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4.7 Floodway Delineation The floodway is that portion of the available flow cross section that cannot be obstructed without causing an increase in the water-surface elevations resulting from a flood with a 100year average return period of more than a given amount. Another type of problem in the determination of a floodway is that the concept of a floodway, at least as implemented in practice, is unequivocally a steady-flow concept. Thus, the floodway specification consists of a table, with one line in the table used for each cross section to be modified, giving (1) a description of the method to apply in defining the floodway and (2) key items of information required to implement that method. il.water.usgs.gov /proj/feq/fequtl/fequtl.chap4_9.html   (1851 words)

Flood Terminology For NFIP purposes, floodways are defined as the channel of a river or stream, and the overbank areas adjacent to the channel. The floodway carries the bulk of the floodwater downstream and is usually the area where water velocities and forces are the greatest. The NFIP floodway definition is "the channel of a river or other watercourse and adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one foot. www.lanecounty.org /Planning/Flood_Info/Flood_Terms.htm   (487 words)

The Floodway Expansion Project Description The existing Floodway is a flood diversion channel that was constructed between 1962 and 1968 as a major element of a coordinated flood-defence response to massive damage incurred by the City of Winnipeg during the 1950 flood. Construct a “twin” floodway adjacent to the existing channel to increase the discharge capacity of the diversion. While the current Floodway configuration provides protection to the City of Winnipeg from floods with a 1 in 90 years probability of reoccurrence, this level of protection was determined to be barely adequate for a larger magnitude flood such as the Flood of 1997, which was a 1 in 100 year flood event. www.floodwayeia.com /projdesc.htm   (3704 words)

FEMA: Floodway A "Regulatory Floodway" means the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than a designated height. Communities must regulate development in these floodways to ensure that there are no increases in upstream flood elevations. For streams and other watercourses where FEMA has provided Base Flood Elevations (BFEs), but no floodway has been designated, the community must review floodplain development on a case-by-case basis to ensure that increases in water surface elevations do not occur, or identify the need to adopt a floodway if adequate information is available. www.fema.gov /plan/prevent/floodplain/nfipkeywords/floodway.shtm   (162 words)

Manitoba History: “Duff’s Ditch”: The Origins, Construction, and Impact of the Red River Floodway The floodway channel carries floodwaters past the city and, in supplementing the flow capacity of the Red River channel at Winnipeg, precludes spring flood waters from rising to a height sufficient to overflow the river dikes and flood much of the city, including the central business district. Although the floodway would pass through farm lands to the east of Winnipeg, rather than through more densely populated urban areas, nonetheless, hundreds of properties still had to be expropriated in whole or in part for its construction. For most of the floodway route the soil was a highly plastic lacustrine clay underlain by glacial till, with the exception of one section of high ground at Bird’s Hill ridge, which consisted of a granular fluvio-glacial deposit. www.mhs.mb.ca /docs/mb_history/42/duffsditch.shtml   (8241 words)

Melbourne Water LDM : Appendices : Appendix A The design floodway flow for the recommended safety limits shall normally be the 100 year ARI peak flow, less the effective capacity of any related underground system. The following limits apply to floodway crossings of any road which effectively exists as an embankment control relative to the levels of the downstream floodway but which is not specifically designated as a floodway crossing and fitted with appropriate signage and flood depth boards. For any road crossed by a floodway, the use of other design measures should be encouraged to control approach speed and/or to alert the driver to possible changing conditions. ldm.melbournewater.com.au /content/appendices/appendix_a.asp   (1512 words)

Flood Plain Regulations Floodway is that area designated for passage of the water of the 100-year but not located in the Flood-Fringe district. The delineation of the floodway is based upon the principle that said area is identified to carry the waters of the 100-year flood, without increasing the water surface elevation more than [1] foot at any point. The Floodway and Flood-Fringe Districts shall be overlays to the existing underlying districts as shown on the Official Zoning Ordinance Map, and as such, the provisions for these two [2] districts shall serve as a supplement to the underlying district provisions. www.somersetborough.com /zone/FloodPlainRegs.htm   (1564 words)

Neebing-McIntyre Floodway The Neebing-McIntyre (N/M) Floodway is a large channel extending from the Neebing River at Ford Street and Parkway Drive to the McIntyre River just east of the William Street bridge. To promote the recreation potential of the Neebing-McIntyre Floodway, the LRCA and the City of Thunder Bay Parks and Recreation Department have constructed over five kilometres of pathways which link to the 28 km network of recreation pathways in the City. A recent addition to the Floodway is the Blake Memorial Grove. www.lakeheadca.com /floodway.htm   (922 words)

Prime Minister Chrétien and Premier Doer announce $160 million for the Red River Floodway expansion Work on the entire expanded floodway project is expected to generate hundreds of millions of dollars in economic benefits for the Province of Manitoba and for the rest of Canada. Today's joint investment in the Red River Floodway expansion is consistent with the objectives of the Government of Canada and provincial/territorial jurisdictions in the development of a National Disaster Mitigation Strategy which aims at reducing, through mitigation, the personal, social, economic and environmental impacts of disasters in Canada. The economic benefits of the total expansion of the Floodway for the Province of Manitoba and the rest of Canada are estimated to be in the hundreds of millions of dollars. www.infrastructure.gc.ca /ip-pi/csif-fcis/news-nouvelles/2003/20030403winnipeg_e.shtml   (2717 words)

