PRESENTATION: Improving Flood Resiliency for the Yahara River

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PRESENTATION: Improving Flood Resiliency for the Yahara River

Improving Flood Resiliency for the Yahara River Chain of Lakes (RCL) Lake Mendota Lake Monona Lake Waubesa Lake Kegonsa Floodplain Flood Impacts Street John Reimer Dane County Land & Water Resources Wisconsin Lakes Partnership Convention April 10, 2019 Hydrology of the Yahara Lakes Rain Mendota Monona Infiltration Runoff Waubesa Kegonsa Urban Development 2018 2003 1993 1970 75,000 Acres 41,000 Acres In 2018 there is 2 times more area of development than 1970 Hydrology of the Yahara Lakes Rain Mendota Monona Infiltration Runoff Waubesa Kegonsa Hydrology of the Yahara Lakes Mendota Monona Infiltration Runoff Waubesa Kegonsa Hydraulics of the Yahara Lakes Sediment Accumulation Constriction Points Aquatic Plants Exchange Street 2005 ~2 ft 1981 Area Flow Slope Flow Friction Flow Hydrology Mendota Monona Infiltration Runoff Waubesa Flow Kegonsa Flow ~ fun(Area, Slope, 1/n, ) Recent Lake Levels and Flows 2011 2018 Precipitation 30” 50” 848.52 (10 inches > 100 year) 847.86 , NGVD29) ft (10 inches > 100 year) ( 845.75 Water Level Water (7 inches > 100 year) (cfs) Flow Integrated Observations & Models Flow Gage Lake Level Gage Mendota Monona Waubesa Kegonsa Integrated Observations & Models Flow Gage Lake Level Gage Mendota Monona Lake-River Model Waubesa Hydrology Kegonsa Integrated Nowcast/Forecast Operation System for Yahara Waters Observations Integration Models Hydrology (Runoff) Hydraulics (River/Lake) USGS Gauges Wireless Buoys AOSS INFOS Gauges Web Cam www.infosyahara.org Scenarios Flood Risk Reimer and Wu, 2016 Loss $ 10 Day, 250 RP Mendota Building Risk Building Monona (USD Thousands) 10 Day, 10 RP Waubesa Kegonsa Return Period Are we prepared for tomorrow’s flood? Flood Forecasts Integrated Models Starkweather Creek Unit Hydrograph Past Rainfall 700 600 500 400 Watershed 300 200 Discharge (cfs) Discharge 100 June 16-23, 2014 0 0 5 10 15 20 25 Time (hr) Lake-River www.infosyahara.org Forecast Rainfall Flood Warning Lake Mendota Lake Monona Lake Waubesa Lake Kegonsa Science Driven Lake Level Management • Characterize Flood Risk LOSS RISK COMMER Procedure Building Building Mendota 500 Year 250 VulnerabilityMonona Mitigation500 10 Waubesa 500 250 Kegonsa 500 Mixed • Develop Flood Forecast and Warning Preparedness New Development: Improve Flood Resiliency ➢ Reduce the Number of Flood Disasters ➢ If Flood Disaster, Recover Quickly Approach Feb 1, 2019 Mar 18, 2019 Technical Work Group Policy Task Force Scenarios Adaptation a. Lower Lake Mendota one foot (flood storage or maintain lower) b. Safely Manage Lake Mendota at 100 year water level c. Remove all dams from the Yahara Lakes Mitigation a. Bridge Modifications b. Yahara River Dredging c. Flow Reroute and Pumping d. Combined (b) and (c) https://lwrd.countyofdane.com/Yahara-Chain-of-Lakes-Lake-Levels-Task-Force Adaptation – Lower Lake Mendota Flood Storage or Maintain Lower -2” -2” -2” -0.5” Mitigation – Yahara River Dredging 847.2 -6” 846.0 -12” -11” Cross Section -7” Thank You Vulnerability Mitigation Flood Risk Flood Forecast Preparedness Flood Resiliency Technical Policy Work Group Task Force.

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