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Restoration Project for Eroding Creek Bank at Dingmans Creek, Delaware Water Gap

This project aims to stabilize and restore a 200 ft section of the eroding creek bank at Dingmans Creek, using traffic control stones, single stone bendway weirs, vegetation, and a random boulder field. The goal is to prevent further erosion and create a more stable and natural habitat.

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Restoration Project for Eroding Creek Bank at Dingmans Creek, Delaware Water Gap

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  1. DINGMANS CREEK, SITE 4, SMALL SLIDE, DELAWARE WATER GAP PROJECTVEGETATED KEYS; TRAFFIC CONTROL STONES; PLANTINGS; SINGLE STONE BENDWAY WEIRS; & A RANDOM BOULDER FIELD FOR ROUGHNESS & AQUATIC HABITAT

  2. PROBLEMS • For approximately 200 ft Dingmans Creek is flowing against & eroding the left valley wall (estimated height 35 ft). The amount of fine sediment delivered to the stream is significant. This entire colluvium slide is very unstable. If erosion progresses at this site it may kick the stream back toward the park road downstream and create a threat to road stability (Johnny B. Mountain Road). • The point bar (right side) of the channel is very rough with a number of boulders increasing the hydraulic roughness & impeding flow.

  3. PRE-PROJECT PHOTOSby Dave DerrickDec. 15, 2008 (HIGH WATER)LEAF OFF CONDITION

  4. HIGH WATER-Looking US @ project bank. Stream is obviously eroding this bank, which contributes significant sediment to the system PRE-PROJECT DINGMANS CR-SITE 4 PIX BY DERRICK 12-15-2008

  5. HIGH WATER-Looking DS toward DS end of project. PRE-PROJECT DINGMANS CR-SITE 4 PIX BY DERRICK 12-15-2008

  6. THE PLAN

  7. METHODS EMPLOYED • 35 Vegetated Traffic Control Stones (TCS) • Every 4th TCS is keyed 10 ft into the bank (perpendicular) with rooted Black Willow whips & other live poles planted at a rate of 3 plants per ft. • Every 4th TCS has a Single Stone Bendway Weir (SSBW) to move the thalweg away from the left bank & toward the center of the channel approximately 5-8 ft. • The space between & behind the TCS is heavily vegetated with a variety of species of rooted-stock trees & shrubs. • The loose eroding talus slope slide was heavily planted with several species of rooted-stock shrubs & trees • Native boulders from the point bar were placed as a random boulder field streamward of the TCS & SSBW.

  8. Correction: There should be 3 Traffic Control Stones between each Single Stone Bendway Weir, not 2. Courtesy of Ecological Restoration, Inc.

  9. SOLUTIONS (THE PLAN) • This project is designed to stabilize 200 ft of the bank at the present location by increasing roughness of the entire bank with 3 gallon container rooted-stock trees & shrubs. • Hard protection is limited to the toe & includes 35 vegetated Traffic Control Stones (TCS). TCS were typically 3 ft by 3 ft by 4 ft & spaced 3 to 6 ft apart. Every 4th TCS was keyed 8 to 10’ into the bank & had a Single-Stone Bendway Weir (SSBW) placed at the stream end. Live poles were placed in the key trench before stone was placed. Eight SSBW were built. • A random natural bedload boulder field was placed around & in front of the SSBW & TCS’s.

  10. TCS SSBW Key Courtesy of Ecological Restoration, Inc.

  11. PLANTS PLANTED Common Name # Size • Gray Birch 50 2 gallon pots • Gray Birch 200 unrooted poles • Buttonbush 25 bare root • Silky Dogwood 200 bare root • Ninebark 175 bare root • Rhododendron 50 3 gallon pots • White Pine 150 3 gallon pots

  12. Two healthy Single Stone Bendway Weir (SSBW) stones. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK 9-19-2009

  13. CONSTRUCTION PHOTOS by Dave Derrick, September 19-20, 2009

  14. Key Traffic Control Stones (TCS) with Single Stone Bendway Weirs (SSBW) & vegged keys & pole plantings Key Key Key TCS TCS TCS Key TCS TCS Key SSBW TCS TCS TCS SSBW Key Thalweg TCS SSBW Traffic Control Stones (TCS) sized about 3 ft by 3 ft by 4 ft, dug into the bed & bank, designed to stabilize & roughen the bank, are spaced 3 to 6 ft apart. Every 4th TCS is keyed into the bank & has a Single Stone Bendway Weir attached. 8 SSBW total

