This report profiles a framework for assessing the business case for natural infrastructure investment and a due diligence process for the implementation of natural infrastructure projects. More specifically, the report provides an overview of approaches to assess the economic value of natural infrastructure investments, versus traditional built infrastructure solutions. This expands the utility of the framework beyond local communities and makes it relevant to parties seeking to direct green infrastructure spending in Canada. The key message is that Canada cannot afford to lose more natural infrastructure assets, like wetlands and ponds, in its overall effort to limit the growing costs of floods, droughts and other natural disasters.