Green Visions: turning alleys into allies
Prior to 2013, three million gallons of storm water runoff was pouring into Lake Nokomis in south Minneapolis every year, along with over two tons of soil-suspended solids and more than 15 pounds of phosphorus.
Metro Blooms is a non-profit organization in the Twin Cities, encouraging gardeners to become active stewards of local water resources, and with a few small fixes and a neighborhood working together, they've made a huge difference in the lake's water quality - and the community's sense of pride and ownership.
You can read more about the Lake Nokomis Alley Project here.
Here is more information on storm water runoff on a city alley, using both nonpermeable and permeable surfaces.
Metro Blooms has information for folks who might want to start similar projects in their own communities. This is their contact page.