bluuebunny/crossref_metadata_2025 huggingface dataset:
Modification of Septic Tank for Sedimentation Optimization in the Public Toilet (Case Study at Wisdom Park UGM)
Authors: Syafira K , Ahmad J S M , Saraswati S P
Published: December 2021

Septic tank with sedimentation and anaerobic processes in the same tank is commonly used as a domestic wastewater treatment technology in individual households and communal systems. Although simple to construct, such a system has some problems, such as effluent not meeting the quality requirement and blocking by trash and suspended solid before the second treatment chamber. This research aims to develop a new septic tank design that is simpler to construct and improve performance. The new design uses HDPE material, which is easier to build and standardized compared to the conventional concrete structure. The performance of the new design was compared to the conventional septic tank. The start-up process was monitored for flowrate, COD, TSS, NH3N, PO4-P parameters and evaluated against effluent standards. The study was conducted at public toilet facilities at Wisdom Park UGM and Sunday Morning Market. Results from the study show that the new design effectively improves effluent quality and overcomes the trash problem.
Microplastic pollution in the sediment of Jakarta Bay, Indonesia
Authors: Azizi A , Setyowati W N , Fairus S , Puspito D A , Irawan D S
Published: December 2021

During the COVID-19 pandemic, the increased use of plastic for personal protective equipment (PPE), single-use plastic bags, and food packaging raised significant environmental concerns. This study aimed to investigate the shape, abundance, and type of microplastics in the sediment of Jakarta Bay, specifically Tanjung Priok, Ancol Beach, and Sunda Kelapa Port. Sediment was collected using an Ekman sediment grab sampler and was extracted using the density separation method. The microplastics were counted and categorized according to the shape under a microscope. The differences in microplastic abundance in three different stations were determined using a one-way ANOVA. The polymer of microplastics was identified using Fourier Transform Infra-Red (FTIR). The results show that the abundance of the microplastics from coastal sediment was highest in the Sunda Kelapa Port (45066.67 ± 5205.13 particle/kg dry weight), which is significantly different (p<0.05) from Tanjung Priok (40533.33 ± 2444.04 particle/kg dry weight) and Ancol Beach (34666.67 ± 2444.04 particle/kg dry weight). Fragments dominated the shape of microplastic in Tanjung Priok, Ancol Beach, and Sunda Kelapa Post, comprising 36%, 40%, 38%, respectively, followed by fiber, film, and pellet. The FT-IR tests indicated that polypropylene (PP), polyethylene (PE), polystyrene (PS), and polyamide are the most prevalent microplastic polymers.
Diffusion of chloride from seawater into the concrete analysis: a literature review on implemented approaches
Authors: Ariningsih Y S , Nuralinah D , Saputra A W W
Published: December 2021

Infrastructures near the sea, such as ports, offshore platforms, bridges, and coastal buildings, are affected by seawater due to the coastal region. Chloride, contained in seawater, causes a decrease in the strength and durability of the concrete. Some researchers have published a paper on analyzing the penetration of chloride ions into concrete under different coastal environments and predicted chloride diffusion in concrete with computational modeling. This paper aims to review the existing literature related to various laboratory work tests and analytical methods in evaluating the diffusion of chloride from seawater into concrete. A set of forty papers were collected and reviewed that were published from 2011 until 2020 for studying. The review showed that chloride diffusion was a complex process and affected by many factors such as material properties, curing time, immersion/exposure time, and environmental conditions. Various experimental methods in the Laboratory were conducted using concrete specimens made from various materials in the exposed and submerged conditions. Researches in the field were carried out on existing structures with a certain building age using non-destructive testing. Meanwhile, the analytical methods applied simple equations and numerical simulation computational software.
Sustainable ground improvement method using encapsulated polypropylene (PP) column reinforcement
Authors: Hasan M , Zaini M S I , Hong N A W , Wahab A , Masri K A , Jaya R P , Hyodo M , Winter M J , Sholichin M , Haribowo R
Published: December 2021

This study investigates the effectiveness of encapsulated polypropylene (PP) column in enhancing the undrained shear strength of kaolin (soft clay). The usage of PP in treating problematic soil is a more sustainable and cost-effective alternative compared to other materials. The installation of granular column can be done by using vibro-replacement method. Several geotechnical tests to determine the properties of materials were conducted. The shear strength of treated kaolin sample was examined by using Unconfined Compression Test (UCT). There are seven (7) batches of soil sample in total which included a control sample, three (3) batches of 14 mm and three (3) batches of 20 mm diameter PP column. Different diameters of PP column were examined with 60 mm, 80 mm and 100 mm height, respectively with soil sample of 50 mm in diameter and 100 mm in height. The shear strength improvement of kaolin is 33.82%, 46.51%, and 49.88% when implanted with a PP column with a 7.84 area replacement ratio and 0.6, 0.8 and 1.0 penetration ratio. The soft soil treated using 16.00 area replacement ratio with 0.6, 0.8 and 1.0 penetration ratio has a shear strength increment of 25.22%, 33.39% and 37.59% respectively. In short, the shear strength improvement of the kaolin clay depends on the parameter of the PP column used to reinforce the sample.
Evaluation of water supply alternatives for mineral water teaching factory
Authors: Sarosa M , Hapsari R I , Moentamaria D , Adhisuwignjo S , Putri R I , Buwono H P , Rohadi E , Wibowo S
Published: December 2021

