Flora said, "I think the best we can do with small gardens, is to create balanced ecosystems.
Markus said, "Are there ressources that could help?
Flooding is not the only issue. If you have small streams in your area, the more "hard scape" as the planners call it, the faster the water runs off, then there's no water hanging around in soil, mulch and plants to feed the streams when the rain stops for weeks or months. This is a major problem in my area. They're trying to rehabilitate the streams to support the wild salmon fishery, but every new patch of roof or pavement and to some extent the typical, non-permie version of "lawn", is less water storage in the soil. So if you need a little garden shed or carport, consider a green roof with a polyculture of plants. If you need a driveway, consider gravel with a grass area between the tire tracks. Research "rain gardens" that are specifically designed to slow and infiltrate rain water, rather than encouraging it to run off as quickly as possible to the storm drains. Yes - plan for a proper and safe "overflow" feature for really big storms, but see how much you can capture before it starts to run away!
Tereza Okava wrote:as an urban gardener (on a much smaller plot, even) I would like to add: rainwater catchment. Flooding is a major problem, and keeping vegetation and not paving over yards represents an important way of controlling storm runoff. Trees and gardens, in yards as well as even on roofs, can help absorb excess water.