{"id":406,"date":"2018-06-27T18:55:25","date_gmt":"2018-06-27T18:55:25","guid":{"rendered":"https:\/\/grgrebuildstg.wpenginepowered.com\/design\/bioretention-stormwater-control-swales-recommendations\/"},"modified":"2025-04-01T13:03:16","modified_gmt":"2025-04-01T18:03:16","slug":"bioretention-stormwater-control-swales-recommendations","status":"publish","type":"page","link":"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/bioretention-stormwater-control-swales-recommendations\/","title":{"rendered":"Bioretention &#8211; Stormwater Control Swales-  Recommendations"},"content":{"rendered":"<div id=\"mega-menu-wrap-max_mega_menu_1\" class=\"mega-menu-wrap\"><div class=\"mega-menu-toggle\"><div class=\"mega-toggle-blocks-left\"><\/div><div class=\"mega-toggle-blocks-center\"><\/div><div class=\"mega-toggle-blocks-right\"><div class='mega-toggle-block mega-menu-toggle-animated-block mega-toggle-block-0' id='mega-toggle-block-0'><button aria-label=\"Toggle 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href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/overview\/additional-design-resources\/\">Onboarding Resources<\/a><\/li><\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-align-bottom-left mega-menu-flyout mega-hide-arrow mega-menu-item-550\" id=\"mega-menu-item-550\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-550\">Trail Design Guidelines<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n<ul class=\"mega-sub-menu\" id='mega-sub-menu-550'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-551\" id=\"mega-menu-item-551\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/overarching-standards\/\">Overarching Standards<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-552\" id=\"mega-menu-item-552\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/shoulder-standards\/\">Trail Shoulder Standards<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-553\" id=\"mega-menu-item-553\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/layout-standards\/\">Layout Standards<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-566\" id=\"mega-menu-item-566\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/cross-sections\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-566\">Greenway Cross Sections<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-566'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-554\" id=\"mega-menu-item-554\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/standard-cross-section\/\">Standard Trail<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-555\" id=\"mega-menu-item-555\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/wet-flood\/\">Trail in Wet\/Flood Prone Areas<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-556\" id=\"mega-menu-item-556\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/shallow-slope\/\">Trail on Shallow Slope<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-557\" id=\"mega-menu-item-557\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/steep-slope\/\">Trail on Steep Slope<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-558\" id=\"mega-menu-item-558\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/roadway\/\">Trail by Roadway<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-559\" id=\"mega-menu-item-559\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/urban\/\">Trail in Urban Context<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-560\" id=\"mega-menu-item-560\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/boardwalk\/\">Boardwalk Trail<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-561\" id=\"mega-menu-item-561\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/underpass\/\">Trail at Bridge Underpass<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-562\" id=\"mega-menu-item-562\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/railway\/\">Trail Adjacent to Railway<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-563\" id=\"mega-menu-item-563\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/standard-cross-section-secondary-path\/\">Secondary Path<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-567\" id=\"mega-menu-item-567\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/neighborhood\/\">Trail through Neighborhood<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-564\" id=\"mega-menu-item-564\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/stream\/\">Trail Adjacent to Stream<\/a><\/li>\t<\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-568\" id=\"mega-menu-item-568\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/intersections-and-crossings\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-568\">Intersections and Crossings<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-568'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-570\" id=\"mega-menu-item-570\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/major-intersection\/\">Major Intersection with Bike Lane<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-569\" id=\"mega-menu-item-569\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/greenway-major-intersection-turn-recommended-layout\/\">Major Intersection with Turn<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-571\" id=\"mega-menu-item-571\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/mid-block\/\">Major Street Mid-Block<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-578\" id=\"mega-menu-item-578\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/minor-mid-block\/\">Minor Street Mid-Block<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-577\" id=\"mega-menu-item-577\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/minor-mid-block-parking\/\">Minor