The impact of climate change in the form of rising temperatures, rising water levels, water pollution and extreme climate events are vulnerable to the potential of water resources in various sectors of life. The aim of this research is to build a method for managing water potential in river estuaries and arrangement the river estuary area for mitigation of the effects of climate change on water resources in the estuary area, especially in Bali. The method of this research is qualitative research on phenomenology that is happening. Data is collected in the form of primary data and secondary data. Primary data consists of environmental conditions in river estuaries related to climate change that occur, while secondary data in the form of water potential, water quality and land changes are obtained from various related instances. The results of the research found that watersheds on Bali Island are potential watersheds that can be used as raw water sources for both clean water and irrigation water. However, changes in land functions and climate change can cause some negative impacts on the potential and environmental conditions of estuary water resources such as floods, droughts, landslides, pollution of water by pollutants and sedimentation. Mitigation actions that must be taken to reduce the risk for the condition of water resources in river estuaries in Bali due to climate change are managing water potential by managing water systems, conducting water-saving campaigns, integrated management of water availability and needs, environment-based management, strengthening institutions in management of water resources, and the need to regulate cropping patterns right in the river estuary. While in terms of arrangement river estuary area there are several mitigation actions that can be carried out such as the construction of dikes around the estuary area, the construction of reservoirs, the construction of monitoring posts for river estuary conditions and the preservation of deforested areas around river estuary.

The construction of the Wolowaru Community Health Center in Ende Regency has been delayed. Delays in the duration of this project will have an impact on project costs which will get bigger. Therefore, an analysis of the accelerated duration of project implementation is needed so that the initial target can be achieved. This study applies the crashing method, namely speeding up the duration of each work item according to needs and calculations so as to avoid excessive delays. The application of this method is assisted by using the Microsoft Project 2013 with alternative working hours or overtime and work shift systems. The results of the analysis on the Wolowaru Community Health Center construction project in Ende Regency showed that the total project cost after carrying out an alternative of two hours of additional working hours was Rp. 8,371,332,720 and the duration of project implementation is 175 working days. This shows a fee that is 0.62% more expensive than the normal total cost and 20% faster than the normal duration. Then for the project cost after carrying out an alternative system of morning shifts and night shifts, it is Rp. 8,359,287,673 and the duration of project implementation is 156 working days. This shows a fee that is 0.48% more expensive than the normal total cost and 39% faster than the normal duration. From this study, it shows that the implementation of the work shift system requires cheaper costs with a shorter duration of work than the implementation of additional working hours in the Wolowaru Health Center development project in Ende Regency.

Performance assessment and preparation of AKNOP (operation and maintenance costs) were carried out on 13 reservoirs in the province of Bali, including Embung Badeg, Embung Batudawa, Embung Baturinggit, Embung Besakih, Embung Bukit, Embung Datah I, Embung Datah II, Embung Dukuh, Embung Muntig, Embung Seraya Timur, Embung Seraya, Embung Telung Buana, and Embung Untalan located in Karangasem Regency. The purpose of this study is to evaluate the reservoir performance against the specified assessment aspects and to obtain the planned operating and maintenance costs for the reservoir facilities and infrastructure based on the damage criteria. The evaluation of the operation performance and maintenance of the reservoir refers to the Circular Letter of the General Director of Water Resources, Ministry of Public Works and Housing. Meanwhile, the AKNOP value is calculated from the total of multiplication volume, frequency, and unit price of work for each reservoir operation and maintenance activity. The reservoir performance evaluation is based on four criteria, physical performance, operating and service performance, security and environmental system performance, and institutional performance. From the study, the result shows that 13 reservoirs' performances are in adequate condition. The operation and maintenance can be done by routine and periodic maintenance activities based on operating and maintenance cost plans. This activity is expected to reduce reservoir damage.

The Ayung river basin is the largest watershed in the Bali Penida River Region. The increase in population and the demands of a more viable livelihood have encouraged people to continue to strive to meet all their needs and the development of tourism in Bali that is growing rapidly, but behind that there will be a negative impact caused mainly on the river water environment and river estuary. For this reason, it is necessary to evaluate the environmental conditions of river estuaries and environmental arrangements to be able to support water needs and tourism activities. The purpose of this study was to create a model of water resources conservation at the Ayung river estuary based on ecotourism. The research method uses qualitative methods, which will integrate conservation of water resources that may be carried out in research areas based on ecotourism. The data used are in the form of primary data and secondary data where the primary data is in the form of observations directly to the location of the study and survey by interviewing the surrounding community about tourism activities in the research location. Meanwhile, secondary data in the form of water potential data, land use, topography obtained from survey and related agencies. The results of the study using the SWOT model obtained several alternative conservations that can be done based on ecotourism.

<p><strong>Aims</strong>: This research will provide an overview of the comparative analysis of watershed characteristics in Bali which are differentiated from watersheds flowing to the north, and watersheds flowing to the south of Bali Province. The aim is to determine the characteristics of each, and proper sustainable management for each watershed. <strong>Methodology and Results:</strong> This is a descriptive, quantitative research that analyzes and compares the characteristics of the Saba watershed and Unda watershed, where the characteristics analyzed are morphometric and hydrological.  From the analysis, it was observed that the Unda watershed, which has a flow direction to the south of the island of Bali, and the Saba watershed, flowing to the north of the island of Bali, possess several differences and similarities. The similarities include rainfall patterns, high temperatures, and the comparison values between Qmax and Qmin is significant. Meanwhile, the differences include the Saba watershed slope being steeper than the Unda watershed, and the Saba has young geomorphic features, while the Unda watershed possesses advanced geomorphic features. <strong>Conclusion, significance, and impact of study:</strong> Differences in watershed characteristics lead to differences in the management carried out. Furthermore, in terms of hydrology, where there are lesser differences, the sustainable management of the Saba and Unda Watershed also require conservation in form of a reservoir (weir or dam). This is to enable the storage of water in the rainy period for the dry season.</p><p> </p>