As an independent consultant in the field of sustainable water management and drainage technology, I advise on a project basis when removing complex roofs. Both roofs (case study) and (roof) renovation. The design and calculation of drains, traditional or vacuum/underpressure are also possible. I carry out roof drainage inspections on functionality of existing stormwater drains and the capacity of terrain pipes in relation to the current precipitation climate and applicable regulations. And I give advice on sustainable water management, possibilities for storage and prevention of flooding in the case of heavy precipitation. In this role I gained over 20 years of experience at Wavin. I also supervise BIM processes where the focus is on installation technology. Since 2012 I have been involved with BIM from the supplier. Components include: training in the use of specific content, the right application within a model and monitoring of W installations and organizational building of a team, where the individual strength points are known, recognized and deployed in the right place in a team. In addition, training needs and needs to be in favour of the team can also be considered. Individual or team coaching to get the most out of the team.