Tarakan City experiences problems with standing water during the rainy season, especially in the west Tarakan sub-district which is the center of Tarakan. This puddle not only submerged settlements and offices but also shops and access roads that caused considerable economic losses. An evaluation was carried out by using the Storm Water Management Model (SWMM). SWMM is a rainfall-runoff simulation model used for simulating the quantity and quality of surface runoff from urban areas. Based on the evaluation using SWMM software, the drainage system in Tarakan, especially in Jalan Mulwarman has several inundated channels, namely channels 2, 3, 4, 5, 6, 7, 11, 12, 13, 14. This is influenced by the dimensions of the drainage channel that cannot accommodate existing water runoff and sediment thickness that covers the drainage channels so that the capacity is reduced, if it rains it will cause puddles at several points in Tarakan City. In order to deal with these puddles, it is necessary to change the dimensions of the channel and routinely dredge sediments that cover the drainage channels.

This study aims to determine the performance on a single weave that occurred on Jl.Niaga I - Jl. Yos Sudarso, Tarakan City. The performance is capacity, degree of saturation, speed, and travel time. With these performance parameters serve as based of planning in transportation infrastructure. The results of this study are also expected to provide recommendations to users, planners and policy makers in an effort to solve traffic problems, especially to reduce the delay that occurs in a single wave that occurred on Jl Niaga I-Jl. Yos Sudarso Kota Tarakan.

The strength of the building foundation is strongly influenced by the type of soil layer that used as a foundation laying place. The higher the building to be built, the stronger the foundation to be made. This research was conducted to identify the bedrock of the existing soil layer in Tarakan City by using a boost converter-based resistivity meter with aim to minimize the impact of building damage caused by soil structure. Boost converter is a step-up DC-DC converter. Boost converter is able to produce an output voltage value greater than the input voltage without the need of transformer. The boost converter design is started by determining parameter based on the needs of resistivity meter. Resistivity data acquisition has been conducted at several points in Universitas Borneo Tarakan by using the Schlumberger configuration. Data processing has been done by using a matching curve. The results of the interpretation of the processing of geoelectric data are 4 soil layers with a depth of 12 meters. In the geoelectric estimation investigation area has a type of resistance between 6.08 -169.79 Ohm-meters. The layer that is expected to act as a bedrock is sand at a depth of 13.81 meters and sandstone sand at a depth of ± 8 meters, with these conditions, the construction of a foundation for the construction of lightweight buildings can already be built

Air merupakan salah satu elemen utama kehidupan makhluk hidup, sehingga semua mahluk hidup sangat memerlukan air. Untuk mencukupi kebutuhan air bersih pada masyarakat dapat menggunakan air hujan, air tanah dan lain-lain, penggunaan sumber air tanah perlu diketahui potensi jumlah maupun mutunya. Penyebaran air tanah dideskripsikan secara vertikal dan horizontal, deskripsi air secara horizontal dapat dilihat melalui penyebaran formasi geologi yang bertindak sebagai akuifer. Untuk mendapatkan kondisi hidrogeologi dan geologi perlu dilakukan kajian dengan menggunakan metode geolistrik melalui resistivity meter. Berdasarkan latar belakang tersebut, peneliti menerapkan keunggulan boost converter pada desain resistivity meter yang diusulkan. Konfigurasi Elektroda yang diterapkan dalam penelitian ini menggunakan metode Schlumberger dengan parameter yang terukur ialah arus listrik (I), beda potensial (V) dan spasi elektroda, sedangkan parameter yang dihitung adalah tahanan jenis ( ). Data hasil pengukuran diolah untuk didapatkan penampang model resistivity 1 dimensi (1D) bawah permukaan. Berdasarkan hasil eksplorasi geolistrik dan perhitungan-perhitungannya menunjukkan keberadaan akuifer air tanah pada kedalaman 6.54 -56.67 m dengan tahanan jenis 36.98 Ωm dan perkiraan litologi adalah pasir.

Almost every year the city of Tarakan experiences problems regarding standing water during the rainy season, especially in the West Tarakan sub-district which is the center of Tarakan City. This puddle not only submerged settlements and offices but also shops and road access which caused considerable economic losses. This can be overcome by analyzing the risk of waterlogging where each area has a different level of vulnerability. The purpose of this study is to determine high, medium, and low risk areas for standing water in the Drainage Area of West Tarakan District, Tarakan City. The research implementation method includes data collection (institutional and field surveys), analyzing the index of vulnerability, vulnerability and capacity and analyzing the flood risk map. The index analysis is carried out through simulated parameter score analysis. Based on the results of the analysis of the research data, it can be concluded that the water inundation risk index in the West Tarakan District is as follows, the sub-districts that are on the highest risk index are Karang Anyar sub-district, then Karang Rejo village, kelurahan Karang balik and Kelurahan Karang Newar Pantai Nerda is at index 2 or is at a moderate risk index, then the kelurahan that has the lowest risk index is Hope Reef with a risk index of 1