JUSTIFICATION OF CHANGE OF THE ARRANGEMENT OF ALIGNMENTS OF DAMS AT COMPLEX USE OF WATER RESOURCES OF HYDROGRAPHIC DEMARCATION OF THE MANABA

In 1990, it agrees with the Integral development plan for water resources of Demarcation of Manabi - (PHIMA), for flood of the territory in the field of an irrigation and water supply, 7 projects of complex appointment were identified. For each of them, as a first approximation, the corresponding alignment for an arrangement of a dam is offered and the preliminary sizes of the main hydraulic engineering constructions are determined. Since then there passed 26 years and the offered alignments and topographical and hydrometeorological information for projection of reservoirs, taking into account time, could influence the accuracy of the end results. On the basis of actual hydrometeorological and topographical data, the scheme of development of water resources for hydrographic demarcation of Manabi, Ecuador is offered. In the article, advantages of a new arrangement of alignments of dams are given to Ayampe, Sancan, Cayo, Jama and Coaque that will lead to the considerable decrease of social and ecological consequences, and also the sizes of hydraulic engineering constructions with decrease in the material and labor inputs at construction.

words: useful volume, dead volume, elevation of the dam crest, evaporation, envi- ronmental flow