The Arzal dam also encouraged the development of new recreational activities
such as yachting. Sailing is now highly developed in the area (Fig. 6.5), with an
average of 18,000 boats crossing the dam per year, and approximately 85–90 % of
boat crossings occurring during May to October, thus, during the low-flow period
(see Sect. 6.3.1). Sailing and fish passages have, however, an influence on the
quality of the water in the reservoir. Freshwater quality in the reservoir can be
Fig. 6.5 A yachting marina in the Vilaine River before the Arzal dam (Source La Jeunesse I., with
authorization)
Fig. 6.6 The lock of the Arzal dam (Source IAV, with authorization)
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such as yachting. Sailing is now highly developed in the area (Fig. 6.5), with an
average of 18,000 boats crossing the dam per year, and approximately 85–90 % of
boat crossings occurring during May to October, thus, during the low-flow period
(see Sect. 6.3.1). Sailing and fish passages have, however, an influence on the
quality of the water in the reservoir. Freshwater quality in the reservoir can be
Fig. 6.5 A yachting marina in the Vilaine River before the Arzal dam (Source La Jeunesse I., with
authorization)
Fig. 6.6 The lock of the Arzal dam (Source IAV, with authorization)
120
I. La Jeunesse et al.