Stormwater Detention - Retention

For half a century, Green Roofs are essential in stormwater management on structures in Germany. Most of these historical Green Roofs still exist and more importantly their smart stormwater detention and retention capability still goes beyond the trendy one-size-fits-all systems with plant mono cultures.

Natural Water Cycle

Earth's water is always in movement, and the natural water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth.
Water is always changing states between liquid, vapor, and ice, with these processes happening in the blink of an eye and over millions of years.

With human interference - things will change...

Water is Life   -   Preserve it !  Learn about Natural Water Cycles

Nature is our Mentor

Urban Water Cycle

The urban water cycle is ‘man made’ created to provide drinking water to homes and businesses, to remove wastewater and sewage, and redirect stormwater away from homes and businesses and into our waterways

Meanwhile this 'man made' urban water cycle created with grey infrastructure is giving us serious problems.
Impervious sidewalks, streets, and buildings cover the soil, preventing infiltration and massively interrupting the natural water cycle. The consequences are soil erosion, destructive floods, water pollution, harmful algal blooms, lack of groundwater, and billions of dollars in damage every year. 

Sustainable, efficient and equitable urban water management has never been as important as intoday’s world

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By definition, a detention BMP is an area where stormwater is temporarily stored, or detained, and is eventually allowed to drain slowly when water levels recede in the receiving channel. On the other hand, retention stormwater BMPs hold or retain stormwater on a more permanent basis. The best illustration of this difference between the terms is a dry pond (retention) and a wet pond (detention). 
klima roof is the best of the two worlds on structures. 

Stormwater Retention:

Stormwater retention is the holding-back of water without releasing it.
For example, a bucket will retain all the water poured into it to the top rim of the bucket. If you pour more water in the bucket, it will overflow in the same amount as is poured in.

Ideally, on a Green Roof the water is retained in porous aggregates that mimic natural soil profiles that are ideal for resilient growth of the plants.
The plants require a suitable Air-to-Water ratio in order to utilize nutrients that will generate growth and sequester carbon dioxide.

Moisture release from the porous aggregates provides evaporative cooling of the Green Roof plants and consequently heat island effect is reduced as well. 

Stormwater Detention:

Stormwater detention is detaining stormwater for a limited and/or a defined time.
For example, if you have a small hole in the bottom of a bucket that is full of water, the water will slowly flow out through the hole. If additional water is poured into the bucket at a greater amount then is flowing through the hole, then the water will also overflow from the top.

Klima roof uses a composition of natural mineral aggregates that delay runoff for up to 10 hours. 

Additionally, with a Smart Drain the runoff will be contolled by the weather App and the demand of the plants. 

Stormwater Utilization and Smart Flow Control

We face a global challenge to responsibly use and protect our finite supply of freshwater, yet all too often we overlook ways to guard and extend this precious resource.

The ever increasing world population is outstripping nature’s ability to deliver clean water. We must seek out and implement smart practices that provide sustainable solutions for the world's increasing clean water needs.
Klima roof is the first true Green/Blue Roof system utilizing water from the built-in water reservoir. The subsurface grid technology allows redistribution of water to areas within the system where it is needed, or where the water demand of the vegetation is higher. The plants control the function, combined with actual weather data and an accurate forecast.

Optionally, klima roof's water reservoir can be recharged with the building’s grey water, eliminating the use of freshwater.

The combination of the mineral aggregates and the vegetation act as one of nature’s most sophisticated purification tools. 

No drop is wasted.


klima roof's modern Green Roof and Blue Roof technologies are based on natural water cycle systems, easily tailored for each project and scientifically proven for over 40 years.

There is no need to reinvent the wheel when you have nature as a guide.

Some of us are data collectors, others are focused on the vegetation and soil biology - klima roof can provide the best of both worlds. We don't sell a one-size-fits-all system, optimized for only one aspect and disregarding the other essential needs of the living vegetation. Healthy, thriving, and resilient green vegetation is what counts the most on a Green Roof.