Forgotten Rain 
The next step: Cascade Water Cycling


Forgotten Rain Website

We are a website focused on helping all levels of experience related to rainwater catchment and reuse. We provide current innovations and traditional proven information. We have provided links for further investigation as well as white pages for gaining a basic understanding of various elements of water catchment and reuse. We also offer design services if you do not want to attempt some project on your own.  If we cannot help you, we will put you in touch with a rainwater harvesting expert closer to your location.    

We are currently rebuilding our website and are in the process of uploading all the information we have. If you do not see what you are looking for or can see it will be uploaded soon, let us know and we will work to get you what you are looking for in an expedited manner.  Be sure to sign our guestbook so we can send you a notice when we have made updates on the site.  Thank you.

Rainwater Catchment and Reuse

Forgotten Rain, Rediscovering  Rainwater Harvesting was the name of our first book and Forgotten Rain became the name of our first company.  Our second book, Design for Water, is closer to our current passion in water catchment and reuse. Both of these books are available in our library. We have been working with low impact development techniques for over 27 years, producing educational material and practicing rainwater harvesting catchment design for over 10 years, and plan to continue with an expanded vision for all types of water catchment and reuse in future years. Our focus is on a process we call cascade water cycling and how we can use this process to increase effiencies in all systems dealing with water. We call this technique hydrocharging.


Cascade Water Cycling

This is a process of taking a water supply using it one time for the highest quality it allows and reusing it for the next possible water quality use then reusing it a third or fourth time before cleaning and releasing it back into the environment. Each time the water is used it cascades down to the next water quality use.  An example would be catching rainwater for use as cooling tower makeup water, using the cooling tower blow down to flush toilets, then treating the blackwater and using it for landscape irrigation. One water source is used multiple times instead of using treated potable water one time.


This process includes using water, captured and reused water, to make one action more efficient while accomplishing a second action.  A simple example of this process would be using captured rainwater for landscape irrigation through low impact development (LID) techniques – irrigating the vegetation and infiltrating excess water. This example enhances a natural process without using potable water.  A more complex example would be using a macro rainwater harvesting process to stop pollution migration, irrigate vegetation, and cool dry soils for a ground source heat pump geofield. This example infiltrates water while making the geofield more efficient by drawing the heat away from the pipes.

Code Changes

There are multiple codes to be aware of when designing a rainwater system including local and national, but two codes that have been revised to include rainwater systems are the International Green Construction Code that can be downloaded at 
and the 2010 Green Plumbing Code that can be purchased at 
Both of these codes have valuable information for potable and non potable rainwater systems.

The American Rainwater Catchment Systems Association (ARCSA) has document titled Rainwater Catchment Design and Installation Standards that can assist with commissioning of a rainwater system. This document can be found on the ARCSA website at

Additional Assistance

If you would like further information please do not hesitate to contact us to assist in designing a rainwater catchment system, designing a ground source heat pump system, US Green Building LEED assistance, research needs, or finding a rainwater consultant in your area.

Heather Kinkade, FASLA, LEED-AP, ARCSA-AP

Phoenix, AZ



Please also visit our artistic side of life:
Kinkade Gourds, Fine Art Gourds by Heather Kinkade

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