Community participation refers to the active involvement of citizens in various stages of the development process, especially at the village level. A concrete example of community participation can be seen in the case study of Bendhung Lepen, located in Mrican Village, Yogyakarta. Bendhung Lepen is an irrigation canal that stems from the Gajah Wong River. Before its revitalization, the area faced numerous environmental problems, primarily due to household waste and pollution that contaminated the waterway and negatively affected the environment and public health. In response to these issues, local residents, along with relevant stakeholders, initiated an environmental conservation program. The main goal of this initiative was to restore the ecological function of Bendhung Lepen and transform it into a clean, green, and beneficial public space for the community. This study aims to measure the level of community participation in the environmental conservation program. Data collection methods included questionnaires for quantitative analysis and in-depth interviews for qualitative insights into community involvement. The results of the study show that community members were actively involved in various phases of the program, including planning, implementation, and evaluation. Stakeholders involved in the program included community leaders, youth groups, environmental organizations, and village officials. The forms of participation extended beyond voicing aspirations to contributing labor (through mutual cooperation) and materials (such as donations or supplies). According to Arnstein’s ladder of participation, the level of community participation in this conservation program falls under the category of "delegated power," which represents a high degree of participation. This means that the community was not merely involved as passive participants but was given real authority in decision-making and program management. These findings indicate that genuine and sustained community involvement plays a crucial role in the success of local environmental conservation efforts.

Gorontalo Province is an area with a high level of disaster vulnerability, both from hydrometeorological disasters such as floods and landslides, as well as geological disasters such as earthquakes. This condition requires an integrated, modern, and sustainable disaster training facility. Unfortunately, until now Gorontalo does not have a representative disaster management education and training center to support community preparedness. This research aims to design a Disaster Management Education and Training Center that not only functions as an education and simulation place, but also integrates green architecture principles to create an environmentally friendly and energy-efficient learning environment. The method used is qualitative descriptive with primary data collection through observation, interviews with stakeholders, and field documentation. Secondary data were obtained from literature studies, disaster architectural precedents, and spatial planning regulatory studies. The design site was chosen in Limboto District with considerations of accessibility, development potential, and geographical conditions. Analysis is carried out on spatial, functional, and climatological aspects to produce an optimal zoning concept and the orientation of building masses according to the tropical climate. The design results show that an area of 19,371 m² can accommodate all space needs with the utilization of KDB of 25.4%. The application of green architecture is realized through the use of environmentally friendly local materials, natural lighting, cross ventilation, solar panels, and rainwater management systems. The simulation facilities for floods, landslides, earthquakes, and fires are designed based on experiential learning so that participants can experience disaster scenarios firsthand. This design is expected to be a model of sustainable tropical disaster architecture, replicate in other disaster-prone areas, and encourage the creation of a disaster-aware culture. This research also opens up further research opportunities related to energy performance evaluation and the application of digital technology in disaster education.

The design of Lecturer Housing for Campus 4 Gorontalo State University is a strategic necessity in line with the expansion of educational institutions and the increasing number of educators requiring adequate and proximate housing. The primary objective of this research is to produce a lecturer housing design that is not only adaptive and sustainable, but also harmonized with the Regional Spatial Plan (RTRW) of Bone Bolango Regency. The research methodology encompasses a comprehensive site analysis, examining aspects such as climate conditions, topography, vegetation patterns, infrastructure and utility networks, ambient noise levels, and site accessibility. Furthermore, a zoning and spatial relationship study was conducted to determine effective space allocation based on the principles of tropical architecture and green building practices. The findings of the study highlight that a north-south building orientation significantly reduces heat absorption, while the integration of cross-ventilation strategies enhances natural airflow and thermal comfort. Spatial zoning into public, semi-public, private, and service areas allows for organized layouts and promotes social interaction among residents. Sustainability is reinforced through the application of green architectural technologies, including the use of green concrete, lightweight steel frameworks, solar energy panels, as well as integrated waste-water management systems that separate black water and grey water. Landscaping elements, both softscape and hardscape, are utilized to enhance aesthetics while supporting ecological balance and rainwater absorption. This design proposal contributes to the broader discourse of sustainable tropical housing and may serve as a replicable model for future lecturer housing projects in similar regional contexts. It emphasizes the importance of environmentally responsive, cost-efficient, and socially supportive residential architecture.

