Constructed Wetlands

Blumberg Engineers

Ingenieurbüro Blumberg

Gänsemarkt 10
D-37120 Bovenden

Detailed information in:

Wetland roofs - irrigated greed roofs for ecologically closed cycles

The construction of a marsh plant roof improves the life style of one’s home. It combines aesthetics and functionality in  a piece of nature, purifies wastewater and water and is used as natural air conditioning with a minimum of costs.

Marsh plants are cultivated on textile mats (fleece) and afterwards hauled on the roof. The shape and incline of the roof (up to 30°) can vary. After the plant mats are installed on roof, the vegetation will cover the whole area. The effect on rainwater retention relieves the sewerage system.

The roots of the plants absorb the nutrients of the water by using them for their growth. Marsh plants on roof are also able to filtrate suspended substances out of the air.

Marsh plants on roofs are not just used for the retention and purification of rainwater but also of various waste water types, for example municipal, commercial, agricultural and industrial waste water.

Another positive effect of wetland roofs is the protection of the roof skin against climatic extremes and sun radiation. Thus the lifetime of the roof will be prolonged.

Wetland roofs are a ‘natural air conditioning’, as the insulating effect and cooling by evapotranspiration of the plants are major advantages of this special green roof. This effect can be observed in the experimental station of the German Federal Agricultural Research Center in Braunschweig.

Sumpfpflanzendach, Klimadach

     Wetland Roof Rainwater Harvesting

For more detailed information on wetland roofs visit us at

Wetland Roofs as a part of blue-green infrastructure and closed cycles

modern blue-green infrastructure

ecohydrologically closed cycles for modern blue-green infrastructure

You can find our publications on wetland roofs under the following links:

Blumberg, M. (2020): Wetland roofs -a multifunctional green roof type - Basics and perspectives from engineering practice. Long version presentation  "Closed Cycles and the Circular Society", Symposium in Wädenswil, Switzerland, 2. - 4. September 2020. Organizer: Zurich University of Applied and International Ecological Engineering Society (IEES).

Blumberg, M. (2019): Sumpfpflanzendächer aus der Sicht des Planers - Grundlagen und Perspektiven aus der Praxis. In: Zehnsdorf, A., Trabitzsch, R. (Hrsg.) Sumpfpflanzendächer – Themenheft zum Projekt Forschungsgründach. Helmholtz-Zentrum für Umweltforschung, (ISBN 978-3-944280-07-3), S. 30 - 41.

Zehnsdorf, A., Willebrand, K. C. U., Trabitzsch, R., Knechtel, S., Blumberg, M., Müller, R. A. (2019): Wetland roofs as an attractive option for decentralized water management and air conditioning enhancement in growing cities - A Review. In: Water2019, 11(9), 1845;

Zehnsdorf, A., Blumberg, M., Müller, R. A. (2019): Helophyte mats (wetland roofs) with high evapotranspiration rates as a tool for decentralised rainwater management – process stability improved by simultaneous greywater treatment, Water Science and Technology: Water Supply, Dezember 2019

Zehnsdorf, A., Stock, N., Richter, J., Blumberg, M., Müller, A. R. (2016): Grauwasserreinigung mit einer Sumpfpflanzenmatte unter Praxisbedingungen, in Chemie Ingenieur Technik, 88, No. 8, 1138-1144.

Blumberg, M. (2011): Sumpfpflanzendächer als Variante der Dachbegrünung, in
GWF Praxiswissen, Band 1, Regenwasserbewirtschaftung , ISBN 978-3-8356-3257-8.

Blumberg, M. (2010): Sumpfpflanzendächer, eine besonders vielseitige innovative Variante der Dachbegrünung, in GWF Wasser Abwasser, 151. Jahrgang / Heft 6, Essen, S. 568-571.