Wilis, R. and Nugroho, S. 2017. The Decrasing Trend of Precipitation Observed at Watersheds in Padang for The Period 1975-2013. Sumatra Journal of Disaster, Geography and Geography Education. 1, 2 (Dec. 2017), 222–233. DOI:https://doi.org/10.24036/sjdgge.v1i2.82.