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' t <br /> Town of Nashpe, <br /> ; I ' "i rya Neck- oac�-Month <br /> asl �, �asao .usts 02649 <br /> Conservation Commission <br /> 11/2/2020 <br /> Mashpee Board of Selectmen <br /> FROM: Drew McManus - <br /> Conservation'Agent <br /> RE: Santuit Pond short term water.quality improvement measures <br /> DESCRIPTION: <br /> We are-looking at flooding the 10 acre abandoned cranberry bog bordering Santuit Pond on the eastern <br /> side within the Santuit Pond Preserve: The purpose of flooding this bog is to reduce-the amount of <br /> phosphorous that would otherwise be available/• regenerated into pond during the warmer . <br /> spring/summer months thus providing a catalyst for algae blooms. The plan would be to flood the <br /> entire 10 acre bog complex by pulling ail boards at two side by side culverts connecting the'-pond to the <br /> bogs. once the bog is flooded to capacity (usually about a week after boards are pulled), the boards <br /> will be.placed back into the culverts and the water *in the bogs'Will-drain down into the groundwater. It <br /> is expected that the phosphorous/nutrients will be retained in the bog surface and used by the existing <br /> vegetation during the next growing season. Removing some of the phosphorous from the pond water . <br /> is'expected to reduce the amount phosphorous normally available in Santuit Pond, thus reducing the <br /> likelihood and/or frequency of algae blooms starting in the spring and summer months. <br /> Measurements using existing ,water quality monitors and water,quality testing will take place prior to <br /> the bog flooding and then post flooding to'assess the effectiveness of this approach.*If successful, we <br /> can look at doing an additional bog flooding before the end of winter. <br /> The culvert at the rear'of the bog will•be sealed up so as to prevent water from escaping during the <br /> 'flooding process. The natural draining of the flooded bog is expected to take 2-3 weeps. -The bog <br /> .f l o o ding will al s o' help .to alleviate the c-an6n t high water 1 ev&l s that Santuit Pond, is currently <br /> experiencing,thus reducing shoreline flooding and erosion. <br /> TIMELINES: we- are looping to flood the bogs within the•next 2 weeks once all. the measuring <br /> protocols have been established and are ready to go, <br /> -Drew McManus <br /> Conservation Agent <br /> Town of Mashpee <br />