The Study of Area Infiltration Rate by Using Biopori Holes as an Effort to Reduce Water Level and Groundwater Conservation

摘要

The expansion of land development for settlement and other infrastructure has impact for lessen of green open space that serves to absorb rainwater.Accordingly to that,there is a need of effort to increase the absorbtion rate of rainwater into the ground;one of the methods is using biopori holes.The area that uses as a sample to observe the infiltration rate using biopori holes is Kopelma Darussalam,Banda Aceh.The aim of this study is to measure the infiltration rate before and after the application of biopori holes,find out the amount of holes that required,discover the differences of ground water level every 2,5,and 10 years return period and find out the amount of water that absorbed to ground water.The data which uses to calculate the water level is the annual maximum daily rainfall,land area under forest cover and texture,and infiltration rate.Meanwhile,the data which uses in order to calculate the volume of water infiltrated into the soil in each month is monthly rainfall data,land area which classified by the cover and texture and infiltration rate.Inundation height at annual maximum rainfalll plan for 2,5,and 10 years return period with using 100,160 and 400 holes for each 100 m~2 is lower from 9.01% to 77.43% compared to not using biopori holes.In addition,the amount of water that infiltrated after using biopori holes is increasing up to 4120 m~3 for each month.