STREAM STABILITY STUDY FOR PIPELINES

IN HIGH CONSEQUENCE AREAS

By: Larry Blair, PEEastern Sandoval County Arroyo Flood Control Authority

(ESCAFCA)Sandoval County, New Mexico

November 5, 2010

ARIZONA

TEXA

SOK

COLORADO

Placitas

A Little History• Sandia Mountains; Rio Grande River; Las

Huertas Creek• Village of Placitas• Pipelines

Purpose of Channel Stability Study• Preserve the natural state of the arroyo• Prevent potential problems with exposure of the

pipeline

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

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