FLOATING CIRCULATORS ON DUDLEY POND
by A. Richard Miller
61 Lake Shore Road, Natick MA 01760, USA
TheMillers@millermicro.com
1-508/653-6136 (9am-9pm Eastern Time)
visits since 080304; last
updated 080306.
This web page is a work in progess about another work in
progress, the floating circulator experiment on Dudley Pond in Wayland,
Massachusetts, USA. This is not an official web site for Dudley Pond. I
championed and have been documenting similar problems and evaluations
on the adjacent and larger Lake Cochituate - a chain of kettle ponds in
Framingham, Natick and Wayland, MA. My background includes physics,
engineering, computer consultation and forty years of environmental
activism for lakes, ponds, streams, open space, and the people who use
them well. I serve or have served on the Lake Cochituate Watershed
Association (Executive Director), Cochituate State Park Advisory
Committee (Vice Chair), Massachusetts Bicycle and Pedestrian Advisory
Board, Natick Environmental Concerns Commission (Chair), Natick
Conservation Commission (Chair), Natick Cancer Study Task Force
(Chair), Natick Bicycle and Pedestrian Advisory Committee (Chair) and
the Natick Cochituate Rail Trail Task Force. This is my view of Dudley
Pond -
from Lake Cochituate.
Chemical treatment with herbicides - aquatic pesticides - is a common
traditional method used to control invasive aquatic plants in lakes and
ponds. Treatments typically are required every year or two, and two
doses per year is not uncommon. Although the US EPA specifically
prohibits any claim that these chemicals are safe, one can find many
reports leading to - and against - such conclusions. Public concern
about the increasing build-up of potentially harmful chemicals in the
human body, growing questions about occasional fish kills, the
succession of even nastier invasives after one is "controlled",
the ecological imbalance resulting from repeated dosing of ponds with
pesticides, and the rising monetary cost of these regular consultations
and treatments have all fueled the search for alternative methods to
control aquatic weeds.
Floating circulators have been used successfully since 1997 to reduce
the density of Eurasion water milfoil and other rooted aquatic plants
without the use of chemicals. In October 2006, as a result
of efforts started by me in January
2006 and then picked up by others, Lake Cochituate became the first
lake in Massachusetts to install floating circulators - SolarBee units,
one on South Pond and one on Middle Pond - for the control of Eurasian
water milfoil and other invasive rooted aquatic plants. However,
equipment problems resulted in sporadic operation and total winter
ice-up until repairs
were made in April 2007. From then on, both units operated
continuously in open water and maintained holes in the ice cover
throughout winter (except occasionally, after several very dark days). As significant results are expected to show up in one to
two growing seasons (and as 2007 saw particularly intense milfoil growth across New England), we cannot yet draw any conclusions from this ongoing experiment.
Meanwhile, Dudley Pond received three SunGo units from Eco-Guide
International. They were deployed in close proximity to each other in August 2007,
again with the expectation that they would run for at least one full
growing season before significant results could be measured. However,
in March 2008 that plan is in peril. The Wayland Conservation
Commission is hearing a petition for the addition of chemicals to
Dudley Pond - this spring - which would render any results of the
circulator evaluation subject to doubt. The petitioners' presentation on
February 14th effectively ignored the published and
locally-discussed information on floating circulators, and was
continued to the evening of March 13th.
When I learned that
one of these parallel projects may be effectively abandoned, I asked
both
companies - SolarBee and Eco-Guide International - to comment on this
disturbing development. The principal of each company did comment, and
they have permitted my posting of their interesting letters (below).
Please read these letters carefully, as they contain very different
information than that which was presented by Aquatic Control Technology
(which is heavily invested in chemical applications) at the prior
hearing night before the Wayland Conservation Commission.
- Petitioners' presentation to Wayland Conservation Commission (Hearing of February 14th, 2008)
- Letter from SolarBee to Eco-Guide International (February 20th, 2008)
- Letter from Eco-Guide International to SolarBee (February 27th, 2008)
I continue to encourage the parallel evaluations of these two different
designs of floating circulators. Massachusetts will benefit from the
combined knowledge of the two types of equipment and from its own evaluation, and Dudley Pond, Lake Cochituate,
and hundreds of other lakes and ponds can profit from that work. Please do not introduce pesticides into Dudley Pond during this important and continuing project!