GEOGRAPHIC INFORMATION SYSTEM(GIS)MAPPING OF SOIL INFILTRATION (USING DOUBLE RING INFILTROMETER) IN BARANGAY SAN JOSE, GENERAL SANTOS CITY

This study aims to generate a map of the water infiltration rate in Barangay San Jose, General Santos City using a double-ring infiltrometer and QGIS software. The data obtained from the field study shows distinct infiltration rates in different stages of infiltration in thirteen (13) parcels. The main objective is to generate a map of the instantaneous and cumulative infiltration of Barangay San Jose using QGIS 3.16.4 Hannover software. Data gathering took from December 23 to December 26, 2019. The data gathered in this study were the latitude, longitude, elevation, up-site weather, on-site temperature, moisture content, relative humidity, water depth, instantaneous infiltration rate, and cumulative infiltration. Using a double-ring infiltrometer, the infiltration rate was determined for five(5) stages of instantaneous infiltration rate and cumulative infiltration. The data obtained from the field study show distinct infiltration rates in different stages of infiltration in thirteen (13) parcels. Based on the data gathered, the highest average instantaneous and lowest instantaneous infiltration were located at Parcel 18 with 383 mm/hr. and Parcel 4 with 31 mm/hr., respectively. Meanwhile, the highest cumulative infiltration is located at Parcels 5 and 7 with 1, 961 mm of water infiltrated, and the lowest cumulative infiltration is located at Parcel 4 with 56 mm of water infiltrated. The soil texture of most parcels is mostly clay. The accumulation of water slowed down as time elapsed since the cumulative was the total water that has infiltrated through a unit of the horizontal area of soil surface over a given period, measured from the beginning of infiltration. The data gathered were mapped into five (5) different stages and the highest and lowest instantaneous infiltration rate and cumulative in Barangay San Jose were determined.