The development of urban areas often has an impact on changes in the surface run off area of water flow, a consequence that often occurs is flooding due to an increase in the value of run off drainage from housing/industries which burdens the capacity of urban land drainage channels. The analysis carried out is to calculate the value of the travel time (Tc) from the build area compared to the peak time (Tp) in the urban partial drainage flow. The value of time concentration is influenced by the slope of topography and watershed area of each rayon in Surabaya. The calculated Tc and Tp values will be combined to find the linear correlation value of the effect of watershed characteristics on development/change of land area in Surabaya. The results of the linear analysis of the relationship between the area of the build up area and the combined travel time in each rayon are not the same, this is due to the influence of land topographic slopes in each rayon and also the area of the watershed be different. the length of the channel on the drainage of urban area in each rayon have a separate drainage network sub system from one another. This is a consideration that the determination of the formulation of the relationship between the area of the build up area and the time and volume of the reservoir must adjust the characteristics of each rayon.

No abstract

Surabaya's located on the track of WS Brantas, particularly the downstream (Surabaya canal), wherein vulnerably to accident, such as inundation, sedimentation, and waste. In the matter of inundation management of Surabaya, one effort required to control the flood is sedimentation recording, related to the nature and characteristic of Surabaya canal. This process of sedimentation slowly shallow the riverbeds, hence reduce the wet-cross section or the width of the river, which furthermore can cause to an inundation if its debit of flow beyond its capacity. Concerning to explained-context above, it is considerably important to initiate a research about it. This study reviews sedimentation analyses and surveys held to Surabaya canal, to analyze the correlation between rainfall and discharge suspension and also its total number of suspension load. Those analyses made in order to have the estimation of sedimentation transportation exposed to annual average discharge, as a balance of waterflow volume of wetcross-section riverbeds (where the sediment laid). The result of this event will be used as a supporting data of disaster mitigation calculation of flood in the future. This research metodology commenced by the literature study, surveying and measuring, and sampling. Measurement result shows a correlation between discharge flow and suspension load of Surabaya canal, with a quite robust correlation coefficient, particularly at an discharge value is 0,248 m 3 /s descending value of concentrate sediment pops 20ppm, and spesific gravity value is following maximum at 2,767.

Desa Wirotaman merupakan salah satu desa terdampak bencana gempa bumi yang terjadi pada April 2021 lalu yang berdampak pada runtuhnya beberapa bangunan dan terganggunya sistem distribusi air bersih pada beberapa lokasi. Padahal, banyak ditemukan sumber mata air di Desa ini yang seharusnya dapat memenuhi kebutuhan warganya. Namun fakta nya, perolehan sumber daya air di desa ini masih belum merata seluruhnya. Beberapa wilayah mengalami kendala air bersih sehingga warganya harus berjalan menuju sumber mata air sambil membawa jerigen-jerigen untuk kemudian dibawa ke rumah masing-masing. Untuk itu, tim abdimas melaksanakan pemasangan pompa hidram pada salah satu sumber mata air di lokasi yang sulit mengakses air bersih untuk memperpendek jarak sehingga air lebih mudah diakses oleh warga. Selain itu, dilakukan pula pengukuran GCP dan pengambilan data citra menggunakan drone. Dari kedua pengukuran ini akan didapat peta orthophoto yang dapat dijadikan acuan dalam perencanaan jalur perpipaan karena memuat data elevasi dan koordinat wilayah.

The ever-increasing use of fossil fuels causes the climate to become unbalanced due to the resulting pollution. Renewable energy is gaining widespread adoption because it is more cost-effective and eco-friendly. Using water as micro-hydro power plants or PLTMH can be a viable alternative to non-renewable fuel sources. Indonesia is one of the countries with the greatest application potential for micro-hydro power plants or PLTMH, particularly in Batang Regency, Central Java Province. This study focused on reducing the use of fossil fuels as a source of electricity in Batang Regency by utilizing water resources. Environmental approaches and hydrological analysis were employed in this study to achieve precise and optimal PLTMH planning outcomes. The results of the analysis indicated that the total discharge required to operate the PLTMH turbine is 2.22 m3/s with an 80% mainstay discharge, while the design flood discharge is 113,679 m3/s (Q100year). Implementing micro-hydro power plants or PLTMH in Batang Regency could be the first step in Indonesia’s transition from fossil fuels to renewable energy sources.