§ 150.26. General requirements and minimum design standards.

(A)

All commercial and residential developments in the city adjacent to the water must install suitable bulkhead along the banks the entire length of the property shoreline. The bulkheads shall be designed and installed in such manner as to insure proper soil and land retention and the effective reduction of storm damage and erosion.

(B)

In the design of bulkheading for the city, the foundation and backfill conditions, the exposure to wave action and scour, regulatory floods and the type of materials shall all be taken into consideration. The plans shall be submitted to the city for approval prior to construction of any bulkheads.

(C)

A typical timer bulkhead design is shown in Detail "A". Detail "A" is shown for graphic representation of what is considered a typical bulkhead for the city and represents a minimum design requirement only, The bulkhead in Detail "A" should not be considered as a design, nor should they be represented as being appropriate for any given circumstances or condition as may occur, nor should they be considered as the only type of design allowed by the city. Other modifications or differing designs might be allowed if designed by a Registered Professional Engineer as outlined in this subchapter.

(D)

Proper construction procedures shall be followed at all times in the driving and placing of bulkheading in the jurisdiction of the city. Furthermore, care should be taken to insure that damage does not occur to or result from the driving procedures of the plies or the sheet piling used in the bulkhead. Any piling so damaged will be removed and replaced.

(E)

All bulkhead sheet piling shall be driven at least 50 percent of its length below the mud line.

(F)

A suitable waterproof sheeting called filter cloth shall also be placed in the entire length and height of the bulkhead prior to backfilling of material.

(G)

All bulkheads shall be constructed with tie-back anchor rods. Such rods shall be a minimum three-fourths inch diameter galvanized steel spaced on maximum six feet centers. Rods shall be continuous without lap welds, couplings or turnbuckles.

(H)

Each tie-back rod shall be attached to a separate reaction anchor pile or to a horizontally aligned treated timber deadman. Such reaction pile or deadman shall be located behind a minimum distance of one and one-half times the sheet pile length.

(I)

A reaction pile shall be a minimum 6" x 6" square or 7" diameter, treated timber pile equal in length to the sheet piling, driven a minimum distance of 70 percent of its length into undisturbed soil.

(J)

A treated timber deadman shall be a minimum 8" x 10" square.

(K)

The tops of the deadman or reaction pile shall be a minimum of three feet below finished grade.

(L)

The use of house pilings, concrete foundations, driveways, or other structures for anchorage points in lieu of anchor piles or deadman will not be permitted unless design of such is submitted and sealed by a Registered Professional Engineer and approved by the Building Official.

(M)

The following criteria shall apply to timber bulkheads:

(1)

All lumber used which will be below normal high tide level shall be of 2.5 treated type (CCA Type C Saltwater Treatment).

(2)

The sheet piling shall be driven at least 50 percent of its length below the mud line.

(3)

The out board piling at the face of the bulkhead will be driven a minimum of four feet below the bottom of the timber sheets on maximum six feet spacing.

(4)

Sheet piling shall be a minimum two inch thick, tongue and groove sheeting.

(5)

Out board piles shall be a minimum six inch treated timber. Timber wales on wooden bulkheads are to be placed outside of sheet piling at a minimum of two locations, one at the top of sheeting and the other two-thirds of the distance from the top to the mud line. Wales are to be placed behind water piles as shown in Detail "A". Three wales will be required when exposure of wood exceeds six feet.

(6)

All nails, screws and bolting used in the construction of the bulkhead shall be galvanized.

(N)

The following criteria shall apply to concrete bulkheads:

(1)

The sheet piling shall be driven at least 50 percent of its length below the mud line.

(2)

The sheet piles shall be minimum of six inch thick and maximum of six feet wide pre-cast tongue and groove sheets.

(3)

The concrete and structural design of the sheets and cap shall conform to § 150.27(C).

(4)

Filter cloth is recommended for full width installation behind the wall. An acceptable alternate method of seating joints is to place a thick layer (12 inches wide by 4-inch minimum thickness) of high strength concrete grout behind each joint from bottom of cap to mud line.

(Ord. 99-753, passed 10-18-99)