Leca® Lightweight Aggregate (LWA) is well suited for infiltration, detention and treatment of stormwater and floods.

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Climatic change leads to increased rain and more extreme and unpredictable weather. Unfortunately, for the general population it is areas of dense and impermeable urban areas which are especially exposed.

Along with other measures, local management of rainwater can reduce storm water overload on the drainage system, and thus minimize the risk of flooding.

As an alternative to costly and inflexible expansion of drainage pipes and systems, this brochure shows how it is possible to manage rainwater through detention, evaporation or infiltration methods where the precipitation first falls.

Managing rainwater locally will contribute to keeping storm water from overloading drainage pipes, but in order for the water management system to perform well - it is important that the local solutions are scaled and designed correctly. There are many different methods for managing storm water locally. Some are based on natural and basic principles, others are more advanced and technical. This brochure presents where and how Leca LWA can be used in different solutions, depending on the local
requirements.

Determining which water management system works best will be
defined partly by the infiltration requirements, based on the needs and wishes of the user and what additional value the solution should add to the water management operation.

How can Leca® LWA contribute?

Storage and infiltration of water
Proper temporary storage reduces the dangers of flash flooding and provides a steady and manageable flow of water. Leca LWA has a large air volume/percentage of voids between the grains where water are stored.

The Leca LWA absorbs water and pre-crushed aggregates have even higher capacity. After the water is absorbed, it will seep into the ground or slowly discharge into the drainage system. This reduces the risk of flooding and provides a steady and manageable flow of water.

Water detention
Leca LWA has a special, porous structure and an abundance of voids between the grains. This property allows temporary absorption of water and delays the water flow, so the total load of water from fierce downpours are detained and slowly drained away.

Drainage
Leca LWA has properties which make it great for innovating drainage applications. Water that flows along drainage lines and enters permeable surfaces, can quickly be diverted. Larger and rounder Leca LWA grains have higher hydraulic conductivity, thus faster drainage.

Treatment and filtering
The abundance of tiny pores in each grain of Leca LWA make it an ideal product for particle trapping. Leca LWA can remove different types of pollutants depending on the construction of a filterbed and the choice of Leca products. This has made LWA an excellent solution for many water- and sewage treatment plants around the world.

Increased value of the outdoor area
A system made for storm water management using Leca LWA contributes greatly to water detention, infiltration and drainage. Local flood risk can also be considerably reduced. The water is stored in the open pore structure in the crushed Leca LWA, as well as in plants and growth media. A lot of the water will evaporate back into the atmosphere and this is one of the major innovative
benefits of specifying Leca LWA . The total volume of water that can be managed is dependent on the choice of solution, environmental conditions and the amount of Leca LWA used.

Well planned water management solutions can provide many additional benefits to the local area:

• green areas with biological diversity
• appealing outdoor spaces and green recreational areas
• better local aesthetics - promoting wellbeing
• efficient use of space - creating more space
• improved air quality in the surrounding area
• cooling effect in summer
Advantages with stormwater management
Efficient local management of rainwater and water run-off will provide:
• reduced risks of flooding
• removal of pollution and contaminants from flooding
• an alternative to costly and inflexible water reservoirs and drainage pipes
• a city environment customized to local municipal plans and national climate
adoption strategies

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