1. Iowa’s River Restoration Toolbox Level 1 / Base Training
Module # 9 BANCS Model
Iowa’s River Restoration Toolbox Level 1 / Base Training

2. Heading for a Bullet Text Slide (36 Arial)
BANCS Model Overview
Bank Assessment for Non-point source Consequences of Sediment (BANCS) method
Two Components:
Bank Erosion Hazard Index (BEHI)
Near-Bank Stress (NBS)
Predicts Bank Erosion Rate

3. BEHI Variables Study Bank Height Bankfull Height Root Depth Bank Angle
Surface Protection
Bank Material Adjustment
Stratification Adjustment
Bank Length
Reach Length

4. BEHI Study Form Used to Develop Adjective Rating: Very Low Low
Moderate
High
Very High
Extreme
Bank Profile Sketch

5. Bank Height Ratio
Study Bank Height
Bankfull Depth

6. Root Depth/Study Bank Height

7. Weighted Root Density
Root Depth
Root Density %

8. Bank Angle
Bank Angle

9. Surface Protection
Average Surface Protection Over Entire Study Bank Height

10. Bank Material Adjustment
Based on Dominant Bank Composition
Bedrock – Very Low BEHI
Boulders – Very Low BEHI
Cobble – Minus 10 Points
Gravel – Add 5 to 10 Points
Sand – Add 10 Points
Silt/Clay – No Adjustment

11. Stratification Adjustment
Based on Presence of Stratification – Add 5 to 10 Points
One Layer – Add 5 Points
Multiple Layers – Add 10 Points

12. BEHI Study Form Used to Develop Adjective Rating: Very Low Low
Moderate
High
Very High
Extreme
Bank Profile Sketch

13. BEHI Summation

14. NBS Estimation Methods

15. NBS as a Function of Thalweg Position

16. BANCS Curves BEHI Rating NBS Rating
Used to Predict Average Erosion Rate
Limited Number of Curves

17. Using BANCS to Assess & Prioritize Restoration – Elm Fork Case Study
In Lieu Fee Project
BANCS Data Collected as Part of 5 Year Monitoring
Used to Predict Calculate Sediment Reduction

18. New Photo set up needs to occur here
New Photo set up needs to occur here. Put in 4 or 5 photos staggered on the edge of one another with maybe and orange border (match our company colors). See slide 10 for a general idea.

19. Elm Fork Stream Restoration
Entrenched stream
Minimal riffle habitat
Significant erosion
Raised channel bed
Increased riffle/pool habitat
Project encompasses 8,500 feet of restoration

20. STABILITY/HYDRAULIC CONSIDERATIONS
Native Stone and Wood Features
STABILITY/HYDRAULIC CONSIDERATIONS
Vernal Pool
Groundwater Dam
Oxbow
Old Channel
Raised Stream Bed

21. Pre Restoration BANCS Model

22. Post Restoration BANCS Model
Total Sediment Reduction – 6,495 Tons/Yr Represents 7,145 lbs. of Phosphorus & 13,520 lbs. of Nitrogen Annually

23. After 2 Growing Season

24. Iowa’s River Restoration Toolbox Level 1 / Base Training
Module # 9 BANCS Model
Iowa’s River Restoration Toolbox Level 1 / Base Training