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Is Plunketts Creek Using Its Floodplain?

A lot ot people would look at the photo below and think, “oh no! That’s awful.”

This is a photo from Thursday, September 23, 2021. The PA Game Commission’s Food and Cover crew stopped in to see how things were doing.

This is looking at the same trees in the first “flood photo” from a different direction. The flood water is pushing out of the Creek, between the trees, and into the field.

This is the project site on Plunketts Creek that the United States Army Reserves’ 333rd Engineering Unit’s 1st Platoon worked on for their summer training. The soldiers worked to remove an earthen berm.

The soldiers used heavy equipment to pull apart an earthen berm and move it out of the floodplain.

Here the soldiers are working in the area between the trees shown in the flood photo.

This solider is leaving an edge that a more experienced equipment operator would come back and “finish.”

Trent is holding the survey rod “on top” of the berm. The bottom of the staff is resting where the top of the berm once was.

The Friday after Ida moved through (Friday, September 24, 2021) NPC staff went to visit the Plunketts Creek site. Not just because it was a beautiful morning, but because we wanted to see what Plunketts Creek did and where Plunketts Creek went with all the rain.

We wanted to see if there was flood debris that would need removed. This tree branch got caught up on the wooden stakes used to hold the jute mat in place (technically it’s a coconut fibre woven in to a grid).

There was also plant material caught on the stakes.

But, the good news is there’s fresh sediment (soil) too. As the flood waters spread out, the slow down in speed. As the water slows down, the sediment has a chance to settle out.

Think about stirring powder into a glass of water. As the water stops twirling around, some of the powder will settle into the bottom of the glass if it’s given a chance to sit.

A piece of a tree branch (about 1.5 inches in diameter and 18 inches long) got caught on this stake. You can see the gravel that deposited out behind that piece of branch. The branch provided a break to the flow and allowed the water to slow down. That slowing water was enough that material dropped out.

This long stretch of fresh sediment was one of the most exciting scenes. (Yes, this is what we find exciting.)

Plunketts Creek has access to its floodplain now. The water can easily rise up and move into the floodplain and slow down. The sediment drops out and erosion is reduced if not eliminated.

As the water recedes, the sediment remains. This sediment, or dirt and sand, provides a base for grass and plants to grow. A lot of Plunketts Creek has rocky edges. Getting plant material back along the Creek will provide a filter to keep sediment ouf the Creek (think about future rain storms washing dirt across the surface) and that vegetation helps to slow down flood waters a little more.

During our visit we also looked at the vegetation for signs on where the water had flowed. Here you can see the vegetation is pushed all the way over. You can also see in the lower right hand corner, sediment that was caught in the grass.

The erosion in the background is from either the 2011 flood or the 2016 flood in the watershed.

This is the same areas as the flood photos above. You can see the sediment that was dropped in (it looks more sandy here than soil-y) and the grass is knocked over. (This was another exciting scene for NPC staff.)

The signs from this first high water event are all good. Plunketts Creek used its floodplains and is deciding where it wants to settle.

Thank you to Pennsylvania American Water for sponsoring October’s blog!

Survey Work at Plunketts Creek

Some survey work was done last week at State Game Lands 134 (along Plunketts Creek in Lycoming County) to get information on the elevation at the site with the berm removed. As you may recall NPC partnered with the PA Game Commission, the 333rd US Army Reserve Engineering Unit, and numerous other groups to reconnect Plunketts Creek to its floodplain by removing an earthern berm along the Creek.

Mark and Trent with BluAcres found the control point from the survey work during the design phase and set up the equipment.

The yellow spot on the ground is a piece of rebar with a cap on it. This was set as a control point the first time they went out and will be used at every subsequent visit.

Trent found the previous survey points and collected data at those points.

Trent has a map of the previous points in his left hand and the survey unit in his right hand. Surveying is a lot different than it used to be.

Trent even humored me and held up the staff so the tip was “sitting” on what would have been the top of the berm.

The bottom of the staff is “sitting” on top of the berm. So basically, Trent would be up to his neck in dirt if the berm were still there. (Trent was so accomodating in part because he is a graduation of Lycoming College and worked summers for the Clean Water Institute at the College. Dr. Zimmerman generall has the CWI-ers spend at least a day on a project of the northcentral stream partnership.)

They’ll download the data. There will be some computer magic and then there will be a pretty new map. This work is to help the agencies who issued permits that the work resulted in the correct grade – the stream is reconnected to its floodplain.