The application of LIDs in Savanna region for mitigation of flooded areas

Abstract

The increase in runoff volume due to urban sprawl has imposed a challenge to current urban drainage systems and future projects in order to add sustainable strategies for effective flood control especially in consolidated urban areas that would require retrofitting of urban areas with additional social and economic costs. This study is aimed at evaluating alternatives of drainage solutions in a consolidated urban area in the Federal District of Brazil, located in Savanna region, based on the reduction of peak flow and flooded volume in the areas exposed to flood hazard. Different solutions based on the concepts of Low Impact Development (LID) were simulated, showing that the current traditional drainage system is not in compliance with local regulations in the Federal District. In addition, the use of permeable pavements and stormwater ponds could reduce at least 46% of the flooded volume. When placed along with the drainage network, not only at the outlet, stormwater ponds were able to reduce the flooded volume and its hazard and damages. However, LIDs solutions were not able to completely eliminate floods in the region. Structural changes, as resizing the conduits into the drainage systems in the area, could improve the drainage system effectiveness avoiding floods and respective hazards and damages.

Use of hydrologic and hydraulic modeling for optimizing an existing detention pond

“…Note that the existence of a detention pond at the downstream end of a drainage system will not improve these problems, because its purpose is to reduce the flow peak released downstream to comply with local legislations. Similar results are found in the literature (Souza et al, 2019;Fileni et al, 2019;Araújo et al, 2019).…”

“…The 2D analysis from the PCSWMM show where the flooding occurs and the path of water, emphasizing as well the locations with higher water accumulation -these being more exposed to risk. This can be used to plot the most vulnerable areas and hence the best places for LIDs implementation (Fileni et al, 2019;Araújo et al, 2019). The 2D analysis from the PCSWMM show where the flooding occurs and the path of water, emphasizing as well the locations with higher water accumulation -these being more exposed to risk.…”

“…The 2D analysis from the PCSWMM show where the flooding occurs and the path of water, emphasizing as well the locations with higher water accumulation -these being more exposed to risk. This can be used to plot the most vulnerable areas and hence the best places for LIDs implementation (Fileni et al, 2019;Araújo et al, 2019).…”

“…PCSWMM Pro can integrate 1D-2D models (Fileni et al, 2019). It couples the 1D drainage system already described prior with a 2D mesh created using a DTM.…”

Modelagem hidrológica e hidráulica usando o SWMM - Storm Water Management Model na bacia urbana do Riacho Fundo I - Distrito Federal

“…Foi utilizado o programa PCSWMM da CHIWater na versão 7.2 que corresponde ao modelo SWMM acoplado a um Sistema de Informação Geográfica -SIG, disponibilizado gratuitamente a instituições acadêmicas, bastante utilizado no DF para estudos de drenagem urbana (Costa, 2013;Souza, 2014;Tsuji et al, 2019;De Paula, 2019;Fileni et al, 2019;Brito et al, 2020 Research, Society and Development, v. 10, n. 1, e6010111458, 2021 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v10i1.11458 6 atribuído a problemas com os dados de precipitação e na curva-chave, que foram aperfeiçoados e, portanto, refeita a modelagem. Foram empregadas melhorias nos dados de entrada, como a nova série de precipitação, 2018-2019, composta por três pluviógrafos, bem como a vazão gerada na nova curva-chave do período, por meio da inclusão de mais pontos de medição de nível e vazão.…”