Flood Response Protocol

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June 25th Flooding 122 78th Street 5

 

CITY OF CLIVE FLOOD RESPONSE PROTOCOL - WALNUT CREEK AND NORTH WALNUT CREEK

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Flood Watch Assigned Responsibilities

Emergency Operations Center - Not activated

City Manager - Reviews weather information with Public Works

Public Works - Monitors the creeks and weather conditions; notifies City Management Team if flooding appears likely

Parks - Close bike trail gates if I-35 when creek depth reaches 5.0 feet

Police - Routine patrol and notify Public Works and City Manager if concern develops regarding possible flooding

Fire - No action

Community Development - No action

Administration & Library - No action

Flood Warning Level 1 (predicted crest level < 12.5 ft at I-35/80 Gauge)

Emergency Operations Center - Not activated

City Manager – City Management team meets as directed by City Manager; Assistant City Manager to handle media inquiries and any necessary Code Red notifications

Public Works – Barricade streets as needed; monitor North Walnut Creek; baskets and sand staged for possible deployment

Parks – Assist Public Works with barricading of streets and monitoring of the creeks

Police – Patrol barricaded areas; patrol for emergent problems such as stranded motorists; assign person to video and photo document flooding

Fire – Coordinate notifications to residents and businesses as necessary; notify Emergency Management agencies as necessary

Community Development & Tech Services – Staff available for GIS assistance; document flooding for future GIS purposes

Administration & Library – Document weather, water level, and actions taken chronology; notify elected officials as necessary; coordinate sustenance needs

Flood Warning Level 2 (predicted crest level > 12.5 ft at I-35/80 Gauge)

Emergency Operations Center – Activated at City Hall

City Manager – City Management team to meet hourly; Assistant City Manager in for answering media inquiries & Code Red notifications; consult with Mayor and coordinate any Mayoral disaster declaration

Public Works – Barricade streets as needed; monitor North Walnut Creek; implement placement of baskets at southern driveway locations along University Blvd at levels defined in the Flood Response Plan.

Parks – Assist Public Works with barricading of streets and monitoring of the creeks; facilitate shelters and transportation for residents as needed

Police – Patrol barricaded areas; patrol for emergent problems such as stranded motorists; assign person to video and photo document flooding

Fire – Coordinate notifications to residents and businesses as necessary; notify Emergency Management agencies as necessary; facilitate rescues as necessary

Community Development & Tech Services – Staff available for GIS assistance; document flooding for future GIS purposes; damage assessment

Administration & Library – Document weather, water levels, and actions taken chronology; notify elected officials as necessary; coordinate sustenance needs; library staff to coordinate volunteers and resource/donations management; administration to coordinate finance and documentation of activities

Inundation levels

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 a series of links to mapping documents that display the potential flood inundation for areas of Clive and the City's response to those flood levels.  A legend is shown below describing the icons and colors shown on each of the inundation maps.   

Flood Legend

Inundation Maps - Walnut Creek at I-35/80 Gauge

For Walnut Creek, the inundation maps are based on the creek level at the Interstate 35/80 gauge (click HERE for a link to the National Weather Service website for this gauge). According to the National Weather Service, the record crest for Walnut Creek was 13.4 Feet in June 2015.

4T Area - 10.9 Feet
7T Area - 12.6 Feet
10T Area - 13.9 Feet
20T Area - 16.7 Feet
 5T Area - 11.5 Feet
 8T Area - 13.1 Feet
 12T Area - 14.6 Feet
 24T Area - 17.6 Feet
 6T Area - 12.1 Feet
 9T Area - 13.5 Feet
 15T Area - 15.5 Feet
 

 

Inundation Maps - North Walnut Creek at Hickman Gauge

For North Walnut Creek the inundation maps are based on the creek level at Hickman Road/US 6 (available on the Iowa Flood Center website HERE).

10% Chance - 9.85 Feet
2% Chance - 11.61 Feet
0.2% Chance - 13.82 Feet
 4% Chance - 10.84 Feet
 1% Chance - 12.38 Feet
 

June 25th Flooding 120Drake Street 3

 

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