The teaching factory (TEFA) in State Polytechnic of Malang (Polinema) attempts to address the replication of the real industrial process inside the traditional educational setting. In Polinema, the TEFA deals with the bottled mineral drinking water, and its supply chain starts from the water purifying until the marketing. A key aspect of achieving an economically and technically feasible production is the selection of wellspring as the source of raw material. The potential water sources are located at Wringinsongo, Ampeldento, Prigen, and Ngijo in Malang area. A decision support system is required to select the suitable source by integrating weighted tangible and intangible criteria, namely water quality, distance, and willingness to pay. Multicriteria decision-making by analytical hierarchy process is applied to assign criteria weight and select the source. The results demonstrate that Ngijo wellspring is recommended, followed by Wringinsongo, Ampeldento, and Prigen according to the performance value. The system could serve as a tool for the selection, instead of intuitive judgment with a better compromise for improving the TEFA productivity.
Seasonal Spatio-temporal Land Cover Dynamics in the Upper Brantas Watershed
Authors: Beselly S M , Lufira R D , Andawayanti U
Published: December 2021

Quantitative assessment for sustainable watershed management is essential. Hydrological parameters such as stream discharge, surface runoff, infiltration, groundwater recharge, and water quality are susceptible to the changes of the components in the river basin ecosystem. Numerous studies have shown that the Land Use Land Cover (LULC) changes such as deforestation, extensive agriculture, urbanization, and mining are recognized as the main factors to changes in LULC, which are related to the changes of the hydrological components of the river basin of all scale. This paper particularly shows the spatiotemporal variability of LULC in the Upper Brantas Basin and the effects on the river discharge variation. We showed that the changes in LULC, particularly cultivated and managed vegetation and urban/built-up area, contributed significantly to the river discharge. Particularly in the Upper Brantas Basin, it was indicated that almost half of the increased river discharge was explained by the increase of urban/built-up and the decrease in cultivated and managed vegetation area.
Investigation Of Hydraulic Flow Characteristics On Drop Structures
Authors: Dermawan V , Dermawan D R , Ismoyo M J , Wicaksono P H
Published: December 2021

Drop structures are required if the slope of the ground level is steeper than the maximum allowable gradient channel. Drop structures become bigger as height increases. Its hydraulic capability may be reduced due to variations of jets falling on the stilling basin floor due to discharge changing. Drop structures should not be used if the change in energy level exceeds 1.50 m. The free-falling overflow on drop structures will hit the stilling basin and move downstream. As a result of overflows and turbulence in the pool below the nappe, some energy is dissipated at the front. The rest of the energy will be reduced downstream. The objectives of this study are to investigate the hydraulics flow behavior in straight and sloping drop structures and to investigate hydraulics flow behavior in a single and serial vertical drop (stepped drop). The hydraulic model results of single and stepped drop structures are compared to obtain flow behavior and energy dissipation information. The comparisons are specific to the flow parameters, including flow depth at the drop structures toe, flow depth after the jump, and hydraulic jump length.
Pattern and direction of groundwater flow and distribution of physical-chemical properties of groundwater in Randublatung basin
Authors: Tantama E E , Kumara M A , Putra D P E , Marliyani G I
Published: December 2021

The people in the Randublatung basin (Grobogan, Blora, and Bojonegoro Regencies) using groundwater for daily needs and agriculture activity. As the initial step of basin-based groundwater management, it is necessary to understand the groundwater potential in this area: pattern and direction of groundwater flow and groundwater physical-chemical properties (pH, temperature, total dissolved solids, and electrical conductivity). This research aims to analyze the pattern and directions of groundwater flow, the physical-chemical properties, and the correlation between the two. This research method is field measurement of 45 different spots of dug wells in the Randublatung basin. Our results indicate that the pattern and direction of groundwater flow in the Randublatung basin are heading to Bengawan Solo River and then following the river’s flow. The groundwater physical-chemical properties measured: pH value is 6.8 on average, the temperature is 28.9 °C on average, TDS concentration is 409 mg/L average, and electrical conductivity rate is 843 μS/cm average. There is no significant correlation between groundwater flow with pH value and groundwater temperature. However, groundwater TDS concentration and electrical conductivity rate in the Randublatung basin increase as groundwater flows to the Bengawan Solo River, which is affected by the minerals of aquifer rocks (alluvial deposits).
Modification of basic hydrology formulation based on an approach of the rational method at field measurement
Authors: Kencanawati M , Anwar N , Maulana M A
Published: December 2021

