THE EFFECT OF LAND SUBSIDENCE ON THE SELECTION OF RAW WATER SOURCES IN HOTEL AND APARTMENT BUILDING IN SEMARANG CITY Benny Syahputra1) Berkah Fajar Tamtomo Kiono2) Sudarmo3)
1)Doctoral Student of Environmental Science Diponegoro University
1) Engineering Faculty, Sultan Agung Islamic University (UNISSULA)
2) Mechanical Engineering Study Program Diponegoro University
3) Environmental Engineering Study Program Diponegoro University
Abstract
The Semarang City Government prohibits the use of groundwater/ deep wells in hotel and apartment buildings, because the use of groundwater or deep wells in locations that have experienced subsidence will further aggravate the subsidence. The method used in this research is to purposively select hotel and apartment buildings in the city of Semarang that have received an assessment by the Semarang City Building Expert Team and have received a certificate of serviceability. Furthermore, make comparison between the map of land subsidence in some area of the city of Semarang with the raw water sources that have been used by the hotel and apartment buildings. The results of the research showed that from 10 hotel and apartment buildings there were 7 that used deep wells in zone level II, namely subsidence between 2.1 to 4 cm/year. Meanwhile, 3 other hotel and apartment buildings use water from the Municipal Drinking Water Company of Semarang. The existence of hotel and apartment buildings that use groundwater/deep wells in zone level II will increase and trigger the greater subsidence in the area, thereby increasing the level of subsidence to level III and so on
Keywords: Land subsidence, raw water, ground water, deep wells, less dense soil.
