A helicopter was spotted Monday flying palm trees out of a canyon between Santee and Tierrasanta.
The City of San Diego is working to protect exposed sewer lines around town.
This particular canyon is near De Portola Middle School.
The helicopter can move plam trees out, or bring large rocks in to the canyon.
With El Nino expected to bring heavy rain this winter, the idea is to cover the sewer lines before there are any problems.
Story and video: http://www.nbcsandiego.com