The Effect of Grass Block Paving on Runoff Coefficient

Abstract

The growth of urban areas is overgrowing, which has an impact on changes in land use. Green land that functions as rainwater catchment is covered with an impermeable surface, so runoff will increase and infiltration capacity will decrease. The method that can be done to reduce runoff is by using an impermeable cover with green plants. The pavement model used is an environmentally friendly pavement that can function to reduce surface runoff. The surface runoff coefficient is an indicator of land conditions. Surface land with the pavement will produce a large runoff coefficient while on natural land the runoff coefficient will be small. The grass block paving experimental model allows it to be used more widely because it has pores that can reduce runoff and increase the volume of water that enters the soil. The test results show differences in the runoff coefficient resulting in the tested land cover variations. The average runoff coefficient on land with a sandy loam texture without pavement is 0.41. Meanwhile, the average runoff coefficient for grass block paving is 0.43. On land with impermeable pavement, the runoff coefficient ranges from 0.50 to 0.70.