi tutupan lahan tersebut berpengaruh terhadap debit limpasan langsung yang jumlahnya bertambah, dan mereduksi jumlah air yang mengalami infiltrasi. Penelitian ini dilakukan untuk mengetahui pengaruh perubahan tata guna lahan di DAS Winongo terhadap debit limpasan pada tahun 2002, 2007, dan 2013. Perubahan tata guna lahan diidentifikasi melalui analisis spektral citra Landsat untuk memperoleh parameter curve number. Penelitian ini bertujuan menganalisis hidrograf satuan sintetis dan hujan efektif dengan menggunakan metode Soil Conservation Service (SCS). Hasil analisis frekuensi data hujan harian menyerupai distribusi Log Pearson dan selanjutnya hujan harian maksimum didistribusikan ke dalam bentuk hujan jam-jaman dengan menggunakan metode alternating block method (ABM). Hasil studi ini menunjukkan bahwa parameter curve number (CN) mengalami peningkatan dari tahun ke tahun walaupun perubahan yang terjadi tidak signifikan. Secara berturut-turut nilai curve number (CN) adalah 78,958, 79,075, and 79,431 untuk tahun 2002, 2007, dan 2013. Nilai parameter curve number CN 100 menyatakan bahwa seluruh hujan yang jatuh pada tutupan lahan tersebut akan menjadi limpasan langsung. Peningkatan nilai curve number tersebut menyebabkan meningkatnya debit banjir. Debit puncak pada tahun 2002, 2007, dan 2013 berturut-turut adalah 184,65 m3/detik, 185,84 m3/ detik, dan189,53 m3/ detik.

PERBANDINGAN PERANCANGAN SUMUR RESAPAN AIR HUJAN MENGGUNAKAN METODE SUNJOTO DAN SNI 03-2453-2002 PADA BANGUNAN KOMERSIAL DI JALAN KALIURANG KM 12 SLEMAN JOGJAKARTA Rifky Adhi Prasojo; Sri Amini Yuni Astuti
TEKNISIA Vol. XX, No. 2, November 2015
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Imbalance between suction and recharging of groundwater in Kampus Terpadu UII Yogyakarta triggers declined of free water level. The phenomenon can interfere ecosystem balance. Recharging wells are needed to maintain groundwater balance in the surrounding area of Kampus Terpadu UII.Infiltration data as primary data was obtained by using infiltrometer ring. Rainfall data as long as 10 years from narrow rainfall station was used to calculate 5-year return period of rainfall intensity. Both data was used to design recharging wall by using equation presented by Sunjoto method and SNI 03-2453-2002 method.The research results showed that the constant infiltration rate was 0,000017-0,000127 m/second. Circle recharging wells were selected for comparison of both methods effectiveness to collect rainfall run off. Diameter of recharging wall was 1 m, and well depth was 2,5 m. Analyses results showed that number of recharging well designed by using SNI 03-2453-2002 method was more than recharging well designed by using Sunjoto method. Utilization of recharging well can be used to maintain groundwater level. The recharging well can collect rainfall run off more than 98%.

STUDI GERUSAN DI HILIR BENDUNG KOLAM OLAK TIPE VLUGHTER DENGAN PERLINDUNGAN GROUNDSILL Adi Daning Pangestu; Sri Amini Yuni Astuti
TEKNISIA Vol. XXIII, No. 1, Mei 2018
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Weir is a river building designed to meet the needs of irrigation. River containment will result in considerable elevation differences between upstream and downstream weirs and result in hydraulic jumps. Hydraulic jumps that occur downstream of the weir will cause scouring downstream of the dam to damage the stability of the weir. So that in the planning of weir there is energy damper of stilling basin. Given the complexity and importance of the problems occurring downstream, the study of scouring downstream from weirs due to the influence of flow to river discharge needs to be given special attention, so that later it can be seen the scouring pattern and the scour depth that occurs. A study on scouring downstream of weirs was conducted in a laboratory with a weir model using a stilling basin vlughter type pond that flowed with three variations of discharge, testing each variation of the flow for 60 minutes. Then tested by giving protection at downstream weir using groundsill with distance Lmax and ½ Lmax. The experimental results show the greater the flow discharge the greater the scour depth and the flow characteristic values such as the Froude and Reynold numbers. The sediment transport balance was obtained during observation of scour depth at 50 minutes. With the protection of groundsill provide reduction of scour depth by 13.1579% at the groundsill of Lmax distance and 9.2105% at groundill distance of ½ Lmax.

