scholarly journals Guidelines for rainwater harvesting system design and assessment for the city of Johannesburg, South Africa

2018 ◽  
Vol 379 ◽  
pp. 409-414
Author(s):  
John Ndiritu ◽  
Adesola Ilemobade ◽  
Paulo Kagoda
Keyword(s):  
South Africa ◽  
Air Conditioning ◽  
Rainwater Harvesting ◽  
Daily Rainfall ◽  
Design Guidelines ◽  
Yield Ratio ◽  
Wet Season ◽  
Design Charts ◽  
Hydrologic Design ◽  
The City

Abstract. As water demand increases rainwater harvesting (RWH) systems are increasingly being installed for water supply but comprehensive hydrologic design guidelines for RWH do not exist in many parts of the world. The objective of this study was to develop guidelines for the hydrologic design and assessment of rainwater harvesting (RWH) systems in the City of Johannesburg, South Africa. The data for developing the guidelines were mainly obtained from multiple daily simulations of potential RWH systems in the city. The simulations used daily rainfall from 8 stations and demands based on the probable non-potable uses of RWH systems – toilet flushing, air conditioning and irrigation. The guidelines were confined to systems that would typically fill up in the wet season and empty towards the end of the dry season of the same year. Therefore, supply-to-demand ratios ranging from 0.1 to 0.9 were applied. Two generalized design charts of dimensionless relationships were developed. One relates the yield ratio with supply-to-demand ratio and reliability while the other relates the yield ratio with the storage-to-demand ratio and reliability. Reliability was defined as the probability of exceedance of annual yield in order to incorporate the large inter-annual variability of rainfall experienced in the region. The analyses and design of an example RWH system is used to illustrate the application of the design charts.

scholarly journals Evaluation of the Performance of Rainwater Harvesting Systems for Domestic Use in Tlalpan, Mexico City

2017 ◽  
Vol 3 (3) ◽  
pp. 137-151 ◽  
Author(s):  
Niall Patrick Nolan ◽  
Cecilia Lartigue
Keyword(s):  
Mexico City ◽  
Rainwater Harvesting ◽  
World Health Organisation ◽  
World Health ◽  
Wet Season ◽  
Integrated Water Management ◽  
Formidable Challenge ◽  
Harvesting Systems ◽  
Alternative Means ◽  
The City

Rainwater harvesting (RWH) as an alternative means of providing water in domestic contexts, is viewed as an effective supply option worldwide. In Mexico City, the water situation is critical and the provision of water services to the population represents a formidable challenge for the city’s water utilities. The main objective of this study is to evaluate the potential for RWH to supply domestic properties in Tlalpan, 1 of 16 delegations in the city with one of the highest percentages of homes unconnected to the distribution network. Results show RWH can meet 88% of household water demand during the 6 month wet season, with an annual saving of 55%. Modelling a World Health Organisation minimum demand of 20 l/p/d as a means of resilience management in the event of a water crisis, 6-month and annual savings were 99% and 80% respectively. The minimum tank size to achieve wet season savings of 90% was 6m3 in two precipitation bands and tank sizes of 13,000 – 17,000L were sufficient in 3 out of 4 to prevent overspill. The report concludes RWH is a viable method of providing water in the south of the city and should be part of an integrated water management solution.

Transnational Habitus and Sociability in the City: Zimbabwean Migrants’ Experiences in Johannesburg, South Africa

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Khangelani Moyo
Keyword(s):  
South Africa ◽  
Urban Space ◽  
Field Research ◽  
The South ◽  
Economic Networks ◽  
Social Field ◽  
Transnational Migrants ◽  
Telephone Calls ◽  
The City

Drawing on field research and a survey of 150 Zimbabwean migrants in Johannesburg, this paper explores the dimensions of migrants’ transnational experiences in the urban space. I discuss the use of communication platforms such as WhatsApp and Facebook as well as other means such as telephone calls in fostering the embedding of transnational migrants within both the Johannesburg and the Zimbabwean socio-economic environments. I engage this migrant-embedding using Bourdieusian concepts of “transnational habitus” and “transnational social field,” which are migration specific variations of Bourdieu’s original concepts of “habitus” and “social field.” In deploying these Bourdieusian conceptual tools, I observe that the dynamics of South–South migration as observed in the Zimbabwean migrants are different to those in the South–North migration streams and it is important to move away from using the same lens in interpreting different realities. For Johannesburg-based migrants to operate within the socio-economic networks produced in South Africa and in Zimbabwe, they need to actively acquire a transnational habitus. I argue that migrants’ cultivation of networks in Johannesburg is instrumental, purposive, and geared towards achieving specific and immediate goals, and latently leads to the development and sustenance of flexible forms of permanency in the transnational urban space.