  15. Key Key Key TCS TCS TCS Key TCS TCS Key SSBW TCS TCS TCS SSBW Key Thalweg TCS SSBW Rooted–stock container shrubs & trees added to Traffic Control Stones at toe & all bare areas of the entire eroding bank

  16. CONSTRUCTING THE VEGETATED KEY, TRAFFIC CONTROL STONE, & SINGLE STONE BENDWAY WEIRS FOR # 4 & 5.

  17. Place Live Poles against both sides of trench Detail for key Flow

  18. Detail for key Place stone in key trench. Flow

  19. Looking across @ stone being placed in the key for Bendway Weir #4. Live poles have already been placed in the key trench. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK 9-19-2009

  20. Close-up of stone being placed in key for BW #4. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK 9-19-2009

  21. Looking across @ key installation of BW #5. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK 9-19-2009

  22. Looking across @ live poles & key stones in BW #5. CONSTRUCTION DINGMANS CR-SITE 4 PIX BY DERRICK 9-19-2009

  23. Choke stone with gravel-cobble (white areas) & water in Detail for key Flow

  24. Backfill and overfill with native soils, then compact (some settling will still occur) Detail for key Flow

  25. Detail for key Seed Flow DONE WITH THE KEY

  26. Close-up of a Single Stone Bendway Weir (SSBW) & vegged key & pole plantings Key Key Key TCS SSBW Thalweg

  27. CONSTRUCTION COMPLETEPhotos by Dave Derrick SEPT. 24, 2009Very natural, minimal structure approach

  28. Construction complete, looking DS @ 175 ft of the 200 ft long project. This should look completely natural in a couple years!! CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  29. Construction complete, looking DS. TCS, Single Stone Bendway Weirs, random boulder field, many pole plantings & rooted-stock plants provide plenty of roughness @ toe of slide. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  30. Construction complete, DS @ the random boulder field & planted slide. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  31. Construction complete, looking across @ Bendway Weir #3, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  32. Construction complete, looking across @ Bendway Weir #4, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  33. Construction complete, looking across @ Bendway Weir #7, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  34. Construction complete, looking across @ dense rooted-stock plantings of trees & shrubs on the DS 1/3 of the slide area CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  35. Construction complete, looking across @ Bendway Weir #5, along with a vegetated key, hillside plantings, & TCS US & DS. CONSTRUCTION COMPLETE DINGMANS CR-SITE 4 DERRICK 9-24-2009

  36. 1 YEAR AFTER PROJECT COMPLETION Photos by Dave DerrickSEPT. 12, 2010

  37. 1 YEAR LATER-Looking @ LDB Bendway Weir #1. BW is stable, plantings are growing, upper bank stable. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  38. 1 YEAR LATER-Bendway Weir #2. Plantings will trap & stabilize eroded material from the upper bank. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  39. 1 YEAR LATER-Looking @ plantings & Bendway Weir #2. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  40. 1 YEAR LATER-Looking @ Bendway Weir # 2 & plantings. All stable, growth good, deep pool off stream end of Bendway Weir. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  41. 1 YEAR LATER-Looking DS @ well-aligned channel with stone & veg roughness on outer bank throughout the bend. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  42. 1 YEAR LATER-Stream has put almost all of the stone in compression (imbricated) 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  43. 1 YEAR LATER-Mid-project Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  44. 1 YEAR LATER-Mid-project Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  45. 1 YEAR LATER-End of project Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  46. 1 YEAR LATER-Looking US @ great functioning channel & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  47. 1 YEAR LATER-Looking US @ Bendway Weirs, Traffic Control Stones, & vegged floodplain bench. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  48. 1 YEAR LATER-Looking US stable mid-section of project. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  49. 1 YEAR LATER-Looking US @ robust plantings that will stabilize the bank & trap coluvium for bare areas of upper bank. 1 YEAR LATER-DINGMANS CR.-SITE 4-PIX BY DERRICK 9-12-2010

  50. Cleophus says “Geaux Saints”

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