The rational method was a simple technique for estimating the design discharge of a small watershed and can be used in a probabilistic approach. The main parameter in the rational method formula was the C coefficient. The rational method was the primary method for determining the peak discharge from surface runoff flow. At the end of the dry season and the beginning of the rainy season, it placed an automatic water level recorder and automatic rain gauges for the initial water level. This field research aimed to correct a simple hydrological formulation with field measurements and build a numerical rainfall modelling based on rainfall simulation, infiltration, land use, and flow parameters according to the relationship model of precipitation. The hypothesis in this study, the basic formulation of hydrology, is simple: it requires experience to fit the theoretical hydrological formula so simply (simplicity). The theory needs to be simplified because it is an experience of field necessary to explain.
Evaluation of surface water for agricultural irrigation in Lobalain District, Rote Ndao Regency, East Nusa Tenggara Province, Indonesia
Authors: Riady R R , Wilopo W , Warmada I W
Published: December 2021

The average rice productivity of the Rote Ndao Regency is still below the national rice productivity. The cropping pattern’s lack of management and limited water sources can only be planted once a year. This study aims to determine the availability and quality of surface water used for irrigation with the existing rice-corn-fallow cropping pattern. The research was carried out by measuring discharge in the field, surveying the types and cropping patterns, irrigation area research, surface water quality analysis, and hydrological analysis. The results showed that the need for irrigation water for agriculture in the study area with the current cropping pattern was 0.84 lt/second/ha. Therefore, the existing irrigation area of ±3,762.00 Ha requires a water discharge of ±3.159 m3/second. The availability of surface water in the Lobalain District is low, with a discharge of ±1.598 m3/second. Surface water quality shows the percentage of sodium (Na%) dominated by excellent to permissible class, and the sodium adsorption ratio (SAR) excellent. The existing resource of surface water could not support agricultural irrigation. Therefore, it is necessary to find an alternative water source such as groundwater.
Determination Of Groundwater Recharge Area In Raimanuk And Surroundings, Timor Island
Authors: Manta W F , Hendrayana H , Amijaya D H
Published: December 2021

The Raimanuk area in Timor, East Nusa Tenggara, is located in the Aroki Groundwater Basin. The decreasing quality and potential groundwater availability in the Aroki Groundwater Basin is feared due to its widespread use for household needs and agriculture. The lack of the groundwater recharge area map will pose an obstacle in policymaking regarding the management and preparation of spatial conservation areas in the Raimanuk Region. This study aims to determine the zone and classification of groundwater recharge areas in the Raimanuk area based on spatial data analysis. The groundwater recharge area can be determined using slope, river flow patterns, spring emergence, and groundwater table depth. The classification of the recharge area uses a scoring approach with an overlapping analysis of the parameter assessments, which are hydraulic conductivity, precipitation, soil cover, slope, and depth of unconfined groundwater. The result of the study is the groundwater recharge area map of Raimanuk. The groundwater recharge area is located in the Mandeu Hill area, which is the main recharge area. The groundwater discharge area is located in the Aroki plain area that can be the main recharge area.
Economic Feasibility Analysis Development of Intake and Raw Water Pipelines in Kota Bangun Sub-District, Indonesia
Authors: Marsudi S , Lufira R D , Sari S , Riadi D
Published: December 2021

Increasing the population in Kota Bangun Sub-District, Kutai Kartanegara Regency, in line with the consequence that growing needs for drinking water and raw water for local communities become a top priority. Public complaints about the increasing difficulty of obtaining clean water seem to be an obstacle that the Regional Government has yet to resolve fully. The production capacity of PDAM Kota Bangun is currently only 30 liters/sec, which is far from sufficient for the needs of all people in the Kota Bangun Sub-District. Economic feasibility calculation analysis utilized the NPV, IRR, and BCR methods and sensitivity analysis to obtain the economic feasibility for the value of developing intake and raw water networks. The results indicate, with a reasonable life condition of 30 years, the construction of water networks in Kota Bangun is still economically feasible. Reasonable with the minimum requirement of BCR = 1, with sensitivity analysis on two scenarios, considerations of 30% and 20% leakage, and 30.55% and 25% administrative costs. The results of the research show that IRR = 17.70%. If the analysis conditions are that investment costs increase by 10% with Fixed Benefits, the payback period is 6.8 years.
An Alternative Algorithm for Simulating Flash Flood
Authors: Khaldirian M F , Rahardjo A P , Luknanto D , Sondi R D R
Published: December 2021

