ANALISA PENGENDALIAN BANJIR AKIBAT PELUAPAN DEBIT ALIRAN DENGAN PERKUATAN TEBING MODEL SHEET PILE Studi Kasus Sungai Batang Lumpo Kabupaten Pesisir Selatan

Sari

Flooding ia caused by the increased volume of water’s volume in the river or lake so that water is
out of its natural limits. The flooding is mostly caused by inadequate river capacity to accommodate river
discharge. The amount of river discharge at the time of flood is caused by the increasing amount of surface
runoff from the rains that fall in the catchment area. Based on the preliminary survey conducted, it was found
that the frequency of flooding in the Batang Lumpo river area is 2-3 times a year with a height ranging from
0.5 to 1.5 meters from the soil surface with the duration of inundation ranges from 4 to 6 hours. Areas
affected by flooding ranging from the area of Nagari Taratak Tengah Lumpo Kecamatan IV Jurai down to
the downstream river at Nagari Pasar Baru Kecamatan Bayang. By the result of the analysis obtained flood
discharge using Rational method Q 100 years = 237, 26 m³ / dt, high h = 2.7 m, the high value of W = 1.16
m length Sheet Pile in flood condition = 4.14 m, Maximum Moment Mmax = 6, 31 tm and sheet pile length in
dry condition = 3.16 m, Mmax Moment = 7,125 t.m.
Keywords: Flood, Outflow discharge, Sheet Pile