ECONOMIC EVALUATION OF WATERSHED PROJECTS ‐ AN OVERVIEW METHODOLOGY AND APPLICATION<sup>1</sup>

Brooks, Kenneth N.; Gregersen, H. M.; Berglund, Erika; Tayaa, Mhammed

doi:10.1111/j.1752-1688.1982.tb03967.x

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…This study illustrates a practical approach to assessing the economic performance of a watershed management program in the Beijing municipal area. As with similar studies in Morocco (Brooks et al, 1982) and Taiwan (Wang et al, 1998), the methodology of Gregersen et al (1987) proved useful. As with these previous studies, the economic appraisal of watershed management practices indicated that they were economically viable and should be sustained.…”

Section: Discussionmentioning

confidence: 72%

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT¹

Shuhuai

Geng

Gregersen

et al. 2001

J American Water Resour Assoc

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Watersheds above the Miyun reservoir, a principal source of surface water for Beijing, are designated to be managed for water production, but under the principle of multiple use. Because of the scarcity of arable land, these watersheds cannot be managed only for drinking water. Efforts are under way to reduce sediment delivery, improve the quality of water entering Miyun reservoir, and improve the welfare of watershed inhabitants. An economic appraisal of a watershed management project for the 3,298‐ha Shixia watershed above the Miyun reservoir, indicates a 24 percent economic rate of return on the investment made in the project. The net present value (NPV) of the project, calculated at a discount rate of 10 percent, is approximately US$3.49 million. Sensitivity analyses indicate that a doubling of labor costs lowers the NPV to US$2.07 million and a 10 percent decrease in benefits lowered the NPV to US$2.87. It is concluded that the implementation of conservation practices on the Shixia Demonstration Watershed represent an economically efficient use of resources.

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Section: Discussionmentioning

confidence: 72%

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT¹

Shuhuai

Geng

Gregersen

et al. 2001

J American Water Resour Assoc

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“…The analysis requires conversion of the weight of the sediments to volume and the speci® c weight of 1.5 t/m 2 was used in this conversion. This value is taken from Brooks et al (1982) and is near the average value of the Sri Lankan estimates of 1.72± 0.75 (CECB, 1978) and 1.98 (NEDECO, 1984). A linear relationship was assumed between sediment deposits and reduction of live storage capacity.…”

Section: Estim Ation Of Cost Of Sedime Ntationmentioning

confidence: 73%

The Economics of Reservoir Sedimentation: A Case Study of Mahaweli Reservoirs in Sri Lanka

Gunatilake¹,

Gopalakrishnan²

1999

International Journal of Water Resources Development

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Bene® ts of water resource projects often fall short of original expectations owing to sedim entation of reservoirs. This study estimates the cost of reservoir sedimentation in M ahaweli reservoirs including impact on hydropower production, irrigation w ater supply, extra cost of water puri® cation and loss of ® sheries yields. The present value of the cost of sed im entation is estimated to be U S$26 406 62 0. Of the different types of costs, lost hydropower production is the m ost signi® cant as it accounts for 66.6% of the total cost. The bene® ts of prevention of reservoir sedimentation alone are inadequate to com pensate for the costs involved. Using soil erosion control measures at farm level offers a better solution for reservoir sedimentation com pared with de-silting. A mong the available erosion control methods, stoned terrace is the least-cost solution to reservoir sedimentation.

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“…In contrast, studies conducted on lowland and hot lowland agroecologies (Benishangul and SNNP) covered only small areas (6.4%), as indicated in Figure 3. This is because the focus of these areas is not on soil erosion, but rather on water conservation by constructing water‐harvesting dams and reservoirs for domestic, irrigation, and livestock consumption (Brooks & Tayaa, 2003).…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of physical soil and water conservation measures under simulated and observed dataset in Ethiopia: Meta‐analysis

Abebe,

Tesfay,

Lemma

et al. 2024

Land Degrad Dev

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To combat land degradation through conserving soil and water resources, Ethiopia has undergone vigorous implementation of soil and water conservation (SWC) measures, predominantly physical structures. To evaluate the effectiveness of these implemented structures, various researches have been conducted through using both measured and simulated approaches. This study was initiated to analyze the reliability of SWAT‐based simulated studies results on the effectiveness of SWC measures toward erosion reduction potential against the measured dataset using unpaired t‐test statistical analysis. In this study, 123 published papers were downloaded, of which 70 were found to be more related to the objective of the review. After applying four refining criteria, only 43 were found more compatible with the study objective and used for data analysis. Studies conducted by different scholars show up to 98% and 93.50% soil loss reduction effectiveness by SWC measures in measured and simulated approaches, respectively. The simulated SWC measure efficiency output was also evaluated with respect to the ground‐measured data of the same structure within the same agroecology class. Finally, the unpaired t‐test results indicated that the grass strip in the mid‐highland agroecology showed a significant difference from the measured one at a 95% significance level. However, none of the other measures showed significant differences between the measured and simulated datasets. Hence, the SWAT model can effectively simulate the effectiveness of physical SWC measures on soil loss reduction if it is well‐calibrated and validated with sediment yield data. Refining model parameters that can be sufficiently captured and represent biological measures (grass strip), incorporating additional field data for calibration and validation coupled with exploring alternative modeling approaches that efficiently simulate biological SWC was set as a recommendation to obtain an effective biological measure simulation.

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ECONOMIC EVALUATION OF WATERSHED PROJECTS ‐ AN OVERVIEW METHODOLOGY AND APPLICATION¹

Cited by 14 publications

References 2 publications

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT¹

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT¹

The Economics of Reservoir Sedimentation: A Case Study of Mahaweli Reservoirs in Sri Lanka

Effectiveness of physical soil and water conservation measures under simulated and observed dataset in Ethiopia: Meta‐analysis

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ECONOMIC EVALUATION OF WATERSHED PROJECTS ‐ AN OVERVIEW METHODOLOGY AND APPLICATION1

Cited by 14 publications

References 2 publications

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT1

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT1

The Economics of Reservoir Sedimentation: A Case Study of Mahaweli Reservoirs in Sri Lanka

Effectiveness of physical soil and water conservation measures under simulated and observed dataset in Ethiopia: Meta‐analysis

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Product

Resources

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ECONOMIC EVALUATION OF WATERSHED PROJECTS ‐ AN OVERVIEW METHODOLOGY AND APPLICATION¹

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT¹

PROTECTING BEIJLNG'S MUNICIPAL WATER SUPPLY THROUGH WATERSHED MANAGEMEN AN ECONOMIC ASSESSMENT¹