<p>Sindang street, which is located in North Rawabadak Sub-district, Koja District, is one of the areas in North Jakarta Administrative City which is an area that is prone to flooding. Even though a working pump house is available, there are still puddles in several places. One of the problems that occur is the channel that drains water into the storage pool narrowing due to sedimentation in the channel. By analyzing the channel using the Log Pearson III distribution method using data obtained from the STA Tanjung Priok Rainfall Station, the rainfall intensity that occurs in a 5 year cycle is 170.748 mm, the Mononobe equation is used to find the intensity of rain per hour that occurs. Then it can be searched for the planned rain discharge using a Rational Method so that it is known that there are 2 channels, namely (P and Q) unable to accommodate the rainfall that occurs.</p>
Saluran PHB BGR Gading Kirana terletak di Jalan Raya Gading Kirana pada koordinat 6°08'37,9"- 6°10'14,2" Lintang Selatan, 106°54'09,6"- 106°53'16,2" Bujur Timur. Di daerah sekitar Saluran PHB BGR Gading Kirana masih sering terjadi banjir setiap kali musim hujan tiba karena jarak antar tali-tali air yang terbilang berjauhan, menyebabkan surutnya genangan air menjadi lambat serta terkadang saluran tali air mengalami penyumbatan, inilah yang menyebabkan banjir ketika air pada saluran di bawah trotoar tidak cukup mampu menampung volume air yang masuk. Dari kondisi diatas, maka perlu dilakukan analisis permasalahan banjir di daerah Saluran PHB BGR Gading Kirana untuk mengetahui apakah Saluran PHB BGR Gading Kirana masih dapat menampung debit air berdasarkan curah hujan 25 tahun terakhir dan apakah Saluran PHB BGR Gading Kirana perlu normalisasi. Berdasarkan hasil perhitungan manual dan aplikasi HEC-RAS, Saluran PHB BGR Gading Kirana tidak dapat menampung debit air berdasarkan curah hujan 25 tahun terakhir sebesar 46,95 m3/det. Pada titik 0 – titik 33 perlu dilakukan normalisasi dengan cara penambahan turap dari 4 m menjadi 5,5 m.
Kebutuhan energi terbarukan di Indonesia sangatlah penting, saat ini sumber energi terbarukan porsinya relatif kecil. BPPT ( Badan Pengkajian dan Penerapan Teknologi) dalam kegiatannya melakukan pembangunan pilot plant Biogas Pome setara 700 kW berkerjasama dengan PTPN V (PT. Perkebunan Nusantara V) dengan sistim tangki berpengaduk secara kontinu yang mana hasil gas tersebut dimanfaatkan sebagai bahan bakar boiler pabrik PMKS di sei pagar. Metode pemilihan pondasi tangki reaktor dengan kapasitas 2000m3, kami melakukan perbandingan perhitungan antara menggunakan free head atau fix head dengan memakai diameter 50cm dan 60cm dengan melihat banyaknya jumlah, diameter pile dan ketebalan mat yang digunakan. Diameter rencana tangki reactor direncanakan berukuran 16.8m dengan ketinggian 9m, dengan beban tangki sekitar 2174.2ton dan berdasarkan data dari soil test didapat nilai N-SPT di kedalaman 10-15m, untuk itu kami merumuskan bahwa fundasi pile yang kita pilih. Perbandingan fix and free head pada pile ukuran 50cm dimana perbedaan fix and free head 44 berbanding 65, dengan ketebalan mat foundation 1.1m berbanding 0.6m sedangkan dengan mengunakan diameter 60cm jumlah pile 32 berbanding 50 dengan ketebalan mat 1.3m berbanding 0.6m. Dari analisa tersebut dengan memperhatikan kekuatan dan keekonomisan maka dipilih pile dengan diameter 50cm dengan mengunakan free head.
The channel in the Buaran River area has a channel length of 5.32 km located in the Bukit Kencana Housing Area as the upstream of the Buaran River with the smallest cross-sectional width of 0.9 m and a height of 1 m and the border of the Jakarta Cikampek Toll Road as a downstream with a width of 2.2 m and a height of 3.6 m. one of the areas of the Buaran River which experienced quite severe flooding. This was due to changes or conversion of land functions which were originally water catchment areas to settlements. The large number of buildings that stand on the body of the river makes the current section of the Buaran River unable to function optimally in accommodating flood discharges, besides that there is no public awareness in protecting the environment which can be seen from the many piles of garbage in the body of the river. The purpose of this research is to find out how big the capacity of the existing Buaran cross-section is (starting from the Bukit Kencana Residential Area to the Jakarta Cikampek Toll Road) by modeling the existing cross-section using the help of the Hec-Rass application as well as recording and mapping locations that have the potential to flood. . One of the efforts that have been made by the government in controlling floods is by normalizing the river but in practice, the normalization of the Buaran River cannot be said to be running optimally. Based on hydrological calculations, the planned Q25 flood discharge is 16,307 m3/s. By using the help of the Hec-Ras application we can find out which river profiles need to be treated so that the handling of river normalization as an alternative to flood control can run optimally
The need for clean water quality has increased every year, especially in big cities in Indonesia. This is triggered by the high population growth which causes the need for clean water to be urgently needed. Lack of water catchment areas and green land exacerbates the amount of clean water. In addition, the cause of the decline in clean water quality is also influenced by the many negative activities carried out by humans, one of which is the activity of disposing of garbage in the river, reservoir / setu and drainage areas. The use of chemicals, namely Poly Aluminum Cholrid (PACPOWDER) in the processing of river water or river water requires high operational costs, which results in high costs for people who subscribe to PDAM. The filtering pattern of water can be done by referring to the soil layer in the form of an aquifer, so that the water that is not good can be filtered in the presence of an aquifer and can purify the water into drinking water. The use of artificial aquifers that have currently been carried out by the Ministry of Public Works is through rain, where through the filtration of rainwater containing acidic levels it can be neutralized through artificial aquifers into clean water and can be applied to areas of high drought levels.
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