Wichita flood and freeze guide
Why Wichita built an 18-mile ditch around itself, what floods anyway, how to look up your flood zone, and what a long Kansas freeze does to household pipes. Every fact is sourced.
Referral service, not a contractor. A callback request is passed to an independent local restoration company. We do not perform the extraction, drying or repairs ourselves.
A city built on a floodplain
Wichita grew up where the Little Arkansas River meets the Arkansas, and for its first eighty years the rivers regularly came into town. Sedgwick County's water and stormwater fact sheet records the largest flood on the Lower Arkansas as May 18, 1877, when the river at Wichita reached 21 feet, nine feet above flood stage. On July 8, 1904, flooding submerged roughly 30% of the city's land area.
At the ceremony renaming the floodway, Rep. Ron Estes recalled that 600 city blocks were under water in 1923, according to KWCH's coverage. The 1944 flood left about 5,000 people temporarily homeless. That flood finally moved the region to act.
The county's list of significant twentieth-century floods also includes 1945, 1951, 1957, 1962, 1979, 1993 and 1998, and it notes a 2008 flood that caused millions in property damage.
The Big Ditch, in numbers
The Wichita-Valley Center Flood Control Project diverts the Arkansas River, the Little Arkansas and Chisholm Creek around central Wichita and returns the water to the Arkansas downstream, near Derby, after passing Haysville. Farmers who were losing land to it coined the nickname "Big Ditch" as an insult. The name outlasted the opposition.
Wichita State University historian David Guilliams' article in the Fairmount Folio gives the scale: an 18-mile floodway, 50 miles of connecting channels, 100 miles of levees and 150 control structures, built by the Army Corps of Engineers between 1950 and 1959 for $20 million. By 1975, he writes, it had prevented an estimated $33 million in flood damage.
The county fact sheet says the City and County together spend about $1.9 million a year to maintain it. In 2019 the channel was officially renamed the MS Mitch Mitchell Floodway, after the engineer who championed it.
What still floods: the Halloween Flood of 1998
The Big Ditch handled the rivers. The creeks were another story.
Starting the evening of October 30, 1998, a long weekend of rain dropped up to 11 inches across central and southeast Kansas. The NWS Wichita office's retrospective by service hydrologist Janet Spurgeon lists record crests on the Whitewater, Cottonwood, Walnut and Arkansas rivers. Weather-lab gauges recorded 12.66 inches at Wichita's Brooks Middle School and 12.30 inches at Valley Center West Elementary.
Inside Wichita, the damage came from Cowskin Creek on the west side. It flooded to a record level that nobody measured at the time, because the creek had no gauge. About 100 people were evacuated, and the NWS put Sedgwick County's Cowskin Creek damage to homes, businesses, roads and crops at $4 million.
What changed afterward: the USGS and the City installed real-time stage and rain gauges along Cowskin Creek, and the NWS created a river forecast point at 119th Street West with a flood stage of 18 feet. The creek reached an estimated 22 feet there in 1998. If you live near the Cowskin, a flood warning for that gauge is your cue to move belongings up. Butler County had it worse that weekend, and the Augusta page tells how the Whitewater topped that city's levee.
Lesson for homeowners
Living inside a flood-control system is not the same as living outside a flood zone. Small creeks and overwhelmed storm drains can still put water in basements and low homes, and that water is contaminated. The storm and flood damage page covers cleanup safety.
Look up your own flood risk
- FEMA Flood Map Service Center (msc.fema.gov). Search by address and make a FIRMette, a printable section of the official Flood Insurance Rate Map. Valley Center's floodplain page walks through the steps.
- Sedgwick County GIS (gismaps.sedgwickcounty.org/portal). Turn on the "Land Features" and "Flood Plain" layers. Valley Center points residents here for the current countywide maps.
- City of Wichita GIS. Wichita publishes a FEMA flood layer with base flood elevations, cross sections, floodway and flood zones.
- Ask a person. For unincorporated Sedgwick County, MABCD says to contact its floodplain technician at 316-660-1840.
