Home Owners Association - Shoreline Stabilization to protect HOA real estate asset.

1. Sunset Ridge’s Homeowners Association Guide To Erosion Control

2. Is your house getting closer to the lake each year as your shoreline erodes?

7. Several factors contribute to this type of erosion Terrestrial Forces-slumping, sliding, soil creep, frost action, and wind action Aquatic Forces-raindrop splash, sheet erosion, rilling, gullying, wave action, long shore drift, and ice push Human Activities-clear-cutting of forests and shorelines, increasing and concentrating stormwater runoff, agriculture, urbanization, and construction

8. First, step back, and determine the cause and extent of shoreline erosion at your lake Sunset Ridge’s Primary Erosion Sources Wave Action Ice Flow

9. Methods of Erosion Control The three types of standard erosion control are Vegetative Structural Combination of Vegetative and Structural None of these methods is right for all situations. It is important to match the type of erosion, and lakeshore environment to the control.

10. Vegetative erosion control is the use of native plants to stabilize the soil near the shore Vegetative – Advantages Increased spawning ground for fish Adequately disperses wave action Soil and fertilizers are filtered through buffer strip, so less ends up in the lake. Ducks favor this type of habitat – less food source for geese. Vegetative – Disadvantages Increases chance encounter with water snakes, ticks. Does not provide “neat” shoreline view with park-like grass. Difficult to establish, high mortality of plants Requires monthly maintenance for first three years Not Permanent – can fail

11. Structural erosion control involves building either a sea wall or the placement of rock riprap. Riprap – Advantages Provides some structure for smaller fish/crayfish species. May prevent further erosion of site, if correctly installed. May provide immediate erosion control – reduced wave action Permanent –under normal circumstances will last 7-10 years. Riprap– Disadvantages Riprap protects only the land immediately behind the barrier, and not the adjacent areas. In fact, erosion may increase by wave reflection from the structure. Riprap does not reduce water temperature, or filter soil from the land above the lake. Riprap does not maintain natural look of the lake. Lakes with a riprap shore are less likely to have ducks or geese – waterfowl like to be able to walk out of water. Requires 404 permit from Corps of engineers / 401 permit from DNR.

12. Combination of shoreline erosion control uses both of the previous methods. Combination– Advantages Immediate erosion control, with future benefits of vegetation. Combination– Disadvantages Most expensive, since you have to do both riprap and plantings.

13. Recommendations for Sunset Ridge Proposal One: Rip Rap would be installed along 792 lf of shoreline, leaving the beach area as is. The application of rip rap would extend 7’ in width and be approximately 18” deep. The detention pond is filled with invasive cattails. FRE would herbicide the species and install 3500 native plugs. We are hoping the Army Corp. will accept this as the “native development” component eliminating native plantings along the shoreline and providing the HOA a manicured appearance and interesting plant species in the detention pond.

14. Mobilization/Construction Sequencing Discovery and Cleaning of detention pond outlet Plant 3500 plugs in detention pond Key-in and install GTX 160 filtration fabric to protect existing soils from further erosion Install Rip Rap 8-18” Landscape restoration

15. Native Plantings/Plugs

16. Native Plugs

17. Recommendations for Sunset Ridge Proposal Two: Stabilization using outcroppings, rip rap and native development of detention pond. In addition to the rip rap installation described above; 7 locations would have 20’ long runs of Rosetta Stone outcroppings installed. The outcroppings would be two tiers high (15”).

18. Rosetta Stone

19. Rosetta Stone Installed

20. St. Mary’s

21. Elysian HOA

22. Natural Colored Rip Rap

23. Spring 2010 Sunset Ridge showcases a new protective and aesthetically pleasing shoreline. Timeline from Army Corp Permitting to Authority Approval 7 months.