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.

Problems

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 WQ Principle, Emergency, and WQ SpillwaysSpillways

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.

InletsInlets

Positrack skid Positrack skid steer with steer with mulching mulching

cutter headcutter head

4x4 Tractor 4x4 Tractor on slopeon slope

Chipper Crew Chipper Crew with Loaderwith Loader

Recently cut Recently cut pondpond

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 must be applied Blankets must be applied correctlycorrectly

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