Street Mid-Block with Parking<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-579\" id=\"mega-menu-item-579\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/mid-block-crossing-angled-pedestrian-refuge\/\">Mid-Block Crossing - Angled Pedestrian Refuge<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-580\" id=\"mega-menu-item-580\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/minor-street-t\/\">Minor Street T-Intersection<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-582\" id=\"mega-menu-item-582\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/major-trail\/\">Major Trail Connection<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-581\" id=\"mega-menu-item-581\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/minor-trail-connection-standard-layout\/\">Minor Trail Connection<\/a><\/li>\t<\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-734\" id=\"mega-menu-item-734\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/trail-nodes\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-734\">Trail Nodes<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-734'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-733\" id=\"mega-menu-item-733\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/major-trailhead-recommended-layout\/\">Major Trailhead - Recommended Layout<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-735\" id=\"mega-menu-item-735\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/minor-trailhead\/\">Minor Trailhead - Recommended Layout<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-737\" id=\"mega-menu-item-737\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/gateways\/\">Gateway - Recommended Layout<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-736\" id=\"mega-menu-item-736\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/greenway-intersection\/\">Major Greenway Intersection - Recommended Layout<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-739\" id=\"mega-menu-item-739\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/seating-node\/\">Large Seating Node - Recommended Layout<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-738\" id=\"mega-menu-item-738\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/small-seating-nodes\/\">Small Seating Node - Recommended Layout<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-740\" id=\"mega-menu-item-740\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/bicycle-parking\/\">Bicycle Parking - Recommended Layout<\/a><\/li>\t<\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-746\" id=\"mega-menu-item-746\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/surfacing\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-746\">Surfacing<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-746'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-742\" id=\"mega-menu-item-742\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/surfacing-primary-trail\/\">Surfacing Standards - Primary Trail<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-741\" id=\"mega-menu-item-741\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/surfacing-secondary-path\/\">Surfacing Standards - Secondary Path<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-744\" id=\"mega-menu-item-744\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/surfacing-standards-roadway-service-drives\/\">Surfacing Standards - Roadway \/ Service Drives<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-745\" id=\"mega-menu-item-745\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/specialty-pavements\/\">Surfacing Basis of Design - Specialty Pavements<\/a><\/li>\t<\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-747\" id=\"mega-menu-item-747\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/trail-structures-furnishings\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-747\">Trail Structures & Furnishings<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-747'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-748\" id=\"mega-menu-item-748\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/masonry-walls-seat-walls-retaining-walls-recommendations\/\">Masonry Walls, Seat Walls, Retaining Walls - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-749\" id=\"mega-menu-item-749\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/modular-concrete-masonry-unit-walls-recommendations\/\">Modular and Concrete Masonry Unit Walls - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-750\" id=\"mega-menu-item-750\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/concrete-stem-wall-recommendations\/\">Concrete Stem Wall - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-751\" id=\"mega-menu-item-751\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/boulder-ledge-rock-walls\/\">Boulder \/ Ledge Rock Wall - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-752\" id=\"mega-menu-item-752\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/bridges-landings\/\">Bridges & Landings<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-753\" id=\"mega-menu-item-753\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/bridge-abutment-standards\/\">Bridge Abutment - Standards<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-754\" id=\"mega-menu-item-754\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/shelters-pavilions\/\">Shelters \/ Pavilions - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-755\" id=\"mega-menu-item-755\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/handrails-basis-design\/\">Handrails - Basis of