Orleans-02A
“Namequoit Bog ”Orleans, Paw Wah Pond
41.756588, -69.969656
Technical Specifications
Basic Properties
- Type
- Flap Gate
- Material
- Metal
- Condition
- Fair
- Geometry
- Rectangular
- Status
- Active
- Number of Gates
- 1
Operator & Management
- Operator Type
- PRIVATE
- Purpose
- Flood Protection
Dimensions & Elevations
- Dimensions
- 1.8ft diameter, 1.8ft height
- Installation Date
- 2011
Culvert Details
- Restriction Type
- Berm
- Geometry
- Circular
- Material
- Corrugated Metal
- Number of Pipes
- 1
- Dimensions
- 1ft diameter
- Condition
- Good
- Comments
- The upstream and downstream ends of the 1' diameter CMP culvert appeared to be in good condition. There was another corrugated circular plastic culvert with a diameter of approximately 10" downstream of the restriction at the Namequoit Road crossing where the channel entered Paw Wah Pond. Scour and bank undercutting were observed along the channel between the restriction and Namequiot Road. It was unclear if the scour had been caused by tidal exchange, stormwater flows from the upstream impoundment, or some combination thereof.
Historical Records
Environmental Data
- Invasive Species
- No
- Restoration Status
- In-Progress
- Invasive Comments
- The upstream impoundment appeared to be an entirely freshwater system as evidenced by cattails, atlantic white cedar, and freshwater sedge.
- Restoration Comments
- The site had good restoration potential with minimal low lying infrastructure observed; however, restoration might be limited by the requirement to preserve atlantic white cedar.
- Upstream Area
- Total: 10.03
Notes & Comments
- General Comments
- Access to the site was located at the low point of Namequoit Road where a small conveyance channel enters Paw Wah Pond. The site was located approximately 100 feet up the channel to the north from the road. Orleans Conservation Trust (OCT) upgraded the system with NRCS. DER has tide data and a copy of OCT's management plan for the upstream Namaquoit Bog.
- Operation Plan
- Yes
- Operation Comments
- The operational purpose for the metal flap gate (Orleans-02A) appeared to be strictly for upstream flood protection. The operational purpose for the riser pipe (Orleans-02B) appeared to be for restoration of the upstream impoundment. It is possible that an adaptive management plan is in place to incrementally increase the water levels of the impoundment to enable restoration.
- Gate Comments
- There were two tidal control structures located at the site. The first control structure was a rectangular metal flap gate installed on the downstream end of the restriction (Orleans-02A). The second control structure was an aluminum CMP semicircular riser pipe with a frame for placement of stop logs (Orleans-02B). Orleans-02A was in good condition and appeared to have been recently replaced as evidenced by “shiny” mounting hardware. At the time of the site visit (12/18/2015), the tide gate was inoperable and was sealed completely shut by fine grained sediment deposited in the channel. Dredging was required to restore proper functionality of the tide gate and to allow passage of upstream flow. Orleans-02B was also in good condition. The stop log frame had a 6’ controllable water level range for the upstream impoundment. At the time of the site visit (12/18/2015), there were wooden stop logs placed in the bottom 18” of the frame.
- Elevation Comments
- The extent of upstream (U/S) and downstream (D/S) tidal influence as well as the invert of the tide gate was not measured at this site as there was no headwall or other prominent point of reference from which to take a measuredown from for later referencing via LiDAR.
- External Data Comments
- Namequoit Bog Management Plan 3.24.2014 Namequoit Bog Tidal and Salinity Monitoring Data 2013
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