With the coming into force of the new Federal Act on Water Retaining Facilities as well as the corresponding Water Retaining Facilities Ordinance of January 1st 2013, a revision of the old guidelines of 2002 has been necessary, taking the experience made so far into account.
Link: https://www.bfe.admin.ch/bfe/en/home/supply/supervision-and-safety/dams/guidelines-and-tools.html