The reasons were:
- Natura 2000 nature protection area designation,
- The Pilis Park Forest is in the affected area,
- Bodzás ditch is a prime locally protected natural area.
The expansion of the stormwater receiving Bodzás - ditch into a stormwater reservoir, and wetland, was not only beneficial from a stormwater management point of view, but it contributed substantial to the local nature and bird conservation efforts. It also gave an impetus to the educational (developing nature trail) and tourism activities.
In order to ensure the protection of these sensitive recipients before the rainwater discharge, a one PURECO ENVIA TRP type oil and supended solid filtration unit was designed.