Abstract
Land cover change is a strategic issue in the Subwatershed of Danau Limau Manis. The community was triggered by the big earthquake of September 30, 2009, so people moved to the upper watershed. The problem is the increasing number of people, the damage to the watershed ecosystem. This damage can be seen from the erosion of river water and the availability of river water during the rainy season and dry season. An appropriate solution is needed to reduce erosion by modeling land cover. This study aims to determine the value of soil erosion and peak discharge. Erosion using a rational formula using the modified universal soil loss equation model based on land units and peak discharge. The land unit is an overlay of land cover maps, slope maps, and soil maps. Land units that produce erosion and exceed the tolerance limit are carried out with a land cover change scenario using the spatial multi-criteria analysis model. Scenario determination is also based on slope maps, land cover maps, soil maps, river flow density maps, forest area maps, erosion values , and the Padang city spatial plan. The study results explain that the erosion and peak discharge resulting from the existing land cover is quite large, namely 47.89 tons/hectares/year and 152.81 m3/sec. After scenario modeling, erosion decreased by 11.91 tons/hectares/year and peak discharge 15.26 m3/sec.
Highlights
Watershed is seen as an area with a high integration between human interests in meeting the needs of life and the interests of ecosystem protection
RM is the erosivity of rain obtained from surface runoff and peak discharge
The subwatershed of Danau Limau Manis (DLM) consists of 12 land units with an area of 3,158.90 hectares
Summary
Watershed is seen as an area with a high integration between human interests in meeting the needs of life and the interests of ecosystem protection. This condition often causes problems for the environment. The destruction of a watershed ecosystem is undoubtedly a big problem that will cause natural disasters, such as floods, landslides, and erosion. The destruction of the watershed area is in line with the increasing number of people who need land for the built area. The destruction is due to the change in the vegetated land cover into built-up areas, resulting in erosion, sedimentation, and even on a large scale, causing floods, landslides, and flash floods. Changes in land use into built-up areas will impact changes in flow characteristics, flooding in the rainy season, decreasing river discharge, and drought in the dry season [1]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
