Study of flood discharge due to land use and population change of way pisang watershed

Abstract

In some areas in Indonesia, especially those around rivers that develop into urban areas are always faced with the problem of flooding in each rainy season. Soil surface characteristics can affect surface runoff in some areas. In general, human activities will increase along with the rate of population growth which results in increased land conversion activities to meet the economic needs of an area. This study will examine the level of population growth around the Way Pisang watershed in South Lampung Regency in 2007 and 2019, which is expected to influence land use change as a result of activities to meet economic needs, which in turn will have an impact on changes in the drainage coefficient resulting in an increase flood discharge in the watershed. The results of this study can be concluded that from 2007 to 2019, population growth in the Way Pisang Watershed increased by an average of 9.62%. With population growth accompanied by changes in land use where forest area has decreased 81.39%, paddy fields 52.90% and shrubs 85.54%. While the area of settlements increased by 56.10% and dry agricultural land/gardens increased to 147.62%. This resulted in an increase in drainage coefficient of 102.18% which in turn resulted in an increase in flood discharge on average by 28.82%.