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Topic: Floodplain


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  Floodplain - Wikipedia, the free encyclopedia
Floodplains are formed by the deposition of sediment carried by river as it floods.
Still, floodplains are most commonly found near the mouth of a large river, such as the Rhine, the Nile, or the Mississippi, where there are occasional floods and the river usually carries a large amount of sediment.
The floodplain during its formation is marked by meandering or anastomosing streams, ox-bow lakes and bayous, marshes or stagnant pools, and is occasionally completely covered with water.
en.wikipedia.org /wiki/Floodplain   (982 words)

  
 Community Involvement in Flood and Floodplain Management
However, Australian floodplain management practice is largely directed towards alleviating the damage potential of existing development at risk of flooding and to ensure that there is no growth in the potential for loss due to development inappropriately sited on flood-liable lands.
The Flood Authority is responsible for undertaking and supervising flood studies, for the preparation of flood maps, and for the delineation of floodway and flood fringe zones.
However, on a state-wide basis, floodplain management was characterized at the municipal level by a lack of standards and a lack of coordinated programmes.
www.unescap.org /esd/water/disaster/australia.htm   (5945 words)

  
 City of Austin - Floodplain Development Information for Developers and Engineers
Projects proposing development in the 25-year and 100-year floodplains have the potential for placing our citizens and their property at risk of flooding and producing changes in floodplain elevations and plan view extent.
Excavation and fill of the floodplain and modification of the channel are subject to requirements to preserve the natural and traditional character of the land and waterway.
Floodplain mapping that is outdated may create unnecessary encumbrances (such as federal requirements for flood insurance or building permit restrictions), or may allow citizens to be placed at undue risk of flooding.
www.ci.austin.tx.us /watershed/floodplaindev.htm   (1566 words)

  
 What Is A Floodplain?
By their very nature, floodplains are the low, flat, periodically flooded lands adjacent to rivers, lakes and oceans and subject to geomorphic (land-shaping) and hydrologic (water flow) processes.
As distinguished from the floodplain, a river' floodway is the dry zone typically between levees, which is designed to convey flood waters (making wonderful areas for bike trails and parkways because it is only periodically flooded).
For land use planning purposes, the regulatory floodplain is usually viewed as all lands within reach of a 100 year flood.
www.friendsoftheriver.org /Publications/BeyondFloodControl/no5.html   (867 words)

  
 DCR Floodplain Management Regulations   (Site not responding. Last check: 2007-10-10)
The flood-fringe is the portion of the floodplain outside of the floodway, which is covered by floodwater during the 100-year discharge.
It is also that part of the floodplain wherein development is subject to a community's floodplain ordinance.
Floodplain management means the operation of an overall program of corrective and preventive measures for reducing flood damage, including but not limited to emergency preparedness plans, flood control works and floodplain management regulations.
www.dcr.state.va.us /sw/fpregs.htm   (610 words)

  
 Floodplain Management - Flood Control District of Maricopa County   (Site not responding. Last check: 2007-10-10)
Floodplain delineation involves the development of detailed topographic maps to determine where water goes, while incorporating the results of rainfall-runoff relationship studies to determine peak flood discharges and depths.
The delineation studies are used by the District to better manage the floodplain, to reduce or prevent flood damage, and to maintain the natural and beneficial functions of the floodplains.
Floodplain representatives are on hand at the District to help residents determine whether or not their property is in a flood hazard area and to provide information.
www.fcd.maricopa.gov /Services/Floodpain.asp   (383 words)

  
 DEQ - Floodplain Management FAQs
The 100-year floodplain is the land adjacent to a river, lake or stream that will be inundated by water during a flood which has a 1% chance of occurring of being exceeded in any given year.
Floodways are the channel of a river or stream and those portions of the floodplain adjoining the channel which are reasonably required to carry and discharge the 100 year flood; these are areas of moving water during times of flood.
A state floodplain (Part 31) permit is not required for the construction of a house within the floodplain of a lake, provided the construction is not being proposed on the inlet or outlet of the lake.
www.michigan.gov /deq/0,1607,7-135-3313_3684_3725-11281--,00.html   (4372 words)

  
 WDFW - An Evaluation of Fish and Amphibian Use of Restored and Natural Floodplain Wetlands
In floodplains, restoration projects with water control structures are often intended to conserve and restore wetland habitat characteristics including floodplain function, hydrologic connectivity, and critical habitat for migratory wildlife and threatened and endangered semi-aquatic and aquatic wildlife and plant species.
In Carnation Creek watershed (a drainage in Vancouver, B.C.), a floodplain area of about 50 hectares in a given location, 15-25% of the total smolt yield were captured in off-channel sites, and most of those fish spent the winter in off-channels devoid of standing water during summer (Brown and Hartman 1988).
The Chehalis River floodplain has seasonal wetlands that have infrequent surface water connections to the river, are temporarily flooded for brief periods, and are primarily rain-fed.
wdfw.wa.gov /fish/papers/floodplain_wetlands   (1280 words)

