EconPapers    
Economics at your fingertips  
 

Integrated modelling for economic valuation of the role of forests and woodlands in drinking water provision to two African cities

Biniam B. Ashagre, Philip J. Platts, Marco Njana, Neil D. Burgess, Andrew Balmford, R. Kerry Turner and Marije Schaafsma

Ecosystem Services, 2018, vol. 32, issue PA, 50-61

Abstract: Rapidly growing economies often have high population growth, resulting in agricultural expansion in rural areas and increased water demand in urban areas. Conversion of forests and woodlands to agriculture may threaten safe and reliable water supply in cities. This study assesses the regulating functions and economic values of forests and woodlands in meeting the water needs of two major cities in Tanzania and proposes an integrated modelling approach with a scenario-based analysis to estimate costs of water supply avoided by forest conservation. We use the process-based hydrological Soil and Water Assessment Tool (SWAT) to simulate the role of woody habitats in the regulation of hydrological flow and sediment control. We find that the forests and woodlands play a significant role in regulating sediment load in rivers and reducing peak flows, with implications for the water supply from the Ruvu River to Dar es Salaam and Morogoro. A cost-based value assessment under water treatment works conditions up to 2016 suggests that water supply failure due to deforestation would cost Dar es Salaam USD 4.6–17.6 million per year and Morogoro USD 308 thousand per year. Stronger enforcement of forest and woodland protection in Tanzania must balance water policy objectives and food security.

Keywords: Ecosystem services; SWAT; Tanzania; Soil erosion; Urban water demand; Land use (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations View citations in EconPapers (1) Track citations by RSS feed

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S2212041617305089
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:ecoser:v:32:y:2018:i:pa:p:50-61

Access Statistics for this article

Ecosystem Services is currently edited by Leon C Braat

More articles in Ecosystem Services from Elsevier
Bibliographic data for series maintained by Dana Niculescu ().

 
Page updated 2018-12-01
Handle: RePEc:eee:ecoser:v:32:y:2018:i:pa:p:50-61