Sudirman, I. and Alamsyah 2020. Land Gradation Effect Analysis on Permeability and Ponding Time on Repeat Rain Frequency: Laboratory Study with Rainfall Simulator . Journal La Multiapp. 1, 1 (Jan. 2020), 10-17. DOI:https://doi.org/10.37899/journallamultiapp.v1i1.35.