LAJU INFILTRASI TANAH DI BEBERAPA TIPE TUTUPAN LAHAN DI KAWASAN CEKUNGAN AIR TANAH (CAT) WATUPUTIH KABUPATEN REMBANG, JAWA TENGAH
The North Kendeng Mountain is one of the karst areas that have the largest water reserves in Rembang District, known as CAT Watuputih. The karst area has the main constituent form of limestone and is a geological structure that plays an important role in controlling the hydrogeological system. The s...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/50639 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The North Kendeng Mountain is one of the karst areas that have the largest water reserves in Rembang District, known as CAT Watuputih. The karst area has the main constituent form of limestone and is a geological structure that plays an important role in controlling the hydrogeological system. The surface of the karst hill acts as the main reservoir of water because it has an epikarst zone composed of rock with high gap widening. CAT Watuputih is a supporter of underground water resources that flow out through springs around the groundwater basin area and an important support for agricultural life and household needs of the surrounding residents. Changes in land cover types and land uses, such as limestone mining, have the potential to change the hydrological process in the groundwater basin area. This study aims to determine the infiltration rate of various types of land cover such as: natural forest, teak forest, open land, built-up land, dry land agriculture (PLK) and mining and to see the relationship between water content and soil texture on the infiltration rate in the CAT Watuputih area. The sampling technique was carried out by using stratified purposive sampling of 20 plots. Measurement of the infiltration rate was done by using a double ring infiltrometer and repeated 4 (four) times at each location. Soil samples from each land cover were taken, then sent to Laboratorium Balai Pengkajian Teknologi Pertanian (BPTP) to measure the water content and soil texture. Variances of infiltration rate influenced by land cover type were analyzed using One Way ANOVA and the strength of the relationship between water content and soil texture to infiltration rate was analyzed using correlation tests with the help of Microsoft Excel 2016 software. The results showed that the infiltration rate was influenced by the type of land cover ( p-value 0.00343; alpha = 0.05). Natural forest has the highest infiltration rate (391.4 cm / hour), then teak forest (78.3 cm / hour), open land (69.5 cm / hour), built-up land (55.9 cm / hour), dry land agriculture (6.1 cm / hour), and mining (0 cm / hour). Soil water content has a high and positive level of correlation with the infiltration rate (r = 0.79), which means that the higher the water content, the infiltration rate will increase. Soil textures for 'Silt Loam' class were found in natural forest land cover and open land, 'Silt' class on teak forest land cover, 'Loam' class on built-up land cover and dry land agriculture and 'Sandy Loam' classes on mining land covers. Soil texture (clay fraction) has a very low correlation but has a negative relationship with the infiltration rate (r = -0.08) which means that the higher the clay fraction, the lower the infiltration rate. The results of this study are expected to be used to determine and improve the capacity of the rainwater catchment area in CAT Watuputih.
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