The lawn: an ecological alternative for your retention basins

Do you know the role of retention basins? They mainly serve as a buffer between heavy rain and the management of urban rainwater infrastructure capacity, making it possible to significantly reduce the risk of flooding. The lawn, usually used in these basins as a ground cover, contributes to greening and is an integral part of the biodiversity found there, unlike mineralized ground covers. In addition, it offers significant ecological and practical advantages, such as delaying water overflow, because mature and well-installed grass acts as a filter belt and allows better water infiltration into the ground. However, to ensure the effectiveness of retention basins, Preparing the soil properly and selecting suitable plant varieties are crucial steps. The experts at Gazon Bastien reveal everything you need to know on the subject.

Soil preparation, the key to sustainability

The effective development of a retention pond requires careful soil preparation, with particular attention paid to the topsoil layer. One thickness of 8 to 10 inches of soil, especially on the lower slopes, is crucial to promote robust grass rooting, ensure good water retention and stabilize the slopes. The composition of the soil must be carefully balanced: sandy enough to facilitate drainage, without excess that would cause too rapid infiltration, while avoiding too high a clay content that would limit the oxygenation of the roots.

This balanced approach not only ensures optimal stormwater management, but also supports healthy plant growth, thus contributing to the overall efficiency and sustainability of the retention basin.

Species adapted for a sustainable result

Careful plant selection is crucial in bioretention projects, especially in restrictive environments such as industrial districts. In these contexts, the use of mature grass, cultivated for two years in fields, is an optimal solution. Species such as Kentucky bluegrass, known for their robust root systems and developed rhizomes, provide a solid, cohesive foundation. Diversification with other species such as fine fescue can enrich the biodiversity of plant areas. It is also essential to choose certified cultivars, such as those recognized by” NTEP ”, which guarantee better resistance and optimal development of the rhizomes, thus ensuring superior performance in difficult conditions.

As a turf producer, we are committed to fully valuing the Kentucky bluegrass while being an example of diversity in the marketplace. It is important to note that different types of turf may be useful, and that no variety is superior to another. The aim is to present inspiring examples, without imposing a one-size-fits-all approach or giving the impression of limiting choices.

Adequate plant maintenance is crucial to ensure the sustainability and profitability of investments in landscape design. In Quebec, sustainable practices are encouraged, in particular that of letting the grass reach a height of 4 inches. This method is particularly effective for moisture retention, especially in areas where irrigation is limited or absent. Longer turf requires less watering because it better preserves soil moisture, even during heatwaves. By adopting sustainable maintenance practices, responsible teams can significantly contribute to the more ecological and economical management of green spaces, while ensuring their resilience in the face of changing climate conditions.

The lawn as a natural filter

Beyond its aesthetic role, the lawn acts as a ground cover in the various types of facilities that manage rainwater. Thanks to its dense thatch and roots, turf slows the flow of water, retaining contaminants before they enter the ground. This process is essential for water drainage, as it limits the spread of unwanted particles in groundwater. Thus, using ground cover, such as mature turf, offers a natural solution to purify runoff and prevent erosion.

Biodiversity and sustainability: a solution for urban spaces

Integrating ground cover into retention basins also supports biodiversity. It is proven that turf is considered to be a large biomass and having a deep root system, it is effective in treating pollutants, reducing water volumes and resisting changes in soil humidity.

A ground cover, composed of various grass species, reduces irrigation needs, improves the resilience of ecosystems and contributes to more sustainable development. For cities and landscape architects, this type of development represents an ecological solution that integrates harmoniously into urban spaces while meeting the challenges of storm water management.

The Bastien difference

At Gazon Bastien, we invest in the health of our soils and the production of sustainable turf. Our rigorous methods include the introduction of recycled compost, an ongoing program of green manures, and regular soil tests to identify and correct deficiencies through appropriate amendments. We also conduct intensive scouting to prevent problems associated with insects, unwanted herbs, and fungal diseases. This meticulous attention to the soil allows the development of robust and durable turf, adapted to the specific needs of each project.

Our commitment to sustainability extends to water management, with rainwater harvesting systems and the renovation of some fields to be closer to the water table, thus reducing irrigation costs. We optimize our practices by adjusting mowing and irrigation according to the maturity of the turf, and use certified cultivars A-list. Our selection of seed blends is based on evaluations” NTEP ”, guaranteeing the quality and performance of each variety. With a touch of humor, we like to say that we are giving love by talking to them, underlining our dedication to producing the highest quality turf.

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