We recall Krichever's construction of additional flows to Benney's hie
rarchy, attached to poles at finite distance of the Lax operator. Then
we construct a 'dispersionful' analogue of this hierarchy, in which t
he role of poles at finite distance is played by Miura fields. We conn
ect this hierarchy with N-wave systems, and prove several facts about
the latter (Lax representation, Chern-Simons-type Lagrangian, connecti
on with Liouville equation, tau-functions).