Design<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-756\" id=\"mega-menu-item-756\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/fencing\/\">Fencing - Basis of Design<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-757\" id=\"mega-menu-item-757\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/contemporary-furnishings\/\">Contemporary Furnishings - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-758\" id=\"mega-menu-item-758\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/historic-furnishings\/\">Historic Furnishings - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-759\" id=\"mega-menu-item-759\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/transitional-furnishings\/\">Transitional Furnishings - Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-760\" id=\"mega-menu-item-760\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/trail-design\/drinking-fountain-install\/\">Drinking Fountain - Installation Detail<\/a><\/li>\t<\/ul>\n<\/li><\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-align-bottom-left mega-menu-flyout mega-hide-arrow mega-menu-item-573\" id=\"mega-menu-item-573\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-573\">Environmental Design Guidlines<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n<ul class=\"mega-sub-menu\" id='mega-sub-menu-573'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-761\" id=\"mega-menu-item-761\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/stormwater-grading-considerations\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-761\">Stormwater and Grading Considerations<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-761'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-762\" id=\"mega-menu-item-762\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/stormwater-bmp-selection-recommendations\/\">Stormwater BMP Selection Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-763\" id=\"mega-menu-item-763\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/bioretention-raingarden\/\">Bioretention \u2013 Rain Garden \u2013 Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-764\" id=\"mega-menu-item-764\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/standard-cross-section-trail-bmp\/\">Standard Cross Section - Trail with BMP<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-765\" id=\"mega-menu-item-765\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/permeable-pavement\/\">Permeable Pavement- Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-766\" id=\"mega-menu-item-766\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/amended-soils-disconnection-recommendations\/\">Amended Soils Disconnection- Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-767\" id=\"mega-menu-item-767\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/ponds-wetlands\/\">Stormwater Ponds and Wetlands- recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-768\" id=\"mega-menu-item-768\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/bioretention-stormwater-control-swales-recommendations\/\">Bioretention \u2013 Stormwater Control Swales-  Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-769\" id=\"mega-menu-item-769\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/temporary-bank-stabilization-strategies\/\">Temporary Bank Stabilization Strategies<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-770\" id=\"mega-menu-item-770\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/permanent-bank-stabilization\/\">Permanent Bank Stabilization Recommendations<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-771\" id=\"mega-menu-item-771\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/stream-stabilization-techniques\/\">In-Stream Stabilization Techniques<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-772\" id=\"mega-menu-item-772\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/culverts-piping-standards\/\">Culverts and Piping \u2013 Standards<\/a><\/li>\t<\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-773\" id=\"mega-menu-item-773\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/trail-planting-guidelines\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-773\">Trail Planting Guidelines<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-773'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-790\" id=\"mega-menu-item-790\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/planting-vision-goals\/\">Planting Vision & Goals<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-791\" id=\"mega-menu-item-791\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/planting-anatomy\/\">Planting Anatomy<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-792\" id=\"mega-menu-item-792\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/recommended-matrix-planting-strategies\/\">Recommended Matrix of Planting Strategies<\/a><\/li>\t<\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-775\" id=\"mega-menu-item-775\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/typical-planting-design\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-775\">Typical Planting Design<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-775'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-776\" id=\"mega-menu-item-776\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/soil-preparation\/\">Soil Preparation<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-777\" id=\"mega-menu-item-777\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/standard-turf-shoulder\/\">Standard Turf Shoulder<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-778\" id=\"mega-menu-item-778\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/recommendations-turf-lawn-high-mow-lawn\/\">Recommendations