Perencanaan Dispersion Dam di sungai Rejali yang
mempunyai luas DAS 3945 km ini berlokasi di desa Jugosari
kecamatan Candipuro Lumajang Jawa Timur dengan panjang
sungai utama 1868 km lokasi DAS yang berada dilereng
Gunung Semeru yang saat ini berstatus waspada yang artinya
memiliki potensi bahaya lahar dingin lebih besar dari pada ketika
berstatus normal. Kemungkinan terjadinya banjir lahar dingin
pada sungai ini sangat besar menyebabkan terjadinya
penumpukan sedimen di hilir sungai.Maka perlu dibangun
bangunan pengendali sedimen atau Dispersion Dam.
Berdasarkan perhitungan yang telah dilakukan baik
analisa hidrologi dan analisa hidrolika maka didapatkan debit
sungai sebesar 263188 mdet dengan lebar pelimpah Dispersion
Dam 74 m tinggi total Main Dam 128 m kedalaman pondasi
Main Dam 28 m panjang Apron 1673 m tebal Apron 19 m
tebal mercu Main Dam dan Sub Dam 15 m tinggi total Sub Dam
37 m. Dari hasil analisa perhitungan kesetabilan bangunan
Dispersion Dam aman dari guling geser retak dan turun.
Dengan di bangunnya Dispersion Dam di Sungai Rejali dapat
menampung sedimen sebesar 6.511.717 m sehingga bangunan
di hilir Dispersion Dam di harapkan lebih aman.
ABSTRACT
Planing Rejali Dispertion Dam in the river Rejali area
that has 3945 km is located in the village Jugosari
Candipuro Lumajang district of East Java with a length of 1868
km main river the location of watersheds on the slopes of mount
semeru current alert status which means it has the potential
dangers of cold lava is greater than when the normal status.
Possibility of cold lava flood on the river is very large leading to
a buildup of sediment in the river downstream. It is necessary to
build a building or Dispertion Dam sediment control.
Based on the calculation have been carried out both the
analysis of hydrology and hydraulics analysis of river discharge
is obtained for 263188 msec with a width of 74 m over flow
Dispertion Dam height 128 m total Main dam Main dam
foundation depth of 28 m apron length is 1673 m thick apron is
19 m thick top main dam and sub dam is 15 m total height of
sub dam 37 m. Based output calculation stability Dispersion
Dam building secure form roll friction fissure go down.
By the construction of Dispertion Dam on Rejali river it
can accommodate sediment up to 6.511.717 m that can
minimalized damage on another construction in downstream
Rejali river.
Keywords:
Dispersion Dam; banjir
Subject
: DAM
Contributor
Ir. PUDIASTUTI
Date Create
: 08/12/2015
Type
: Text
Format
: PDF
Language
: Indonesian
Identifier
: ITS-NonDegree-31102150001281
Collection ID
: 31102150001281
Call Number
: RSS 627.883 Tha p
Source Non Degree of Civil Engineering, RSS 627.883 Tha p, 2015
Coverage ITS Community
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