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The impact of forest thinning on the reliability of water supply in central Arizona.

Simonit S, Connors JP, Yoo J, Kinzig A, Perrings C - PLoS ONE (2015)

Bottom Line: Economic growth in Central Arizona, as in other semiarid systems characterized by low and variable rainfall, has historically depended on the effectiveness of strategies to manage water supply risks.Traditionally, the management of supply risks includes three elements: hard infrastructures, landscape management within the watershed, and a supporting set of institutions of which water markets are frequently the most important.This represents an estimated net present value of surface water storage of $104 million, considering both water consumption and hydropower generation.

View Article: PubMed Central - PubMed

Affiliation: EcoServices Group, School of Life Sciences, Arizona State University, Tempe, United States of America; International Union for Conservation of Nature (IUCN), Regional Office for Mexico, Central America and the Caribbean, San Josè, Costa Rica.

ABSTRACT
Economic growth in Central Arizona, as in other semiarid systems characterized by low and variable rainfall, has historically depended on the effectiveness of strategies to manage water supply risks. Traditionally, the management of supply risks includes three elements: hard infrastructures, landscape management within the watershed, and a supporting set of institutions of which water markets are frequently the most important. In this paper we model the interactions between these elements. A forest restoration initiative in Central Arizona (the Four Forest Restoration Initiative, or 4FRI) will result in thinning of ponderosa pine forests in the upper watershed, with potential implications for both sedimentation rates and water delivery to reservoirs. Specifically, we model the net effect of ponderosa pine forest thinning across the Salt and Verde River watersheds on the reliability and cost of water supply to the Phoenix metropolitan area. We conclude that the sediment impacts of forest thinning (up to 50% of canopy cover) are unlikely to compromise the reliability of the reservoir system while thinning has the potential to increase annual water supply by 8%. This represents an estimated net present value of surface water storage of $104 million, considering both water consumption and hydropower generation.

No MeSH data available.


Related in: MedlinePlus

Net Present Value (NPV) of forest thinning over 20 years across the SRP watershed.a) constant water demand; b) 2.7% annual increase in water demand.
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pone.0121596.g004: Net Present Value (NPV) of forest thinning over 20 years across the SRP watershed.a) constant water demand; b) 2.7% annual increase in water demand.

Mentions: Taken over a 20-year time horizon, the net present value (NPV) of the reduced cost of water from avoided groundwater and CAP water use, was found to be US$ 2.4 million at a 2% discount rate (Fig. 4A and Table 3). Assuming constant water demand, thinning at this level does result in a slight increase in expected surface water supply, and a matching reduction in groundwater pumping. The reduction in pumping generates a lower drawdown effect at the wells, leading to a fall in average pumping cost. This produces a small reduction in the mean water price over 20 years from 14.4 to 14.2 $ AF-1.


The impact of forest thinning on the reliability of water supply in central Arizona.

Simonit S, Connors JP, Yoo J, Kinzig A, Perrings C - PLoS ONE (2015)

Net Present Value (NPV) of forest thinning over 20 years across the SRP watershed.a) constant water demand; b) 2.7% annual increase in water demand.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4383454&req=5

pone.0121596.g004: Net Present Value (NPV) of forest thinning over 20 years across the SRP watershed.a) constant water demand; b) 2.7% annual increase in water demand.
Mentions: Taken over a 20-year time horizon, the net present value (NPV) of the reduced cost of water from avoided groundwater and CAP water use, was found to be US$ 2.4 million at a 2% discount rate (Fig. 4A and Table 3). Assuming constant water demand, thinning at this level does result in a slight increase in expected surface water supply, and a matching reduction in groundwater pumping. The reduction in pumping generates a lower drawdown effect at the wells, leading to a fall in average pumping cost. This produces a small reduction in the mean water price over 20 years from 14.4 to 14.2 $ AF-1.

Bottom Line: Economic growth in Central Arizona, as in other semiarid systems characterized by low and variable rainfall, has historically depended on the effectiveness of strategies to manage water supply risks.Traditionally, the management of supply risks includes three elements: hard infrastructures, landscape management within the watershed, and a supporting set of institutions of which water markets are frequently the most important.This represents an estimated net present value of surface water storage of $104 million, considering both water consumption and hydropower generation.

View Article: PubMed Central - PubMed

Affiliation: EcoServices Group, School of Life Sciences, Arizona State University, Tempe, United States of America; International Union for Conservation of Nature (IUCN), Regional Office for Mexico, Central America and the Caribbean, San Josè, Costa Rica.

ABSTRACT
Economic growth in Central Arizona, as in other semiarid systems characterized by low and variable rainfall, has historically depended on the effectiveness of strategies to manage water supply risks. Traditionally, the management of supply risks includes three elements: hard infrastructures, landscape management within the watershed, and a supporting set of institutions of which water markets are frequently the most important. In this paper we model the interactions between these elements. A forest restoration initiative in Central Arizona (the Four Forest Restoration Initiative, or 4FRI) will result in thinning of ponderosa pine forests in the upper watershed, with potential implications for both sedimentation rates and water delivery to reservoirs. Specifically, we model the net effect of ponderosa pine forest thinning across the Salt and Verde River watersheds on the reliability and cost of water supply to the Phoenix metropolitan area. We conclude that the sediment impacts of forest thinning (up to 50% of canopy cover) are unlikely to compromise the reliability of the reservoir system while thinning has the potential to increase annual water supply by 8%. This represents an estimated net present value of surface water storage of $104 million, considering both water consumption and hydropower generation.

No MeSH data available.


Related in: MedlinePlus