STUDY OF FLOOD CONTROL AND MORPHOLOGY OF THE SARIO RIVER IN MANADO CITY
Sario River is located in Manado City, North Sulawesi Province, Sario River is one of the rivers that contribute to flooding in Manado City. Floods that occurred in Manado City in 2014, 2017, 2019 and 2021 resulted in a lot of loss and damage to community facilities and infrastructure, as well as...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/62658 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Sario River is located in Manado City, North Sulawesi Province, Sario River is one
of the rivers that contribute to flooding in Manado City. Floods that occurred in
Manado City in 2014, 2017, 2019 and 2021 resulted in a lot of loss and damage to
community facilities and infrastructure, as well as paralyzing residents' activities.
Floods that occur are caused by high rainfall, conversion of land in the upstream
part, silting occurs due to sedimentation and garbage, as well as river narrowing
due to the occupation of people around the riverbanks. Because the condition of the
Sario River downstream is very densely populated due to residents' occupations, in
this study the solution offered for flood control, especially in the downstream Sario
River, is by building a by-pass channel under the road that is directly directed to the
sea, considering the liberation land for the construction of the embankment still
cannot be implemented and requires a long process. The construction of this bypass
channel aims to minimize flood discharge in the downstream area of the Sario
River. The by-pass channel under this road will drain some of the water discharge
in the Sario River during the Q25 flood discharge, which is 223.18 m³/sec. The
methodology used in this study is hydrological analysis and hydraulic analysis and
sedimentation analysis. Hydrological analysis was carried out to calculate the
design flood discharge, and hydraulic analysis using the HEC-RAS 6.1 1D software
using cross-sectional data from the Sario River. This study will simulate the water
level and discharge after the construction of the by-pass channel under the road, as
well as the agradation and degradation that occurs in the Sario River. Based on
hydraulic analysis, the construction of a by-pass channel can reduce flood discharge
in the downstream of the river, which is around 65.35%. And from the results of
the study it was also found that for the research location there was sedimentation in
several sections so that handling was needed, namely by normalizing or dredging
the riverbed. Normalization is carried out every year to minimize sedimentation that
occurs in the Sario River. |
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