PERENCANAAN SALURAN DRAINASE KAWASAN OASIS PT. DJARUM KUDUS DI KABUPATEN KUDUS
ABSTRACT: Drainage problems,
especially in the cities of Indonesia has become important with the frequent
occurrence of flooding or water logging
in the rainy season at urban areas that disrupt people life and obstruct transportations
fluency and cause property losses in large enough quantities. The main cause of
flooding or water logging is a change from the natural landscape into the
development environment, hence, increasing impermeable surfaces, such as roads,
parking areas, sidewalks, and residential areas. This change reduces, disrupts,
or eliminates the natural vegetation, land surface, basin, and natural drainage
pattern that prevents, vaporizes, stores, issues slowly and absorbs the
rainwater. The impact of changes in the landscape of OASIS Area of PT. Djarum
Kudus is the increasing direct runoff (run off) while reducing water seep into
the ground so that it can make the puddle of water. In its planning, the
hydrologic analysis using the 15 years of rainfall data in Sta. Kedung Gupit is
performed. In hydrologic analysis of this planning is applied the probability
distributions of Log Pearson type 3 and is used EPA SWMM program with 10-years
return period of flooding, thus, it is obtained the maximum flood discharge
before construction in the amount of 9.05 m3/second and the maximum flood
discharge after development in the amount of 16.69 m3/second. Based on the
results of that analysis, the planning of drainage canals is carried out. In
the planning, the used drainage canals are new drainage canals which are
constructed at the OASIS area of PT. Djarum Kudus. The dimensions of the
drainage canals that are used vary from the largest with the dimension of 2.5 m
x 3 m and the smallest with the dimension of 0.6 m x 0.6 m. Furthermore, to
determine the effectiveness of the drainage canals, it is modeled using HEC RAS
program. In the calculations using that program, all the canals that are
planned in the OASIS area of PT. Djarum are currently able to accommodate water
during the flooding for return period plan of 10 years. Planning areas OASIS
Drainage System PT. Djarum Kudus produces The dimensions of the drainage canals
that are the largest with the dimension of 2.5 m x 3 m and the smallest with
the dimension of 0.6 m x 0.6 m. The construction of drainage canals at OASIS
area of PT. Djarum Kudus takes time for 4 months with a total cost incurred is
9,490,131,000.00 (nine billion four hundred and ninety million one hundred and
thirty-one thousand rupiahs).
Penulis: Ardianto Wibowo,
Mohammad Yudhi Widyatmoko, Suseno, Sugiyanto
Kode Jurnal: jptsipildd140743
