This chapter, in conjunction with the Uniform Construction Code, provides minimum requirements for development located in flood hazard areas, including the subdivision of land and other developments; site improvements and installation of utilities; placement and replacement of manufactured homes; placement of recreational vehicles; new construction and alterations, repair, reconstruction, rehabilitation or additions of existing buildings and structures; substantial improvement of existing buildings and structures, including repair of substantial damage; installation of tanks; temporary structures and temporary or permanent storage; utility and miscellaneous Group U buildings and structures; and certain building work exempt from permit under the Uniform Construction Code; and other buildings and development activities.
A. 
The Borough of Riverdale was accepted for participation in the National Flood Insurance Program on October 15, 1985.
B. 
The National Flood Insurance Program (NFIP) floodplain management regulations encourage that all federal, state, and local regulations that are more stringent than the minimum NFIP standards take precedence in permitting decisions. The FHACA requires that the effective Flood Insurance Rate Map, most recent preliminary FEMA mapping and flood studies, and Department delineations be compared to determine the most restrictive mapping. The FHACA also regulates unstudied flood hazard areas in watersheds measuring 50 acres or greater in size and most riparian zones in New Jersey. Because of these higher standards, the regulated flood hazard area in New Jersey may be more expansive and more restrictive than the FEMA special flood hazard area. Maps and studies that establish flood hazard areas are on file at the office of the floodplain administrator, located at the Borough of Riverdale Municipal Building, 91 Newark-Pompton Turnpike, Riverdale, NJ.
C. 
The following sources identify flood hazard areas in this jurisdiction and must be considered when determining the best available flood hazard data area:
(1) 
Effective flood insurance study. Special flood hazard areas (SFHAs) identified by the Federal Emergency Management Agency in a scientific and engineering report entitled Flood Insurance Study, Borough of Riverdale, Morris County, New Jersey, Community Number 340359, Product ID 340359V000, dated October 15, 1985, and the accompanying Flood Insurance Rate Map (FIRM) and Flood Boundary and Floodway Map identified in Table 104-12(1) whose effective date is October 15, 1985, are hereby adopted by reference.
Table 104-12(1)
Map Panel No.
Effective Date
Revision
Type
340359 0001B
10-15-1985
B
Flood Insurance Rate Map
340359 0001
10-15-1985
Flood Boundary and Floodway Map
(2) 
Federal best available information. The Borough of Riverdale shall utilize federal flood information as listed in the table below that provides more detailed hazard information, higher flood elevations, larger flood hazard areas, and results in more restrictive regulations. This information may include but is not limited to preliminary flood elevation guidance from FEMA (such as Advisory Flood Hazard Area Maps, Work Maps or Preliminary FIS and FIRM). Additional federal best available studies issued after the date of this chapter must also be considered. These studies are listed on FEMA's Map Service Center. This information shall be used for floodplain regulation purposes only.
Table 104-12(2)
Map Panel No.
Preliminary Date
34027C0064F
2-26-2016
34027C0075F
2-26-2016
34027C0177F
8-22-2017
34027C0181F
8-22-2017
Flood Study No.
Preliminary Date
34027CV001A
8-22-2017
34027CV002A
8-22-2017
34027CV003A
8-22-2017
34027CV004A
8-22-2017
34027CV005A
8-22-2017
34027CV006A
8-22-2017
34027CV007A
8-22-2017
34027CV008A
8-22-2017
(3) 
Other best available data. The Borough of Riverdale shall utilize high water elevations from flood events, groundwater flooding areas, studies by federal or state agencies, or other information deemed appropriate by the Borough of Riverdale. Other best available information may not be used which results in less restrictive flood elevations, design standards, or smaller flood hazard areas than the sources described in Tables 104-12(1) and (2), above. This information shall be used for floodplain regulation purposes only.
(4) 
State regulated flood hazard areas. For state-regulated waters, the NJ Department of Environmental Protection (NJDEP) identifies the flood hazard area as the land, and the space above that land, which lies below the Flood Hazard Area Control Act Design Flood Elevation, as defined in Article IX, and as described in the New Jersey Flood Hazard Area Control Act at N.J.A.C. 7:13. A FHACA flood hazard area exists along every regulated water that has a drainage area of 50 acres or greater. Such area may extend beyond the boundaries of the special flood hazard areas (SFHAs) as identified by FEMA. The following is a list of New Jersey State studied waters in this community under the FHACA, and their respective map identification numbers.
Table 104-12(3) List of State Studied Waters
Name of Studied Water Pequannock River
Section Studied Entire Reach
File Name
Stream
Project
Sheet Number
Image Type
Community Reference
BDALE007
Pequannock River
Bloomingdale
01P
Profile
Borough of Bloomingdale
BDALE008
Pequannock River
Bloomingdale
02P
Profile
Borough of Bloomingdale
G0000099
Pequannock River
G
02P
Profile
Borough of Bloomingdale
G0000100
Pequannock River
G
01P
Profile
Borough of Bloomingdale
G0000101
Pequannock River
G
04P
Profile
Borough of Riverdale
G0000102
Pequannock River
G
03P
Profile
Borough of Riverdale
G0000103p
Pequannock River
G
02P
Profile
Borough of Riverdale
G0000107
Pequannock River
G
06P
Profile
Borough of Pompton Lakes
G0000108
Pequannock River
G
05P
Profile
Borough of Pompton Lakes
BDALE003
Pequannock River
Bloomingdale
3 of 4
Plan
Butler, Riverdale and Bloomingdale
BDALE006
Pequannock River
Bloomingdale
3a of 4
Plan
Butler, Riverdale and Bloomingdale
G0000038
Pequannock River
G
0-10
Plan
N/A
G0000039
Pequannock River
G
0-9
Plan
N/A
A. 
The local design flood elevation (LDFE) is established in the flood hazard areas determined in § 104-12, above, using the best available flood hazard data sources, and the Flood Hazard Area Control Act[1] minimum statewide elevation requirements for lowest floors in A zones, ASCE 24 requirements for critical facilities as specified by the building code, plus additional freeboard as specified by this chapter.
[1]
Editor's Note: See N.J.S.A. 58:16a-50 et seq.
B. 
At a minimum, the local design flood elevation shall be as follows:
(1) 
For a delineated watercourse, the elevation associated with the best available flood hazard data area determined in § 104-12, above plus one foot of freeboard or as described by N.J.A.C. 7:13; or
(2) 
For any undelineated watercourse [where mapping or studies described in Tables 104-12(1) and (2) above are not available] that has a contributary drainage area of 50 acres or more, the applicants must provide one of the following to determine the local design flood elevation:
(a) 
A copy of an unexpired NJDEP flood hazard area verification; or
(b) 
A determination of the flood hazard area design flood elevation using Method 5 or Method 6 (as described in N.J.A.C. 7:13) and is sealed and submitted according to §§ 104-38 and 104-39.
(3) 
AO Zones. For Zone AO areas on the municipality's FIRM (or on preliminary flood elevation guidance from FEMA), the local design flood elevation is determined from the FIRM panel as the highest adjacent grade plus the depth number specified plus one foot of freeboard. If no depth number is specified, the local design flood elevation is three feet above the highest adjacent grade.
(4) 
Class IV critical facilities. For any proposed development of new and substantially improved flood design Class IV critical facilities, the local design flood elevation must be the higher of the 0.2% annual chance (500-year) flood elevation or the flood hazard area design flood elevation with an additional two feet of freeboard in accordance with ASCE 24.