1. Natural Resources Conservation Service Software Introduction: Split Desktop Version 3.0 Kerry M. Robinson Hydraulic Engineer, ENTSC

2. Natural Resources Conservation Service Objective  Overview rock sizing software capabilities and limitations and limitations

3. Natural Resources Conservation Service Redirective Techniques

4. Natural Resources Conservation Service Drop Structures/ Grade control

5. Natural Resources Conservation Service Stream Channel Stabilization and Restoration Projects

6. Natural Resources Conservation Service We have many methods to design rock treatments.

7. Natural Resources Conservation Service  How do you insure that delivered rock meets your specification?

8. Natural Resources Conservation Service  Test pile  ASTM  Sieve Analysis  Weight  Experience  Others?

9. Natural Resources Conservation Service Why use this proprietary software? Safety Speed Reduce subjectivity Improve quality control Feedback to rock supplier The software is not cheap. It costs about $8000 per fully licensed copy.

10. Natural Resources Conservation Service How does it work?  Take a digital photo with scaling object(s) in the photograph.  Process the photograph with this software.

11. Natural Resources Conservation Service How does it work?  Software automatically delineates or identifies edges of rock fragments.  You scale the known size object.

12. Natural Resources Conservation Service Results Software provides a median rock size (D 50 ) and a sample gradation

13. Natural Resources Conservation Service Assumptions  The surface material is representative of the material underneath.  Your photo sample is representative.

14. Natural Resources Conservation Service Fines Assumption For this evaluation, the fines have been assumed to be zero.

15. Natural Resources Conservation Service Lighting  If possible, take pictures with uniform lighting  The software will see a shadow as a rock edge  More manual editing will be needed.

16. Natural Resources Conservation Service Sample Size  Keep the sample small but representative  Approx 8 D 50 wide (rough estimate)

17. Natural Resources Conservation Service Angle of Photograph  Best results when photo is normal to rock surface.  The software automatically compensates for the photo angle using the scaling objects.  Recommend a photo angle less than 45 degrees from normal. Use scaling objects in two diagonal corners of the photo.

18. Natural Resources Conservation Service What is the median stone size? Let’s see how good you are at estimating rock size. The scaling disks are 9 inches in diameter. What is the median rock size of this sample?

19. Natural Resources Conservation Service

20. The sieve analysis for this material was 11 inches. This program calculates 11.4 in. How did you do?

21. Natural Resources Conservation Service Another Example What should the D50 be for 3 inch cubes?

22. Natural Resources Conservation Service

23. The output says the D 50 is 2.75 inches. Is it wrong? Life is not perfect and neither is this software.

24. Natural Resources Conservation ServiceConclusions  The split engineering software can accurately determine rock size.  Users need to understand how the software works to minimize problems.  Rock size and gradation can be obtained rapidly and safely using digital photography.  Loads of material have been rejected using this tool.

25. Natural Resources Conservation Service  Split-Desktop Version 3.0 is available as a 30-day free trial version.  It is CCE approved for limited use.  Go to www.spliteng.com www.spliteng.com

26. Natural Resources Conservation Service Kerry M. Robinson Hydraulic Engineer ENTSC Stream Restoration: Combining Rock with Vegetation Questions?