![\"rainwater](\"https:\/\/i0.wp.com\/realgardensgrownatives.com\/wp-content\/uploads\/2015\/12\/rainwater-mit.jpg?resize=720%2C529&ssl=1\")
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It\u2019s another one of those exceptionally rainy days<\/strong> (with more to follow) and I don\u2019t want to do laundry or even take a bath. Why? A few days ago the city’s sewers overflowed into the river, and I\u2019d rather not add more water to an already overtaxed system that results in raw sewage killing and polluting the habitat of wild species downstream. It\u2019s not just the abundance of rain that\u2019s the problem: It\u2019s our infrastructure.<\/p>\n Generally, t<\/span>he unaltered earth is perfectly capable of soaking up or directing the moisture that nature doles out to natural waterways or floodplains, and seasonal flooding is normal and natural. But our urban and suburban environments, with their ubiquitous, impermeable roads, walkways, roofs, and parking lots\u2014as well as shortage of erosion-controlling plants\u2014cause runoff that carries soil and toxic pollutants like oil, fertilizers, and pesticides during heavy rains. I<\/span>n older parts of cities, pipes and tunnels that take away domestic and industrial waste combine with water collected from surface runoff. Under normal (not too wet) circumstances, the sewage and runoff is diverted to sewage treatment plants. <\/span>But when too much storm water or snowmelt can\u2019t soak in, it overwhelms the system, creating combined sewage overflows (CSOs) that cause raw sewage and other pollutants to spill into rivers, lakes, or coastal waters. People may be told not to have contact with the water, but wildlife has no choice and suffers silently. Eventually, polluted sediment builds up in waterways, increasing water temperature and turbidity and lowering oxygen levels, resulting in deaths.<\/span><\/p>\n In Portland, where I live, the city is investing in stormwater management projects<\/a> that (sort of) mimic nature, in an attempt to mitigate stormwater at its sources. There is a plethora of work going on and CSOs are reportedly decreasing in frequency, but even one is too many.<\/p>\n We can help manage and reduce stormwater pollution and overflows, starting at home. Here are some tips; some will have immediate effect, while others will take some time and effort:<\/p>\n \u25ca<\/strong> Protect existing conifer trees and plant new ones (preferably native species that historically grew in your area). A mature evergreen tree can intercept more than 4,000 gallons of rainwater each \u25ca<\/strong> Renovate or construct new walkways, driveways, and patios with permeable paving, rather than concrete or asphalt.<\/p>\n \u25ca<\/strong> Disconnect your home\u2019s downspouts when feasible and install rain gardens<\/a> or swales in landscaped areas. They help prevent flooding by allowing water that falls on your roof to slowly infiltrate into the ground, lessening the burden on sewer systems when it is most important. Simply disconnecting spouts and allowing water to run down a driveway or walkway and into the street defeats the purpose. Additional rain garden guides: here<\/a> and here<\/a>.<\/p>\n \u25ca<\/strong> Grow native plants that help control erosion. Some examples (that naturally occur in many parts of the Pacific Northwest) include vine maple (Acer circinatum<\/em>), madrone<\/a> (Arbutus menzeisii<\/em>), Oregon white oak<\/a> (Quercus garryana<\/em>), oceanspray (Holodiscus discolor<\/em>), serviceberry (Amelanchier alnifolia<\/em>), salal (Gaultheria shallon<\/em>), nootka rose (Rosa nutkana), sword fern (Polystichum <\/em> munitum)<\/em>, kinnikinnick (Arctostaphylos uva-ursi<\/em>), and inside-out flower (Vancouveria hexandra<\/em>). Choose plants that will fit your light, soil, and moisture conditions.<\/p>\n \u25ca<\/strong> Employ rain barrels to collect rainwater runoff from building roofs for irrigation during dry weather (if you can’t disconnect a downspout).<\/p>\n \u25ca<\/strong> Conserve water simply by taking very short showers, never letting the faucet run unnecessarily, and fixing any leaks (just as you would during droughts!).<\/span><\/p>\n \u25ca<\/strong> Collect <\/span>\u201cgraywater<\/a>\u201d and use it onsite to reduce sewage discharges year round. Beware: this takes some ingenuity and planning!<\/span><\/p>\nHow to help keep water clean<\/h4>\n
![\"permeable](\"https:\/\/i0.wp.com\/realgardensgrownatives.com\/wp-content\/uploads\/2015\/12\/IMG_8927-sRGB.jpg?resize=280%2C392&ssl=1\")
year, quite a bit more than deciduous trees. They also provide habitat, beauty, shade and cooling and help stabilize soil. Don’t prune out lower limbs unless it’s absolutely necessary.<\/p>\n![\"swale](\"https:\/\/i0.wp.com\/realgardensgrownatives.com\/wp-content\/uploads\/2015\/12\/swale-2.jpg?resize=320%2C448&ssl=1\")
\u25ca<\/strong> Use only organic fertilizers when necessary (excess can be washed into waterways), and don\u2019t use pesticides.<\/p>\n