The Watusampu Water Coast was one of the waters affected by the tsunami waves on September 28, 2018. The height of the tsunami waves reached 6.6 meters and submerged as far as 71.4 meters inland. This study aims to see the bathymetry and tidal characteristics of Watusampu waters after the 2018 tsunami. The results of bathymetry measurements are corrected with tidal data. The results of tide measurements are compared with the predicted results and then analyzed by T-tide to calculate the tidal constituents used in the calculation of the planned water level in Watusampu waters. The bathymetry depth in the Watusampu waters ranges from 66.5 meters. The slope of the coastal waters has increased from north to south. The type of tide in Watusampu waters is mixed tides with a double daily inclination. The dominant tidal constituents are M2 and S2, respectively, with an amplitude of 0.5336 m and 0.4025 m. The tide wave height at the neap tide and spring tide is 0.2622 and 1.8722 m, respectively.

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The infrastructure development, especially the building, increase every year as each life sector also develops in national and regional level. Because of its importance function as of Sumbawa Regent Office as the community service center and the control center of Sumbawa Regency government, the building needs to have evaluation on the construction reliability to maintain its structural performance during the life time. The evaluation was started by collecting the secondary and primary data. The primary data was obtained by testing on the structural elements of column, beam, and floor slab using non-destructive. The results showed that (T) the natural vibration period of building structure with Model Using Roof (MDA) is 0.291 second and frequency (f) 3.438 Hz while Model without Roof (MTA) is 0.308 second and frequency (f) 3.244 Hz. The value of deflection between floors (story drift) were in the safe limits, and the level stability of building (stability ratio) θ < 0.1, therefor the effect of P-Delta could be neglected. The maximum horizontal deflection at the building separation between the main and wing buildings is about 0.90 cm on the Model MDA and 3.10 cm on the Model MTA, while existing separation is 1.5 cm. Accordingly, that building was categorized unsafe against impact when earthquake occurs on the Model MTA (SNI 03-1726-2012). The structure element strength of column, beam, and floor plate is in the safe condition.

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Industrial Revolution 4.0 in education emphasizes how to design new approaches to education so that students are prepared to navigate the flows of global change. Blended learning is a strategic instructional model developed in order to fulfill the industrial revolution 4.0 challenges. The present research aims to explore the design of blended learning model based on need analysis and intended to create a dynamic, engaging and student-centered learning environment for English Language Teaching (ELT). This research was a case study with survey method. The subject of this research consisted of the teacher, student and educational staff involved in implementing a blended learning model in higher education. Data collected by using in-depth interview, observation and documentation. Research results showed that the teacher applied various and different technologies in ELT such as edmodo, and WhatsApp. Moreover, the management of blended learning was still not optimal because of the limitation of teacher's experience and knowledge.