Portage la Prairie, Manitoba - Wikipedia, the free encyclopedia Portage la Prairie is located approximately 70 kilometres (45 miles) west of Winnipeg. It sits on the Assiniboine River, which flooded the town persistently until a ditch north to Lake Manitoba (the Assiniboine River Floodway) was built to divert the flood waters. The name is derived from the french word "portage", which means to carry a canoe overland between waterways. en.wikipedia.org /wiki/Portage_la_Prairie,_Manitoba   (898 words)

Bob's Rock Shop: Gypsum Rosettes from Winnipeg's Red River Floodway The floodway has an average depth of 10 meters, and the width ranges from 130 to 180 meters at the base to 230 to 330 meters at the top of its banks. The rosettes are not found uniformly distributed throughout the banks of the floodway but occur in small "pods" of high concentration in certain areas of the floodway. The crystals are not restricted to the floodway, but it is one of the few structures that cut deep enough into the floodplain to intersect the clay zones. www.rockhounds.com /rockshop/floodway.html   (1316 words)

The Floodway Authority Act "floodway" means the Red River Floodway, consisting of land and structures set out in plans of survey listed in the regulations, including, but not limited to, the floodway control structure, floodway channel, floodway outlet structure and west dyke. 2(1) The Floodway Authority is hereby established as a corporation without share capital, consisting of the directors appointed by the Lieutenant Governor in Council under section 6. 6(1) The board of directors of the Floodway Authority is to consist of at least five members appointed by the Lieutenant Governor in Council. web2.gov.mb.ca /laws/statutes/2004/c02504e.php   (1201 words)

Floodway Keeping In Shape - 2000 The Neebing-McIntyre Floodway was the focus of a dredging operation in August 2000. Lakehead Conservation hired a contractor to perform the required maintenance dredging in the Floodway Channel to the west of Balmoral St. A large crane fitted with a clam-shell bucket excavated over 4000 cubic metres of sediment (enough to spread a metre-thick on a baseball diamond). The Floodway must be ready at all times to protect the Intercity area. www.lakeheadca.com /y00fldwy.htm   (207 words)

NRC: Commission Floodway Criteria First, a floodway may be designated using technical criteria designed to predict the areas inundated and carrying flood waters during a 100-year frequency storm. The floodway's width or the landslide limits so as to include parts of the flood plains adjoining the channel that, with the channel, are reasonably required to efficiently carry and discharge the flood waters or flood flow of the river or stream. All of the area within a commission floodway is the floodway for all purposes of this chapter. www.ai.org /nrc/2489.htm   (732 words)

St. John Bayou & New Madrid Floodway Memphis Corps of Engineers The purpose of the floodway is to lower flood stages upstream and adjacent to the floodway during major flood events. The Floodway is some 35 miles in length and varies from 4 to 12 miles in width. The primary features of the floodway are the setback (mainline) levee, which extends from Birds Point, Missouri, to New Madrid, Missouri, and the frontline levee which is located on the west bank of the river and generally follows its alignment. www.mvm.usace.army.mil /stjohns/Floodway   (658 words)

The Manitoba Floodway Authority Act 2(1) The Manitoba Floodway Authority is hereby established as a corporation without share capital, consisting of the directors appointed by the Lieutenant Governor in Council under section 6. 4 The Manitoba Floodway Authority is an agent of the Crown. 6(1) The board of directors of the Manitoba Floodway Authority is to consist of at least five members appointed by the Lieutenant Governor in Council. web2.gov.mb.ca /laws/statutes/ccsm/f133e.php   (1202 words)

Red River Rising: Manitoba Floods | CBC Archives The floodway is 47 kilometres long and almost as wide as the Red River itself. In 1959, he tabled a proposal at the legislature for the construction of the floodway. When the sections are raised, the channel is narrowed, forcing water to overflow into the floodway ditch. archives.cbc.ca /IDC-1-70-670-3785/disasters_tragedies/manitoba_floods/clip3   (730 words)

The Winnipeg Floodway It was estimated that another flood of the 1950 magnitude would cost the city $114 million 1958 dollars. Premier Duff Roblin succeeded in convincing the city to build a floodway around the city to protect it's low lying areas. In 1968 the floodway was in operation, and has been instrumental in saving the city on many occasions. www.winterpeg.com /Town/winnipeg-floodway.htm   (212 words)

Floodway Expansion The fact is that Premier Roblin did not have a PLA when building the floodway and we don’t need one now,” he said. Well, the reality is that Duff didn’t need a PLA to build the floodway, such an agreement is not acceptable to us, and by the public’s reaction so far – it’s definitely not acceptable to the majority of Manitobans either,” he said. For instance, the Hydro PLAs had to address the fact that numerous unionized trades were involved and since the work was in remote locations, they had to establish camp conditions for things such as food, accommodations, trips home and entertainment. www.manpc.mb.ca /Default.aspx?tabid=845   (466 words)

