Small hydroelectric schemes are often sited in mountainous areas where the natural processes of uplift and erosion are relatively rapid. Significant benefit has been drawn from the application of geomorphology to the siting and design of schemes in Peru. The technique is based on the use of existing air photography to detect processes which could threaten the viability of a proposed site (e.g. active earthflows or river erosion). The information is presented as a 1:5000 scale geomorphology or hazard map which provides the design engineer with an understanding of the likely geotechnical constraints at a proposed site, at low cost and in advance of a site visit.

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