The Spurs boss played a 3-4-2-1 formation with Eric Dier joining Jan Vertonghen and Toby Alderweireld in a back three designed to negate the threat of Hornets star Odion Ighalo and Troy Deeney.
Although Ighalo scored Watford's goal, after receiving a header from Deeney, Pochettino indicated that his approach helped produce such a result to allow his side to momentarily moved into third position on the Premier League table.
"We play always with Eric like a holding midfielder but the way that they play and what we analysed, we found that they play a lot of long balls to make it dangerous for the opponent," Pochettino said.
"So it was a good solution to give calm to the team and manage the game from the back.
"I was only a little bit disappointed with the way that we conceded the goal. At 1-0 up we should have killed the game and scored more goals."
Erik Lamela scored the opener for Spurs in the 17th minute before Ighalo responded four minutes before half-time.
Watford left-back Nathan Ake was sent off just after the hour-mark for a high challenge on Lamela before Son Heung-min came up with a deft backfield touch to send home Kieran Trippier's cross in the 89th minute.