Infiltration well to reduce the impact of land use changes on flood peaks: a case study of Way Kuala Garuntang catchment, Bandar Lampung, Indonesia

Abstract

Abstract. Significant land use changes due to rapid development, a central issue in Bandar Lampung and high rainfall intensity are the main triggers for frequent flooding. This study was carried out to define design rainfall intensity based on analysis of hourly temporal rainfall pattern for calculating design discharge, predict the impact of land use changes on flood peaks, and predict the impact of infiltration well on flood peak reduction. The results showed that rainfall distribution pattern for storm duration of 4 h are 40, 35, 20 and 5% for the first, second, third and fourth hour, respectively. Analysis on land use changes underlined that if 30% of the catchment area is maintained for green land then flood peaks can be decreased. However, with city development, land conversions are intended for settlements, industries and trading areas which will increase flood peaks significantly. Application of infiltration well in the catchment can reduce surface runoff depends on the density and dimension of the well. The results suggest that using infiltration well with diameters between 0.8 to 1.4 m which are applied each in every 4000 m2 of land area will reduce flood peaks from 6.9 to 12.6%. While the application of infiltration well with density of 500 m2 will reduce flood peaks from 55.21 to 99.8%. Commitment and relevant government policies and community participation will encourage to undertake flood reduction measures.

Scenarios for urban drainage on a Legal Amazon planned city: a case study in Palmas, Brazil

“…Reinforcing this result, Caputo (2012) found reductions ranging from 12 to 29%. These results are similar to those presented by Kusumastuti et al (2014), as they have found reductions nearly above 25% when using infiltration wells with 5-year-return period storms.…”

“…Some of them are the residential reservoirs, green roofs, permeable pavement, infiltration trenches, and infiltration wells. The use of the latter two were particularly studied by Silva (2007), Caputo (2012), and Kusumastuti et al (2014) in situations comparable with the ones simulated for Palmas.…”

Urban sediment in infiltration wells: A lesson from the northern area of greater Yogyakarta city

“…Some are mainly concerned with the effects of stormwater (Li et al, 2012;Locatelli et al, 2017). Furthermore, the studies technically make a calculation model related to the capacity of infiltration wells (Jang et al, 2018;Kusumastuti et al, 2014;Li et al, 2011). There is a need for a new evaluation of infiltration wells and preliminary findings regarding a new perspective on groundwater conservation in densely populated areas through direct measurements in the field.…”

Evaluation of Urban Flood Control Project –Case Study at Bendung Watershed in Palembang City, Indonesia–

“…Its population is about 1.5 million. The rapid economic growth is encouraging an urbanization and land use changes 1) , those sometimes increase damages by river floods.…”