This study aims to compare the level of carbon monoxide (CO) air quality in Green Open Space (GOS) and Non-Green Open Space (NGOS) along the Abepura–Sentani main road in Jayapura City. The research was conducted in two locations: the Taman Makam Pahlawan Denzipur Waena (GOS) and the front area of Mega Waena (NGOS). CO levels were measured using a CO smart sensor over a period of one week, with measurements taken in the morning, noon, and afternoon at six sampling points. The findings indicate that CO concentrations are significantly lower in GOS areas compared to NGOS areas. The presence of vegetation in GOS helps reduce CO pollution by acting as a natural filter. These results highlight the importance of maintaining and developing green open spaces in urban areas as part of efforts to reduce air pollution and improve public health.

The synthetic unit hydrograph methods of Nakayasu, HEC-HMS (Snyder), SCS, ITB-1, and ITB-2 are used to calculate peak discharge and flood hydrograph shape in this Kadumalik Dam study. The maximum daily rainfall data analysis used the Thiessen Polygon and Arithmetic Mean methods. Of these two frequency analysis methods, the Thiessen Polygon method was chosen. Rainfall transformation into runoff using the FJ MOCK and NRECA methods has been applied in the Kadumalik Dam analysis. Compared to NRECA, the FJ MOCK method with the Thiessen Polygon method for frequency rainfall analysis provided a better performance rating with calibration values of 0.911 for R2, 0.627 for NSE, 0.606 for RSR, 18.141 for RMSE, and 30.764 for PBIAS. The validation values were 0.911 for R2, 0.661 for NSE, 0.582 for RSR, 16.086 for RMSE, and 34.420 for PBIAS. The Kadumalik Dam uses a side-channel spillway model with an ogee spillway crest type. Technically, it is planned based on the design flood discharge Q100 and controlled by discharging the flood discharge Q1000 and QPMF. The purpose of this study is to determine the hydraulic flow behavior that occurs in the numerical model based on CFD with ANSYS Fluent and CFX, along with Flow 3D in the diversion, regulation, and launching channels, to obtain the optimum design of the structures, where the flow classification is steady and transient. From the numerical analysis results, it was found that the water velocity streamline in the launch channel for Q100 with steady flow is 0.1644 – 0.2643 m.s-1, for Q1000 it is 0.2176 – 0.2869 m.s-1, and for QPMF it is 0.1592 – 0.2262 m.s-1. For transient flow, the water velocity streamline in the launch channel for Q100 is 0.1555 – 0.2250 m.s-1, for Q1000 it is 0.1541 – 0.2232 m.s-1, and for QPMF it is 0.1559 – 0.2255 m.s-1. Wet, normal, and dry hydraulic conditions are used in the analysis of the Kadumalik Dam operation pattern. The wet hydraulic condition before the reservoir had an average discharge of 25.51 m3/s, and after the reservoir, the average discharge was 26.89 m3/s, an increase of 5.125%. The normal hydraulic condition before the reservoir had an average discharge of 15.54 m3/s, and after the reservoir, the average discharge was 18.75 m3/s, an increase of 17.105%. The dry hydraulic condition before the reservoir had an average discharge of 1.74 m3/s, and after the reservoir, the average discharge was 7.97 m3/s, an increase of 78.157%.

Oil and gas industry activities have the potential to produce high carbon emissions, so Green Open Space (RTH) is needed as an effort to mitigate environmental impacts. Shrub vegetation that grows in RTH areas requires routine maintenance, but this process produces vegetation waste that has not been studied quantitatively. This study aims to analyze the generation of shrub vegetation waste using a sampling method as a basis for sustainable waste management planning. The method used is sampling on a 1 m³ cube-shaped plot in three locations with different vegetation characteristics. Cutting is done manually using simple tools, then the waste produced is put into a measuring box to calculate its volume. The results show that sample point 1 produces 1.00 m³, sample point 2 is 0.50 m³, and sample point 3 is 0.30 m³. The average volume of shrub waste generation is 0.60 m³ per square meter. This data is important for planning the capacity of equipment, labor, and temporary waste disposal locations. In addition, the characteristics of waste that is easy to dry and has a high organic content opens up the potential for reuse as compost or biomass. This method has proven to be effective and efficient in supporting environmentally friendly vegetation waste management strategies as well as part of compliance with environmental regulations such as PROPER.
 