for Turf Lawn \/ High Mow Lawn<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-779\" id=\"mega-menu-item-779\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/native-grassland-planting\/\">Recommendations for Native Grassland Planting<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-780\" id=\"mega-menu-item-780\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/recommendations-native-shrub-perennial-beds\/\">Recommendations for Native Shrub and Perennial Beds<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-781\" id=\"mega-menu-item-781\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/recommendations-woodland-forest-planting\/\">Recommendations for Woodland \/ Forest Planting<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-782\" id=\"mega-menu-item-782\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/streambank-planting\/\">Recommendations for Streambank Planting<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-783\" id=\"mega-menu-item-783\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/wetland-pond-edge-planting\/\">Recommendations for Wetland \/ Pond Edge Planning<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-784\" id=\"mega-menu-item-784\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/bioretention-rain-garden\/\">Recommendations for Bioretention \/ Rain Garden<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-menu-item-785\" id=\"mega-menu-item-785\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/tree-planting\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-785\">Standards for Tree Planting<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n\t\t<ul class=\"mega-sub-menu\" id='mega-sub-menu-785'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-786\" id=\"mega-menu-item-786\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/standards-tree-planting-root-barriers\/\">Root Barriers<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-787\" id=\"mega-menu-item-787\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/standards-tree-planting-soil-volume-tree-health\/\">Soil Volume for Tree Health<\/a><\/li>\t\t<\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-788\" id=\"mega-menu-item-788\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/tree-staking\/\">Standards for Tree Staking<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-789\" id=\"mega-menu-item-789\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/shrubs-ornamental-grasses-perennials\/\">Shrubs, Ornamental Grasses, & Perennials<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-793\" id=\"mega-menu-item-793\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/environmental\/bed-edges\/\">Recommendations for Bed Edges<\/a><\/li>\t<\/ul>\n<\/li><\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-has-children mega-align-bottom-left mega-menu-flyout mega-hide-arrow mega-menu-item-574\" id=\"mega-menu-item-574\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/construction\/\" aria-expanded=\"false\" aria-controls=\"mega-sub-menu-574\">Pre-Construction & Construction<span class=\"mega-indicator\" aria-hidden=\"true\"><\/span><\/a>\n<ul class=\"mega-sub-menu\" id='mega-sub-menu-574'>\n<li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-799\" id=\"mega-menu-item-799\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/required-front-end-drawings-addition-design-drawings\/\">Required Front End Drawings (In Addition to Design Drawings)<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-795\" id=\"mega-menu-item-795\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/construction\/erosion-control-stormwater-pollution-prevention-plan-swppp\/\">Erosion control and stormwater pollution prevention plan (SWPPP)<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-796\" id=\"mega-menu-item-796\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/construction\/testing-quality-assurance\/\">During Construction \u2013 Testing & Quality Assurance<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-797\" id=\"mega-menu-item-797\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/construction\/construction-mock-ups\/\">During Construction \u2013 Mockups<\/a><\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-menu-item-798\" id=\"mega-menu-item-798\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/construction\/construction-checkpoints\/\">During Construction \u2013 Checkpoints<\/a><\/li><\/ul>\n<\/li><li class=\"mega-menu-item mega-menu-item-type-post_type mega-menu-item-object-page mega-align-bottom-left mega-menu-flyout mega-menu-item-587\" id=\"mega-menu-item-587\"><a class=\"mega-menu-link\" href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/overview\/additional-design-resources\/\">Onboarding Resources<\/a><\/li><\/ul><\/div>\n<h4><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-7593\" src=\"https:\/\/greatriversgreenway.org\/design\/wp-content\/uploads\/sites\/2\/2024\/05\/swales1.png\" alt=\"\" width=\"452\" height=\"425\" \/>Swales are used to capture sheet flow from a parking lot or trail surface and in most places where a ditch is traditionally used.<\/h4>\n<p>One of the three swale types described below are recommended as trailside drainage in place of a simple ditch for linear stormwater controls as needed adjacent to the trail. Swales can be placed adjacent to and hydraulically connected to permeable pavers where they can act as an inlet to the storage beneath surface pavers and act as a redundant connection to the gravel storage if the pavers become clogged. The three types of swales are: dry vegetated swales, wetland swales, and grass swales.