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Flood routing model using integration of Delft3D and GIS (case study: Tanggul watershed, Jember)

AIP Conference Proceedings 2020年第1期2278卷

作者： Taqiuddin Haq Gusfan Halik Entin Hidayah 1Master Student of Civil Engineering Department University of Jember. Indonesia 2Lecturer of Civil Engineering Department University of Jember. Indonesia 3Lecturer of Civil Engineering Department University of Jember. Indonesia

Flood disaster is one of the most common disasters in Jember District. One that is often affected is in 10% of the area of Jember District, namely the Tanggul watershed with an area of 345,875 km2. The condition of Tanggul River, with a length of 23.50 km, which tends to narrow and meander can reduce flow especially when the river discharge is enlarged due to rain. If rainfall is above 100 mm on the upstream part of the watershed, then the downstream of the Tanggul River with a length of ± 10.19 km that passes through Paseban Village, Kraton Village, and Kencong Village are often unable to withstand the discharge which will overflow the surrounding area. The history of flood occurences in the Tanggul watershed in the last 25 years had occurred 27 times, including 9 times which resulting in breakdown of the embankment. According to records from the Lumajang Public Works Office, the latest flood event in Tanggul River was occurred on December 22, 2018 with water elevation reaches 3.5 m and a discharge of 749,153 m3. This resulted in a broken embankment with a length of 60 m and a height of 7.2 m from the riverbed. Mitigation efforts such as flood routing to get an overview and information on overtopping points is needed to be done in order to minimize losses. This research aims to simulate flood using integration of the main programs DELFT3D and GIS. The flood routing model is obtained by utilizing a spatial model of analysis in Geographic Information Systems (GIS) to determine critical embankment or overtopping points and hydraulic flow simulation with DELFT3D program. The modeling results are visually compared with the coordinates of the flood events in the field that prepared by the Lumajang Public Works Office. Based on the 1000-year return period, the overtopping point occurs at ± 12.8 km from the downstream, namely Kencong District and ± 11.8 km from the downstream, namely Paseban District. In the end, this model can be used as a framework for the Tanggul waters

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Loan to value (LTV) ratio policy and its impact to property development

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AIP Conference Proceedings 2020年第1期2230卷

作者： Dyar Paramitha Ahmad Gamal Azrar Hadi 1Master Student Program Architecture Department Faculty of Engineering University of Indonesia Indonesia 2Assistant Professor Architecture Department Faculty of Engineering University of Indonesia Indonesia 3Lecturer Architecture Department Faculty of Engineering University of Indonesia Indonesia

One of the changes in Bank Indonesia (BI) policy Number 20/8/PBI/2018 (PBI, 2018) regulates the Loan to Value (LTV) ratio for a residential property loan. This research examines changes in housing developer behavior in providing the housing products before and after the loan to value ratio (LTV) easing policy. The changes in the Bank Indonesia policy to release the loan to value ratio for the purchase of the first house with an area of more than seventy square meters is one of the government's solution to encourage the growth of housing property. This issue is due to the difficulty of the first-time home buyer in paying the down payment. The design of this research uses a case study of multiple case holistic designs and uses a qualitative analysis method. Qualitative data were obtained from in-depth interviews with nine housing developers. We found that most developers are willing to change their market segmentation to a lower segment (36 household type) than the previous ones that they have set. We concluded that the LTV ratio easing policy cannot help many developers if the macroeconomic conditions are still weak.

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The origin-destination matrix for freight transportation with Bayesian inference method

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AIP Conference Proceedings 2018年第1期1977卷

作者： Syafi’i Mohamad Budi Santoso Dewi Handayani 1Lecturer of Department of Civil Engineering Universitas Sebelas Maret Indonesia 2Student of Undergraduate Program of Civil Engineering Universitas Sebelas Maret Indonesia 3Lecturer of Department of Civil Engineering Universitas Sebelas Maret Indonesia

Transportation is one of the basic needs of a city in the effort to improve the welfare of its citizens. The presence of transactions and trades in freight system positions transportation as an important component in regional economic development. Surakarta region has a vital role in the economic growth of Central Java Province with the support from surrounding regencies, such as Karanganyar, Boyolali, Sukoharjo, Wonogiri and Klaten. The objective of this research was to estimate the Origin-Destination (O-D) Matrix for freight transportation in Surakarta. This study covered the area of Surakarta including the connections of the area with the major external freight trading zones. By estimating the β parameter, which is the detterence function of Gravity Model, and using the approach of Bayesian Inference, the results showed the total freight trip obtained from the O-D matrix in 2017 was 1788.2 PCU/hour. The value of β from Bayesian Inference approach was 0.00807. The proposed approach has good validity as shown by the coefficient of determination (R2) of 0.81.

