Urban stormwater management under various runoff conditions for Arba Minch town of southern Ethiopia

Ayda, Bereket Ayele; Goshime, Demelash Wondimagegnehu; Finsa, Mekuanent Muluneh; Ayalew, Abebe Temesgen

doi:10.1016/j.nhres.2024.02.003

Cited by 2 publications

(1 citation statement)

References 51 publications

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“…Rapid urbanisation and global climate change pose significant challenges to urban stormwater management. Urbanisation and population growth increase urban runoff and impact the natural environment's storage capacity, with extensive impermeable pavements replacing permeable vegetated surfaces, greatly reducing rainwater infiltration, leading to an increase in urban runoff and placing greater pressure on traditional stormwater management systems [1,2]. To address the growing need for urban stormwater management resulting from urbanisation and climate change, sponge city projects are proposed and constructed.…”

Section: Introductionmentioning

confidence: 99%

Storage Scale Assessment of a Low-Impact Development System in a Sponge City

Xie,

He,

Dong

et al. 2024

Water

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A sponge city is an established urban stormwater management approach that effectively reduces urban runoff and pollutant discharges. In order to plan and design, estimate costs, and evaluate the performance of urban sponge city systems, it is essential to calculate the storage scale. In this context, a sponge city storage scale and calculation method based on a multifactor spatial overlay was designed, utilising the starting area of the Dafeng Hi-tech Development Zone in Yancheng City, China, as an illustrative example. The indicators for assessing the impact of sponge city systems on river plain networks are constructed based on four aspects: land planning, building density, water surface rate and green space rate. The relative importance of each indicator was determined based on the necessity of controlling runoff from land parcels and the appropriateness of facility construction. The annual runoff control rate of the 39 low-impact development control units in the study area was calculated using ArcGIS through multifactor spatial overlay mapping and weighting. The results showed that (1) the Geographic Information System (GIS)overlay technology can effectively assist in the decomposition of LID scales; (2) data can be derived, including the design storage volume and other basic control scale indicators for each unit. The study results are expected to serve as a reference for the preparation of special low-impact development plans in the river plain network area of China and the promotion of the construction of a sustainable blue–green system in the city.

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Section: Introductionmentioning

confidence: 99%

Storage Scale Assessment of a Low-Impact Development System in a Sponge City

Xie,

He,

Dong

et al. 2024

Water

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Effects of feeding water hyacinth (Eichhornia crassipes) fodder with or without commercial concentrate on zoo-technical performance and profitability in tropical goats and sheep

Fanta,

Kechero,

Yemane

2024

Preprint

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The utilization of unconventional feed resources, such as water hyacinth is an effective strategy to address feed shortages in tropical and subtropical regions, particularly where access to conventional feeds is limited. In this study, tropical sheep (Doyogena rams) and goats (Woyito-Guji bucks) fed diets containing different amounts of WH were examined for their zoo-technical performance and profitability sing a 2 x 4 x 4 randomized crossover design with two animal species, four nutritional treatments, and four feeding intervals. The dietary treatments consisted of 50% hay + 0% WH + 50% commercial concentrate (CC, T1), 50% hay + 12.5% WH + 37.5% CC (T2), 50% hay + 25% WH + 25% CC (T3), and 50% hay + 37.5% WH + 12.5% CC (T4). The findings showed that compared to goats, sheep had the highest energy and nutrient intake (P<0.001), nutrient digestibility (P<0.001), average daily gain (ADG, g/day), and body weight change (BWC (kg) (P<0.05). Regarding energy and nutritional intake, there was a substantial difference (P < 0.001) between treatment groups for both animal species, with the exception of goats' consumption of DM, OM, CHO, GE, and ADL (P <0.05). Likewise, significant differences existed between treatment groups for nutritional digestibility, ADG, BWC, and FCE for both species (P <0.001). Moreover, significant interactions (P < 0.005) were seen in all energy and nutrient intake parameters between species and treatment. Furthermore, in tropical sheep and goat breeds, water hyacinth can replace up to 37.5% of the commercial concentrate used for growth and fattening, but it has a major comparative effect on sheep. Feed prices for the T4 group fed sheep and goats were 37.2% and 36.8% lower, respectively, than for the T1 group. Therefore, farmers in the tropics who cannot afford commercial concentrates can still benefit economically by using the dry biomass of water hyacinth in their diet, either with or without it.

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Urban stormwater management under various runoff conditions for Arba Minch town of southern Ethiopia

Cited by 2 publications

References 51 publications

Storage Scale Assessment of a Low-Impact Development System in a Sponge City

Storage Scale Assessment of a Low-Impact Development System in a Sponge City

Effects of feeding water hyacinth (Eichhornia crassipes) fodder with or without commercial concentrate on zoo-technical performance and profitability in tropical goats and sheep

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