Improved calculation of sediment growth and maintenance frequency in wet ponds and underground basins

The calculations in StormTac Web now take into account facilities in series so that for each facility of the pond/wetland type, underground basin with filter cassette and underground sedimentation basin in the results report, you can see the sediment growth rate (mm/year) and number of years until sediment removal. The calculations also take into account other types of facilities in the series that are placed upstream and which increase the time for maintenance because they separate part of the sediments before they enter the facility downstream.

It is recommended that in each project with design of wet ponds, wetlands and underground basins with or without filter cassettes, see the maintenance frequency calculated for the current design of the facility and especially its bottom surface, which may result in increased size of the facility. It is not only the required treatment and flow detention that affect the dimensioning, but also the calculated maintenance frequency.