KAJIAN PENANGANAN BANJIR SUNGAI BERINGIN SEMARANG DENGAN MENGGUNAKAN SISTEM LONG STORAGE
ABSTRACT: One of the
phenomenon of the river is flood, which is caused by the inability of the river
to accommodate the rain before it is streamed to the sea. Study location in
Beringin River area Wonosari Semarang City is being one of the areas that is
often experienced this. The negative impacts such as inhibiting people
activities, infrastructure damage, and paralysis of economic activity, making
this can’t be ignored. So, needed a handling effort to minimize or even prevent
flooding. In this final task, the flood control system that used is the long
storage which it is an extend reservoir on Beringin river area, Semarang. The
planning process of long storage begins with primary and secondary data
collection, and got 1993-2012 (20 years) rain data from 3 (three) different
rain stations which is Tugu station, Mijen station, and Mangkangwaduk station
with total of Beringin River area is 26,58 km2. Hydrological analysis which
includes determining rainfall average using Thiessen method, frequency analysis
with probability distribution, data testing using Chi-Kuadrat and
Smirnov-Kolmogorof, Intensity of the rain plan calculating using Mononobe and
ABM (Alternating Block Methode, and determining flood discharge plan using HSS
Gama I. And then hydraulic analysis with flood routing and backwater to
determining the needed of long storage capacity to plan the design of water
building and the components. The last is budget planning and job scheduling of
long storage. From hydrological analysis obtained with the maximum flood debit
for a period of 25 years m3/sec 216,897. Obtained from that debit of flood
water level +8,62. For the design of water building, including lighthouse weir
(spillway) 22 meters width, 3 units of drain floodgates each 1,5 meters width,
levees (retaining wall) 2 kilometers length, and bridge services.
Implementation is planned in 6 months at a cost of Rp 17.316.641.000,00.-. From
this Long Storage planning, it is expected to cope flood that occurred in
Beringin River area, Semarang.
Penulis: Muhammad Ficky
Meilaci Wibowo, Randy Arnatha, Suharyanto Suharyanto, Dwi Kurniani
Kode Jurnal: jptsipildd140491
