This study aimed to determine the use of GIS (Geographic information
Systems) in identifying the distribution of tidal overflow in the tidal area in Losari
Lor Village, Losari District, Brebes Regency. The study used a mixed-method. The
population in this study was the type of land use. The sampling technique used in
this study was a total sampling area with 301.56 hectares of land-use area. The
data were collected using observation, satellite image interpretation, and data
documentation. The data in this study consisted of primary and secondary data
which were analyzed using descriptive quantitative and qualitative methods. The
results of this study on the use of GIS were presented using hydrotopographic
spatial modeling. This modeling was chosen as an approach to compare the
elevation of the altitude with the highest HHWL value in one year and the
measurement results of the height value of the channel oveiflow from the ground
swface. Hydrotopographic modeling would produce a tidal oveiflow zone map.
The result of this study showed that the distribution of tidal ovetjlow in the case
study area was identified to be spread over six types of land use covering an area
of 124.18 hectares which was determined from the spatial data overlay of the tide
oveiflow zone map with land use maps. In addition, the phenomenon of tides in the
study area experienced the highest tidal oveiflow in a year from February to April
or coincided with mangsa rendeng (rainy season) towards mangsa mareng
(transition season).