电灌站涵管式中层取水防螺工程费用一效益分析

目的评价电灌站涵管式中层取水防螺工程费用一效益，为现场推广应用提供科学依据。方法采用效益成本（费用）比率法对“涵管式中层取水”防螺工程进行费用效益分析，但不考虑间接成本和间接效益，各项费用均按2005年价格计算。结果 “涵管式中层取水”防螺工程直接成本为3.4万元，实施防螺工程后效益期可节约防治费用达101.1万元，净效益为97.7万元，净效益费用比率为28.7：1。结论 “涵管式中层取水”防螺技术投入少，效益高，具有广宽的应用前景和推广应用价值。

Cost-benefit analysis of project with mode of collecting water from middle layer of water body by culvert pipelinet

Objective  To evaluate the cost-benefit of the project with the mode of collecting wa-ter from middle layer of water body by the culvert pipelinet. Methods  The cost-benefit analysiswas carried out by the way of benefit-cost ratio for the project with the mode of collecting waterfrom middle layer of water body by the culvert pipelinet without indirect cost and indirect benefit,and according to the price of 2005. Results  The direct costs was 34 thousand yuans in the projectwith the mode of collecting water from middle layer of water body by the culvert pipelinet. Thesaved costs of prevention and treatment were 1 011 thousand yuans, the net benefit was 977 thou-sand yuans and the net benefit-cost ratio was 28. 7 : 1 following the project implemented. Conclu-sion  The investment is small but the benefit is high in the project of collecting water from middlelayer of water body by the culvert pipelinet. The technique has the notable worthiness of applica-tions.