RESERVOIR SEDIMENTATION ASSESSMENT GUIDELINE - Aneel

Reservoir Sedimentation Assessment Guideline• Collection and analysis of bed sediment – Aiming at providing subsidies for theadequate estimate on Manning coefficient for backwater studies, a reservoir bedsediment collection shall be performed at every 4 cross-sections, as well as nearbythe dam. Such sampling shall be forwarded to the laboratory for the granulometricanalysis.11.5 Bed mappingThe selected map shall have a scale suitable for the reservoir size; the marksshall be plotted, as well as heights, position of rulers and other data such as topographicleveling line and others.Once having the field cards (work with traditional methods) or the electronicrecords (work with modern techniques) and additional information, the next step is toplot the sections in the map, with the selected scale, and record depths (Figure 11.8).The measured depths must be adjusted based on the rulers reading.ANEEL – Brazilian Electricity Regulatory Agency / SIH – Hydrologic Studies and Information Department63