<\/p>\n<p><strong>Design Metrics:<\/strong><\/p>\n<ul>\n<li>Sized to convey the largest\/average 24-hour, 10- to 15-year storm or other level of service specified by local stormwater control guidelines.<\/li>\n<li>Trailside drainage swales are to be designed such that no stormwater runoff sheet flow from the surrounding area flows over the surface of the trail.<\/li>\n<li>Longitudinal slopes for all swales are to be between 1% and 6% (less than 5% for grass swales).<\/li>\n<li>Side slopes for dry swales and wetland swales are to be between 3:1 and 5:1. Side slopes for grass swales can be flatter than 5:1.<\/li>\n<li>Channel bottoms for wetland swales are 2- to 8-feet wide. Channel bottoms for dry swales or grass swales are typically less than 8-feet, but can be larger if needed.<\/li>\n<li>Check dams are appropriate for all trailside drainage swales to provide limited detention storage, develop a milder slope, and\/or develop a slower flow rate. Check dams shall be made of aggregate or rip rap.<\/li>\n<li>Freeboard is to be 6-inches minimum.<\/li>\n<li>Rip rap is only to be used as a check dam material or in localized areas where required for erosion control. No drainage swales are to be lined with rip rap.<\/li>\n<li>Grass swales may require turf reinforcement mats or erosion control blankets. See <a href=\"https:\/\/greatriversgreenway.org\/design\/design-guidelines\/construction\/erosion-control-stormwater-pollution-prevention-plan-swppp\/\" target=\"_blank\">EROSION CONTROL AND STORMWATER POLLUTION PREVENTION PLAN (SWPPP)<\/a> section (link).<\/li>\n<\/ul>\n<hr \/>\n<h4><img loading=\"lazy\" decoding=\"async\" class=\"white-border alignright wp-image-7592 \" src=\"https:\/\/greatriversgreenway.org\/design\/wp-content\/uploads\/sites\/2\/2024\/05\/swales2.png\" alt=\"\" width=\"451\" height=\"270\" \/>Dry Swales &#8211; PREFERRED MATERIAL<\/h4>\n<p>Dry Swales are broad shallow channels with vegetation covering the side slopes and channel bottom. They include an engineered soil mix, graded filter, and underdrain system. They are planted with dense, low growing native vegetation that can withstand periods of inundation and drought. Vegetation should be salt tolerant where salt is to be used for de-icing. Dry swales are linear bioretention cells and are considered green infrastructure.<\/p>\n<p><strong>BEST USE AREAS:\u00a0<\/strong><br \/>\nDry swales are particularly applicable in natural depressions adjacent to trails, parking lots and adjacent to permeable pavers.<\/p>\n<p><strong>PROS: <\/strong><br \/>\nDry swales and wetland swales provide volume reduction, water quality treatment, channel protection storage and Peak Flood Detention Storage; aesthetics<\/p>\n<p><strong>CONS: <\/strong><br \/>\nRequires regular maintenance.<\/p>\n<hr \/>\n<h4><img loading=\"lazy\" decoding=\"async\" class=\"white-border alignright wp-image-7591 \" src=\"https:\/\/greatriversgreenway.org\/design\/wp-content\/uploads\/sites\/2\/2024\/05\/swales3.png\" alt=\"\" width=\"450\" height=\"263\" \/>WETLAND SWALES &#8211; PREFERRED FOR HIGH WATER TABLE AREAS<\/h4>\n<p>Wetland Swales are broad shallow channels with native vegetation covering the side slopes and emergent vegetation covering the channel bottom. They have no filter bed or underdrain. They are planted with dense, low-growing native vegetation that can withstand periods of inundation and drought and where soils have a high salt content.<\/p>\n<p><strong>BEST USE AREAS: <\/strong><br \/>\nWetland swales are well suited to linear applications where the water table is high or stormwater tends to collect for extended periods of time.<\/p>\n<p><strong>PROS: <\/strong><br \/>\nDry swales and wetland swales provide volume reduction, water quality treatment, channel protection storage and Peak Flood Detention Storage; aesthetics.<\/p>\n<p><strong>CONS: <\/strong><br \/>\nRequires regular maintenance.<\/p>\n<hr \/>\n<h4><img loading=\"lazy\" decoding=\"async\" class=\"white-border alignright wp-image-7590 \" src=\"https:\/\/greatriversgreenway.org\/design\/wp-content\/uploads\/sites\/2\/2024\/05\/swales4.png\" alt=\"\" width=\"450\" height=\"284\" \/>GRASS SWALES<\/h4>\n<p>Grass Swales are grass lined channels with no special provisions to maximize infiltration or reduce pollution such as those for dry swales or wetland swales. It is recommended that the plantings in grass swales be native or adaptive grasses that can provide a root depth of up to 15 feet and be allowed to grow to full height (not mowed) to improve infiltration and provide some water quality benefit.<\/p>\n<p><strong>BEST USE: <\/strong><br \/>\nWhere concentrated runoff is expected to cause erosion damage. Isolated portions of the trail where access for maintenance may be limited or difficult.<\/p>\n<p><strong>PROS: <\/strong><br \/>\nLess frequent maintenance required.<\/p>\n<p><strong>CONS: <\/strong><br \/>\nDoesn\u2019t provide water quality and volume benefits like dry or wetland swales.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Swales are used to capture sheet flow from a parking lot or trail surface and in most places where a&#8230;<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":82,"menu_order":8,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-406","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/pages\/406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/comments?post=406"}],"version-history":[{"count":0,"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/pages\/406\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/pages\/82"}],"wp:attachment":[{"href":"https:\/\/greatriversgreenway.org\/design\/wp-json\/wp\/v2\/media?parent=406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}