Batch for PostgreSQL query
You are passing the username incorrectly:

The "short" parameter names don't use the = sign:

So it should either be: 

psql -e -a -f"C:\Users\utente\Desktop\1Giswater impNode.sql" -dpostgres  -Upostgres


or, when using the long parameter names: 

psql -e -a --file="C:\Users\utente\Desktop\1Giswater impNode.sql" --dbname=postgres  --username=postgres