Most of the approaches in numerical modeling techniques are based on the Eulerian coordinate system. This approach faces difficulty in simulating flash flood front propagation. This paper shows an alternative method that implements a numerical modeling technique based on the Lagrangian coordinate system to simulate the water of debris flow. As for the interaction with the riverbed, the simulation uses an Eulerian coordinate system. The method uses the conservative and momentum equations of water and sediment mixture in the Lagrangian form. Source terms represent deposition and erosion. The riverbed in the Eulerian coordinate system interacts with the flow of the mixture. At every step, the algorithm evaluates the relative position of moving nodes of the flow part to the fixed nodes of the riverbed. Computation of advancing velocity and depth uses the riverbed elevation, slope data, and the bed elevation change computation uses the erosion or deposition data of the flow on the moving nodes. Spatial discretization is implementing the Galerkin method. Furthermore, temporal discretization is implementing the forward difference scheme. Test runs show that the algorithm can simulate downward, upward, and reflected backward 1-D flow cases. Two-D model tests and comparisons with SIMLAR software show that the algorithm works in simulating debris flow.
Performance of Flushing Efficiency of Sediment Evacuation from Wlingi and Lodoyo Reservoirs
Authors: Legono D , Hidayat F , Sisinggih D , Wahyuni S , Suharyanto A
Published: December 2021

The sediment evacuation from the reservoir should be carried out when it disturbs the dam development’s functional design. There are issues regarding the objection to releasing sediment from the reservoir, especially related to potential environmental degradation of the river downstream. The sediment source entering the reservoirs is considerably variable, depending upon the catchment characteristics and the hydrological triggers. When limiting the erosion yield and controlling the sediment in the catchment, evacuating sediment from the reservoir could be the only alternative to avoid environmental degradation. Several issues showed that sediment evacuation from reservoirs is a cost-effective solution. Therefore, assessing the efficiency of sediment evacuation from a reservoir through flushing has become of high interest. This paper presents the analysis of the flushing efficiency performance of the flushing operation of Wlingi and Lodoyo Reservoir that was carried out on 10-17 March 2019. The flushing efficiencies are found to be 0.005 and 0.003 for Wlingi and Lodoyo Reservoirs, respectively. These figures are lower than that of Mrica Reservoir and other world reservoirs at higher than 0.1. Further analysis suggests the critical timing of the sediment evacuation schedule considering the inflow condition.
Forensic investigation of Gumbasa irrigation main canal damage due to large-scale flow liquefaction in Sibalaya caused by the 2018 Sulawesi Earthquake
Authors: Nurdin S , Arsyad A , Marhum F A , Setiawan H
Published: December 2021

This study conducted an extensive soil investigation in the Sibalaya liquefaction area to identify the Gumbasa main canal’s damage triggered by flow liquefaction. Several field tests and trenches with approximately 4 m were excavated to observe liquefied soil layers directly near the canal. A borehole, standard penetration test, and multichannel analysis surface waves (MASW) were performed beside the trench to obtain each layer’s penetration resistance. This research aims to understand the landslide’s whole aspect. The ground movements were analyzed by using satellite photos before and after the earthquake. The displacement of the main canal, the typical damage inventory, and the proposed reconstruction of the main canal are the focus of this study. As a result of the forensic investigation, the liquefied layers and debris flow contributing to the massive landslide were identified to impact the primary canal. The typical damage of the canal was due to surface rupture that occurred both horizontally and vertically. A solution for reconstructing the main canal is to use a flexible pipe canal structure. That will be resilient to future earthquake and ground movements, stabilize the ground downslope of the existing canal to limit the risk of future lateral movement in future earth tremors.
Identification of Flood-prone Areas using HEC-HMS and HEC-RAS, the Case of Ciberang River Basin, Lebak District of Banten Province
Authors: Ynaotou  , Jayadi R , Rahardjo A P , Puspitosari D A
Published: December 2021

It is common practice that flood hydrograph simulations help to provide better flood prediction and flood damage reduction planning. These efforts require information on flood-prone areas identification from the hydrological and hydraulic analysis results. Historically, the Ciberang River Basin has experienced floods. Those floods cause the loss of human life and damage some houses along the river’s channels, especially in Lebak District, Banten Province, Indonesia. The main objective of this study is to identify flood-prone areas based on the simulation result of a hydrologic and hydraulic model of catchment response due to several extreme rainfall events using HEC-HMS and HEC-RAS software. Rainfall and discharge data measured at the Ciberang-Sabagi water level gauge on 10 January 2013 were used to calibrate hydrological watershed parameters. The hydraulics channel routing is started from the planned location of the Sabo dam to the downstream control point. The next stage was the simulation of rainfall-runoff transformation and 1D unsteady flow channel routing for the 2, 5, and 10-years floods return periods. The main result of this study is a flood hazards map that shows the spatial distribution of the area and inundation depth for each return period of the flood.
Seepage Patterns in an Earth-Rock Fill Dam Evaluation using Electrical Resistivity Tomography (ERT) Method
Authors: Fata Y A , Suhartanto E , Hendrayanto  , Rubiantoro P
Published: December 2021

