July 2010 - Parks & Recreation - 18

Who, What, Where & how Around the Parks

how we did it

Sedimentary, My Dear Watson
How Lake Henrietta was restored to it old self.
by Archis Ambulkar and Stephen N. Zeller

S

ediment accumulation
at the bottom of waterways
can potentially affect water
quality, navigation, recreation, or any other intended
uses. That's why sediment removal is
practiced, in order to restore the original quality, nature, and appearance of
a sedimented body of water. Selection
of appropriate sediment removal technology depends upon various factors
including costs, permits, duration, location, accessibility.
Lake Henrietta is a four-acre lake
located in Doubling Gap, Pennsylvania, on the property of the Doubli ng Gap Center Yolijwa
camp ground. The lake is
part of a Christian summer camp that utilizes
the lake for boating and
other recreation including fishing. The lake is part
of Doubling Gap Creek, a cold
water fishers stream flowing through the
Doubling Gap Valley. Doubling Gap state
park is directly upstream from the Lake
Henrietta. Over time, sediments accumulated in the upper reaches and along
west side of the lake. This sediment deposition came primarily from leaf material and sand from the erosion of the local
geology in the area.
Before pursuing sediment removal, the owners of the camp weighed the
pros and cons of taking no action. Doing
nothing would result in the deposition of
30 to 40 percent more material every 10
years into the lake. This continued deposition of sediment and leaves would most
likely result in odors issues resulting in
septic conditions and providing habitat
for breeding of mosquitoes and other
vectors. Not least, the deposited material

16	 Parks & Recreation

J U LY 2 0 1 0

How

WE

DID IT

Above: Lake
Henrietta
before its
restoration.
Left: The lake
today.
Above right:
Large tubes
store the
sediment for
later use.

would hinder the enjoyment by campers
and camp staff of the lake.
Some of the common methods for
sediment removal from lakes include
draining and excavating a lake, mechanical dredging, and hydraulic dredging.
While reviewing options for sediment
removal, Brinjac Engineering Inc. focused on cost-effective dredging alternatives with minimum environmental
impacts for sediment removal. Since this

w w w . N R P A . ORG

waterway was a part of high quality trout
stream, minimizing impacts to the environment was critical. During review, the
conventional truck-and-loader method
was compared to hydraulic dredging.
The estimated cost for hydraulic
dredging work was $117,500, which
included bags, pumping equipment,
crews, and associated equipments for
dredging. This cost was compared with
the costs associated with conventional



July 2010 - Parks & Recreation

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