Here’s an interesting new tool to use when it comes to thinking about or teaching about water supply and conservation. It’s called The Pyramid of New Water Sources and comes from Jerry Yudelson , a noted green building authority and author. I just found this in a blog post from World Water Day at Jetson Green.
The Pyramid shows a progression of “new water” sources, ranging from the simple and free/cheap alternatives at the bottom to more complex and expensive at the top (with desalination and new water sources at the top). Everything below the top level is about efficiency and reuse. It’s a great reminder that when it comes to finding new supplies of water, using what we’ve already got more efficiently is almost always the most practical and cost-effective approach.