Seepages in the earth-rock fill dam are usually monitored by pore pressure, seepage water table, and seepage discharge. However, those monitoring are difficult to describe the seepage patterns because they are installed only in certain points. This research evaluated the seepage pattern resulting from Electrical Resistivity Tomography (ERT). The resistivity was measured by installing electrodes upstream of the Dam at every 10 m and downstream at 20 m distances. The seepage pattern was analysed from the resistivity 2 Dimension distribution using the RES2DINV program. The results showed that the seepage pattern resulting from the ERT method’s resistivity data, which was compared with data of surface dam deformation, pore pressure, and seepage water table, could explain the seepage discharge data. Based on those confirming data, the resistivity data of the ERT method was appropriate to explain the seepage pattern in the earth-rock fill dam and can be further utilized for dam stability analysis.
Towards sustainable community: Effort to reduce flood risk and increase well-being in a densely populated flood-prone area
Authors: Sedyowati L , Chandrarin G , Nugraha G I K
Published: December 2021

Dealing with flooding in a densely populated flood-prone area poses complex challenges. Almost all residents realize that living in the area is hazardous. However, they choose to stay there. Therefore, flood risk management should be applied in the area. This study aims to: 1) develop facts of the local community in a flood-prone area in decreasing the flood risk while improving well-being through modifying drainage channels used for fish and vegetable farming; 2) evaluate all benefits of drainage investments include the social and economic benefits. The research method consists of a quantitative approach through the distribution of questionnaires and a qualitative approach through in-depth interviews and field surveys. In this study, a concerted community effort was developed as a design parameter. At the same time, the observation parameters include knowledge of the causes of flooding, knowledge of flood risk, community involvement, and government flood control programs. The results showed that the strength of concerted community effort was significantly influenced by the knowledge of flood risk and the local community involvement. This effort can decrease the flood risk by up to 30% and serve direct financial benefits of IDR 48 million in a year.
Stabilization of Kaolin Clay Soil Reinforced with Single Encapsulated 20mm Diameter Bottom Ash Column
Authors: Hasan M , Zaini M S I , Hashim N A A , Wahab A , Masri K A , Jaya R P , Hyodo M , Winter M J , Sholichin M , Haribowo R
Published: December 2021

Ground improvement methods are used to reduce the weakness of soft clay, which is low strength and high compressibility. The stone column technique involves replacing any of the soil with crushed stone such as broken rocks or sand which is an efficient method of improving the strength parameters of soil. Bottom ash usage in materials of building will effectively decrease the buildup of the waste and hence protect the environment. This study is to determine the shear strength of kaolin soft clay reinforced with a 20 mm diameter single encapsulated bottom ash column with various lengths. The research will look into the physicomechanical qualities of the materials used, including subsoil and bottom ash. Three (3) batches of samples with each batch consists of five (5) samples were prepared by using compaction method. All kaolin samples with a diameter of 50mm and height of 100mm with single encapsulated bottom ash columns with various lengths which are 60mm, 80mm, and 100mm were tested under Unconfined Compression Test (UCT). The result illustrated that the strength of samples increases as the height and volume of encapsulated bottom ash column increases.
Swelling Characteristics of Compacted Claystone-Bentonite Mixtures
Authors: Arifin Y F , Arsyad M , Muslim H
Published: December 2021

High-density claystone mixtures have been suggested as liners in radioactive waste repositories. However, this material can also be used as a liner in landfills. This study focuses on swelling characteristics of compacted claystone-bentonite at a low density for landfill applications. Claystone was taken from the Banjarbakula landfill project in Banjarbaru. The bentonite used is a commercially available bentonite from Indonesia. Claystone was mixed with 5, 10, 15, and 20% of bentonite on a dry weight basis. The mixture was statically compacted with moisture contents of 10, 15, and 20% to achieve a dry density of 16 kN/m3. A swell-load test was carried out using conventional oedometer equipment to obtain the swelling potential and swelling pressure of the samples. The results show that the swelling potential and swelling pressure increased with an increase in bentonite contents. At a bentonite content of more than 10%, both increased significantly. This research also revealed a linear relationship between swelling potential and swelling pressure.
Comparison Study Of Physical And Mechanical Properties Of AC-WC Mixtures And Porous Asphalt Mixtures With Variations Of Binding Materials
Authors: Hafidz M D , Fauziah M , Subarkah
Published: December 2021

Pavement performance is influenced by the selection accuracy of material and gradation. AC-WC has good stability but low porosity, so that puddles often occur on the surface. While porous mixture has high porosity to reduce the puddles quickly but low stability. Therefore, modified asphalt is needed to improve the performance of the mixture. This paper presents of an experimental laboratory study on the physical and mechanical performance of AC-WC and Porous asphalt mixture with Starbit E-55 and Pen 60/70. Laboratory works start with a physical test of all the material used, then, tests to find optimum asphalt content are conducted. Finally, test on Marshall properties and Index of Retained Strength (IRS) were run. Results showed that Starbit is more resistant to temperature than Pen 60/70. AC-WC mixture with Starbit has greater air void, 11% greater stability, 13% greater MQ, and IRS of the mixtures using Starbit were higher than those with Pen 60/70. While the Porous mixture with Starbit has greater air void, 22% higher stability, 13% greater flow, 9% greater MQ compared to Pen 60/7. This proves that the use of Starbit is more effective for improving the structural and functional performance of AC-WC and Porous mixture.
Awareness Before and During Pandemic toward Food Waste: “Comparison between Indonesia and Japanese Students”
Authors: Christine  , Aliefia D , Syaputra G E , Novella U , Yamazaki A , Nakatsuka K , Fujiyama I
Published: December 2021