San Francisco's Vision for the Future: An Integrated Urban Wastewater Management Plan

2009 ◽  
Vol 4 (1) ◽  
Author(s):  
Jonathan W. Loiacono ◽  
Chu-Fei H. Ho ◽  
Natalie V. Sierra ◽  
Domènec Jolis ◽  
Carolyn Chiu ◽  
...  
Keyword(s):  
San Francisco ◽  
Planning Process ◽  
Rainwater Harvesting ◽  
Control Plant ◽  
Management Plan ◽  
Urban Setting ◽  
Wastewater Management ◽  
Urban Watershed ◽  
Aging Infrastructure ◽  
The City

The City and County of San Francisco (“City”) embarked upon a 30-year master planning process in part prompted by public concerns related to the neighbourhood impacts of the Southeast Water Pollution Control Plant (SEP). The Sewer System Master Plan, as it is called, developed a long term Integrated Urban Watershed Management Plan for the City's treatment plants and collection system. This paper focuses on the planning framework and public input to the process, particularly as it relates to proposed changes to the SEP. The resulting improvements address issues of replacing aging infrastructure, eliminating odor emissions, and visually screening the treatment plants that are situated within an urban setting. The recommended project addresses the needed repair of the existing infrastructure; and proposes that the City move towards an integrated urban watershed approach, initially through localized rainwater harvesting and opportunistic water reclamation.

scholarly journals Seasonal Climate Impacts on Vocal Activity in Two Neotropical Nonpasserines

Diversity ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 319
Author(s):  
Cristian Pérez-Granados ◽  
Karl-L. Schuchmann
Keyword(s):  
Air Temperature ◽  
Daily Rainfall ◽  
Climatic Conditions ◽  
Dry Season ◽  
Climate Impacts ◽  
Calling Behavior ◽  
Wet Season ◽  
Focal Species ◽  
Calling Activity ◽  
Vocal Activity

Climatic conditions represent one of the main constraints that influence avian calling behavior. Here, we monitored the daily calling activity of the Undulated Tinamou (Crypturellus undulatus) and the Chaco Chachalaca (Ortalis canicollis) during the dry and wet seasons in the Brazilian Pantanal. We aimed to assess the effects of climate predictors on the vocal activity of these focal species and evaluate whether these effects may vary among seasons. Air temperature was positively associated with the daily calling activity of both species during the dry season. However, the vocal activity of both species was unrelated to air temperature during the wet season, when higher temperatures occur. Daily rainfall was positively related to the daily calling activity of both species during the dry season, when rainfall events are scarce and seem to act as a trigger for breeding phenology of the focal species. Nonetheless, air temperature was negatively associated with the daily calling activity of the Undulated Tinamou during the wet season, when rainfall was abundant. This study improves our understanding of the vocal behavior of tropical birds and their relationships with climate, but further research is needed to elucidate the mechanisms behind the associations found in our study.

Occupancy of two forest specialist birds in the Southern Mistbelt Forests of KwaZulu-Natal and Eastern Cape, South Africa

2020 ◽  
pp. 1-16
Author(s):  
S. THOBEKA GUMEDE ◽  
DAVID A. EHLERS SMITH ◽  
YVETTE C. EHLERS SMITH ◽  
SAMUKELISIWE P. NGCOBO ◽  
MBALENHLE T. SOSIBO ◽  
...  
Keyword(s):  
South Africa ◽  
Camera Trap ◽  
Habitat Requirements ◽  
Stem Density ◽  
Grass Cover ◽  
Eastern Cape ◽  
Wet Season ◽  
Mature Trees ◽  
Natural Habitats ◽  
Kwazulu Natal

