Abstract
Population and socio-economic growth trigger changes in land use functions. Land use and 
 climate change in line with the increase in the rate of surface water and a decrease in the quality of 
 water infiltration into the soil. Decreasing water absorption triggers an abundance of water on the 
 surface which leads to hydrometeorological disasters, one of them is flooding. The research study
 is in Pekalongan City which has a very flat topography a nd the estuary area of several rivers from 
 the upstream area. The current condition of Pekalongan City has a huge potential for flood 
 disaster. The purposes of this study are to measure the depth of the groundwater level, to delineate 
 the flooding area, and to recommend the infiltration wells based on the Geographic Information 
 System. The methods were hydrogeological mapping, including the measurement of the water 
 table, collecting land use maps, delineating flooding zone, calculating impermeable zones, 
 collecting hydrological data such as precipitation . The results show that the groundwater level at 
 the research location is classified into 3 classes, namely 0 -1.5 meters, 1.5-3 meters, and > 3 
 meters. The need for infiltration wells in the flood-prone areas of Pekalongan City is 57,718 units. 
 The needs for rainwater infiltration wells in areas outside flood -prone areas and groundwater 
 depth> 1.5 meters are 227,416 units with a well's depth between 1.5 to 4 meters.
 Keywords: Infiltration well, hydrometeorological, disaster Pekalongan City
Highlights
Kota Pekalongan memiliki luas wilayah 45,25 km2, yang terdiri dari 4 kecamatan (Gambar 1) dengan jumlah penduduk 304.477 jiwa (BPS, 2019)
The results show that the groundwater level at the research location is classified into 3 classes, namely 0-1.5 meters, 1.5-3 meters, and > 3 meters
Van. (1983) ‘Guide to Geomorphologic aerial photographic interpretation and mapping’, ITC Enschede The Nederland
Summary
Banjarnegara-Pekalongan (Condon, dkkl., 1996), daerah penelitian didominasi oleh endapan aluvium dengan litologi berupa kerikil, pasir, lempung, lanau, endapan sungai dan endapan rawa yang tersebar secara menyeluruh (Gambar 3). Berdasarkan Peta Hidrogeologi Lembar Pekalongan (Effendi, 1985), sistem akuifernya aliran air tanah melalui ruang antar butir dengan jenis produktivitas akuifer yaitu akuifer produktif dengan persebaran luas: Akuifer dengan aliran melalui ruang antar butir, akuifer ini tersusun oleh formasi aluvium yang terdiri atas material berukuran lempung, lanau, pasir, kerikil dan brangkal dengan nilai kelulusan 2,68 m/hari. Dan akuifer produktif sedang dengan persebaran luas: Akuifer dengan aliran melalui ruang antar butir, akuifer ini tersusun oleh formasi aluvium yang terdiri atas material berukuran lempung, lanau, pasir, kerikil dan brangkal dengan nilai kelulusan 1,3 m/hari (Gambar 4). Di Kota Pekalongan terdapat banyak penggunaan lahan sebagai lahan budidaya perikanan darat dan pertanian. Untuk keberadaan perikanan darat di Kota Pekalongan setiap tahunnya mengalami penambahan, khusus untuk tambak yang terdapat di Kecamatan Pekalongan Utara dan setiap tahunnya selalu mengalami penambahan luas. (Gambar 6)
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