PENGARUH FAKTOR GEOMETRIK SUMUR RESAPAN TERHADAP PERENCANAAN DIMENSI SUMUR RESAPAN DAN PENGURANGAN LIMPASAN PERMUKAAN Sri Amini Yuni Astuti
TEKNISIA Vol. XXVI, No. 1, Mei 2021
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol26.iss1.art2

To solve the problem of flooding, and to conserve groundwater, many infiltration wells have been built. To plan the dimensions and number of infiltration wells, that is influenced by the geometric factor of an infiltration well. Therefore, this paper will discuss the influence of infiltration well geometric factor on the dimensional planning and the number of infiltration wells needed, as well as those that are feasible to build based on existing land limitations. The planning of infiltration wells uses the Sunjoto method. The study location is on the UII integrated campus. Rainfall data were taken from Prumpung station in 1998 - 2016. The larger the infiltration well geometric factor, the smaller the number and dimensions of infiltration wells. For example, in the D3 Ekonomi complex, for a type of infiltration well with a diameter of 1,5 m and a height of 4 m, with , 8 units are needed, while an infiltration well with requires 7 units. Likewise for other complexes. With the limited land available, the greater the infiltration well geometric factor used, the reduction in surface runoff is not much change, almost the same, namely 59,73 % with and 59,79 % with F=7,4022 m.

ANALISIS KEANDALAN EMBUNG SELOPAMIORO DALAM MEMENUHI KEBUTUHAN AIR BAKU DAN IRIGASI DAERAH IMOGIRI BANTUL Agus Budi Satriyo; Sri Amini Yuni Astuti
TEKNISIA Vol 27 No 2 (2022): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol27.iss2.art5

Management of water sources in the Imogiri Region of Bantul Regency still needs to be improved. Although there are several springs in the area, water availability can still not meet the community’s water needs. Therefore, the solution needed is a problem solved to get a good water management system so that the wheels of life and the community’s economy can run well. One of them is to build a water reservoir as a small dam. With this Embung Selopamioro, it is hoped that the rainwater that falls in this region can be accommodated and used for community needs. The study was conducted with several analyses of the capacity of the small dam with three comparisons: analysis of water availability, analysis of water demand, and analysis of topographic characteristics. Small dam reliability is analyzed by simulating a reservoir water balance and the level of reservoir reliability in meeting the community’s water needs. The maximum capacity of the small dam is 9.317,72 m3, with a living storage capacity of 8.979,71 m3 and a dead storage capacity of 338,01 m3. The water requirement that can be met is the irrigation demand of 9,71 ha of rice field with 667.683,556 m3, and the raw water demand for 1.318 people is 24.465 m3. The level of small dam reliability for optimizing irrigation water demand with an area of 9,71 ha rice field and raw water demand with a population of 1.318 people has the lowest value of 51%.

Analisis Manajemen Risiko Konstruksi Pada Proyek Konstruksi Bendungan Berdasarkan Konsep ISO 31000:2018 Septianugraha, Agastya Fauzan; Fitri Nugraheni; Sri Amini Yuni Astuti
AGREGAT Vol 9 No 2 (2024): .
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v9i2.23808

Indonesia merupakan negara dengan penduduk terbanyak ke empat di dunia dan hal ini menjadi tantangan pemerintah dalam membangun infrastruktur yang memadai. Salah satu program pemerintah dalam pembangunan infrastruktur adalah program Proyek Strategis Nasional (PSN) yang tersebar di seluruh Indonesia yang salah satunya adalah proyek bendungan. Penelitian ini dilakukan di proyek Pembangunan Bendungan Bener di Kabupaten Purworejo pada pekerjaan Paket 3. Penelitian ini dilakukan dengan konsep ISO 31000:2018 yang mengidentifikasi risiko dari sudut pandang pengguna jasa (owner) dan penyedia jasa (kontraktor) berdasarkan kemungkinan kejadian risiko dan dampak risiko. Hasil identifikasi risiko akan divalidasi oleh masing-masing pihak dan akan dilakukan penilaian oleh responden yang terlibat langsung dengan pelaksanaan pekerjaan. Hasil penilaian risiko akan dianalisis menggunakan matriks risiko. Respon risiko dari masing-masing pihak akan dilakukan dengan wawancara berdasarkan tiap variabel risiko. 11 variabel risiko dari sudut pandang pengguna jasa (owner) dan 21 variabel risiko dari sudut pandang penyedia jasa (kontraktor). Hasil penilaian risiko dari pihak pengguna jasa didapatkan risiko dengan kategori high risk sebanyak 8 risiko, kategori medium risk sebanyak 3 risiko. Sedangkan pihak penyedia jasa didapatkan risiko dengan kategori high risk sebanyak 18 risiko, kategori medium risk sebanyak 2 risiko, kategori low risk sebanyak 1 risiko. Respon risiko berdasarkan hasil wawancara didapatkan sebanyak 3 risiko yaitu risk reduction, 1 risiko yaitu risk avoidance, 4 risiko yaitu risk transfer, 2 risiko yaitu risk avoidance-transfer, dan 1 risiko yaitu risk reduction-transfer. Kemudian untuk penyedia jasa adalah 6 risiko yaitu risk reduction, 7 risiko yaitu risk avoidance, 2 risiko yaitu risk transfer, 3 risiko yaitu risk retention, 2 risiko yaitu risk reduction-transfer, 1 risiko yaitu risk avoidance-transfer.

