County of Hawaii - Flood Awareness

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TWITTER
Tuesday
Jul282015

DRAFT FLOOD STUDIES - WHAT ARE THEY AND HOW DO THEY AFFECT THE COMMUNITY?

A “draft” flood study is a flood study that is intended for review by the Federal Emergency Management Agency (FEMA), but hasn’t been officially adopted as an “effective” Flood Insurance Rate Map (FIRM).  An effective FIRM is used by insurance companies and lenders to establish rates for flood insurance on properties with federally backed mortgages. 

A draft flood study is used by Hawai‘i County to regulate development, regardless of whether it has been adopted by FEMA.  The following is a list of draft flood studies yet to be formally adopted by FEMA:

The Puna Flood Study covers approximately 282 square miles and extends from Volcano Village through Kea‘au and down to Maku‘u Drive in Hawaiian Paradise Park Subdivision.  It establishes flood zones in an area that has never been mapped, and affects Tax Map Keys 1-6, 1-7, 1-8 and 1-9.  It is not being used to regulate development at this time, However, the County will resume its use for regulating developement on November 16, 2015.   Individual notices were mailed in September to property owners who may be affected by the proposed flood zones.  The maps may be viewed by clicking on the links below:

Draft Puna Flood Study FIRMs (Use the Index Map to locate individual FIRM panel numbers):  

LocationMapIndexMap , 94394496311201135114011411143

1144, 11511152115311541156,11571158115911611162

11631164116611671168116911761180136013801385,

1390139514051410Puna Hydrology and Hydraulic Report

 

 The Waiakea Flood Study in Hilo includes Waiakea Stream and Upper Palai Streams, and extends from the Kupulau Ditch, above Kupulau Road, down to the Puainako extension.  It was submitted to FEMA in March, 2015 and is awaiting adoption.  The draft workmaps can be viewed in the County of Hawaii Department of Public Works Engineering Division office in Hilo at 101 Pauahi St., suite 7, or by clicking on the links below:

Waiakea Stream and Upper Palai Streams Maps: 

map1, map2, map3

 

The Puukapu Flood Study in Waimea affects areas both sides of the Mamalahoa Highway in an approximately 2-mile radius from town.  It is unusual in that it has been approved by FEMA, but not formally adopted.  It will appear on the preliminary Digital Flood Insurance Rate Maps (DFIRMs) to be issued August 14, 2015.  From that date onward it can be viewed at http://gis.hawaiinfip.org/fhat

 

The North Kona Flood Study, like the Pu‘ukapu Flood Study, has been approved by FEMA, but awaits its addition to the DFIRMs for formal adoption.  The study re-maps the Waiaha and Holualoa Drainageways and adds additional breakout “split-flow” streams to the map.  It will also appear on the preliminary DFIRM August 14, 2015 and can be viewed at:

http://gis.hawaiinfip.org/fhat

 

The Keopu-Hienaloli Flood Study in North Kona maps almost 4 miles of these two streams that empty into Kailua Bay.  The study is scheduled to be submitted to FEMA this Fall.  On July 31, 2015 the County began using it to regulate development.  The draft map panels can be viewed by clicking on the links below:

Panel 711   Panel 712  Panel 713  Panel 714

 

The 2nd phase of the South Kona Flood Study is comprised of Water Courses 1 through 12, 21 through 25 and Captain Cook Water Course 1.  This study will appear on the preliminary DFIRM issued on August 14, 2015 and can be viewed at:

http://gis.hawaiinfip.org/fhat

If you have any questions regarding the draft or effective FIRMs please contact Carter Romero of the Hawaii County Department of Public Works Engineering Division at (808) 961-8943 or carter.romero@hawaiicounty.gov.