  
 ASFPM CERTIFIED FLOODPLAIN MANAGER PROGRAM
The role of the nation’s floodplain managers is expanding due to increases in disaster losses, the emphasis being placed upon mitigation to alleviate the cycle of damage-rebuild-damage, and a recognized need for professionals to adequately address these issues.
A. ASFPM Certified Floodplain Manager (CFM) This certification is awarded by the ASFPM directly to individuals who apply and successfully pass the exam, demonstrating their knowledge of the basic national standards and programs of floodplain management, but who reside or work in states where ASFPM accredited certification is not available.
The initial ASFPM Certified Floodplain Manager certification will be awarded upon the successful completion of three steps: (1) submitting completed application and fee: (2) submitting an employment Verification form: and (3) receiving a grade of 70% or higher on the certification exam.
www.floods.org /Certification/certprog.asp   (2187 words)

  
 Shoreland management guide - Floodplain management: Minnesota DNR
Under state law, the floodplain is considered to be the land adjoining lakes and rivers that is covered by the "100-year" or "regional" flood.
Under the statewide floodplain management standards, local communities cannot allow development in the floodplain that would cumulatively cause more than a 1/2 foot (6 inches) increase in the height of the 100-year flood.
The Flood Fringe is the remainder of the floodplain lying outside of the floodway.
www.dnr.state.mn.us /shorelandmgmt/guide/floodplain.html   (954 words)

  
 FLOODPLAINS
Floodplains are nature's method of disaster damage control.
Floodplains are special parts of the valley where rising waters can flood.
However, in the past, planners did not recognize the power of water and the danger of the floodplain.
web.mit.edu /wplp/course/f98stud/bw/fmfloopl.htm   (203 words)

  
 Learning Center
A "floodplain" is the lowland adjacent to a river, lake or ocean.
Floodplains are designated by the frequency of the flood that is large enough to cover them.
For example, the 10-year floodplain will be covered by the 10-year flood and the 100-year floodplain by the 100-year flood.
www.floodplain.org /flood_basics.htm   (1322 words)

  
 FEMA: The National Flood Insurance Program
Floodplain management is the operation of a community program of corrective and preventative measures for reducing flood damage.
To encourage communities to establish sound floodplain management programs that recognizes and encourages community floodplain management activities that exceed the minimum NFIP requirements the Community Rating System (CRS) was created.
Additional floodplain management resources are available to download or can be ordered from the FEMA Publication Distribution Center by calling 1-800-480-2520 and requesting the publication by its FEMA number.
www.fema.gov /plan/prevent/floodplain/index.shtm   (316 words)

  
 Sherburne County Planning and Zoning Department - Floodplains and Flood Insurance
The goal of the floodplain ordinance is to minimize the threat to life and property resulting from flooding.
The regulatory floodplain is the area covered by a flood that has a 1% chance of occurring in any given year, often referred to as the 100-year flood.
The related floodway, flood fringe and general floodplain are portrayed as shaded areas on the FIRM maps.
www.co.sherburne.mn.us /zoning/environ/floodplain.htm   (1297 words)

  
 DEQ - Floodplains   (Site not responding. Last check: 2007-10-10)
The State of Michigan’s Floodplain Regulatory Authority, found in Part 31, Water Resources Protection, of the Natural Resources and Environmental Protection Act (NREPA), 1994 PA 451, as amended, requires that a permit be obtained prior to any alteration or occupation of the 100-year floodplain of a river, stream or drain.
The floodplain is divided into two parts, the floodway which carries most of the flow during a flood event, and the floodway fringe which is an area of very slow moving water or “slack water”.
Floodways are the channel of a river or stream and those portions of the floodplain adjoining the channel which are reasonably required to carry and discharge the 100 year flood; these are high hazard areas of rapidly moving water during times of flood.
www.michigan.gov /deq/0,1607,7-135-3313_3684_3725-11255--,00.html   (571 words)

  
 Forest:Present:Floodplain
The floodplain is shaped and reshaped by the meandering (shifting of stream course from side to side) of streams and rivers.
Portions of a floodplain closest to the stream or river can remain submerged during periods from one week to as long as two months.
Floodplain plants have a variety of adaptive strategies to cope with the seasonal flooding.
www.museum.state.il.us /muslink/forest/htmls/pr_flood.html   (639 words)

  
 KDA - DWR - Floodplain Management Page   (Site not responding. Last check: 2007-10-10)
Floodplain zoning - Kansas statutes passed in 1970 gave cities and counties zoning authority to help reduce floodplain problems.
For floodplain management, incorporated cities and unincorporated areas of counties are separate entities that must separately enact and enforce floodplain management regulations.
Kansas statute relating to floodplain zoning (K.S.A.), implementing regulations (K.A.R. 5-44-1 to 6), and glossary of terms and acronyms relating to floodplain management.
www.accesskansas.org /kda/dwr/WS/Floodplain_management.htm   (431 words)

