Abstract
Semarang City is one of the cities located in the north coast of Java, has characteristics of hilly areas and lowland areas, Semarang City is one of the coastal areas and has a high Rob potential. Subdistricts in Semarang City that are inundated by rob disasters are North Semarang Subdistrict, Ngalian, Tugu, Genuk and Pedurungan. The purpose of this research is 1) mapping of inundation in Semarang City using Geographic Information System (GIS). 2). Knowing the quality of ground water (wells) for public consumption around the coastal area of Semarang City that has been exposed to rob water. 3) Find out how many rob water levels have contaminated the Well. Widespread Distribution Population of Rob in Semarang City. Side technique in this research is Purposive Random sampling. The result of this research is the quality of well water obtained from direct measurement of field. Measurements are made using the Water Quality Checker tool. The measurement parameters include pH, DHL, TDS and Nitrate. The required data is the coastal administration map of Semarang city, and the well water quality parameters of KEPMENKES. Selection and sampling of well water by using stratified random sampling technique. The analysis includes a well water quality test in the rob area. Data collection techniques used questionnaire, observation, and documentation techniques. The measurement parameters include pH, DHL, TDS, and Nitrate. It can be seen that the worst affected District is Genuk District and the District which is still good quality is Pedurungan District.
Highlights
Semarang city is one of the areas located in the north coast of Java
With varying topographic topography, ranging from 0.7 -348 m above sea level, it consist hills with a land slope ranging from 0%-45%, coastal areas have a slope of 25%, and hill areas reaching a slope of 15-40%
Based on the results of research on the Quality of Groundwater on Rob Disaster, Tugu District has pH value of 7.037 which is still in the standard allowed by KEPMENKES 2010 of 6,5 - 9,5
Summary
Semarang city is one of the areas located in the north coast of Java. Some coastal cities, such as Semarang has abundant potential as well as the threat of danger that is not small as experienced by other big cities. Rob is the process of rising or descending of sea level position periodically due to the influence of gravity and the attraction of astronomical objects, especially by the moon, sun, and earth (Poerbandono in Syetiawan, 2014: 96) [2]. The tide itself occurs when waves formed in the middle of the sea due to the gravity of the moon and the sun, are infected when it reaches the coastal area. The water of this couple enters the coastal areas that have a lower elevation or equal to the mean sea level (MSL) and the estuary of the river, resulting in inundation by tides of seawater or often referred to as a rob flood. The height of the robot flood will increase along with the rising sea levels and hurricanes that occur in the area
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