Source: SILTS Summer 2006 newsletter

Source: SILTS Summer 2006 newsletter

In 2002 Thurber Engineering measured erosion rates at 51 locations on the Island. They discovered that over the past 32 years there was an erosion rate of 13 meters for the south side of the Island and 8 meters for the north side (plus or minus 1 meter).

Hence, the average yearly erosion rates are: 0.41m/yr on the south side and 0.25m/yr on the north side.
(Source: Thurber Report, 2003)

Erosion Rates Map

Slowly but surely Savary Island is disappearing.

Click here to view a map of Savary's Erosion rates, which was compiled by the PRRD in 2003.

How to fight erosion

Here's some advice from SILTS (Summer 2006 newsletter):

(1) Existing vegetation on slopes and crests should not be removed. Removing vegetation severely compromises the slope and increases the erosion/sloughing potential.

(2) Established native plant communities (whether herbaceous, such as the sloping meadow or tree and shrubs) should be left alone. Vegetation is critical in controlling erosion. Existing native plant communities along the perimeter — expecially those on the Crown Land Perimeter — should be left alone! Maintaining a buffer zone of native vegetation is essential to protecting the island.

How to stabilize your slope using vegetation

Click here to read the Washington State Department of Ecology's manual Slope Stabilization and Erosion Control Using Vegetation.

Also, a list of suggested native plants that are suitable to plant on Savary bluff-slope crests can be found in the Thurber Report (Pg 17).
Categories: geography

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