Inside Wichita, the City has its own floodplain rules for repairing homes that were badly damaged in a mapped flood area. If your repair is a big one, ask the City what applies before you sign a rebuild contract, because the answer can change the scope of the job.
Rain, creeks and roads
Flash flooding moves faster than river flooding. Valley Center's city guidance says 2 to 4 inches of rain in 3 to 4 hours is enough to threaten the banks of its local floodways, while the Little Arkansas rises more slowly from rain to the north and west.
The NWS's rule for roads is short: six inches of fast water can knock an adult down, and 18 to 24 inches can float a car. Turn around.
Insurance note: the Kansas Insurance Department reminded Kansans in 2023 that not every homeowners policy covers water damage, back-up due to flooding, sump pump failure or additional living expenses. Flood coverage is a separate policy with a 30-day wait, according to the Derby and Valley Center flood pages.
Freezes and the pipes inside your walls
The NWS Wichita office's summary of February 2021 describes an Arctic air mass that sat over the Plains from February 6 to 18, the most persistent since the 1980s. Some days the high temperature stayed in the single digits. Wichita stayed below freezing for 12 consecutive days and below 20 degrees for nine. It kept at least an inch of snow on the ground for 13 days, the longest stretch since 1993.
Long, deep cold is what bursts household pipes: supply lines in exterior walls, plumbing over unheated garages and crawlspaces, outdoor faucets with hoses still attached. The burst pipe page covers shutoffs and prevention.
The public water system
Wichita's water distribution system serves nearly 500,000 people across the region, the City said in 2023, and the Hess Pump Station pushes water out mainly through large-diameter transmission pipes. In fall 2021, a 42-inch main near I-135 and K-96 broke, and the city went under a boil water advisory. The City traced it to prestressed concrete cylinder pipe: of its 96 miles of that pipe, 28 miles were made by Interpace during an era of pipe the City says has shown significant failures across the country.
The Associated Press reported that the break followed a power loss at the treatment plant. The public works director said the rapid drop and return of pressure is "not friendly to pipes, especially older pipes." The same report cited a 2017 assessment, reported by The Wichita Eagle, that found 99% of the treatment plant in poor condition. In October 2023 the City Council voted 7-0 to fund water and sewer main improvements, including $4 million to assess water lines.
For a homeowner, the practical lesson is narrow: a break in the street is the City's to fix, and a break on your side of the meter is yours. Know your main valve, and report street breaks to the utility. Sewer lines have a similar public and private split, explained on the sewer backup page.
| Need | Wichita-area number |
|---|---|
| Wichita emergency water leaks and sewer stoppages | (316) 262-6000 (the City lists weekday hours) |
| Wichita water customer service and billing | (316) 265-1300 |
| Gas leak or gas smell | Leave; call 911 and Kansas Gas Service 888-482-4950 |
| Floodplain questions, unincorporated Sedgwick County | MABCD 316-660-1840 |
| Insurance complaints and claim questions | Kansas Insurance Department 785-296-3071 |
| Contractor or door-to-door sales complaints | Kansas Attorney General 1-800-432-2310 |
Local questions
Does the Big Ditch mean my Wichita home can't flood?
No. It protects central Wichita from large river floods. The 1998 Cowskin Creek flood showed that creeks, storm drains and heavy rain can still flood homes, and burst pipes and sewer backups have nothing to do with rivers at all.
Where can I check river and creek levels?
The NWS Wichita office issues flood warnings for forecast points, including Cowskin Creek at 119th Street West. The USGS also runs real-time gauges, such as the Little Arkansas River gauge at Valley Center's Main Street bridge.
What should I do during a boil water advisory after a main break?
Follow the City's notice first. The CDC's general advice is to bring water to a full rolling boil for one minute, and to use bottled or boiled water for drinking, preparing food and brushing teeth. Skip the water and ice dispensers on your refrigerator. Washing hands with tap water and soap is often fine, the CDC says. Wichita's 2021 main break led to exactly this kind of advisory.
Who maintains the floodway?
The City of Wichita and Sedgwick County maintain the Wichita-Valley Center Flood Control Project, at a cost of about $1.9 million a year according to the county fact sheet.