Puente Narrows Underflow

Puente Narrows Underflow

Each year, a third-party firm measures the subsurface flow passing from the Puente Basin to the Main San Gabriel Basin.

Data is gathered by taking measurements from two wells in the basin, upstream well 2S/10W-9Q, and downstream well 2S/10W-8E3. The annual reports are available here:

 

Puente Narrows Underflow 2016-17

Puente Narrows Underflow 2015-16