With combinations of these alternatives, the inundation reduction effectiveness of catchment area (DTA) 1 is 93.5% and 99.6% for DTA2. For rainwater harvesting, the capacity of rain barrels varies from 350-1050 litres, and they are equipped with reservoir wells. Rehabilitation is performed by adjusting drainage depth, with consideration of the shallow groundwater in the area. The offered alternatives are rehabilitation of existing drainage channels, storage pond equipped with an automatic valve door, rainwater harvesting and gully plugs. Inundations occur due to outdated drainage systems, high levels of sedimentation, rapid urban development and topography that tends to be flat. Inundations occur and become problems in the City of Palu.
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March 2023
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