Province of Manitoba l Manitoba Floodway Authority Although the floodway saved Manitoba billions in damage that year, the public recognized the need to improve the flood protection level of the floodway. The new floodway is being designed to protect Winnipeg from a repeat of that 1826 flood. No deepening of the floodway channel – MFA has dramatically scaled back plans to deepen the floodway channel from initial estimates of up to two metres (six feet) to no deepening. www.floodwayauthority.mb.ca /faq.html   (1420 words)

Floodway - Wet & Dry The Floodway must be kept in good operational condition so that it is ready to avert flooding at all times. The water then enters the large Floodway Channel and is carried safely to Lake Superior. The excess flows carried by the Neebing-McIntyre Floodway would have caused flooding in the years before the Floodway was built. www.lakeheadca.com /03fldway.htm   (452 words)

20D.140.40 Frequently Flooded Areas. The portion of the floodplain outside of the floodway which is generally covered by flood waters during the base flood; it is generally associated with standing water rather than rapidly flowing water. If the zero-rise floodway has not yet been defined for the property in question, the applicant will be responsible for modeling the base flood elevation and delineating the extent of the zero-rise floodway, consistent with the assumptions in the Bear Creek Basin Plan as adopted by the City. Installations or structures that are floodway dependent may be located in the floodway; provided, that the development proposal receives approval from all other agencies with jurisdiction and meets all standards in RCDG 20D.140.20-040 and 20D.140.30-030. www.codepublishing.com /WA/redmond/CDG/cdg20D14040.html   (1997 words)

St. Johns Bayou & New Madrid Floodway Project Memphis Corps of Engineers Local farming interests have modified the Floodway over the last 100 years to become a viable agricultural area. The land use in both the Floodway and St. Johns Bayou Basin is mostly agricultural with the economy of the region based on agriculture. The floodway is not a vast region of marsh/swamp wetlands as has been represented by opponents of the project in past years. www.mvm.usace.army.mil /StJohns/overview/default.asp   (1251 words)

[No title] Colorado River Floodway -STATUTE- (a) Establishment There is established the Colorado River Floodway as identified and generally depicted on maps that are to be submitted by the Secretary. 901(d)(2), substituted "appropriate chief executive officers of States, counties, municipalities, water districts, Indian tribes, or equivalent jurisdictions in which the Floodway is located," for "the appropriate officers referred to in paragraph (3) of subsection (b) of this section,". Limitations on Federal expenditures affecting Floodway -STATUTE- (a) Except as provided in section 1600e of this title, no new expenditures or new financial assistance may be made available under authority of any Federal law for any purpose within the Floodway established under section 1600c of this title. uscode.house.gov /download/pls/43C32B.txt   (2452 words)

The City of Plano, Texas Official Website The existing creek or creeks traversing the Drainage and Floodway Easement will remain as an open channel at all times and shall be maintained by the individual owners of the lot or lots that are traversed by or adjacent to the Drainage and Floodway Easement. The natural drainage channels and creeks through the Drainage and Floodway Easement, as in the case of all natural channels, are subject to storm water overflow and natural bank erosion to an extent which cannot be definitely defined. The existing creek or creeks traversing the Drainage and Floodway Easement shall remain as open channels at all times and shall be maintained by all of the owners of lots in the subdivision by and through a lawfully created homeowners association to be created by the Owners. www.plano.gov /Departments/Planning/DevRev/standards.htm   (2252 words)

Floodway Expansion The same can happen with the floodway expansion project if the Premier frees himself of the union ties that bind him and takes forced unionization and forced union dues off the table. Wally Fox Decent, but he is not the one who is responsible for deciding if the floodway expansion project should have a labour agreement that forces non-unionized workers to pay union dues - and the Premier is sorely mistaken if he thinks he can absolve himself of blame by punting the issue to Mr. Murray added that the Premier could ensure there is no strike or lock out during the construction of the floodway expansion by simply including a clause in the project agreement that stipulates there is to be no strike or lock out. www.manpc.mb.ca /Default.aspx?tabid=904   (277 words)

Houston Flooding - Houston Floodway Property Rights & a $5 Billion Dollar Loss? With floodway and floodplain properties being affected by this October 1, 2006 passage by council and the Mayor, the general public, need to know that every property owner in the city is adversely affected by this damaging Ordinance. Properties in the floodway and floodplain (approximately 10,000 and 105,000 total) cannot get building permits to re-build more than 50% of the structure under different, but stringent rules, cumulative over a 10 year period based on the appraised value of the structure prior to the destruction. People with properties outside of the “floodway”, but adjacent to it, could be in the floodway next time and still be constricted by this Ordinance 19-43 as it stands especially because of some of its definitions. www.pressmediawire.com /article.cfm?articleID=18527   (2736 words)

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