Our knowledgeable city staff can help you understand your flood hazard. We have historic data, maps, and real-time gauges to help you make decisions. On March 25, 2019, the City of Clive hosted a meeting to provide residents with information on flood risk, preparing for a flood, and what to do during a flooding event. Access the presentation materials here.
To aid in Flood Response Planning, the City worked with a local engineering firm to determine potential flood risks throughout the community based on the level of Walnut Creek and North Walnut Creek. Below is an interactive map that displays the potential flood inundation for areas of Clive and the City's response to those flood levels. You can turn different intensity events on and off by expanding the arrow next to Flood Inundation & Closures and checking the box next to the event intensity. The map also includes an interactive legend under the Legend tab, but an additional static legend is shown below describing the icons and colors shown on each of the inundation levels.
Flood Inundation & Closures Map Legend
Walnut Creek inundation maps are based on the creek level at the Interstate 35/80 gauge. Current information from this gauge can be viewed through the National Weather Service. According to the National Weather Service, the record crest for Walnut Creek was 13.4 Feet in June 2015. North Walnut Creek inundation maps are based on the creek level at Hickman Road/US 6 gauge just west of NW 80th Place. An interactive map for this gauge can be viewed through the Iowa Flood Center. On the Iowa Flood Center's interactive map, zoom into the Hickman Road and NW 80th Place area, then hover over the satellite icon on the right and click the box next to Stream Gauges; now you can click on the stream gauge for additional information. To receive emergency notifications during flooding events, sign up for Code Red.
REAL TIME INFORMATION
Stream Gauge information can be viewed through the National Weather Service. Select a stream gauge near your property to assess your flood risk.
The Iowa Flood Center provides flood alerts on their website through the Iowa Flood Information System and through Twitter. Iowa Flood Center publishes useful maps to help you understand where water flows in and out of the watershed, water depths, and which sensors are detecting levels of alarm. Four gauges located in Clive are included, and an instructional video is available on the homepage.
Clive utilizes Code Red to push emergency alerts to residents and property owners. Register online today to stay informed.
An Automated Flood Warning System is utilized for Walnut Creek and North Walnut Creek. The system of telemetered rain gauges, river gauges, and receivers is operated jointly by National Weather Service and the City of Des Moines in partnership with Clive, Urbandale, and West Des Moines. The system provides constant real time access to flooding threats along Walnut Creek and North Walnut Creek. The automated system provides alert information to key city personnel based on pre-defined threat levels as identified in the City’s Flood Response and Recovery Plan. Based on the USGS gauge at I-35/80, the NWS provides predictive information regarding anticipated timing and crest.
FEMA REGULATORY FLOOD MAPS
FEMA provides FIRMs (Flood Insurance Rate Maps) that show areas with a 1% or greater chance for flooding in any given year. Areas identified on the maps are called Special Flood Hazard Areas (SFHAs). The updated FIRM for Clive became effective February 1, 2019. FIRMs help promote public safety, and assist residents and professionals in making decisions about where and how new structures could be responsibly built. In addition to the interactive FIRM, PDFs for individual map panels are included below.
If you believe your property has been inaccurately included in the SFHA, contact Community Development to discuss the process for amending the flood map through a Letter of Map Change (LOMC) or visit FEMA online for additional information. Although FEMA uses the most accurate flood hazard information available, limitations of scale or accuracy of topographic information used to prepare the FIRM may cause small areas that are at or above the flood elevation to be inadvertently shown within the SFHA boundaries. Also, the placement of fill may elevate small areas within the SFHA boundaries to an elevation at or above the flood elevation. When this happens, structures or parcels of land may be inadvertently included in the SFHA on the FIRM.
Historic photographs and maps are publicly available through the Community Development Department to educate residents and property owners about flood hazards and risks. To learn about historic events that shape today's perspective, visit 2014 Flood Risk Report - Polk County.
In addition to understanding past flood events, it is important to keep up on changing risks. Clive partnered with Polk County and other jurisdictions on completion of the 2019 update to the Polk County Multi-Jurisdictional Hazard Mitigation Plan. Visit Polk County Multi-Jurisdictional Hazard Mitigation Plan for additional information.
As part of the Community Rating System, the City of Clive is required to implement projects to mitigate potential risks due to natural and man-made disasters. By clicking here, you can review the progress made on the projects identified while participating in the development of the Polk County Multi-Jurisdictional Mitigation Plan.