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Analysis of basement establishment effect of solo mix-used development (MD) towards water tables

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AIP Conference Proceedings 2018年第1期2014卷

作者： Muhammad Hasan Wicaksono Cahyono Ikhsan Bambang Setiawan 1Student of Master Program of Civil Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 Indonesia 2Lecturer of Master Program of Civil Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 Indonesia 3Lecturer of Master Program of Civil Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 Indonesia

The basement construction of Solo Mix-used Development (MD) with limited land located in the center of Surakarta city requires the construction of basement as a parking most of that construction is made with soil excavation. This soil excavation can affect the water table around the project. This research aimed to figure out the rate of decreasing of the water table. The research methods which used were a study of soil characteristic and observation of wells. The study of soil was done by investigating 2 zones consisting of 5 drill points with a depth of 60 m and 40 m. The observation of wells was conducted at 25 m and 125 m distance from main well pumped with a variation of discharge capacity. The results of the soil investigation indicate that the water table at the location of the project site is between -3.1 m∼-3.2 m depth. The results of the decrease of the water table at 25m distance and distance 125m are 0.89 m and 1.82 m respectively. The decrease of the water table occurred in the extreme at the discharge of 1.30 m3/sec with the decrease of 5.27 m which can get the residents’ wells dry. It is expected that there is further information about the rate of the water table, so that it could be figured out the decrease of water table outside the location of the basement.

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The evaluation of irrigation operation of Dimoro Irrigation Area, Karanganyar Regency, Central Java, Indonesia

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AIP Conference Proceedings 2018年第1期1977卷

作者： Dian Retno Anugrah Sobriyah Dewi Handayani 1Student of master program of Civil Engineering Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta Indonesia 3Department of Public Works Karanganyar Jl. Lawu No.341 Kompleks Perkantoran Karanganyar Indonesia 2Lecturer of master program of Civil Engineering Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta Indonesia

In an irrigation system, one of the important activities in addition to maintenance is irrigation operations. The indicators of successful irrigation operations are the increased water use efficiency, the increased cropping intensity, the declined water-sharing conflicts, the increased agricultural production, and the decreased crop dryness. This research was conducted to know the success of irrigation operation in an irrigation area, which is Dimoro Irrigation Area at Karanganyar Regency. Data were taken from 2013 to 2016. The analysis was based on the AHP weighting, ranking scale and Permen PU No. 32/2007 to determine the performance condition of irrigation operations. The results of the performance of Dimoro Irrigation operations in 2013, 2014, 2015, and 2016 were 74.38%, 81.96%, 90.12%, and 100%, respectively. It can be concluded that the performance of irrigation operations showed an increasing trend that indicates the success of irrigation operation in Dimoro Irrigation Area.

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Study of morphometry to debit drainage basin (DAS) arau Padang city

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AIP Conference Proceedings 2017年第1期1903卷

作者： Lusi Utama Amrizal Isril Berd Zuherna 1Students of Civil Engineering Doctoral Program Andalas University Padang Indonesia 2Lecturer Department of Agriculture Andalas University Indonesia 3Lecturer Department of Agriculture Andalas University Indonesia 4Lecturer Department of Civil Engineering Bung Hatta University Indonesia

High intensity rain that happened in Padang city cause the happening of floods at DAS Arau. Floods that happened in Padang besides caused high rain intensity, require to be by research about morphometry that is cause parameter the happening of floods. Morphometry drainage basin physical network (DAS) quantitatively related to DAS geomorphology that is related to form of DAS, river network, closeness of stream, ramp, usage of farm, high and gradient steepness of river. Form DAS will influence rain concentration to outlet. Make an index to closeness of stream depict closeness of river stream at one particular DAS. Speed of river stream influenced by storey, level steepness of river. Steepness storey, level is comparison of difference height of river downstream and upstream. Ever greater of steepness of river stream, excelsior speed of river stream that way on the contrary. High to lower speed of river stream influence occurrence of floods, more than anything else if when influenced by debit big. Usage of farm in glove its link to process of infiltration where if geology type which is impermeable, be difficult the happening of infiltration, this matter will enlarge value of run off. Research by descriptive qualitative that is about characteristic of DAS. Method the used is method survey with data collecting, in the form of rainfall data of year 2005 until year 2015 and Image of DEM IFSAR with resolution 5 meter, analyzed use Software ARGIS. Result of research got by DAS reside in at condition of floods gristle.

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