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FEMA Region II Morris County Digital Flood Insurance Rate Map (DFIRM) FEMA Region 2 Mitigation Division April 28th, 2010 10:00-11:00 or 14:00-15:00.

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Presentation on theme: "FEMA Region II Morris County Digital Flood Insurance Rate Map (DFIRM) FEMA Region 2 Mitigation Division April 28th, 2010 10:00-11:00 or 14:00-15:00."— Presentation transcript:

1 FEMA Region II Morris County Digital Flood Insurance Rate Map (DFIRM) FEMA Region 2 Mitigation Division April 28th, :00-11:00 or 14:00-15:00

2 Purpose Purpose of this Coordination Call: To establish the awareness and understanding in the ongoing collaborative efforts to update Community’s flood risk analysis and mapping (ie. FIS and DFIRM). Who is Involved: TEAM comprised of Federal/State/Local/Contract Partners - Federal – FEMA, Region II Project Manager; Paul K. Weberg, PE Communications/Outreach Support; Adie Koby Technical Assistance; Alan Springett Engineering Contacts: Regional Support Center (RSC2); Andrew Martin, Tolga Yilmaz Regional Program Management Lead (RPML); Bo Juza Map Mod Mapping Partner; NTHMC – Roger Kowieski, PE Risk MAP Mapping Partner; RAMPP, JV – Robyn Boyd State – NJDEP, Joseph Ruggeri, P.E., CFM Supervising Engineer NJ State NFIP Coordinator's Office Bureau of Dam Safety & Flood Control Office of Engineering & Construction Local – Morris County & Communities

3 Purpose WHY: maintain an up-to-date and accurate flood risk analysis and delineation for local decision makers in flood risk management. This SUCCESS of this effort and outcome relies on the active participation of EACH COMMUNITY

4 Objective Overview of current DFIRM mapping status of Morris County Future projects and next steps QA/QC & Feedback from the communities

5 Current Status of Morris County DFIRM Mapping Mapping partner to deliver countywide preliminary maps to Morris communities Friday, April 30 th 2010 Preliminary DFIRM Project Team ◦NTHMC, Inc. ◦AECOM Preliminary DFIRM Tasks -Base Map Acquisition -Redelineation -New Detailed Hydrology & Hydraulics (H&H) -FIS Report Production -Terrain data processing -DFIRM panel and database production -Preliminary DFIRM Production and Distribution

6 Morris County – 4/30/2010 Preliminary DFIRMs Preliminary DFIRM Scope of Work: The selection of study streams were primarily driven by a severe flooding of August 11-14, 2000, which impacted several areas in Morris, Sussex, and Hunterdon Counties. This flooding was well documented in the USGS WRI Report , which was reviewed by NTHMC and discussed with FEMA, USGS and NJDEP

7 Morris County – 4/30/2010 Preliminary New Detailed Studies COMMUNITYFLOODING SOURCEMILES Mendham Township and Chester Township Burnett Brook4.1 Harmony Brook1.7 Passaic River2.9 Whippany River1.3 Indian Brook (includes Chester Twp.)1.3 Sub-total11.3 Rockaway Township and Rockaway Borough Hibernia Brook4.2 Fox Brook (includes Rockaway Borough)1.6 Sub-total5.8 Lincoln Park Borough and Pequannock Township West Ditch1.9 Sub-total1.9 Grand Total19

8 Morris County – 4/30/2010 Preliminary Re-delineation Re-delineation 69 streams, 370 miles of detailed study reaches 73 streams, 111 miles of approximate 1% annual-chance floodplains Using updated digital topography (LIDAR collected in 2005) provided by the Morris County, The Department of Planning, Development, and Technology, GIS Department

9 Morris County – 4/30/2010 Preliminary Studied Streams

10 Morris County – 4/30/2010 Preliminary Flood Hazard Areas

11 Morris County – 4/30/2010 Preliminary Map Modernization Converts the existing manual format flood maps to a GIS-based digital format Includes a Digital FIRM Database Updates the base map to 2005 orthophotography Converts flood hazard data from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88)  NAVD 88 = NGVD 29 (–0.78)

12 Morris County – 4/30/2010 Preliminary Problems Encountered Discrepancies in the 100-year water surface elevations between adjacent communities (15 out of 39 Municipalities) Missing delineations between adjacent communities (gaps in the delineations)

13 Morris County – 4/30/2010 Preliminary Problem Area Examples Stream Name Stream Length In MilesMunicipality Type of Discrepancy in the 100-year WSE Flood ProfilesMaps Other ElevationDifferenceElevationDifference Watnong Brook1.79 Morris Plains Borough (downstream side) Eff. Map 07/05/ Parsippany-Troy Hills Township (upstream side) Eff. Map 02/19/ lower lower Beaver Dam Brook 5.33 Lincoln Park Borough (downstream side) Eff. Map 08/19/ Montville Township (upstream side) Eff. Map 08/19/ higher Pinch Brook2.57 East Hanover Township (downstream side) Eff. Map 06/06/ (adjusted for NAVD) 1.3 lower

