Pengalihan Saluran Sungai pada Pembangunan Jalan Tol Kuala Tanjung- Indrapura di Desa Sungaj Pematang .Jering Mandarsah St A 3+975 - 4+400'

Abstract

The Mandarsah River is a river located in Pernatang Jering Mandarsah Village, Sei Suka District, Batu Bara Regency. The area of Batu Bara Regency is 922.20 krn2 of the total area of North Sumatra Province. The Mandarsah River was used as a diversion area for river channels during the construction of the Kuala Tanjw1g -lndrapura sta 3+975 - 4+400 toll road. The river channel diversion study was carried out because of piling work in the river diversion area for the construction of a pile slab bridge on the Kuala-Tanjung lndrapura toll road sta 3+975 - 4+400. The river diversion is pennanently diverted and is not returned to its original position because the flow of water is not much different from the river that was previously diverted, and the width of the river has been widened downstream. This research began in the even semester of the 2022/2023 academic year and was carried out in Pematang Jering Mandarsah Village dming the construction of the Kuala Tanjung - Indrapura Sta 3+975-4+400 toll road. The data collected in this research is primary data, namely observing the water discharge that occurs in the field, monitoring the implementation methods applied in the field. From the implementation ofriver channel diversion during the construction of the Kuala Tanjung - Indrapura Sta 3+975-4+400 toll road, it is known that the river diversion did not have an impact on bridge construction. From the calculation results, the cross­section of the Pematang Jering Mandarsah river meets the requirements for diversion with QS = l.9994m3/s, flow speed 0.05846 mis, and flow time = 3.4211 rn/sec. The flood discharge analysis used in this research uses the method Rational as planned flood discharge