 

Tenure conflicts in forest areas are long-standing structural issues in various regions of Indonesia, including Popayato Sub-district in Gorontalo Province. These conflicts arise from overlapping land claims between local communities, companies, and the state, directly affecting the socio-economic and ecological conditions of surrounding populations. This study aims to analyze the social and environmental impacts of tenure conflicts in Popayato's forest areas and assess the roles of stakeholders in seeking sustainable solutions. A qualitative case study approach was applied through in-depth interviews, field observations, and thematic analysis. Findings reveal that communities face restricted access to productive land and forest resources, disrupting livelihoods and local cultural sustainability. Ecologically, tenure disputes have triggered illegal land clearing and significant forest degradation. Local governments have made mediation efforts, yet face challenges in coordination and policy inconsistency. Civil society organizations play a crucial role in advocating community rights through participatory mapping and the promotion of legal recognition via social forestry schemes. This study recommends resolving tenure conflicts through collaborative approaches that uphold principles of social and ecological justice, including strengthening local institutions, participatory boundary mapping, and developing inclusive conservation-based business models. In doing so, sustainable forest management can be achieved by recognizing local rights and enhancing community participation in decision-making processes.

Terminals serve as transportation nodes that play a vital role in supporting community mobility and urban economic activities. As the capital city of Papua Province with a population of 420,577 inhabitants, Jayapura City requires an efficient transportation system to support increasingly dynamic social and economic activities. Entrop Terminal, as a Type A Terminal and the main transportation hub of Jayapura City, serves various transportation modes ranging from inter-city inter-provincial transport, cross-border transport, intra-provincial inter-city transport, urban transport, to rural transport. However, there is a significant problem where users prefer to wait for public transportation outside the terminal due to long queues inside the terminal, creating a shadow terminal phenomenon. This research aims to evaluate the facilities available at Entrop Type A Terminal in relation to the quality of services provided to users. This evaluation is important to identify facility and service deficiencies that cause users to be reluctant to use the terminal optimally. The research results are expected to provide recommendations for facility improvements and service quality enhancement at Entrop Terminal, so that it can function optimally as the main transportation hub and reduce the shadow terminal problems occurring in Jayapura City.

Housing in the BSB (Bukit Semarang Baru) area, located right in front of the lake, offers an architectural idea that combines the comfort of modern housing with a natural touch. In this analysis, several important architectural elements such as the use of foot plate foundations, construction time, and the use of wood planks on the building facade are explored to understand how this design combines functional and aesthetic aspects. This study aims to analyze these elements, especially in relation to spatial planning, functionality, and aesthetics, as well as how the integration between building architecture with the elements of the lake and the surrounding green space. Through a qualitative approach and direct observation, this paper offers a critical view of the concept of sustainability applied in the design of this area.

Sentani Kota Village as a strategic area experiences significant pressure due to population growth and economic activities, facing complex problems including the conversion of agricultural land and forests into residential and commercial areas, low public awareness about sustainable spatial planning, and weaknesses in law enforcement and supervision. This condition potentially threatens the environmental sustainability and ecosystem of Lake Sentani. This study aims to evaluate the suitability of spatial utilization in Sentani Kota Village, Sentani District, Jayapura Regency, focusing on two main issues: the level of conformity between existing spatial utilization and the Regional Spatial Plan (RTRW) guidelines, and the factors that support and hinder the effectiveness of RTRW implementation. Conducting overlay analysis of existing conditions and spatial pattern maps, complemented by field verification at 28 observation points and stakeholder interviews with the Spatial Planning Agency. The results show that 76.5% (2,759.07 hectares) of spatial utilization conforms to RTRW guidelines, while 22.9% (825.98 hectares) remains non-conforming, and 0.6% (21.66 hectares) violates regulations. Supporting factors include routine monitoring protocols, high conformity levels in designated areas, firm enforcement actions, and community leadership involvement. Conversely, hindering factors encompass low public compliance, non-conforming zones prone to violations, inconsistent enforcement responses, various types of violations, limited sanction mechanisms, and inadequate preventive measures. This study recommends targeted enforcement in critical zones, transition planning for non-conforming areas, lake buffer zone management, enhanced community participation, and systematic monitoring protocols to achieve more effective spatial utilization control.