This website, created by the Oregon Environmental Council, is designed to educate people about the impacts that development can have on local watersheds. It illustrates the impact that even a small, one family home can have on a local ecosystem. The construction of a single family home can create impervious surfaces on anywhere from 25 to 60% of the property. The amount of impervious surface needed to cause a significant amount of damage to an ecosystem is often less than 10%. This figure is only for a single family home. When we talk about the impact of urban developments that can have close to 100% impervious surface cover the damage to the ecosystem is unavoidable. It is important to realize the widespread effects that development can have on local watersheds and the surrounding ecosystems. Take a look at this website to look at some of the other ways that ecosystems can be damaged by urban development.