Some say that the danger posed by water is worse than that of fire. In effect I fear both. However, either if you live in a city or in a provincial town, there is always a risk, higher or lower, to be flooded by water. For those who do not want to suffer passively the events, here is a practical guide to build "Do it yourself" bulkheads against flooding. With some good will and time, you can build a low cost efficient system with simple materials. This guide is intended for everybody, but in particular for people who are not professional in this field.