Flood Mitigation and Water Quality Iowa Department of Natural Resources

Water Pollution in Iowa Sediment

Water Pollution in Iowa Excess Nutrients Nitrogen & Phosphorus

Water Pollution in Iowa Pathogens

Let the Flood Plain be a Flood Plain Nutrient rich soils settle out in the flood plain not in the stream Sunlight kills pathogens

Let the Flood Plain be a Flood Plain Reduce sediment loads from bank erosion

Let the Flood Plain be a Flood Plain Less Mess Less Damage Less Water Pollution

Flood Mitigation in the Watershed Reduce: Flood Frequency Intensity

Flood Mitigation in the Watershed Increase Retention Increase Infiltration Reduce Pollution

Retain Water in Watershed Storm Water Retention Basin Pond Sediment settles out Sunlight kills pathogens

Retain Water in Watershed Wetlands Sediment settles out Sunlight kills pathogens Plants capture nutrients

Let The Water Soak In Terraces Keeps sediment and phosphorus in the field

Let The Water Soak In Cover crops Nitrogen held in plants Permanent grass Keeps sediment and phosphorus in the field

Let The Water Soak In Conservation Tillage Stream Buffers Keeps sediment and phosphorus out of the stream Nitrogen held in plants

Let The Water Soak In Rain Gardens Bioswales Water evaporated through plants Nitrogen held in plants

Let The Water Soak In Pervious Pavement Less pollution washes off pavement Green Roofs Water evaporated through plants

Conclusion As we work to: Reduce flood frequency & intensity Reduce damages from flooding

Conclusion Hold more rain water in the watershed

Conclusion Let the flood plain be a flood plain

Conclusion Improve water quality

Chuck CorellAllen BoniniBill Ehm Iowa Department of Natural Resources