In recent years, food waste has become a global issue that often becomes the subject of public debate and has already been put into the SDGs programs which are targeted to be realized in 2030. A large amount of food waste is produced in the food service and infrastructure sectors, especially during this pandemic, which makes the foodservice sector difficult. However, this study compares and identifies students’ awareness of food waste in Indonesia and Japan. The data were primarily gathered through a questionnaire with 100 students in each country. This study uses the comparative concept to compare the results of research before and during the pandemic on students. Based on the results, this study discusses the extent to which students are aware of the behavior of leaving food, checking the expiration date, knowledge about food waste. Both Indonesian and Japanese students become more aware of the food waste that occurred.
Outlining Smart Kampung Indicators: Preference Study in Kampung Terban Yogyakarta
Authors: Maharika I F , Permana S A , Nugraheni F , Böhlen M
Published: December 2021

Kampung, as a form of Indonesia’s informal urbanism, requires special attention in terms of urban development. Efforts to manage the quality of kampung space have become very important, including planning and development through smart system applications. However, the culture of the community living in kampung in accepting a new system has not been well-mapped. This research aimed to be the beginning of the development of smart kampung system that focuses on identifying the community’s preferences for the concept of this novel system. The research was conducted by a case study in Terban Subdistrict, Gondokusuman, Yogyakarta using Analytical Hierarchy Process methods. Initial findings indicate that Terban community’s preference for the concept of kampung is based on the concept of providing alternative energy and water quality. The research also shows that of smart city projects in the future should include community participation to ensure its applicability, acceptance, and sustainability.
A Study of the Hazard Level and Vulnerability of the Society Against Debris Flow of Merapi in the Putih River Watershed, Indonesia
Authors: Ikhsan J , Faizah R , Hairani A , Sutawiguna P T
Published: December 2021

Mount Merapi is one of the most active volcanoes in Indonesia with a relatively fast period of around 2-7 years. The impact of hazards arising from a fire eruption, such as primary hazards, namely hazards that occur directly, secondary hazards, namely hazards that occur indirectly or take place after an eruption, tertiary hazards, namely environmental damage around the volcano. This study aims to determine the value of the hazard level and vulnerability to debris flow in the Putih River watershed. The research method used in this study is to use the scoring and weighting method. The results obtained from the scoring and weighting methods, Srumbung and Mranggen villages have a debris flow hazard with a total value of 2.6 which falls into the high hazard level category. The results show that Srumbung Village obtained a total value of 7.92 which is included in the medium level of vulnerability category. Parameters that have a big influence on the level of community vulnerability to debris flows in the two villages are social aspects with a value of 3 and economic aspects with a value of 2.4.
Evaluation of fire safety maintenance of an educational laboratory facility
Authors: Novanandini E R , Dewi O C , Nugroho Y S
Published: December 2021

This paper aims to evaluate fire safety systems of educational building laboratories by exploring the passive, active systems, and fire safety management. The evaluation was carried out in the University Integrated Engineering Lab in Depok City based on the applicable standards and regulations in Indonesia. Educational laboratories require a high-level safety measure against potential fire hazards due to the nature of the activities and equipment used. A reliable fire protection system and fire safety maintenance program are required to provide a comprehensive safety working environment. Lack of maintenance of fire safety systems is one of the causes of fires in educational laboratories. Triangulation methods consisting of field observation, interview, and document review were applied in this study along with descriptive and comparative analysis. Measurements by means of AutoCAD and Dialux simulation were carried out to support the evaluation process. The results show that the main features of the fire safety systems are installed in these laboratories according to the applicable standards and regulations. However, this study reveals that it is necessary to repair the walls, rearrange the sprinkler’s head spacing, add fire extinguisher, sort waste, and establish a fire emergency response team and safety organization.
The development of structure in the limasan- and joglo-style vernacular houses after the 2006 Yogyakarta earthquake
Authors: Rini J A , Idham N C
Published: December 2021

After a great earthquake hit the Special Region of Yogyakarta, Indonesia, in the year of 2006, some of the owners of the limasan- and joglo-style vernacular houses rebuilt their houses according to the education they received about the principles of earthquake-resilient building. This study investigates the structural development on the 11 (eleven) houses located in the Kabupaten (district) of Bantul, which was among the areas most affected by the earthquake. The owners combined the existing wooden main structural frame withstanding the earthquake with the new reinforced concrete structural frame. The owners also conducted various structural enhancements perceived as increasing the safety against possible future earthquakes. Despite this perception of future safety, in reality some of the owners’ practice were not in accordance with the principles of earthquake-resilient buildings. This study also revealed the practice of combining two naturally different systems: the flexible wooden structural frame and the rigid reinforced concrete structural frame.
The Spatio-temporal Tectonic Condition and Microzonation Map of Malang Region after the 2021 M6.1 Malang Earthquake for Disaster Risk Mitigation
Authors: Muntafi Y , Nojima N
Published: December 2021

