Discover WatertownHow Do I

Go To Search
Click to Home
PrintEmailRSSTwitter

Shoreline
Shoreline Stabilization
Stabilization protects shoreline from erosion.

How does erosion occur?
1. Excessive water, wind, or lack of protection exists.
2. Soil becomes saturated and fluid.
3. Wave action pulls suspended solids from the shoreline to lower levels.
4. As new soil is exposed, the process continues.
5. Areas where the water undercuts the shoreline erode faster.

lake shoreline erosion drawing

When does shoreline erosion stop naturally?
When the slope of the shoreline achieves an 8:1 or 10:1 (horizontal vs. vertical) ratio, very little erosion will occur no matter what the protective surface.

shoreline erosion stops


Types of Shoreline Protection
Stabilization can be done in different ways. For more technical assistance, call 605-882-5250 or email

Rock Riprap generally is the least expensive and easiest to repair and maintain. Rock riprap components consist of: the angle and length of the slope, the toe, the filter fabric, and the rock. A 3:1 or flatter back slope minimizes the force of the waves; the toe prevents water from undermining the protected area and protects the structure from damage from ice heaves and wind-driven ice sheets; a minimum of 6-8 oz. of Geotextile fabric is the protection barrier. All the other components of the design are to keep the fabric in place to do the work. The rock holds the fabric in place and prevents damage.

                                rock shoreline protection drawing   rock protecting shore from erosion


Seawalls (abutments / bulkheads) of steel or concrete
Bulkheads are driven into the shoreline one foot for every foot exposed. Bulkheads have two major drawbacks. The first is the high cost of the structure and the second is that they are doomed to massive failure from the forces of nature. Wood bulkheads are not recommended. Toxins leach out from the treated wood. When damaged, floating battering rams escape.

                        steel seawall protecting shoreline     concrete wall protecting shoreline

Plantings may be used to stabilize the area along with the above (hard) practices
With minimal expense, preparation, and maintenance, wildflowers, grasses, shrubs and trees will hold your property in place. Plantings can be incorporated into the riprap, above it, and / or in place of the usual high-maintenance lawn. Natural beauty, healthy protection, and wildlife could be your reward. You can create attractive yards that will require little or no fertilizer, pesticides or irrigation to keep them healthy and vibrant. Suggested species have deep root systems that trap and hold the soil to keep it from washing away.

Assessment
Annual ssessments are done by project staff in the spring to prioritize sites according to highest need / worst erosion.

Cost Share Eligibility / Signup
To be eligible for cost share, the shoreline must be located on Lake Kampeska or Lake Pelican, in Codington County, SD.

In order to be considered for cost share, submit a shoreline signup form. Cost share is based on a percentage of the cost for rock riprap, no matter what kind of protection is chosen. No retroactive payments can be made on work completed before submission and approval of the projected stabilization. Cost share depends on the availability of funds.

Free consultation is available for sites in Codington County, even when there is no cost share. For more information, contact the office.