Summary Establishing the specific habitat requirements of forest specialists in fragmented natural habitats is vital for their conservation. We used camera-trap surveys and microhabitat-scale covariates to assess the habitat requirements, probability of occupancy and detection of two terrestrial forest specialist species, the Orange Ground-thrush Geokichla gurneyi and the Lemon Dove Aplopelia larvata during the breeding and non-breeding seasons of 2018–2019 in selected Southern Mistbelt Forests of KwaZulu-Natal and the Eastern Cape, South Africa. A series of camera-trap surveys over 21 days were conducted in conjunction with surveys of microhabitat structural covariates. During the wet season, percentage of leaf litter cover, short grass cover, short herb cover, tall herb cover and saplings 0–2 m, stem density of trees 6–10 m and trees 16–20 m were significant structural covariates for influencing Lemon Dove occupancy. In the dry season, stem density of 2–5 m and 10–15 m trees, percentage tall herb cover, short herb cover and 0–2 m saplings were significant covariates influencing Lemon Dove occupancy. Stem density of trees 2–5 m and 11–15 m, percentage of short grass cover and short herb cover were important site covariates influencing Orange Ground-thrush occupancy in the wet season. Our study highlighted the importance of a diverse habitat structure for both forest species. A high density of tall/mature trees was an essential microhabitat covariate, particularly for sufficient cover and food for these ground-dwelling birds. Avian forest specialists play a vital role in providing ecosystem services perpetuating forest habitat functioning. Conservation of the natural heterogeneity of their habitat is integral to management plans to prevent the decline of such species.

scholarly journals The effects of greening the supplier and innovation on environmental performance and competitive advantage

2013 ◽  
Vol 7 (1) ◽  
Author(s):  
Unine Van den Berg ◽  
Jean-Pierre Labuschagne ◽  
Hugo Van den Berg
Keyword(s):  
South Africa ◽  
Competitive Advantage ◽  
Environmental Performance ◽  
Competitive Advantages ◽  
Latent Constructs ◽  
Confirmatory Factor ◽  
Environmental Goals ◽  
The City ◽  
Strength Of Association ◽  
Managerial Innovation

Companies in South Africa should realise the important influence of greening their suppliers and of innovation to achieve environmental goals and competitive advantages. In order to prove this, a questionnaire survey was conducted with 75 companies from 11 industries in the City of Johannesburg Metropolitan Municipality region, South Africa. A confirmatory factor analysis was done, followed by bivariate correlations to determine the strength of association between the latent constructs. Correlations between greening the supplier, innovation, environmental performance and competitive advantages were done. The research found that a green innovative process had a significant effect on environmental performance. Green managerial innovation further had a significant correlation with competitive advantage. The primary result of the study indicated that all the constructs positively related to each other, meaning that greening suppliers, by means of green innovation, leads to an enhanced environmental performance and to competitive advantages.

Language and the geopolitics of (dis)location: A study of Zimbabwean Shona and Ndebele speakers in Johannesburg

2018 ◽  
Vol 47 (1) ◽  
pp. 115-139 ◽  
Author(s):  
Gugulethu Siziba ◽  
Lloyd Hill
Keyword(s):  
South Africa ◽  
South African ◽  
Census Data ◽  
Strong Association ◽  
Geographic Location ◽  
Migration Literature ◽  
African Migrants ◽  
Social Positioning ◽  
Language And Ethnicity ◽  
The City

AbstractThe Zimbabwean diaspora is a well-documented phenomenon. While much research has been done on Zimbabwean migration to South Africa, the role that language plays in this process has not been well researched. This article draws on South African census data and qualitative fieldwork data to explore the manner in which Zimbabwean migrants use languages to appropriate spaces for themselves in the City of Johannesburg. The census data shows that African migrants tend to concentrate in the Johannesburg CBD, and fieldwork in this area reveals that Zimbabwean migrants are particularly well established in two suburbs—Yeoville and Hillbrow. The article explores migrant language repertoires, which include English, Shona, Ndebele, and a variant of Zulu. While many contributions to the migration literature tend to assume a strong association between language and ethnicity, the article shows how this relationship is mediated by geographic location and social positioning within the city. (Language, migration, Johannesburg, South Africa, Zimbabwe)*

Rain and the city: Pathways to mainstreaming rainwater harvesting in Berlin

Geoforum ◽  
2018 ◽  
Vol 89 ◽  
pp. 96-106 ◽  
Author(s):  
Natàlia García Soler ◽  
Timothy Moss ◽  
Ourania Papasozomenou
Keyword(s):  
Rainwater Harvesting ◽  
The City
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