14 Morris County – 4/30/2010 Preliminary Problem Area Examples Borough of Morris Plains BFE: 450 Township of Parsippany-Troy Hills BFE: 448 The 100-year floodplain elevation at the corporate limit between Morris Plains and Parsippany-Troy Hills has an elevation drop of approx. 2 feet

15 Morris County – 4/30/2010 Preliminary Problem Area Examples Pequannock River, Riverdale Borough - The bridge going over Interstate 287 is not located on the flood profile

16 Morris County - Future Work Revised Preliminary New mapping partner (RAMPP) to start revising and deliver revised preliminary maps on June, 2011 Revised Preliminary DFIRM Scope of Work: Approximately 31 miles of detailed analysis for various streams due to mismatches found during the first-time countywide mapping effort 14 miles of detailed analysis for the Passaic River Revised Preliminary DFIRM Current Status: Field survey for the approximately 31 miles of detailed analysis for various streams has been completed Awaiting the completed survey of the 14 miles of the Passaic River project and also to obtain the preliminary countywide mapping data

17 Morris County - Future Work New Detailed Studies COMMUNITYFLOODING SOURCE(S) PANEL(S) AFFECTED* Boonton TownshipRockaway River, Stony Brook162, 166, 158, 159 Borough of Florham Park Black Brook, Pinch Brook, Tributary to Spring Garden Brook316, 318, 319 East Hanover TownshipPassaic River, Pinch Brook316, 318, 329 Hanover TownshipTributary 1 to Malapardis Brook317 Harding TownshipTributary to Great Brook313 Borough of KinnelonPequannock River43, 44, 63 Borough of Lincoln Park Beaver Dam Brook, Little Beaver Dam, Passaic River 187, 189, 191, 192, 193 Borough of MadisonTributary to Spring Garden Brook319 Montville Township Beaver Dam Brook, Little Beaver Dam, Passaic River186, 187, 189, 327 Borough of Morris PlainsWatnong Brook301, 303 Mendham TownshipMcVickers Brook269, 288 Mt. Olive TownshipConlon Pond Brook252 Parsippany-Troy Hills TownshipWatnong Brook301 Randolph TownshipDen Brook281, 283 Borough of RiverdalePequannock River64, 75, 177, 181

18 Morris County - Future Work New Detailed Studies FLOODING SOURCEReachUpstream LimitDownstream Limit Watnong Brook 4.0Powder Mill PondAt Hanover Avenue Beaver Dam Brook 4.1At Waughaw Rd and Duynecrest RdAt confluence with Pompton River Pinch Brook 2.3At Timber Hill DrAt confluence with Black Brook Rockaway River 2.8At Boonton Township Corporate Limit Tributary to Great Brook 0.7At James SAt Confluence with Great Brook Pequannock River 3.1At Riverdale Borough Corporate LimitAt confluence with Pompton River Pequannock River 4.5At Kinnelon Borough Corporate Limits Conlon Pond Brook 1.8At Mount Olive Corporate LimitAt Confluence with Drakes Brook Little Beaver Brook 0.9At Jacksonville RdAt Confluence with Beaver Dam Brook Stony Brook 1.0At Montville Township Corporate LimitAt Route 618 McVickers Brook 0.5At Brookrace DrAt Mendham Township Corporate Limit Tributary 1 to Malapardis Brook 0.7At Town of Hanover Corporate LimitAt Interstate 287 Black Brook1.3At Morris County corporate limitAt Florham Park Borough Corporate Limit Den Brook2.1At 350 feet upstream of Radtke RdAt Randolph Township Corporate Limit Tributary to Spring Garden Brook0.6At Madison Borough Corporate limitAt Confluence with Spring Garden Brook Passaic River14.0County Boundary Total44.4

19 Morris County - Future Work New Detailed Studies

20 The Road to Ordinance Re-Adoption 6 month: FEMA 6-month LFD Letter 5 month: NJDEP Assistance Letter 3 ½ month: Draft Ordinance 3 month: NJDEP review of draft ordinance 3 month: FEMA 90-day Reminder Letter 1 month: FEMA 30-day Reminder Letter 0: Ordinance Adopted

21 Questions & Feedback Contact Information FEMA Region II Paul Weberg, DHS/FEMA Region II 290 Broadway, 29 th Floor New York, NY (212) NJDEP office: John Scordato / Joseph Ruggeri / Chris Gould / NJDEP, Bureau of Dam Safety & Flood Control (609) phone, (609) fax Visit NJDEP website: Download Model Ordinances:


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