Performance of infiltration wells in commercial building along the Kaliurang Road, Yogyakarta, between km 12 – 13 in 2017 Sri Amini Yuni Astuti
Teknisia Vol 29 No 1 (2024): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol29.iss1.art5

Previous studies have shown that incorporating infiltration wells into drainage systems can significantly reduce surface runoff. However, the actual effectiveness of these wells in absorbing rainfall remains uncertain. This article evaluates the performance of infiltration wells installed at commercial buildings along Kaliurang Road (km 12–13) in 2017. Precipitation data was collected from the nearest weather stations: Kemput, Beran, and Bronggang. The design of the infiltration wells followed the Sunjoto technique, utilizing rainfall data from 2001 to 2020 to determine the rainfall intensity for a 5-year return period. To assess the wells' efficiency, daily rainfall data was converted to hourly data using Tadashi Tanimoto's method. The flow rate from rainfall on the roof was compared with the capacity of the infiltration wells. In 2017, the wells' capacity exceeded the flow rate on 363 out of 365 days, demonstrating an exceptionally high-performance rate of 99.45%. On September 28 and November 28, 2017, however, the wells were unable to handle the rainfall due to insufficient capacity.

Analisis Manajemen Risiko Konstruksi Pada Proyek Konstruksi Bendungan Berdasarkan Konsep ISO 31000:2018 Septianugraha, Agastya Fauzan; Fitri Nugraheni; Sri Amini Yuni Astuti
AGREGAT Vol 9 No 2 (2024): Vol. 9 No. 2 (2024)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v9i2.23808

Indonesia merupakan negara dengan penduduk terbanyak ke empat di dunia dan hal ini menjadi tantangan pemerintah dalam membangun infrastruktur yang memadai. Salah satu program pemerintah dalam pembangunan infrastruktur adalah program Proyek Strategis Nasional (PSN) yang tersebar di seluruh Indonesia yang salah satunya adalah proyek bendungan. Penelitian ini dilakukan di proyek Pembangunan Bendungan Bener di Kabupaten Purworejo pada pekerjaan Paket 3. Penelitian ini dilakukan dengan konsep ISO 31000:2018 yang mengidentifikasi risiko dari sudut pandang pengguna jasa (owner) dan penyedia jasa (kontraktor) berdasarkan kemungkinan kejadian risiko dan dampak risiko. Hasil identifikasi risiko akan divalidasi oleh masing-masing pihak dan akan dilakukan penilaian oleh responden yang terlibat langsung dengan pelaksanaan pekerjaan. Hasil penilaian risiko akan dianalisis menggunakan matriks risiko. Respon risiko dari masing-masing pihak akan dilakukan dengan wawancara berdasarkan tiap variabel risiko. 11 variabel risiko dari sudut pandang pengguna jasa (owner) dan 21 variabel risiko dari sudut pandang penyedia jasa (kontraktor). Hasil penilaian risiko dari pihak pengguna jasa didapatkan risiko dengan kategori high risk sebanyak 8 risiko, kategori medium risk sebanyak 3 risiko. Sedangkan pihak penyedia jasa didapatkan risiko dengan kategori high risk sebanyak 18 risiko, kategori medium risk sebanyak 2 risiko, kategori low risk sebanyak 1 risiko. Respon risiko berdasarkan hasil wawancara didapatkan sebanyak 3 risiko yaitu risk reduction, 1 risiko yaitu risk avoidance, 4 risiko yaitu risk transfer, 2 risiko yaitu risk avoidance-transfer, dan 1 risiko yaitu risk reduction-transfer. Kemudian untuk penyedia jasa adalah 6 risiko yaitu risk reduction, 7 risiko yaitu risk avoidance, 2 risiko yaitu risk transfer, 3 risiko yaitu risk retention, 2 risiko yaitu risk reduction-transfer, 1 risiko yaitu risk avoidance-transfer.

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