UPPER SLIGO CREEK: FLORA LANE TRIBUTARY- AMERICAN EEL HABITAT RESTORATION PROJECT

Transcription

1 UPPER SLIGO CREEK: FLORA LANE TRIBUTARY- AMERICAN EEL HABITAT RESTORATION PROJECT

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3 -Background Fish Habitat t and Restoration ti M-NCPPC, MCDEP and COG constructed a stormwater parallel pipe and weir system Featured two concrete flow splitting weirs diverting the first one-inch of stormwater runoff into a ~ 700 long storm drain system Weir No. 1 was designed to divert the more polluted Beltway/Georgia Avenue runoff Weir No. 2 includes a six inch diameter baseflow port designed to pass the cleaner groundwater flow from the Metro Forest Glen Station pumping.

4 The image part with relationship ID rid2 was not found in the file. The image part with relationship ID rid3 was not found in the file. The image part with relationship ID rid4 was not found in the file. Parallel Pipe Sligo Creek Weir No. 2 Weir No. 1

5 Columbia Blvd. 48 CMP Pumping Groundwater Up From Forest Glen Metro Station Weir No. 1 Weir No. 2

6 -Background Upon completion and for almost 14 years thereafter, Flora Lane tributary was able to regularly support 6-7 fish species. Unfortunately, by 2009 sedimentation had severely compromised Weir no. 2 s ability to consistently pass the full baseflow discharge. Available fish habitat was further reduced by the partial collapse of one of the two 48 CMP hikerbiker trail culverts, which created a fish barrier.

7 -Background In late 2009, COG and M-NCPPC applied and received (in 2010) $75,000 in funding from the Chesapeake Bay Trust (CBT) for the following: 1. Weir No.2 Sediment Removal to restore baseflow 2. Modification of the hiker-biker trail culverts to eliminate the fish barrier to open up an additional i 500 feet of the Flora Lane tributary to various native minnow species and American eels 3. Stream habitat enhancement via the installation of rock vanes to reduce the likelihood of future stream downcutting, as well as to improve pool habitat for larger fishes. 4. Raising of the Weir No.1 invert to divert a greater volume of runoff into the parallel pipe pp system. 5. Reforestation (with deer exclosure) of approximately 0.75 acres of riparian buffer. 6. Various stewardship-related activities.

8 -Project Partnership Budget $75,000 of FAF/CBT funds was expended that included design, permit and constructions $95,000 of M-NCPPC Cash and In-kind services was expended that included design, permit, construction and plant materials $30,000 of COG Cash and In-kind services was expended that included plan design assistance and construction cost-sharing, Weir No. 2 sediment removal, deer exclosure fencing and plant materials

9 Project Schedule Phase Timeframe Design and Permitting Weir No. 2 Fall 2010 Construction Weir No. 2 Jan 2011 Design and Permitting Culvert Rehab Spring 2011 Design and Permitting Bridge Fall 2011 Construction Bridge and Weir No.1 Feb-April 2012

10 Before: Weir No. 2 Sedimentation and Related Downstream Habitat Condition (July 2009)

11 Weir No. 2 Weir No. 2 Sediment Removal (January 2011)

12 After: Weir No. 2 Post Sediment Removal and Related Downstream Habitat Condition (February 2011)

13 Hurricane Irene (October 8, 2011)

14 Riparian Reforestation and Deer Exclosure Installation (December 2011)

15 Footbridge Replacement (April 2012)

16 Bridge Challenges Hurricane Irene Emergency authorization for stabilization and repairs Redesign plans to install bridge and obtain permit modifications Scheduling bridge assembly and delivery WSSC 30 inch watermain behind abutment Trail used as major commuter route Stream closure period Active local environmental groups

17 E h d W i N 1 R i d Enhanced Weir No. 1 - Raised Invert (~ 12 ) New Cross-Vanes

18 May 5, 2012 American Eel and Fish Reintroduction/Stewardship Event

19 Project Signage and Kiosk

20 Rosyside Dace Blacknose Dace White Sucker Tessellated Darter Longnose Dace N. Creek Chub Green Sunfish