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late March and the end of October is important for fish movement into and out of the pond and requires sufficient flow to allow fish movement. Once below Route 130, it appears that the river is groundwater-driven, although some manipulation of the fishway at the millpond at Route 130 may be necessary in some situations. 3. Establish a monitoring system to provide advance notice if the pond elevation is getting too high or too low. It is critical to establish a monitoring system of the various parameters of the system to allow advance notice of potential problems. This system should include the following: a) Establish clear responsibility for monitoring the various parameters of system and reporting the results to the party assigned responsibility for maintaining proper pond levels. b) Monitor the following parameters weekly (although this may become bi- weekly or even monthly based on accumulated experience): • elevation of the pond water level using the staff gage near the spillway, • the height of the water going over the boards in the spillway, • the number and location of boards within the spillway, • the presence of any sand, rocks, or other obstruction within the spillway, and report to the responsible party if cleaning is needed, and • a visual check of the amount of water in the stream below the spillway. c) Monitor the following parameters monthly: • check the staff gage elevation against the water elevation below the top of the spillway sidewall to ensure that the staff gage has not been dislodged, and • check precipitation and elevation of groundwater in the index well. Precipitation data may come from the Mashpee Public Works Department or the Hatchville weather station and groundwater elevations can be obtained through the Cape Cod Commission (the latter data may only be available bi-monthly). d) Monitor the following parameters seasonally: • streamflow at the spillway, at the fish ladder at Route 130, and at Route 28 to gain a better understanding of what percentage of water in the Mashpee River is surface runoff versus groundwater input. i 4. Regularly dean the spillway, area between the jetties, and/or the "pocket" areas outside the jetties of accumulated material. Regular maintenance of the "pocket" areas will minimize or eliminate sand and gravel from accumulating in the spillway or between the jetties. Horsley & Witten, Inc. Mashpee-Wakeby Pond Management Plan Page 30