1. STREAM STABILITY STUDY FOR PIPELINES IN HIGH CONSEQUENCE AREAS By: Larry Blair, PE Eastern Sandoval County Arroyo Flood Control Authority (ESCAFCA) Sandoval County, New Mexico November 5, 2010

2. ARIZONA TEXAS OK COLORADO Placitas

5. A Little History Sandia Mountains; Rio Grande River; Las Huertas Creek Village of Placitas Pipelines

14. Purpose of Channel Stability Study Preserve the natural state of the arroyo Prevent potential problems with exposure of the pipeline

15. Methodology Hydrologic Analysis – 30 Years – 2 Yr – 5 Yr – 10 Yr – 25 Yr – 50 Yr – Plus 100 Yr Event Soils Analysis Predict Lateral and Vertical Movement

19. Conclusions Standards may not be adequate Stream stability study may be a good tool