RESERVOIR SEDIMENTATION ASSESSMENT GUIDELINE - Aneel

Reservoir Sedimentation Assessment GuidelineSUMMARYRESERVOIR SEDIMENTATIONASSESSMENT GUIDELINE1. Introduction.................................................................................................. 52. Reservoirs with sedimentation problems in Brazil...................................... 73. Deposition of sediments in reservoirs….............……….……………........ 74. The relevance of the sedimentation assessment survey for hydropowerplants ……....................………………………………………………....... 94.1 Inventory stage ……….................................……………………........104.2 Feasibility and basic project stages …… ......................................……104.3 Operational stage ..............……..........................……………….......... 115. Factors affecting sediments yield ……............………............................... 146. Reservoir sedimentation assessment …………................................................... 126.1 Reservoir data ............................................................…….............. 137. Sediment production determination...........................................…………......... 137.1 Erosion assessment....................................................................…....... 157.2 Sedimentometric gaging stations networking……..................…......... 157.3 Gaging station installation and measurement frequency …….............. 167.4 Measurement methods......................................................................... 177.4.1 Sediment sampling………................................................... 237.4.2 Laboratory analysis...............................................…........... 257.4.3 Sediment discharge computation............................................ 277.5 Data Analysis …………..................................................................... 307.5.1 Continuous, hourly and daily measurements.............…......... 317.5.2 Eventual measurements.....................................………......... 327.5.3 Data regionalization.............................................……......... 368. Reservoirs Trapping Efficiency ………………………...................................... 388.1 Medium and large reservoirs cases ……............................................ 388.2 Small reservoirs case …...............................………........................... 399. Specific weight of deposits.............................................……………………... 429.1 Computed ............................................................................................ 429.2 Measured .............................................................................................. 449.3 Estimate .............................................................................................. 44ANEEL – Brazilian Electricity Regulatory Agency / SIH – Hydrologic Studies and Information Department2