A Glossary of Rainwater and Greywater Recycling Terms

There are many, many options for harvesting rainwater–and we can help you with all of them!

If you’re new to the concept of rainwater harvesting or greywater recycling, all the terminology might be a tad overwhelming. Here are the definitions of some of the most commonly-used terms you’ll find on our website. 

What exactly is Rainwater Harvesting? And what do the terms “Greywater” and “Blackwater” mean?

Rainwater Harvesting (passive and active)—the simplest form of collecting and storing rainwater. Passive harvesting stores the rainwater on the site where it falls, and is infiltrated into the ground for landscaping. Active rainwater harvesting occurs when the rainwater is stored for later use.

Greywater—this is the water you use in your bathroom sinks, shower, and laundry room. It can be treated and recycled to use in various applications, such as irrigation or car washing.

Blackwater—water specifically from the kitchen sink and bathroom toilets.

Potable—water that has been deemed safe for drinking. If rainwater has been collected, treated and sanitized, it may be suitable to drink.

I want to use rainwater or greywater on my lawn, in my vegetable garden and to wash my car.

Irrigation Systems—many rainwater harvesting applications direct the water to irrigation systems, which provide water for landscapes and growing plants. Because of its beneficial microorganisms and balanced pH, rainwater is a sustainable way to grow a healthy landscape.

Drip Irrigation System—A watering process where water drips through small openings in tubes. Since the water flow is adjustable, it reduces the amount of water lost to evaporation.

Branched drain Greywater System—a greywater system that moves water from the main drain line and separates it into several different drain lines. It can water multiple areas at once.

Xeriscaping—a type of landscaping that incorporates water-conserving techniques and plants.

What are the components of a rainwater harvesting system?

Catchment surface—the method or appliance used to collect rainwater—usually a house’s roof.

Downspout—a drainage device attached to the gutters. They direct water away from the house to the cistern or a beneficial location in the landscape.

First-flush diverter—a screen or filter that clears the water of debris as it flows through the pipe. It can be as simple as a gutter screen.

Cistern—a receptacle for holding and storing rainwater.

Purification filter—treats the water and removes contaminants so that is safe to use.

Distribution System—a device that uses gravity or a pump to move water through the irrigation system or whatever purposes the owner desires.

Have we clarified some of these terms for you? If you’d like to learn more, visit the “Resources” page on our website, then contact us when you’re ready to talk to our experts about the best options in rainwater or greywater harvesting and recycling for your home, business, or facility.