flood maps – modeling a levee break

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Page 1: Flood maps – Modeling a levee break
Page 2: Flood maps – Modeling a levee break
Page 3: Flood maps – Modeling a levee break
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Flood maps – Modeling a levee break

http://www.msa.saccounty.net/waterresources/stormready/default.asp

Page 13: Flood maps – Modeling a levee break

Flooding• Urban flooding

– Paved areas and storm sewers increase runoff by inhibiting infiltration

– Rapid delivery of water to streams increases peak discharge and hastens occurrence of flood

• Flash floods– Local, sudden floods of large

volume and short duration– Typically triggered by heavy

thunderstorms

Page 14: Flood maps – Modeling a levee break

Flooding• Flood control– Dams designed to trap flood

waters in reservoirs upstream and release it gradually over time

– Artificial levees designed to increase capacity of river channel

• Works well until stream overtops artificially raised levees, leading to extremely rapid flooding and erosion

– Wise land-use planning, including prevention of building within 100-year floodplains, is most effective

Page 15: Flood maps – Modeling a levee break

Real-time river data

http://cdec.water.ca.gov/river/rivcond.html

http://cdec.water.ca.gov/river/americanStages.html