Sawers won the non-Olympic K1 5000m event while there were silver medals for Ed McKeever, Liam Heath and Jon Schofield in the K1200m and K2 200m respectively.
“The 200m men were outstanding, both boats getting on the podium in their first big international race since the Olympic Games, so congratulations to them," said British team performance director John Anderson.
“I have been greatly encouraged by a number of the other performances from new crews and up and coming youngsters on the team.
"The women's K4 500m crew really upped their game to finish fourth and an eighth place in the A final of the men’s K2 1000m yesterday by Andy Daniels and Ed Rutherford was also very impressive.
“It was exciting to see youngsters Corrall Burkill and Hannah Brown make such a good start on their senior international debuts with Hannah’s second place in the B final being of particular note.
“Finally congratulations to Louisa Sawers winning gold in the K1 5000m, an event she clearly enjoys. We have a great deal to be optimistic about at this point in the season and we now move on to Racice next week.”
But Olympic champion McKeever, in his return to action following London 2012, admitted there was plenty of work to do after he was bested by Ecuador's Cesar De Cesare.
“It is very exciting to be back racing again. You never know what level everyone else is going to be, at the start of the season, so it is good to be able to benchmark yourself against them," he said.
“It wasn’t the perfect race for me by a long way and there is plenty of work to do. I will work with my coach Alex to look at things and generally try to bring my race together as a whole maintaining form throughout.”