Different Types of Rainwater Harvesting Systems The practice of harvesting rainwater is not entirely new. Ancient civilizations practiced it as a means to provide water to their crops and homes. However, it continues to be implemented today as a sustainable method for irrigation and to provide sufficient water for toilet flushing. There are many different ways to harvest water, and the method can depend on the requirements and the process. Rainwater harvesting system can be used for commercial buildings and is different from systems for homes. Here is what you need to know about every commercial rainwater harvesting system: Passive Harvesting Considered to be an ultra-green approach, passive rainwater harvesting captures and processes the rainwater naturally until it can be absorbed into the land. The term �passive� pertains to the absence of mechanical methods to collect, clean, and store the rainwater. Passive rainwater harvesting systems for commercial buildings create specific areas such as green roofs, vegetative swales, pervious concrete and wetland ponds. The goal is to retain the water and reduce the load on stormwater systems. Active Harvesting Larger commercial properties may need an active rainwater harvesting system. This is a system designed to collect, filter, store and reuse the harvested water. While this system can be more complex, it is also allows for meeting non-potable demands such as irrigation, toilet flushing or cooling tower make-up. Active harvesting also meets the goal of reducing the load on the city storm system. Combined Passive and Active Harvesting In some cases, both active and passive methods may offer the right rainwater harvesting solution for commercial buildings. When in doubt, consult with a reputable provider of rainwater harvesting systems for a comprehensive solution that maximizes water harvesting efficiency. It’s important to note that the type of rainwater harvesting system for your property will depend on factors like the amount of rainfall in your area, the square footage available to collect rainwater from parking areas and building roof. A combination of passive and active systems may be the best option depending on your unique situation and requirements.