storwater issues water that runs off of impervious surfaces such as roads, parking lots, or rooftops
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Storwater IssuesStorwater IssuesWater that runs off of impervious surfaces such as roads, parking lots, or rooftops.
Why manageWhy manage stormwaterstormwater??
• To prevent flooding during heavy rains.
• To keep our rivers and streams healthy.
• To meet state and federal requirements.
• To provide for future growth and development.
Dam Top and Slopes/FacesDam Top and Slopes/Faces
A dam by definition is an artificial barrier which impounds water.
Goal: Prevent Tree Growth and Erosion Ensure integrity of dam stays at highest level.
Trees located on a dam may fall creating a weak point and with a high water level, the dam could not withhold this pressure.
Dam Top and Slopes/FacesDam Top and Slopes/Faces
Prevent ErosionPrevent Erosion Stabilizing exposed soil and dirt with grass and other Stabilizing exposed soil and dirt with grass and other
vegetation that has a substantial root system and holds the vegetation that has a substantial root system and holds the soil in place.soil in place.
Principle, Emergency, and WQ Principle, Emergency, and WQ SpillwaysSpillways
Prevent stormwater from being unintentionally Prevent stormwater from being unintentionally held, instead of being released at the designed held, instead of being released at the designed controlled rate and prevent structural damage.controlled rate and prevent structural damage.
Water that is being held longer than 24-48 hours is Water that is being held longer than 24-48 hours is creating a possible safety issue.creating a possible safety issue.
Principle, Emergency, and WQ Principle, Emergency, and WQ SpillwaysSpillways
Remove any material such as sediment, leaves, Remove any material such as sediment, leaves, limbs, or anything that will restrict or stop the limbs, or anything that will restrict or stop the flow of water.flow of water.
Principle, Emergency, and Principle, Emergency, and WQ SpillwaysWQ Spillways
Remove any large debris to prevent runoff from Remove any large debris to prevent runoff from being route in alternate direction.being route in alternate direction. Used in high water elevations to discharge water out of Used in high water elevations to discharge water out of
facility and prevent structural damage.facility and prevent structural damage.
InletsInlets
Prevent stormwater from entering at an Prevent stormwater from entering at an uncontrolled rate and remove large floatable uncontrolled rate and remove large floatable debris. debris.
Runoff entering at uncontrolled rate increases the risk of erosion Runoff entering at uncontrolled rate increases the risk of erosion Removing floatable material at this point reduces the chance of Removing floatable material at this point reduces the chance of
your outlet structure from being clogged or restricting it’s flow.your outlet structure from being clogged or restricting it’s flow.
Protects young plants Protects young plants Promotes plant establishmentPromotes plant establishment Helps reduce erosionHelps reduce erosion
--Temporary and permanent blanketsTemporary and permanent blankets-All must be approved by GDOT-All must be approved by GDOT
Erosion Control Matting and
Blankets
MbProtective coverings used to establish permanent vegetation
Blankets & sod must be Blankets & sod must be anchored. anchored.
Start at top of slope and Start at top of slope and work down.work down.
Temporary DowndrainStructure
Placement
Diversion
Outlet protection and lined channel
Anchored every 10 ft
Turf Maintenance
Mowing- Remove ⅓ – ½ top growth
Fertilizer- Apply 400 lbs 10-10-10 per acre (10 lbs/1000 square feet)- In 6 – 8 weeks apply an additional 90 lbs of 34-0-0 per acre (2 lbs/ 1000 square feet) Lime- Apply 1 ton every 4 – 6 years or as per soil test
Ornamental Ornamental GrassesGrasses
River Oats (Chasmanthium latifolia)River Oats (Chasmanthium latifolia) Maiden grass (Miscanthus spp.)Maiden grass (Miscanthus spp.) Muhly grass (Muhlenbergia capillarisMuhly grass (Muhlenbergia capillaris Panic grass/Switch grass (Panicum Panic grass/Switch grass (Panicum
virgatum)virgatum) Indian grass (Sorgastrum nutans) Indian grass (Sorgastrum nutans)
OrnamentalOrnamentalGroundcoversGroundcovers
DaylilyDaylily
Asiatic jasmineAsiatic jasmine
LiriopeLiriope
Big periwinkle (Vinca major)Big periwinkle (Vinca major)
Thrift (Phlox subulata)Thrift (Phlox subulata)
IrisIris
Herbaceous OrnamentalsHerbaceous Ornamentals
- Use plants suited to wet and dry conditions- Base planting on mature plant size- Plant in fall or early spring- Fertilize in early spring- May need water during establishment
Ornamental Maintenance
Establishment-Plant in fall or early spring-Spacing depends on size of mature plant
Fertilizer-Apply 400 lbs of 10-10-10 per acre per year (10 lbs per 1000 square feet)
Lime- Apply 1 ton every 4 – 6 years or as per soil test Lime