Griswold Creek August 22, 2013

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1 Creek August 22,

2 Lake Erie Protection Fund Creek Study ver Evaluate the overall condition of Creek Determine stable channel dimensions & appropriate restoration techniques Starting Stat gpoint for future utuepojects projects CRWP still available to provide site visits & recommendations & to help find grants 2

3 er Partners, Inc. Non-profit organization formed in 1996 by watershed communities. Technical assistance to minimize flooding, erosion, and water quality issues. ver Biomonitoring specialists Joel Bingham Manager Restoration Services Designing and building streams since

4 Valley View WWTP SR 322 Bessie Benner Metzenbaum Park ver Laurel School Davis Dam The Club at Hillbrook Bowen Dam SR 87 Fairmount 4

5 dstream Process 5 Creek er

6 ver During the flood is when the power responsible for creating and maintaining the channel occurs We evaluate habitat at base flow on a sunny day Fluvial Processes Flow Sediment Interaction between flow and erodible sediments Sediment entrainment, transport and deposition *Streams in equilibrium are said to maintain a balance between flow contribution and sediment transport and deposition 6

7 7

8 How do you study a river or stream? Common features can classify and categorize streams for comparison ver d Even though they are unique- Components of a Stream Pattern Profile Dimension 8

9 Components of a Stream Streambed Profile Longitudinal profile Dimension Cross section ver Stream Pattern Geometry Bankfull corresponds to flow stage just before entering the flood plain. * 9

10 10 ver d

11 Channel Evolution ver 1. Vertical incision from floodplain 2. Widening erosion of stream banks degradation 3. Deposition- aggradation 4. Creation of new channel at lower elevation 11

12 12

13 Channel Stability ver Extremely important to maintain both vertical elevation control Loss of access to floodplain initiates channel evolution process Caused by storm water, dredging, channelization, incision of a main stem river 13

14 14

15 d Creek Assessment 15 Creek er

16 Valley View WWTP SR 322 Bessie Benner Metzenbaum Park ver Laurel School Davis Dam The Club at Hillbrook Bowen Dam SR 87 Fairmount 16

17 Slope Variability = Power 0.55% 0.71% 1.1% 0.25% 0.66% ver Mayfield *Profile produced from Lidar topo elevation data Fairmount Dines Stump Hollow 1.1% Kinsman 17

18 Impairments Summary Erosion Down-cutting Headcut Sediment Aggradation Degradation 18 Creek er

19 Creek ver Erosion Natural and manmade causes Streams erode and deposit naturally Rate and magnitude of erosion Hillbrook Club Metzenbaum 19

20 ver Headcut Is a limit of headward (moving upstream) erosion of the channel Areas of extreme power Niagara Falls is a head cut Dines Road 20

21 ver Sediment Aggradation Sediment accumulates in overwide areas following erosion Sediment facilitates change Creates foundation for new floodplains Thornberry Hunting Valley South of SR87 21

22 Creek ver Degradation Erosion in high energy areas caused by stream adjustment Creates wider stream channels Thornberry Thornberry 22

23 ver Dams Create a barrier for wildlife Hinder movement of sediment downstream Create vertical stability Need maintenance High risk due to amount of elevation at one location Bowen Dam Bowen Dam 23

24 Valley View WWTP SR 322 Bessie Benner Metzenbaum Park ver Laurel School Davis Dam The Club at Hillbrook Bowen Dam SR 87 Fairmount 24

25 Elevation The Club at Hillbrook Cross Section Width ver Elevation (ft) Longitudinal Profile bed water srf bankfull Channel Distance (ft) 25

26 The Club at Hillbrook ver Slope 1.1% Entrenched Degradational Phase- widening Active floodplain is 5ft down from original floodplain Commonly moves 6 diameter rocks Lacks useable floodplain 26

27 Geauga Park District s Bessie Benner Metzenbaum Park Elevation Cross Section Width ver Elevation (ft) Longitudinal Profile bed water srf bankfull Terr RTOB LTOB Channel Distance (ft) 27

28 ver Geauga Park District s Bessie Benner Metzenbaum Park Slope 0.8% Moderately entrenched Floodplains are more accessible Portions aggrading due to logjams Predominantly sand substrates substrate easily transported by stream Large wetland surrounding Could be improved by making stream access floodplain more frequently - benefit downstream areas 28

29 ver Elevation Elevation (ft) Laurel School Cross Sections Longitudinal Profile Width bed water srf bankfull x-section Channel Distance (ft) 29

30 Laurel School ver Moderately entrenched in lower reach Floodplains are more accessible Sediment transport functional= equilibrium Reach exhibits some stability Benefitted by reduction in gradient downstream of Fairmount Rd (Longitudinal profile) 30

31 ver Potential Causes & Conceptual Solutions Main stem er incised- causing head cut erosion Increased storm water Channel incision creating loss of floodplain access Dam failure Storm water control / detention Maintain or create vertical stability Create areas for floodplain Create areas for flood storage 31

32 Typical Condition 1 Floodplain Expansion 32 Creek er

33 Typical Raise-Grade 33 Creek er

34 Concept Examples 34 Creek er

35 35 Creek er

36 36 Creek er

37 37 Creek er

38 38 Creek er

39 Cross Sectional Area Curve Reference sites- Provide important information on stable, functional condition Blueprints for design and Construction ver drainage area (mi 2 ) cross sectional area (ft 2 ) Stream Valley View Wastewater Treatment Plant Metzenbaum Park Laurel School # Laurel school # Hillbrook Club Bowen Dam

40 Summary ver What is happening? Creek is undergoing active channel adjustment Loss of floodplain access is overwhelming system with sediment Channels widening to make new floodplain l Channel evolution process 40

41 Strategies ver Storm water storage and infiltration Decrease bank erosion Raise Grade to historic floodplain where feasible Vertical elevationcontrol is important Need to prevent additional Channel evolution Headwater runoff storage Everyone in the watershed can do a part Cooperation and Collaboration to make things happen 41

42 Questions Joel Bingham, Restoration Manager ver er Partners, Inc. Amy Brennan, Director Keely Davidson-Bennett, Program Associate 42

43 Extra 43 Creek er

44 The Club at Hillbrook 44 Creek er

45 Geauga Park District s Bessie Benner Metzenbaum Park Creek ver Re attach floodplain Raise grade Create floodplain and stormwater Storage Public Land 45

46 Tree Falls Bookman Bookman 46 Creek er

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