Rainwater harvesting: A case study on the potential of using rainwater harvesting from roofs as a supplementary water supply in Beja, Portugal
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Water scarcity is one of the most severe threats to societies and will likely affect increasingly many regions due to the combined effects of climate change, population increase and urbanization. One way to diminish the stress upon the potable mains water in water scarce regions is by harvesting rainwater. This has been investigated in this case study on the potential for rainwater harvesting from roofs as a supplementary water supply in the town of Beja in the semi-arid southern Portugal. The potential yield after spillage (YAS) was estimated using simple remote sensing and related to the current water demand. The main obstacles for an implementation of rainwater harvesting in Beja have been identified through an interview study with semi-structured questions with nineteen residents and representatives from three water authorities in Beja together with a literature study. The YAS was estimated to 20-27 m3 /person/year for an average rainfall year which represents 29 - 39 % of the annual water demand. For a low rainfall year the potential yield is 12-17 m3 /person/year (18-24 % of the water demand) and for a high rainfall year it is 36-49 m3 /person/year (53-72 % of the water demand). The main obstacle for an implementation of rainwater harvesting in Beja seems to be that in general, the residents do not regard their water supply as problematic. That makes it unlikely that they would take the initiative to implement it. If rainwater harvesting was to be included in governmental policy documents it could be promoted by the local water authorities that share a positive view on rainwater harvesting and believes it should be implemented in Beja. The lack of rainwater harvesting in governmental guidelines and the lack of private companies and non-governmental organizations promoting rainwater harvesting in Portugal can be identified as other obstacles towards its implementation.
Place, publisher, year, edition, pages
2011. , 37 p.
Rainwater harvesting, Water supply, Roofs, Supplementary Water Supply, YAS, Portugal, Beja, Semi-Arid
Oceanography, Hydrology, Water Resources
IdentifiersURN: urn:nbn:se:su:diva-59772OAI: oai:DiVA.org:su-59772DiVA: diva2:435404
UppsokLife Earth Science