| Tweet |
Custom Search
|
|
|
||
 City of Solana Beach
Section 2
Shoreline and Coastal Bluff Management Strategies Draft MEIR
Project Description
conditions at various cross-section locations. The design feature has a crest elevation at over
15 feet above MLLW with a slope face inclination of 1.5:1 (horizontal:vertical) at a depth of
about 15 feet from the bluff face. Notches in the bluffs are filled with grout behind the
revetments. Revetments are constructed of various layers consisting of a 2-inch layer of No. 2
backing filter fabric, 4-inch layer of 1-inch stone, and topped with a 9-inch layer of 5-inch stone.
Depending upon the specific site location of revetments, lengths of revetments could range from
5 feet to hundreds of feet (AMEC 2001).
Cobble Berms
A cobble berm is a non-conventional approach to readdress the seacliff erosion problem. The
design would entail import and placement of large quantities of cobble to form a berm at the
seacliff toe. The concept is an attempt to simulate what naturally occurs in the cobble beach in
Solana Beach. The cobble berm would be designed to have a crest elevation at over 15 feet,
MLLW, a crest width of 20 feet and a fronting face slope of 2:1 (horizontal:vertical). Although
the stability and transport dynamics of cobble are not well known, it appears that groin-like
structures help to preserve accumulations of the material in much the same way that
conventional groins do with sand. Depending upon the specific site location of revetments,
lengths of cobble berms could range from 5 feet to hundreds of feet (AMEC 2001).
2.1.3 Location
As mentioned above, approximately 45 percent of the Solana Beach's coastline has various
types of shoreline and bluff protection devices in place. It would be too speculative to describe
site-specific locations for the construction of future shoreline protection devices and which
specific device would be constructed due to the unpredictability of wave and tide conditions,
beach width, and cliff strength (Flick 2001). Site observations indicate that there are currently
three unfilled seacaves along Solana Beach's shoreline that could be filled consistent with the
City's existing ordinance, which promotes the construction of seacave plugs and fills over
seawalls (Figures 2-1, 2-2, and 2-4).
2.1.4 Implementation
The costs to implement various shoreline and bluff protection devices in order to protect private
property would be the responsibility of the private property owner. Private property owners
would be responsible for all design studies, construction, and maintenance costs of the devices.
A permit is required by the City's ordinance for the construction of all shoreline and bluff
protection devices. Shoreline and bluff protection devices constructed to protect any public
lands would be the responsibility of the City of Solana Beach through its capital improvements
budget. Estimated costs for various shoreline and bluff protection devices are shown in Table
2-1 below.
Project No. 323530000
Page 2-21
|
 
|
|
|
||
