International Conference New Trends in Water and Environmental Engineering for Safety and Life: Eco-compatible Solutions for Aquatic Environments

In this paper design criteria of pool and weir, orifice and vertical slot fishways are proposed. Each criterion is based on the need to conciliate the hydraulic lows controlling flow conditions in the manufact and the biological exigencies of the fish species for which the fishway is designed. These exigencies mainly regard the minimum ecological discharge and water depth and velocity suitable for the aquatic ecosystem preservation, the minimum acceptable size of a pool, enough to remove any possible cause of delay in the fish migration, orifice size and shape

Minimum instream flow and sediment transport to reservoirs: the influence of river morphology

The knowledge of the morphological dynamics of water courses is essential to approach the management problems, such as reservoir sedimentation and minimum instream flow, generated by river barrages. Comparing test observations for two reservoirs in Basilicata (Italy), this paper shows how the effectiveness of the hydraylic works, aimed to reduce sediment transport along the fluvial network and prevent part of the sediment discharge from reaching the lake, is dependent on the river type. With reference to the weir on the River Basento, the present review suggests that fluvial modelling phenomena knowledge playies a preminent role on the possibility to define a method to calculate the minimum ecological discharge in braided alluvial beds downstream from weirs