PERENCANAAN CHECK DAM KALI GUNG KABUPATEN TEGAL
ABSTRACT: Gung watershed is
part of the watershed which located in Tegal regency with an area of 45.65 km2
where Gung River as its main river . Gung river conditions at this time had a
reduction in the flow of flood discharge due to reduced cross-sectional area of
the river (river capacities) due to sedimentation . The main cause of the high
rate of sedimentation is the destruction of water catchment areas and land
management less attention to the principles of conservation land . Therefore it
is very necessary management effective river drainage area with emphasis on the
conservation and protection of the land (in particular critical area) and
water, especially in the upstream of the river. One of the countermeasures for
erosion and sedimentation problems in this river is by building sediment
control structure or so-called check dam . From the calculations have been
done, check dam was designed to have the following features: spillway crest of
the main dam at El. +431.500 m, 4 m dam height and 3.2 m foundation depth,
bottom width obtained by 20 m, flood design discharge with 50 years return
period was 502.368 m3/sec, height of wing crests was 6.469 m at El.+437.969 m
with 1.0 m freeboard, construction of the main dam was stone masonry; spillway
crest of the sub dam at El.+429.000 m with 1.5 m height and 2.5 m foundation
depth, height of wing crests was 6.567 m at El.+435.567 m with 1.0 m freeboard,
construction of the sub dam was stone masonry. The apron elevation was
El.+427.500 m with 1.8 m thickness. The apron protection was concrete in
quality K 175 with 1.5 m thickness (bottom layer) and quality K 225 with 0.3 m
thickness (upper layer/blanket).
Penulis: Anwar Eko Yulianto,
Yunus Jonatan, Sutarto Edhisono, Abdul Kadir
Kode Jurnal: jptsipildd140492
