Shoreline erosion – including erosion caused by currents, flood, wind or wave action – is a natural phenomenon associated with properly functioning shoreline environments. However, erosion can put existing structures and uses at risk. In some cases, shoreline stabilization is necessary to protect existing uses and development from naturally occurring erosion. Shoreline stabilization includes actions taken to address erosion impacts to property and dwellings, businesses, or structures caused by natural processes, such as current, flood, wind, or wave action. These actions include nonstructural and structural methods.
Nonstructural methods include building setbacks, relocation of the structure to be protected, groundwater management, planning and regulatory measures to avoid the need for structural stabilization.
Structural stabilization measures include:
Vegetation enhancement; |
Anchor trees; |
Gravel placement; |
Rock revetments; |
Gabions; |
Concrete groins; |
Retaining walls and bluff walls; and |
Bulkheads. |
Structural stabilization measures can be "hard" or "soft." "Hard" structural stabilization refers to those with solid, hard surfaces, such as concrete bulkheads, while "soft" structural measures rely on less rigid materials, such as biotechnical vegetation measures.
Generally, the harder the construction measure, the greater the impact on shoreline processes, including sediment transport, geomorphology, and biological functions. Additionally, hard structures, especially vertical walls, often create conditions that lead to failure of the structure. Failed bulkheads and walls adversely impact beach aesthetics, may be a safety or navigational hazard, and may adversely impact shoreline ecological functions.
A. Policies. Pursuant to RCW
36.70A.480, the shoreline stabilization policies of the 2021 Kittitas County Shoreline Master Program shall be considered as policies of the Kittitas County Comprehensive Plan.
B. Regulations.
1. New uses and developments shall be located and designed to avoid the need for future shoreline stabilization to the extent feasible.
2. Subdivision of land should not create lots that will require shoreline stabilization in order for reasonable use or development to occur.
3. New uses and developments on steep slopes or bluffs shall be set back sufficiently to ensure that shoreline stabilization is unlikely to be necessary during the life of the structure, as demonstrated by a geotechnical analysis.
4. New uses and developments that would require shoreline stabilization which causes significant impacts to adjacent or down-current properties and shoreline areas shall not be allowed.
5. New structural stabilization measures shall only be allowed for the following instances, and then only when necessity is demonstrated based on criteria included in this Section:
a. When necessary to protect an existing primary structure;
b. In support of new non-water-dependent development, including single-family residence;
c. In support of new water-dependent development; and
d. To protect projects for the restoration of ecological functions or hazardous substance remediation projects.
6. New or enlarged structural shoreline stabilization measures for an existing primary structure, including residences, are permitted only if there is conclusive evidence, documented by a geotechnical analysis, that the structure is in danger from shoreline erosion caused by stream processes or waves. Normal sloughing, erosion of steep bluffs, or shoreline erosion itself, without a scientific or geotechnical analysis, is not demonstration of need. The geotechnical analysis shall evaluate on-site drainage issues and address drainage problems away from the shoreline edge before considering structural shoreline stabilization.
7. New structural stabilization for new non-water-dependent development, including single-family residences, is permitted only if it can be demonstrated that:
a. The erosion is not being caused by upland conditions, such as the loss of vegetation and drainage;
b. Nonstructural measures, such as placing the proposed use or development further from the shoreline, planting vegetation, or installing on-site drainage improvements, are not feasible or not sufficient; and
c. The need to protect primary structures from damage due to erosion is demonstrated through a geotechnical report that states damage was caused by natural processes, such as stream processes or waves.
8. New structural stabilization for water-dependent development is permitted only if it can be demonstrated that:
a. The erosion is not being caused by upland conditions, such as the loss of vegetation and drainage;
b. Nonstructural measures, planting vegetation, or installing on-site drainage improvements, are not feasible or not sufficient; and
c. The need to protect primary structures from damage due to erosion is demonstrated through a geotechnical report.
9. New structural stabilization to protect projects for the restoration of ecological functions or hazardous substance remediation projects is permitted only if it can be demonstrated that nonstructural measures, planting vegetation, or installing on-site drainage improvements, are not feasible or not sufficient.
10. An existing shoreline stabilization structure may be replaced with a similar structure if there is a demonstrated need to protect primary uses or structures or public facilities from erosion caused by stream undercutting or wave action.
11. Soft shoreline stabilization measures that provide restoration of shoreline ecological functions may be permitted waterward of the OHWM, provided a geotechnical analysis documents that alternative solutions are not feasible or do not provide sufficient protection.
12. Replacement walls or bulkheads shall not encroach waterward of the OHWM or existing structure unless the residence was occupied prior to January 1, 1992, and there are overriding safety or environmental concerns. In such cases, the replacement structure shall abut the existing shoreline stabilization structure.
13. All new, expanded, or replacement shoreline stabilization shall be permitted only if it can be demonstrated that the erosion rate exceeds that which would normally occur in a natural condition, that the measure does not interfere with fluvial hydrological and geo-morphological processes normally acting in natural conditions, and that the proposed measures will not result in a net loss of shoreline ecological functions.
14. For purposes of this Section, "replacement" means the construction of a new structure to perform a shoreline stabilization function of an existing structure which can no longer adequately serve its purpose. Additions to or increases in size of existing shoreline stabilization measures shall be considered new structures.
15. Geotechnical reports that address the need to prevent potential damage to a primary structure shall address the necessity for shoreline stabilization by estimating time frames and rates of erosion and report on the urgency associated with the specific situation. Hard armoring solutions should not be authorized except when a geotechnical report confirms that there is a significant possibility that the primary structure will be damaged within three (3) years as a result of shoreline erosion in the absence of hard armoring measures, or where waiting until the need is that immediate, would foreclose the opportunity to use measures that avoid impacts on ecological functions. Where the geotechnical report confirms a need to prevent potential damage to a primary structure, but the need is not as immediate as the three (3) years, the report may still be used to justify more immediate authorization to protect against erosion using soft measures.
16. When structural shoreline stabilization measures are demonstrated to be necessary, the following provisions shall apply:
a. The size of stabilization measures shall be limited to the minimum necessary. Use measures designed to assure no net loss of shoreline ecological functions;
b. Soft approaches shall be used unless demonstrated not to be sufficient to protect primary structures, dwellings, and businesses; and
c. Publicly financed or subsidized shoreline erosion control measures should not restrict appropriate public access to the shoreline except where such access is not feasible because of incompatible uses, safety, security, or harm to ecological functions. See KCC §
17B.05.040 Public access. Where feasible, incorporate ecological restoration and public access improvements into the project.
17. Breakwaters, jetties, groins, and weirs shall:
a. Be located waterward of the OHWM and shall be allowed only where necessary to support water-dependent uses, public access, shoreline stabilization, or other specific public purposes; and
b. Require a conditional use permit; except for those structures installed to protect or restore ecological functions.
18. Shoreline stabilization projects shall be designed to protect critical areas and shall avoid and reduce significant ecological impacts by providing for mitigation according to the sequence in KCC § 17B.05.020(B)(2).
19. Public access shall be required as part of publically financed shoreline erosion control measures.
20. Shoreline stabilization projects shall be designed and constructed to avoid or minimize impacts to sediment transport.
(Ord. 2021-006, 2021; Ord. 2016-006, 2016)