The M6.1 earthquake which hit Malang and its surroundings in 2021 resulted in fatalities and over 10,400 damaged houses. Several seismicity studies have been carried out for Malang region, but no specific studies have implied the M6.1 Malang earthquake yet. This study addresses such gap by investigating the Spatio-temporal b-value of Gutenberg-Richter Law and generating the microzonation maps of spectral acceleration by considering the effects of the M6.1 Malang earthquake. The earthquake data compiled from the national and international earthquake catalogs were homogenized into a moment magnitude scale. The b-value analysis was calculated using the Maximum Likelihood method and spatio-temporal mapping. Several ground motion prediction equations (GMPEs) were selected for subduction and shallow crustal earthquake sources to generate probabilistic seismic hazard analysis (PSHA). PSHA was conducted using the 2% probability of exceedance in 50 years. The results show that the b-value after the M6.1 Malang earthquake still tends to decrease, indicating a relatively-high stress level which accommodates the potential for large earthquakes in the future. The microzonation maps for Malang region show that the southern part of Malang has a higher spectral acceleration value than the others. Therefore, these findings can be considered in the future disaster mitigation plan.
Directing Housing Developments for Achieving Earthquake Disasters Safety in Indonesia
Authors: Idham N C
Published: December 2021

The high number of fatalities and damage to buildings in the areas most affected by the earthquake should affect how to build houses. Especially in the case of self-housing, the community’s trauma will immediately encourage them to increase the safety of their buildings. However, early studies do not confirm so. Although it looks pretty built concerning the earthquake, the number of self-help houses found in post-disaster construction shows that concern for structural safety is still below expectations. This paper examines how safety precautions affect the way people build their homes. We discussed current housing developments geared towards earthquake vulnerability in Indonesia and found that housing security, in general, is still far from expectations. Learning from many post-disaster cases informs us that we must take radical and massive action regarding housing schemes and building structures to reduce the toll caused by destructed weak houses under every hit of an earthquake.
Induced Bank Filtration: Hydraulic Testing of Pilot Filters
Authors: Schelling M , Boving T B , Patil K
Published: December 2021

Hydraulic tests were performed on two pilot scale filters as part of a water treatment project in the village of Nersa, Karnataka, India. The filters use locally sourced alluvial material to filter E.coli contamination using natural processes that mimic those in Riverbank Filtration (RBF). Two pilot scale filters were tested, one containing locally sourced granular activated carbon (GAC) and one without. A falling head test and tracer test were preformed, and breakthrough curves were used to analyze the hydraulic performance. E.coli data were also collected, and percent removal was calculated to determine the effectiveness of the filters. Relative to the influent water, the E.coli removal percentage of Filter 1 (no GAC) was consistently high and ranged between 97.1% and 100% E.coli. The addition of GAC did not improve performance in this study. Overall, the effectiveness in bacteria removal observed in the non GAC filter warranted construction of a full-scale system.
Risk level mapping of organophosphate pesticides application in agricultural area of Cangkringan Subdistrict, Yogyakarta, Indonesia
Authors: Rahmawati S , Wacano D , Erpinda M , Juliani A
Published: December 2021

Farmers in Indonesia widely use organophosphate pesticides (OPPs) to increase crop production, despite their risk to human health and the environment. Objective of this study is to estimate the loading rate and risk level of OPPs based on OPPs characteristics, farmers’ knowledge, and the behavior of OPPs application in agriculture area in Yogyakarta Special Region in Indonesia. Data collected through interview and questionnaire distribution revealed three types of OPPs used in study area; profenofos, chlorpyrifos and diazinon. Data on application dose and crop area were used to estimate loading rate. Risk scores can be calculated by multiplying loading rate with toxicity data of each type of OPPs used. Box-Cox transformation was then used to normalized rightly skewed risk score data to get 4 (four) levels of risk classification range; low, medium, high and very high. It was found that there were areas classified as very high risk in wet season, while it is not the case in dry season. However, in total loading per year, areas with high and very high risk level were found for more than >50% in study area.
Groundwater Mapping of Total Coliform Contamination in Sleman, Yogyakarta, Indonesia
Authors: Ekarini F D , Rafsanjani S , Rahmawati S , Asmara A A
Published: December 2021

