Environmental Consideration In Flood Mitigation And River Restoration

Abstract

One of the fundamental section of sustainable improvement in river basin systems and has multifunctional targets is river restoration. The targets of river restoration are to minimize the physical degradation and recover river elegance value, pollution manage and good ecosystem with biodiversity. River restoration is a multidisciplinary task in which engineer, hydrologist, geologist and ecologist can work together to enhance river environment. In decades ago, Malaysia was exposed to fast evolution and subsequently extreme flooding has happened especially in urban territories. In order to minimize flood damage, the flood mitigation measures were taken and channel improvement is mainly utilized for this goal. Due to the insufficient available river reserve and perhaps the absence of environmental awareness, previously, the consultant engineers usually advised a wider and deeper rectangular concrete river channel to mitigate the flood damage. The replacement of the natural river channel with a concrete channel outcomes are increased physical degradation and lowering of aesthetic and recreational values of rivers. Lately, there is a strong confirmation to take into account the environmental effect in rivers canalizing. Malaysian experience in restoration of the urban river will be focused on in this study, with a particular emphasis on environmentally friendly materials utilized for flood mitigation goals.

Appraisal of Cost-Effective Approaches for the Pusu River Rehabilitation

“…Similarly, restoration entails restoring a deteriorated river to its original state (Minakshi & Goswami, 2014). It also can be defined as actions taken to the rivers and their basins that have experienced critical pollution damage to their natural habitats to return the rivers to their original states before the damage (Saad et al, 2019). However, some researchers have asserted that river restoration may be impossible to achieve; thus, the work to treat the condition is commonly referred to as rehabilitation (Rutherfurd et al, 2000).…”

“…Fig 2 illustrates the differences between the terms restoration, rehabilitation and remediation. Saad et al (2019) suggested that two approaches are primarily used to treat the river. The first approach is self-purification, in which the rivers will purify themselves through actions like flowing, dilution, deposition and absorption and recreating their natural course and flooding scheme (Saad et al, 2019).…”

“…Saad et al (2019) suggested that two approaches are primarily used to treat the river. The first approach is self-purification, in which the rivers will purify themselves through actions like flowing, dilution, deposition and absorption and recreating their natural course and flooding scheme (Saad et al, 2019). However, despite the river's ability to purify itself, it has a limit.…”

“…However, despite the river's ability to purify itself, it has a limit. Some rivers can be damaged to the point where the water quality degrades and the time required to self-heal is longer than usual, and as a result, the second approach, known as an active treatment, is used to treat polluted rivers (Saad et al, 2019).…”

Várzeas construídas como Soluções Baseadas na Natureza (SbN) para readequação de rios e córregos urbanos

“…Assim, o Quadro 1 destaca os aspectos que são atendidos totalmente (verde), parcialmente (amarelo), ou não são considerados (cinza) pelos termos citados. Sua construção foi possível a partir de buscas de cada terminologia na base de dados Scopus, sendo o termo "Restauração" o mais recorrente nos artigos mais recentes (MIGUEZ et al, 2015;PRIOR, 2016;BAPTISTA et al, 2017;MROZIŃSKA et al, 2018;BECKER;CHAPMAN;GO-MES;SAMMEN;SKRINAR et al, 2019;CHEN & CHO, 2019;PALMER & RUHI, 2019;BLAZY, 2019;ALENCAR & PORTO, 2019;WI-KANTIYOSO et al, 2020;). Percebe-se, a partir da análise dos artigos e do quadro resumo, que a proposta do termo Readequação tem o foco voltado para a funcionalidade, em termos antrópicos, dos rios e córregos urbanos, no sentido da promoção de serviços ecossistêmicos, aliado por sua vez a manutenção de uma qualidade ambiental satisfatória desses ecossistemas.…”