Urban Green Space Arrangement for an Optimal Landscape Planning Strategy for Runoff Reduction

Increased impervious surfaces due to urbanization have reduced evaporation and infiltration into the soil compared with existing natural water cycle systems, which causes various problems, such as urban floods, landslides, and deterioration of water quality. To effectively solve the urban water cycle issue, green infrastructure using urban green space has emerged to reduce runoff and increase evaporation. It has the advantage of restoring the water cycle system of urban areas by complementing the failure of conventional stormwater treatment systems. However, urban areas under high-density development have limited green space for stormwater treatment. Hence, it is necessary to efficiently utilize street trees and small green spaces to improve the urban water cycle through green space. In this study, we simulated different green space distribution scenarios in the virtual domain to find the optimal strategy of green space planning. Compared to clustered scenarios, dispersed green space distribution scenarios and placing green space downstream were more effective in reducing the runoff amount. The paper provides insights into the considerations for determining green space spatial plan and zoning regulations for stormwater treatment by green infrastructure.

The Urban Water Cycle as a Planning Tool to Monitor SARS-CoV-2: A Review of the Literature

COVID-19 is a terrible virus that has impacted human health and the economy on a global scale. The detection and control of the pandemic have become necessities that require appropriate monitoring strategies. One of these strategies involves measuring and quantifying the virus in water at different stages of the Urban Water Cycle (UWC). This article presents a comprehensive literature review of the analyses and quantifications of SARS-CoV-2 in multiple UWC components from 2020 to June 2021. More than 140 studies worldwide with a focus on industrialized nations were identified, mainly in the USA, Australia, and Asia and the European Union. Wastewater treatment plants were the focus of most of these studies, followed by city sewerage systems and hospital effluents. The fewest studies examined the presence of this virus in bodies of water. Most of the studies were conducted for epidemiological purposes. However, a few focused on viral load and its removal using various treatment strategies or modelling and developing strategies to control the disease. Others compared methodologies for determining if SARS-CoV-2 was present or included risk assessments. This is the first study to emphasize the importance of the various individual components of the UWC and their potential impacts on viral transmission from the source to the public.

Effects of the COVID-19 Pandemic on the Urban Water Cycle

The coronavirus disease 2019 (COVID-19) is a global crisis spreading to all countries. This study explains and documents the first-order effects of the new coronavirus on the urban water cycle. Urban water systems play an important role in public health because people rely so heavily on water services. Findings address short- and long-term changes in climate variables; availability and accessibility of clean water to prevent and control the spread of coronavirus in water-scarce cities; shifts in habits, behavior, and lifestyles of people and effects on water demand during lockdowns; and role of wastewater treatment in preventing the spread of coronavirus.

Wastewater Tariffs in Spain

Urban water cycle services culminate in wastewater services; that is, with the collection, transport, and treatment of wastewater. Wastewater management in Spain is not a straightforward issue. In fact, the European Commission has initiated infringement procedures against Spain for not fully complying with the Urban Waste Water Treatment Directive. Yet, appropriate collection and treatment would require a large monetary investment that is increasingly difficult to carve out of existing government revenues. In this context, wastewater pricing emerges as a significant tool for achieving cost recovery and environmental protection aims. In Spain, local governments are responsible for providing wastewater services in urban areas and for setting the prices for those services. Spanish regional governments are in charge of specific pollution taxes on wastewater, which are included in the individual users’ water bills. Moreover, in most Spanish cities, the urban water tariffs for wastewater services (like water supply tariffs) are different for different users, representing the most common distinction between residential and nonresidential users. Additionally, specific tariffs are frequently imposed for different customer groups within both categories. In this respect, it is common to include pollution charges for industrial users, increasing their water prices according to the environmental impact of their wastewater discharges. The result is a very complex map of water-pricing and taxing in Spain.