Groundwater is a pivotal resource to supply clean and drinking water besides surface water. In Indonesia, there are various issues regarding groundwater quality and quantity. By increasing population growth has an impact on groundwater quality, such as generated pathogen contamination. To prevent groundwater pollution was used sanitation facilities were called communal WWTPs. Unfortunately, most WWTPs were not performing optimal, and some had already stopped operating. This study aimed to display groundwater quality using the Inverse Distance Weighting (IDW) for 2018 to 2019 in the Sleman Region of Yogyakarta Province. The spatial analysis was completed by observation and interview methods. The total coliform number was measured from 29 monitoring wells. The results explained that compared to 2018, groundwater quality in 2019 showed a decrease in contamination by pathogenic bacteria. Groundwater flows also shown the spread of contamination from north to the south area. The distance between monitoring well and septic tank or WWTPs outlet, depth, and the physical condition were substantial factors for spreading the contamination.
GIS-based NNA and Kernel Density Analysis for Identifying Distribution of Restaurant’s Popularity Index in Bandung
Authors: A’idah S S , Susiloningtyas D , Shidiq I P A
Published: December 2021

With the advancement of information and communication technology, geographic information systems (GIS) also grow. The existence of GIS allows problems to be solved as much as possible by paying attention to the surrounding space. GIS applications have been widely applied in everyday life including in the culinary field. The existence of GIS in the culinary field can make it easier to find location information where a restaurant is located and find out how the restaurant’s popularity index is. This research focuses on using NNA and KDA to analyze distribution patterns formed from each classification of restaurant popularity index in Bandung and the density of the restaurant point. Restaurant data containing restaurant names, restaurant addresses, restaurant types, food types, and restaurant popularity indexes were obtained from Zomato using Zomato’s Application Programming Interface (API). The result of this research are spatial distribution pattern of the high, medium, and low popularity restaurants in Bandung City showing the same characteristics, clustering and has a large density in several sub-districts.
The Effect of Concentration of Tobacco (Nicotiana tabacum) Extract on Growth Parameters of Rice (Oryza sativa) Inpari-32
Authors: Sumardi D , Bahariawan M , Maulani R R , Suhandono S , Novia C , Harahap A F P , Gozan M
Published: December 2021

Rice plants (Oryza sativa) are a significant food crop. Tobacco plants (Nicotiana tabacum) can be beneficial and affect growth due to allelochemical content. The srudy aims to determine the effect of tobacco extract (N. tabacum) on the growth and yield of rice (O. sativa) Inpari-32 variety. The study method used the RBD as an experimental design. Three treatments with different concentrations of tobacco extract and one control with three replications. Growth variables were observed: growth rate, plant height, number of tillers, number of leaves, shoot and root dry weight, flowering age, and phytohormones. Observations of the harvest stage include the weight of stover, number of panicle seeds, the total number of tillers, weight of 1000 seeds, the ratio of the weight of filled grain, and productivity (tons/ha). The results showed that although not significant, tobacco extract treatment increased the number of tillers and leaves, the content of phytohormon IAA in the vegetative phase, the content of GA3 in the generative phase, shoot-root ratio, number of tillers, and accelerated flowering age. The implication of tobacco extract positively affects the plant growth variable and accelerated flowering age of rice variety (O. sativa) Inpari 32.
Waste Management in Jakarta Recycle Centre: Case Study of Pesanggrahan, Jakarta
Authors: Muhashiby M I N , Hasibuan H S , Wahyono S
Published: December 2021

Waste management is collecting, transporting, processing, and recycling waste materials from the Household, 3R Waste Management Site/Integrated Waste Management Site, and the landfill. Optimal waste management can reduce the impact of environmental pollution caused by waste. The current community paradigm in waste management is still in the collect-transport-dispose. This paper describes how Pesanggrahan District manages its waste by applying a new paradigm, namely reduce-sorted-processing. This paper aims to evaluate the waste management system at the Jakarta Recycle Center (JRC), Pesanggrahan, South Jakarta, and identify peer-reviewed documents in the waste management system. This study approaches a semi-systematic review by reviewing relevant documents. The waste transportation scheme carried out in the JRC program is divided into four types on seven different days. The composition of the most significant waste in JRC is organic waste. Two methods carry out the processing of organic waste, namely composting and BSF. With the support of sufficient waste transportation and processing facilities from the government, the JRC can become a pilot program that can be applied in other areas in managing their waste.
Sustainable Palm Oil and Landscape Program
Authors: Chalil D , Barus R
Published: December 2021

Palm oil is a commodity with a significant land area development. Thus, raises concerns about its impact on the landscape. This study uses a case study in South Tapanuli, a center of smallholder oil palm plantations with a high conservation value and an action plan for a sustainable palm oil program. This study uses a combination of a desk study of government publications and interviews with key stakeholders. The results show that the sustainable palm oil program can affect landscape sustainability through regional development and spatial plans. The sustainable action plan has altered strategic issues in the regional development plan by focusing on oil palm plantations management in forest areas. However, the strategic issues have has not been followed up by targets and programs. Coordination between the central and regional governments is lacking, and related local government organizations do not fully understand the plan. The annual plan has been completed with sufficiently detailed outputs and thus cannot use it as a reference for evaluating achievement stages. Therefore, although the sustainable palm oil program positively impacts regional planning in South Tapanuli, it still needs to be followed up by operationalization in synergistic programs.