Looking down in a cable tool well, note the Mills Knife perforation at about 3 o'clock. What we're looking at is the fill in the bottom of the well (depth unknown, thickness of fill unknown). Take note of the uniform color and texture of the fill, and that it's moving!

"This appears to be filamentous bacteria growing in several of the Mills Knife perforations. They may be proliferating at this depth, preferentially, because of greater water flow, perhaps more nutrients in that particular part of the aquifer, or some combination of both, or other factors yet to be determined.

Wire-wrapped, rod-based well screen is commonly used in water supply wells. Aegis Groundwater Consulting (Aegis) has conducted hundreds of well rehabilitation on such screens, and for improved communications between clients, consultants and contractors we've adopted some terminology to aid in describing conditions we see in well videos.

Captured in an older, operational irrigation well in the Central Valley of California (my apologies for the pause in the replay, older systems sometimes do that). Water is spraying into the well through nearly entirely plugged louvered casing, above the static water level.

The Central Valley of California has, and will continue to have, episodes of ground subsidence related to groundwater withdrawals. Damaged structures, sinking poles and posts, and well heads sticking up are all surface indications of subsidence. However, more insidious are the effects on the well, at depth.

There are so many things that could be said about this old irrigation well. From broken leaky casing, to lack of maintenance, to the obstructions in the bottom. But it is the obvious that draws you in, and makes you ask "Which came first, the mouse, or the golf ball?".

Uploaded by Aegis Groundwater Consulting, LLC on 2017-06-05.

Uploaded by Aegis Groundwater Consulting, LLC on 2017-06-05.

Aegis Groundwater Consulting was asked to look into a problem related to naturally occurring gas in a well, which was interfering with pumping. The gas is originating at depth in the well, and when entrained into a turbine pump, significantly reduces the amount of water that can be pumped.