The effect of land uses to change on infiltration capacity and surface runoff at latung sub watershed, Padang City Indonesia

Changes in land use the Air Dingin watershed (DAS) area Padang City, Indonesia, lead to a decrease rainwater infiltration volume ground. Some Latung sub-watershed capacity with an increase surface runoff. This research aims determine effect of land-use changes on and Purposive sampling method was used this research. The measured directly field using double-ring infiltrometer, data processed Horton model. obtained quantitatively classified zoning. Meanwhile, Hydrologic Engineering Center - Hydrology Modeling System Synthetic Unit Hydrograph- Soil Conservation Service -Curve Number analyze runoff discharge. results showed that from 13 measurement points carried out, ranges 0.082 0.70 cm/minute or average 0.398 cm/minute, while is approximately 150,000 m3/hour/km2. Therefore, soil zone VI-B very low. condition had impact discharge area, 87.84 m3/second 2010 112.8 2020 nail 22.13%. Based results, it concluded led low capacity, thereby leading