6. It is prohibited to install a catchment work in an area subject to flooding with a recurring period of between 0 to 20 years, unless it is to replace a catchment work existing on 15 June 2002. In such case, a tube well that complies with the standards provided for in subparagraphs 1 to 3 of the second paragraph of section 10 may be installed provided that the casing rises above the ground surface at a sufficient height to prevent possible immersion.