Jatigede Reservoir in Sumedang Regency is a land mass planning designed as a multi-function reservoir. The main water source for this reservoir is from Cimanuk River, which flows through Garut Regency, and has many industrial activities around the river flow. This research was conducted to assess the trophic status of water pollution in Jatigede Reservoir by utilizing plankton as a bioindicator agent. Samples were collected from 9 observation stations from November 2018 until January 2019. The results showed that 26 species of phytoplankton from 7 divisions including Dinophyta, Cyanophyta, Chlorophyta, Chrysophyta, Euglenophyta, Bacillariophyta, and Charophyta was found in Jatigede Reservoir at about 461 ind/m3. Zooplankton abundance of 6 species from 2 divisions of Rotifera and Copepoda at 2 ind/m3. The average phytoplankton diversity index was 0.93 and zooplankton diversity index was 0.23. The average phytoplankton evenness index was 0.44 and zooplankton evenness index was 0.24. The average dominance of phytoplankton was 0.58 and dominance of zooplankton was 0.25. Based on the plankton community structure, the trophic status of Jatigede Reservoir was classified to moderate polluted (eutroph) to heavily pollutants (hypereutroph). The dominant species was Perinidium sp from Dinophyta division.
With the analysis of the value of condition the bridge, it aims to ensure that the bridges are on the road network are safe for road users.The method used for analyzing bridge condition values ??is the Bridge Management System (BMS) method which has become a general reference for bridge inspections in Indonesia. The Bridge Management System (BMS) method makes it easier to assess bridge conditions to identify damaged elements and structures. So that proper handling of bridge maintenance or repair is obtained. This was done as an effort to maintain optimal bridge performance
Sungai cicadas merupakan salah satu bagian dari sub DAS sungai Citarum di Jawa Barat yang berada ditengah Kota Bandung, sebagai sungai yang mengalir di tengah kota bandung dibangun kirmir dan tanggul untuk mengendalikan aliran sungai dan struktur ini memainkan peranan yang sangat penting dalam menghadapi genangan banjir, struktur ini sewaktu waktu dapat mengalami kerusakan oleh berbagai mekanisme pemicu hingga mempengaruhi umur efektif dari kirmir dan tanggul, yang mengakibatkan umur bangunan air tersebut yang diperkirakan fungsinya bertahan lama menjadi berkurang, bahkan kemungkinan umurnya bisa berkurang setengah dari waktu yag direncanakan. satu mekanisme yang bisa saja menjadi pemicu tanggul mengalami kerusakan ialah fluktuasi tekanan aliran air yang meyebabkan kerusakan pada tanggul dan tebing sungai, oleh sebab itu diperlukan penelititan analisis dan kajian kerusakan tanggul sungai akibat pengaruh fluktuasi tekanan aliran air banjir pada saat musim penghujan di sungai cicadas, Penelitian dilakukan dengan tinjauan objek permasalahan secara langsung dan eksperimen hidraulis yang menjadi kajian penelitian . Tinjauan objek secara langsung bertujuan untuk mengamati permasalahan, mengumpulkan sejumlah besar data berupa variabel, unit, individu dalam waktu yang bersamaan. Dari hasil Penelitian didapat fluktuasi tekanan aliran mengakibatkan kerusakan tanggul, keruntuhan tebing dan angkutan material. Semakin tinggi debit aliran yang diberikan, semakin besar kerusakan dinding yang terjadi. Hal ini menimbulkan gerusan dan endapan yang cukup besar.
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