Sri Sangkawati
Jurusan Teknik Sipil FT. UNDIP Jl. Prof. Soedarto SH. Tembalang, Semarang 50275

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PERENCANAAN BENDUNGAN MATENGGENG DI KABUPATEN CILACAP Frangky Arfan Pangaribuan; Bernard Septian; Sri Sangkawati; Sutarto Edhisono
Jurnal Karya Teknik Sipil Volume 3, Nomor 1, Tahun 2014
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Abstract

One of the efforts to develop the potency of Cijolang River is with making a dam  at Matenggeng Village, Dayeuhluhur Subdistrict, Cilacap Regency. The first step to design Matenggeng Dam is hidrology analysis such as: dependable discharge, water requirement and flood discharge. The dam is projected to supply water requirement in eight subdistricts, water requirement for irrigation which has 7,175 ha of areas and hydroelectric power. Dependable discharge is Q 90%. Flood discharge plan of The Matenggeng Dam is calculated from rainfall data and the result of flow is 1,876.756 m3/s which taken from HSS Gamma 1 with Q100. Matenggeng Dam is designed with rock fill dam type. The height of the dam is 82.5 meters with slope ratio 1:2.5 at the upper course and 1:2.25 at the lower course for 50 years lifetime and storage capacity 56 million m3. The spillway design is choosen with overflow type and  takes 30 m of wide with stilling basin (USBR Type II) which use 28 x 73 m as the dimension. The diversion tunnel design takes 550 m of length and 4 m of diameter. The cost of Matenggeng Dam Project  is about Rp 568,959,000,000.00 (Five Hundred Sixty Eight Billion Nine Hundred Fifty Nine Million Rupiahs) with 48 weeks as time target of this project.
PERENCANAAN KOLAM RETENSI DAN STASIUN POMPA PADA SISTEM DRAINASE KALI SEMARANG Muhammad Dwi Prayoga; Rizky Tegar Wicaksono Agami; Sri Sangkawati; Sugiyanto Sugiyanto
Jurnal Karya Teknik Sipil Volume 2, Nomor 2, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Abstract

Drainage system with retention pond and pumping station is the most effective and efficient system to manage flood in drainage area. Semarang River catchment area has became one of important area in Semarang, because it ends near Tanjung Mas Port, that is basically one of central business district in Semarang, so that the flood which inundate that area become major problem for local government. Retention pond and pumping station drainage system are designed using 10 year return period flood discharge. From the result of 10 year recurrence interval rainfall data processing by using Nakyasu method, thus can be obtained Q design = 63,983 m3/sec, that  will be used to design drainage channel. By comparing existing drainage channel and designed drainage channel, it’s obtained that drainage channel in M.H. Thamrin Street and Gajah Mada Street need to be replaced, because they can’t intercept and retain flood discharge. By using flood routing method with 10 year recurrence interval Q, it can be obtained the area of retention pond  is 68.000m2 and 88.400m3 with  8  pumps in total with 5 m3/sec capacity for each pump.
PERENCANAAN PLTA UNDIP II, SEMARANG Yudhi Putra Wira Negara; Cahyarsi Murtiaji; Joetata Hadihardaja; Sri Sangkawati
Jurnal Karya Teknik Sipil Volume 2, Nomor 2, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Diponegoro University as an educational institution has an important role as a contribution and dedication to the community in the conservation and development of water resources. With the location of the campus UNDIP Tembalang located in high elevation areas, plus there is a river flowing in front of the campus UNDIP, supported by intellectual property owned civitas academy UNDIP then the potential is more than enough to mengembangangkan and utilize all its potential for the benefit of conservation of water resources and hydropower plant. Hydroelectric power (hydropower) is one of the power plants that use renewable energy in the form of water. One advantage of this generator is a fast response so it is suitable for peak load conditions or when there is interference in the network. In addition to the output power capacity of the greatest among other renewable energy, hydro power has also been there since time immemorial. Debit design of UNDIP II Hidropower Plant Semarang using the mass inflow curve for 11 years (2001 s/d 2011) the results was 0.152 m3/second,, but to get the most power capacity used 0.220 m3/second discharge of hydrologic analysis calculations. Design structures to support the planned hydropower operations in order to function properly is building decision (Intake), rapid pipe, door arrangements, turbine, sewer, and draft tube. The results of the planning details are as follows: (1) using a type intake tower with a diameter of 0.83 m at an elevation of +147.05 (2) Penstock with a diameter of 0.83 m and a total length of 150 m and is connected to the intake hole at an elevation of +139 , 00. (3) High net falls 42.25 m. (4) The power generated by 77,51 kW. (5) door controller using 500x250x10 Canal profiles. (6) used the Turbine Turbine type Francis. (7) The sewer masonry trapezoidal cross section times the size of b = 0.7 m, h = 0.4 m. Review and Planning UNDIP II Hydropower plant cost of Rp 56.857.829.520.98 (fifty-six billion, eight hundred and fifty-seven million eight hundred twenty nine thousand five hundred twenty dollars) with a long time of the 25 weeks.