This breakwater armour unit calculator is powered by Javascript. The flange check calculator was used as a basis to design this armour unit calculator. The development of the flange check calculator has taken weeks as this calculator was build in a few hours. There are some checks build in. The site where it was used for is later hosted by an institute specialised in copying other persons content. So they are cheap in more than one way. In this breakwater armour unit calculator the mistakes that have been removed that remained in the 'active copy' on my clients site. Since these people are so clever to copy other peoples work, they have copied the mistakes that came with it. Although I put a copyright on the site since I was payed per hour, this company thinks they can abusively copy the interlectual work of others. Pictures are better protected.