  
 EWP Floodplain Easement Facts | NRCS
Floodplain easements restore, protect, maintain, and enhance the functions of the floodplain; conserve natural values including fish and wildlife habitat, water quality, flood water retention, ground water recharge, and open space; reduce long-term federal disaster assistance; and safeguard lives and property from floods, drought, and the products of erosion.
Under the floodplain easement option, a landowner voluntarily offers to sell to the NRCS a permanent conservation easement that provides the NRCS with the full authority to restore and enhance the floodplain’s functions and values.
To the extent practicable, NRCS actively restores the natural features and characteristics of the floodplain through re-creating the topographic diversity, increasing the duration of inundation and saturation, and providing for the re-establishment of native vegetation.
www.nrcs.usda.gov /programs/Floodplain/index.html   (554 words)

  
 EPA NE: GE/Housatonic River Site - Floodplain Properties
These floodplain areas have been identified using historic information concerning flood conditions along the river and hydraulic models of the river floodplain showing where PCB concentrations in soil are predicted to equal 1 ppm.
Floodplain Current Residential Properties Adjacent to 1½-Mile Reach- Actual/Potential Lawns -The 1½-Mile Reach is defined by the Lyman Street bridge (upstream) and the confluence with the West Branch (downstream) (Figure 1-2 of the SOW).
The Floodplain Properties do not include river sediments and riverbank soils, as well as other floodplain soils downstream of the confluence (i.e., non-residential areas and residential areas that are not Actual/Potential Lawns).
www.epa.gov /region1/ge/thesite/floodplain.html   (517 words)

  
 FEMA Floodplain Information
A floodplain is an area that will be inundated by a flood from a river, creek, ditch, lake, or other source of flooding.
A 100-year floodplain is the area that will be inundated by the 100-year flood.
The current FIRM designates the official FEMA floodplain boundary for insurance purposes, but changes may be made to it in the future.
www.opkansas.org /_Bus/Engineering_Services/floodplain.cfm   (636 words)

  
 Floodplain Management
For regulatory purposes, the floodplain is divided into two areas based on water velocity: the floodway and the flood fringe.
Due to the high degree of hazard, most floodplain regulations require that proposed floodway developments do not block the free flow of flood water as this could dangerously increase that water's depth and velocity.
Therefore, floodplain regulations for the flood fringe typically allow development to occur but require protection from the flood waters through the elevation of the buildings above the 100-year flood level, floodproofing buildings so that water cannot enter the structure and watershed improvements to assure overall flood elevation does not increase.
www.msdlouky.org /programs/crssite/fpmanreg.html   (823 words)

  
 CPD - Energy and Environment - Environment - Compliance - Questions and Answers - Floodplain Management - HUD   (Site not responding. Last check: 2007-10-10)
The purpose of Executive Order 11988 - Floodplain Management is "to avoid to the extent possible the long and short term adverse impacts associated with the occupancy and modification of floodplains and to avoid direct or indirect support of floodplain development wherever there is a practicable alternative."
The floodplain designated by FEMA as the Special Flood Hazard Area (SFHA) is represented on the flood map by darkly shaded areas designated with the letter "A" or "V." FEMA uses engineering studies to determine the delineation of these areas or zones subject to flooding.
The critical action standard applies to the proposed use of HUD assistance to structures or facilities located within the 500-year floodplain, when the structures or facilities are likely to contain occupants who may not be sufficiently mobile to avoid loss of life or injury during flood or storm events.
www.hud.gov /offices/cpd/energyenviron/environment/compliance/qa/floodplainmgmt.cfm   (914 words)

  
 Floodplain Ordinance
It is the intent of the City of Eastport, Maine to require the recognition and evaluation of flood hazards in all official actions relating to land use in the floodplain areas having special flood hazards.
Area of Special Flood Hazard - means the land in the floodplain having a one percent or greater chance of flooding in any given year, as specifically identified in the Flood Insurance Study cited in Article I of this Ordinance.
For floodplain management purposes the term manufactured home also includes park trailers, travel trailers, and other similar vehicles placed on a site for greater than 180 consecutive days.
www.eastport-me.gov /Public_Documents/EastportME_WebDocs/floodplainord   (6775 words)

  
 Floodplain Maps   (Site not responding. Last check: 2007-10-10)
Floodplain maps for Pima County are now available on-line using Autodesk's free MapGuide viewer software.
Please note that if your parcel is located within one of three other floodplain jurisdictions that administer FEMA floodplains within Pima County (white areas on the maps), you should contact the appropriate agency for further information.
Due to the dynamic nature of the floodplains and potential limitations of the GIS information shown on these maps, it's important to understand the limitations of this information and how it should be used: read the disclaimer.
rfcd.pima.gov /fpm/fpmaps   (329 words)

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