N.J. Admin. Code § 7:7-9.19

Current through Register Vol. 56, No. 24, December 18, 2024

Section 7:7-9.19 - Erosion hazard areas

(a) Erosion hazard areas are shoreline areas that are eroding and/or have a history of erosion, causing them to be highly susceptible to further erosion, and damage from storms.

1. Erosion hazard areas may be identified by any one of the following characteristics:

i. Lack of beaches;

ii. Lack of beaches at high tide;

iii. Narrow beaches;

iv. High beach mobility;

v. Foreshore extended under boardwalk;

vi. Low dunes or no dunes;

vii. Escarped foredune;

viii. Steep beach slopes;

ix. Cliffed bluffs as adjacent to beach;

x. Exposed, damaged or breached jetties, groins, bulkheads or seawalls;

xi. High long-term erosion rates; or

xii. Pronounced downdrift effects of groins (jetties).

2. Erosion hazard areas extend inland from the edge of a stabilized upland area to the limit of the area likely to be eroded in 30 years for one to four unit dwelling structures, and 60 years for all other structures, including developed and undeveloped areas. This distance is measured from the crest of a bluff for coastal bluff areas, the most seaward established dune crest for unvegetated dune areas, the first vegetation line from the water for established vegetated dune areas, and the landward edge of a beach or the eight foot North American Datum (NAD), 1983, contour line, whichever is farther inland, for non-dune areas.

i. An established, unvegetated dune is a dune that has been in place for at least two winter seasons, or has been constructed with the approval of the Department.

ii. An established vegetated dune is a dune with an existing vegetative cover which has been growing on site for at least two growing seasons.

3. The extent of an erosion hazard area is calculated by multiplying the projected annual erosion rate at a site by 30 for the development of one to four unit dwelling structures and by 60 for all other developments.

(b) Development is prohibited in erosion hazard areas, except for:

1. Linear development which meets the rule on location of linear development, N.J.A.C. 7:7-14.1;

2. Shore protection activities which meet the appropriate coastal engineering rule, N.J.A.C. 7:7-15.11;

3. Single story, beach/tourism oriented commercial development located within a commercial boardwalk area existing on July 19, 1993, is conditionally acceptable provided that it meets the following conditions:

i. The site is located within an area currently used and zoned for beach related commercial use, and is landward of and adjacent to the boardwalk;

ii. The height of the building does not exceed 15 feet measured from either the elevation of the existing ground or the boardwalk (depending on the specific site conditions) to the top of a flat roof or the mid-point of a sloped roof;

iii. The facility is open to the general public and supports beach/tourism related recreational activities, that is, retail, amusement and food services. Lodging facilities are excluded;

iv. The facility meets all the requirements of the flood hazard area rule, N.J.A.C. 7:7-9.25; and

v. The development complies with the requirements for impervious cover and vegetative cover that apply to the site under N.J.A.C. 7:7-13;

4. Single-family and duplex developments that meet the standards of N.J.A.C. 7:7-15.2(e) or (f);

5. The construction of dune walkover structures and at-grade walkover pathways, in accordance with Department standards found at N.J.A.C. 7:7-10;

6. Dune creation and beach maintenance activities in accordance with Department standards found at N.J.A.C. 7:7-10; and

7. The following development in Atlantic City provided it meets the standards of N.J.A.C. 7:7-9.47:

i. Development on or over existing ocean piers;

ii. Pilings necessary to support development proposed on or over existing ocean piers; and

iii. Development on or over the Boardwalk.

(c) Rationale: As a result of continuing rising sea levels, active storm induced sand movements, and offshore currents (littoral drift), most of the Atlantic coastline of New Jersey is retreating. Coastal erosion also affects the bayshores of New Jersey. The rate of retreat, or erosion, is not uniform, and varies locally depending upon the nature and magnitude of coastal processes operating within individual parts of the shoreline. Certain parts of the shoreline have a higher risk for future erosion.

Development other than shore protection measures and linear development is prohibited in these areas in order to protect public safety and prevent loss of life and property. However, in certain oceanfront communities where an existing municipal boardwalk (including all adjacent resort-oriented commercial establishments) has long been featured as the main attraction of that resort community and is already densely aligned with buildings, low intensity infill may be permitted. At these specific locations, the gain in public use and enjoyment of the beach, ocean and boardwalk facilities outweighs the limited, potential additional loss in property damages.

The annual rate of erosion shall be calculated on a case-by-case basis by using the best available data and scientific methodology. Historical erosion rates of areas need to be analyzed to determine the particular past trend that best reflects the current shoreline processes affecting that area. The appropriate long or short term historical erosion rate of an area is then combined with other information, which may help to explain the erosion rate of an area, to determine a projected erosion rate for the next thirty to sixty years. These factors include, but are not limited to: past or on-going shore protection activities, e.g., beachfills, or groin, revetment, or bulkhead constructions, and past or on-going navigation channel dredging projects and past storm events.

The Department will use a computer program, entitled "Digital Shoreline Analysis System," developed by USGS, to produce historical shoreline change maps for specific sites along the oceanfront. These maps will be used to establish the appropriate long or short term trend in shoreline changes that will most likely continue in the future for a specific site.

The projected annual erosion rate or historical shoreline change data for a specific site, excluding the Raritan Bay area, may be obtained from the Department by written request accompanied by a site plan which identifies the site by either the "state plane" coordinate system or latitude -longitude coordinates. For sites located along the Raritan Bay, the annual erosion rate can be found in Paul A. Gares, Karl F. Nordstorm and Norbert P. Psuty, Coastal Dunes: Their Function, Delineation and Management, Center for Coastal and Environmental Studies, Rutgers University for NJDEP, 1979. Other appropriate sources including verifiable aerial photography, may also be consulted.

N.J. Admin. Code § 7:7-9.19

Renumbered from 7:7E-3.19 by 47 N.J.R. 1392(a), effective 7/6/2015

Amended by 50 N.J.R. 361(a), effective 1/16/2018