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www.lsuagcenter.com/lyn. Louisiana Yards and Neighborhoods. Reduce Stormwater Runoff. Stormwater runoff Definition Problems Solutions. Best Management Practices (BMPs) Prevent runoff Vegetative cover Alternatives Groundcovers Reduce pollutants Fertilizer Pesticides.

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reduce stormwater runoff
Stormwater runoff

Definition

Problems

Solutions

Best Management Practices (BMPs)

Prevent runoff

Vegetative cover

Alternatives

Groundcovers

Reduce pollutants

Fertilizer

Pesticides

Reduce Stormwater Runoff
hydrologic cycle
Hydrologic Cycle
  • Water on earth is constantly recycled
  • Components of water cycle:
    • Soil Infiltration
    • Evaporation
    • Transpiration - the process by which

plants release water into the atmosphere

    • Surface and channel storage
    • Groundwater storage
slide4
The soil matrix filters and somewhat detoxifies impurities from water as it travels through the ground.
slide5

Urbanization

Intensity of land use

Amount of impervious surfaces

Water quality degradation

slide6

Nonpoint source pollution Sources of pollution that cannot be pinpointed to any single cause. Usually associated with trash, car oil, chemical lawn products and other residues that are easily carried away by flowing water.

slide7
Stormwater Runoff-Rainwater that flows off yards, roads and parking lots, carrying pollutants into our waterways.
slide8

According to the EPA, polluted runoff is the #1 water quality issue in Louisiana

  • Nutrients
    • Toxins Sediments
  • Thermal Stress
      • Debris
          • Pathogens

Photo courtesy of NEMO

the problem
The Problem
  • Increased volume of surface runoff
  • Increased velocity of surface runoff
  • Concentration of pollutants in runoff

Flooding

Lowered water quality

Erosion

Sedimentation

slide11

Elevated nutrients can cause:

  • Polluted drinking water
  • Excessive aquatic plant growth
  • Lower dissolved oxygen levels
  • Fish kills
the solution
The Solution
  • Use practices or methods to prevent, reduce, retard or remove stormwater runoff contaminants before reaching receiving waters.
  • Best Management Practices (BMPs) are a series of direct recommendations based on research, evaluation and educated assumptions.
be louisiana friendly
Be Louisiana Friendly

Regardless of the type of property you own, you can help preserve Louisiana’s natural resources by:

  • Preventing runoff
  • Increasing vegetative cover
  • Reducing pollutants
prevent runoff
Prevent Runoff

Keep rain and irrigation water on your property and out of storm drains.

factors affecting stormwater runoff
Factors Affecting Stormwater Runoff:
  • Rainfall intensity, flow rate, season
  • % impervious surfaces
  • Watershed size, slope
  • Soil type,soil compaction
  • Type of vegetation
  • Density of vegetation
  • Within our control
  • Not within our control
minimize runoff by using pervious surfaces
Minimize Runoff by Using Pervious Surfaces…

for walkways, patios and driveways

direct downspouts and gutters toward porous areas
Direct Downspouts and Gutters Toward Porous Areas

If downspouts drain to planted areas, be sure to select plants adapted to periodic flooding.

collect rain water
Collect Rain Water

Use a rain barrel or a cistern to collect and store runoff for irrigation purposes.

slide21

Plan Irrigation Schedules According to the Weather

  • Water during early morning hours.
    • Plants are already wet.
    • Less evaporation losses.
  • Water less frequently in cooler months.
  • Water “as needed,” not routinely.
  • Do not irrigate if rain is expected.
earth shaping
Earth Shaping

If your property is sloped, you may want to make minor grade changes to divert runoff. This can be accomplished with terraces.

Terracing can be an attractive design element in your yard.

berms and swales
Berms and Swales

Creating swales (low areas) and berms (raised earthen areas) will help to catch, hold and filter storm water.

Elevations and depressions as small as 3-6 inches can make a huge difference.

slide24

Vegetative Cover

Planting groundcovers on slopes is an excellent way to:

  • Catch and filter storm water.
  • Slow the velocity of water movement.
  • Reduce erosion.

Turf grass is a versatile groundcover that is effective at filtering nutrients.

covering the ground with a carpet of vegetation has other advantages
Covering the Ground With a Carpet of Vegetation Has Other Advantages
  • Attractive
  • Insulates the soil
  • Acts as a living mulch that helps build up humus levels in the soil
  • Provides habitat and cover for beneficial insects and other predators

BlanketflowerGaillardia pulchella

disadvantages
Disadvantages
  • If the ground cover is too vigorous, it may require containment.
  • It can compete with other plants for water and nutrients.

Sweet potato

Ipomea batatas ‘Margarita’

The following factors should also be taken into account, when choosing the right plant for the right place…

select plants based on site conditions
Select Plants Based on Site Conditions
  • Acid, alkaline - (test your soil’s pH)
  • Dry, moist
  • Full sun, shade
  • Heat, cold
  • Salt
  • Space
  • Obstructions

Periwinkle Catharanthus roseus ‘Diva’

slide28

Alternative Groundcovers

For Shaded Areas

LilyturfLiriope muscari (USDA Zone 6-11)

Cast Iron Plant Aspidistra elatior (USDA Zone 8-11)

Periwinkle Vinca major (USDA Zone 8-11)

slide29

Alternative Groundcovers

Beach Sunflower Helianthus debilis (USDA Zone 8B-11)

Clover Trifolium repens (USDA Zone 5-11)

Perennial Peanut Arachis glabrata (USDA Zone 8-11)

slide30

Alternative Groundcovers

For Sunny Areas

Asiatic Jasmine (USDA Zone 8-11)Trachelospermum asiaticum

Junipers (USDA Zone 8-11)Juniperus spp.

slide31

Tree Canopy

Incorporate trees in the landscape

  • Intercept rainfall
  • Reduce soil compaction, thus improving water infiltration into soil
  • Increase the property value
  • Energy efficient way to cool the home
slide33

Because water can wash off our yards, it is important to reduce the amount of pollutants on our property.

  • Sweep grass and soil back onto lawns.
  • Sweep up any fertilizer on impervious surfaces.
  • Remove trash.
  • Clean up oil spills and leaks with cat litter.
  • Pick up after pets.
slide34

It is unrealistic, even unwise, to strive for an insect, disease and weed-free yard. Instead:

  • Learn to identify key pests associated with the plants in your yard.
  • Check plants regularly for signs of pest problems.
  • Determine what amount of damage warrants action.
slide35

Manage Yard Pests Responsibly

  • Avoid routine applications of pesticides.
  • Choose the least harmful method of control.
  • Treat only affected area rather than spraying the entire yard.
slide36

Fertilize Appropriately

If applied improperly, excess fertilizers can run off our yards into waterways or leach into groundwater.

  • Follow printed instructions carefully!
  • Do not apply fertilizer or pesticides before a heavy rainstorm.