E3S Web Conf.
Volume 331, 2021International Conference on Disaster Mitigation and Management (ICDMM 2021)
|Number of page(s)||7|
|Section||Water and Resources Engineering|
|Published online||13 December 2021|
The effect of land uses to change on infiltration capacity and surface runoff at latung sub watershed, Padang City Indonesia
1 Doctoral Program in Agricultural Science, Andalas University, Indonesia
2 Department of Soil Science, Andalas University, Indonesia
3 Department of Economics, Andalas University, Indonesia
4 Department of Forestry, Muhammadiyah University of Sumatera Barat, Indonesia
* Corresponding Author: email@example.com
Changes in land use in the Air Dingin watershed (DAS) area in Padang City, Indonesia, lead to a decrease in rainwater infiltration volume to the ground. Some land use in the Latung sub-watershed decrease in infiltration capacity with an increase in surface runoff. This research aims to determine the effect of land-use changes on infiltration capacity and surface runoff. Purposive sampling method was used in this research. The infiltration capacity was measured directly in the field using a double-ring infiltrometer, and the data was processed using the Horton model. The obtained capacity was quantitatively classified using infiltration zoning. Meanwhile, the Hydrologic Engineering Center - Hydrology Modeling System with the Synthetic Unit Hydrograph- Soil Conservation Service -Curve Number method was used to analyze the runoff discharge. The results showed that from the 13 measurement points carried out, the infiltration capacity ranges from 0.082 - 0.70 cm/minute or an average of 0.398 cm/minute, while the rainwater volume is approximately 150,000 m3/hour/km2. Therefore, the soil infiltration capacity in the Latung sub-watershed is in zone VI-B or very low. This condition had an impact on changes in runoff discharge in this area, from 87.84 m3/second in 2010 to 112.8 m3/second in 2020 or a nail of 22.13%. Based on the results, it is concluded that changes in the land led to low soil infiltration capacity, thereby leading to an increase in surface runoff.
Key words: Land use / infiltration / runoff / Watershed
© The Authors, published by EDP Sciences, 2021
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