drainage

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Information about drainage
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Published on December 6, 2007

Author: Beverly_Hunk

Source: authorstream.com

Drainage Options :  Drainage Options Information For Homeowners Drainage Options:  Drainage Options Horticultural ways to help wet soils Slowing/intercepting Runoff Slope/grading possibilities Underground/subsurface alternatives Drainage Options:  Drainage Options Horticultural Improvements Soil Plants Mulch Drainage Options:  Drainage Options Soils Add compost – organic matter Encourage earthworms/microorganisms Aerate lawns Avoid compaction Drainage Options:  Drainage Options Plant Selection “Wet Feet” Erosion control – groundcovers on slopes Native plants Plant lists: - Extension Publications: Trees for Problem Landscape Sites: www.ext.vt.edu - Native plants for Conservation, Restoration and Landscaping (comprehensive list): www.dcr.state.va.us/dnh/native.htm Native Plants:  Native Plants Group several of the same plant together to establish a healthy population. Plants for Wet Sites:  Plants for Wet Sites Plants Royal fern, maidenhair fern, ostrich fern Cardinal flower Foam flower Bleeding heart Soloman’s seal Butterfly weed Columbine (native variety: Aquilegia canadensis) Heavy metal switch grass Plants:  Plants Shrubs Sweet pepperbush (Clethra alnifolia) Red twig dogwood Bush blueberry (Vaccinium corymbosum) Inkberry holly (Ilex glabra) Winterberry holly (Ilex vertilulata) Arrowwood Viburnum (Viburnum dentatum) Sweetspire (Itea virginica) Red Chokeberry (Aronia abutifolia) Plants:  Plants Trees River Birch (Betula nigra) American Hornbeam (Carpinus carolinia) American Holly (Ilex opaca) Sweetbay Magnolia (Magnolia virginiana) Tupelo (Nyssa sylvatica) Swamp White Oak (Quercus bicolor) Pussy Willow (Salix discolor) Bald Cypress (Taxodium distichum) Drainage Options:  Drainage Options Mulch Organic – bark, shredded or “nuggets” Depth of 2-4 inches Advantages Breaks raindrops/prevents erosion Aesthetic Weed control No volcanoes! Drainage Options:  Drainage Options Slow Runoff Gutters/downspouts, splashblocks/extenders Rain Barrel/cistern Rain garden Drainage Options:  Drainage Options Gutters/downspouts Leaf guard to prevent stoppages Repair leaks Check slope Drainage Options:  Drainage Options Splashblocks/ extenders Slope AWAY from foundation Extend downspout: roll-out, perforated extension (above ground or buried); solid pipe Drop inlet Drainage Options:  Drainage Options Rain Barrels & Cisterns – above or under- ground Drainage Options:  Drainage Options Rain Gardens: Shallow landscaped areas built to slow down and hold rain runoff, allowing it to soak into the ground, instead of flowing into storm drains. Rain Gardens: Commercial Use:  Rain Gardens: Commercial Use Parking Lots Neighborhood Common Areas, Parks, Schools New Commercial Developments (LID) Drainage Options:  Drainage Options Rain Garden Advantages Prevent Erosion Help prevent local (yard) flooding. Soak up to 30% more water than lawns. Prevent pollution Where to Build a Rain Garden:  Where to Build a Rain Garden Between area to be drained (roof, driveway or yard) and storm drain or street Where downspout or other area can drain to it across a grassy area, or “filter strip” At least 10 feet from your house’s foundation An oval or oblong shape approximately 5-7% of the size of the area draining to it (roof, etc.) Testing Drainage:  Testing Drainage Dig test hole One foot deep One foot long/wide Fill with water until saturated Fill again to top and let stand If doesn’t drain in 24 hours, the site is not suitable for Rain Garden Building Rain Gardens:  Building Rain Gardens Call Miss Utility!!! Remove grass and 3-6+ inches of soil to make a level bottom. Mix in compost, sand, topsoil, and other soil conditioners for better drainage. Rain Gardens:  Rain Gardens Drainage Options:  Drainage Options Slope/re-grading possibilities To slow and/or redirect flow of runoff But BEWARE: Don’t create more problems for yourself or your neighbors Drainage Options:  Drainage Options Slope/grading possibilities Filling low spots Terracing slopes Swales and serms Dry creek beds Drainage Options:  Drainage Options Filling low spots If adding soil to low areas – be sure water has somewhere to go Incorporate the new soil Drainage Options:  Drainage Options Terracing Slopes Prevents runoff erosion of slopes Makes better planting beds – level, more stable Building Terraces:  Building Terraces Height Materials Reinforcement Plants Mulch Drainage Options:  Drainage Options Berms Earthen mounds used to direct drainage (among other uses) A site designer should evaluate the entire site’s drainage before considering a berm of significant size. Drainage Options:  Drainage Options Swales: Shallow earthen channels covered with grass Building A Dry Creek Bed:  Building A Dry Creek Bed Mimic stream’s shape – meander? At least twice as wide as deep (good size is three feet wide by 18 inches deep) Add rocks/plants Lead to dispersal area or pond (NOT street) Drainage Options:  Drainage Options Underground/subsurface alternatives Hire Assistance for underground drainage options to ensure proper diversion and dispersal of water: French Drain Underground drainage system Drainage Options:  Drainage Options French Drain Gravel-filled trench Perforated pipe Covered with fabric Slope to aid drainage Call Miss Utility FIRST Drainage Options:  Drainage Options Underground Drainage System Hire a professional contractor qualified to create drainage systems. Questions?:  Questions?

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