STUDY OF FLOOD CONTROL AND MORPHOLOGY OF THE JEROAN RIVER IN MADIUN REGENCY
Jeroan River is a tributary of the Madiun River located in the Madiun District. The problem that occurred in Jeroan River is flood happen several times . Floods are caused by high rainfall, the influence of bankfull capacity, changes in land use and the presence of backwater from Madiun River. Th...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/71279 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Jeroan River is a tributary of the Madiun River located in the Madiun District.
The problem that occurred in Jeroan River is flood happen several times . Floods
are caused by high rainfall, the influence of bankfull capacity, changes in land use
and the presence of backwater from Madiun River. This research was conducted
to analyze the causes of flooding, flood control and river morphology in order to
evaluate and complement the flood control study conducted in 2018.
Hydrological and hydraulic analysis was carried out using the HEC-HMS 4.10
and HEC-RAS 6.1 programs. The area of the Jeroan Basin is ± 620 km2 with the
length of the main river of ± 36 km. The Jeroan watershed modeling is divided
into 5 subbasin, namely Upper Jeroan Subbasin, Mejayan Subbasin, Klitik
Subbasin, Piring-Sono Subbasin and Muneng Subbasin. In this study, calibration
was carried out 4 times including hydrological calibration, manning calibration,
model results calibration and canal bottom change calibration.
Based on the results of the study, flooding was caused by an increase in R25 of
17% at the Gemarang station, 13% at the Saradan station and 12% at the
Muneng station. Backwater only occurs when Madiun River on the highest water
level elevation and does not occur when the water level elevation in on average
daily The effect of the backwater of the Madiun River increases the water level of
the Jeroan River by 0.85-1.65 meters (at the most critical cross) with a length of
influence of up to ±15 km from downstream. Changes in land use increase the
planned flood discharge by 4%. Q25 was obtained for each subbasin of 322.2
m3/s in Upstream Jeroan Subbasin, 344.9 m3/s in the Mejayan Subbasin, 96.1 m3/s
in the Klitik Subbasin, 223.8 m3/s in the Piring-Sono Subbasin, and 149.4 m3/s in
the Muneng Subbasin. In this study, an evaluation was carried out on planning the
results of the 2018 study using the planned flood discharge from the 2022
calculation results, it was found that the results of the 2018 planning could handle
49% of flood from initially being able to handle 100%. Jeroan River tends to
experience bed degradation with a degradation of 149,646 tonnes/year and an
aggradation of 121,145 tonnes/year. The biggest degradation occurred at sta J-
610 of 1.2 m/year. The addition of 2 groundsills upstream and downstream of the
bridge on J-177 can overcome the degradation of Jeroan River. |
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