5. The environmental challenges of waterways

Because the hydraulic network and its channels enable navigation, hydraulic management of navigation interacts with the environment in a comprehensive way, and in a way that is undoubtedly more marked than for other modes of transport.

We'll look at it from three angles:

• the first to deal with the comparative externalities of river transport in relation to other land modes (§ 5.1 ) insofar as these externalities condition the calculations of the socio-economic profitability of investments in the river sector;

• ...