Rain tax

More and more Polish municipalities shall pay “the rain tax”, depending on the volume of surface drained the sewage system.
Company Progea Consulting offers an innovative solution in the form of GIS databases. Spatial analysis made based on the statial data provide accurate information on land development.
Our offer is addressed to the local authorities and water – sewage systems, which use the experience of other Polish cities are expected to enable accurate analysis of geo new look at stormwater service, depending on the individual needs of their residents and clients.

Legal basis:

  • “Act on collective water supply and sewage collection” on June 7, 2001. (Journal of Laws No. 72, item. 747)
  • “Regulation of the Minister of Construction on the determination of tariffs, design an application for approval of tariffs and conditions of payment for collective water supply and collective sewage” dated 28 June 2006 (Journal of Laws No. 127, item. 886).

Spatial analysis of the drainage of rainwater are based on an individual approach to land use planning each property.

The study area is classified due to water permeability. This is done on the basis of:

  •  large-scale aerial orthophotos (scale 1:200 or greater)
  •  cadastral map in digital form
  •  building conditions (depending on customer preference)

In the case of absence of digital map, we also vectorization analogue maps.
Steps to build the GIS database:

  •  Gaining the edge of the roof (3D environment)
  •  Topological control of integrated accounting data (the boundaries of the parcels, buildings)
  •  Classification of buildings due to the function of use. Determination of the main directions of rainwater runoff from rooftops
  •  Acquiring information about the level of permeability landscaping elements

Application of GIS database:

  • information on the permeability of landscaping elements for each property
  • calculate statistics on the amount of permeable and impermeable surfaces – estimate the cost of sewage disposal in the municipality
  • current and topologically correct factual information management of the site that are widely used in other fields of spatial communities