Creek August 22, 2013 1
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
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 2002 3
Valley View WWTP SR 322 Bessie Benner Metzenbaum Park ver Laurel School Davis Dam The Club at Hillbrook Bowen Dam SR 87 Fairmount 4
dstream Process 5 Creek er
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
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
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 ver d
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
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
d Creek Assessment 15 Creek er
Valley View WWTP SR 322 Bessie Benner Metzenbaum Park ver Laurel School Davis Dam The Club at Hillbrook Bowen Dam SR 87 Fairmount 16
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
Impairments Summary Erosion Down-cutting Headcut Sediment Aggradation Degradation 18 Creek er
Creek ver Erosion Natural and manmade causes Streams erode and deposit naturally Rate and magnitude of erosion Hillbrook Club Metzenbaum 19
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
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
Creek ver Degradation Erosion in high energy areas caused by stream adjustment Creates wider stream channels Thornberry Thornberry 22
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
Valley View WWTP SR 322 Bessie Benner Metzenbaum Park ver Laurel School Davis Dam The Club at Hillbrook Bowen Dam SR 87 Fairmount 24
Elevation 112 110 108 106 104 102 100 98 The Club at Hillbrook Cross Section 0 50 100Width 150 200 ver Elevation (ft) 110 108 106 104 102 100 98 96 94 Longitudinal Profile bed water srf bankfull 0 100 200 300 400 500 600 Channel Distance (ft) 25
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
Geauga Park District s Bessie Benner Metzenbaum Park Elevation 101 100 99 98 97 96 95 Cross Section 0 5 10 15 20 25 30 Width ver Elevation (ft) Longitudinal Profile bed water srf bankfull Terr RTOB LTOB 103 102 101 100 99 98 97 96 95 94 0 50 100 150 200 250 300 350 Channel Distance (ft) 27
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
ver Elevation Elevation (ft) Laurel School 101 100.5 Cross Sections 100 99.5 98.5 99 97.5 98 96.5 97 95.5 96 0 20 40 60 80 100 120 103 102 101 100 99 98 97 0 20 40 60 80 Longitudinal Profile Width bed water srf bankfull x-section 101 100 99 98 97 96 95 94 93 92 91 0 100 200 300 400 500 Channel Distance (ft) 29
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
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
Typical Condition 1 Floodplain Expansion 32 Creek er
Typical Raise-Grade 33 Creek er
Concept Examples 34 Creek er
35 Creek er
36 Creek er
37 Creek er
38 Creek er
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 0.63 16.5 Metzenbaum Park 1.51 19 Laurel School #1 3.02 38.3 Laurel school #2 3.02 49.6 Hillbrook Club 6.51 100.2 Bowen Dam 6.64 75.3 39
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
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
Questions Joel Bingham, Restoration Manager ver er Partners, Inc. Amy Brennan, Director Keely Davidson-Bennett, Program Associate 42
Extra 43 Creek er
The Club at Hillbrook 44 Creek er
Geauga Park District s Bessie Benner Metzenbaum Park Creek ver Re attach floodplain Raise grade Create floodplain and stormwater Storage Public Land 45
Tree Falls Bookman Bookman 46 Creek er