Study Of Seawater Flooding (Rob) In The Northern Area Of Medan

Abstract

Tidal flooding is a natural event or phenomenon where seawater enters the land area when the sea level experiences
high tide conditions, either directly or through overflowing river water. The tidal flood that occurred in the northern
part of Medan was the same as what happened on every coast. The land area affected by tidal flooding is getting wider
and wider, so there needs to be an analysis of the potential tidal flood vulnerability so that handling and prevention
efforts can be right on target. The potential for tidal flood vulnerability uses 9 criteria, for that the AHP and GIS
integration methods are used in order to make rational decisions from several criteria that produce a vulnerability map.
The results obtained in the northern area of Medan city that 1,546.89 ha (16.39%) have a high to very high level of
vulnerability, while 4,411.92 ha (46.83%) have a moderate level of vulnerability to tidal flooding. The results of the
vulnerability level show that 13 environments are in the very high category of 6.16%, 44 environments are in the high
category of 20.85% and 64 environments are in the medium category of 30.33%. In the mitigation strategy, the efforts
that must be made by the Government are 1. building pump houses, 2. structuring buildings, especially in the
environment adjacent to the coast, 3. providing maps of tidal flood-prone zones and vulnerability, 4. relocating the
area by building flats