Sunday, July 23, 2017

Irrigation Intake Screen Install

Last year, we began finding items such as plastic bags (and fish) in one of the pump station's intake wet well.  In the fall, we had a diver inspect the intake pipe screen. What he found during that inspection were some gaping holes in the original metal screen.
The original screen wasn't keeping anything out.

This past Monday, we finally had the intake screen replaced on this station, which is located between #5 and 6.  While the serious work was taking place under the water, we had plenty to keep us occupied on the surface.   
The new stainless steel screen is ready to be installed.

The first step was to remove the build up of silt around the intake pipe using a dredge pump. 
Again, there was a tremendous amount of setup required, including the placement of a "turbidity curtain" in the pond, to prevent cloudy water from getting back to the intake screen area, further hampering visibility. 
The dredge pump is being setup.

The pump's discharge hose, deposited the sediment into a geotextile bag.  The bag initially wanted to slide towards the water, so we placed one wheel of a utility cart on the bag to hold it in place. 
The bag filled up quickly, and it soon became clear that the cart was no match for this bag.

To get the screen in place, lift bags were attached, then it was carried out to a point where it could float.

The screen is being floated out to the end of the intake pipe.

Given the hot temperatures, nobody was complaining about having to go for a dip.  An air hose was connected to a small compressor and the lift bags, giving the diver the ability to adjust the level of the screen as he set it in place, and attached it to the intake pipe.

It was a long, hot day, and after 8:00 p.m. when the install was completed.  However, if it lasts for another 25+ years, it was well worth it!

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