Stream

Lake

Rock Type in Profile

Whole Catchment Size (km2)

Stream Length (km)

Knickpoint Distance (m)

Catchment Area at Knickpoint (km2)

Knickpoint Lithology

Comments

Dg, Ds, Djwl

Eggleston

Keuka E

Ds, Djwl

7.4

6.44

1354

7.1

Ds

Falls appear to occur at contact; no Dg in stream profile.

Excelsior

Seneca E

Dg; Ds and Djwl

5.9

5.92

686

2.9

Dg

Falls are 30 m below Dg/Ds contact in stratigraphic section (according to map; Fisher et al., 1961). Multiple falls occur after small flat portion of profile, almost at the end of Seneca Lake, which is fill deposits. (Dr, Djwl not observed in field.)

Glenwood

Cayuga W

Dg; Ds

3.5

9.16

235

3.5

Dg

Multiple falls all the way up to regional plateau, in steps upstream of delta deposits. (Ds not observed in field.)

Hector

Seneca E

Dg; Ds

31.2

14.91

114

31.2

Dg

Large steep falls at bottom, solidly in Dg; Ds marks the plateau beginning, observed in Burdett.

Inwood Pt.

Seneca W

Dg, Ds, Djwl

2.5

7.04

121

269

2.5

2.4

Dg

Dg

Almost meets Rock Stream; delta deposit and then flat to first shaly falls, then steps of falls.

Rock

Seneca W

Dg, Ds, Djwl

17.6

13.26

101

575

17.6

17.2

Dg

Dg

This falls has a keyhole ampitheater, plus "chainsaw" knickpoints.

(Dhu), Dt, Dg, Ds

Atwater

Cayuga E

Dhu, Dt, Dg

6.97

7.13

1183

415

6.4

6.6

Dt

Dhu

Two knickpoints, or split knickpoint?

Plum Pt

Seneca W

Dt, Dg, Ds

12.7

11.26

1593

8.4

Dg

Plum Point starts in Tully ls

Willow

Cayuga W

Dhu, Dt, Dg, Ds

9.0

10.86

579

8.7

Dt

South of Taughannock, down stratigraphic section.

Taughannock

Cayuga W

Dhu, Dt, Dg, Ds +fill

43.9

19.59

1581

43.5

Dg

Tully ls at very base; falls are 215 feet.

Groves and Powell

Cayuga W

Dhu, Dt, Dg

12.98

        

Total catchment area for both Groves and Powell

Groves

    

5.6

8.71

696

5.5

Dhu

Given area is Groves branch only, but length is complete. A second knickpoint appears on stream profile from DEM at ~1600, at the bottom of Dt (Tully).

Powell

    

7.3

7.74

1518

5.7

Dhu

Given area is Groves branch only, but length is complete. No obvious second knickpoint at Dt (Tully).

Stream

Lake

Rock Type in Profile

Whole Catchment Size (km2)

Stream Length (km)

Knickpoint Distance (m)

Catchment Area at Knickpoint (km2)

Knickpoint Lithology

Comments

(Dhu), Dt, Dg, Ds cont.

Kashong

Seneca W

Dhu, Dt, Dg

75.8

24.83

2286

69.9

Dhu

Double falls at knickpoint.

Mill Creek

Seneca E

Dhu, Dt, Dg, Ds

19.1

12.69

2040

17.3

Dt

Silver Thread Falls

Dhl, Dhu, Dt, Dg

Big Hollow

Cayuga W

Dhl, Dhu (no Dt or Dg)

4.8

6.45

697

57.7

Dhl

  

Little

Cayuga E

Dhl, Dhu, Dt, Dg

7.6

9.28

1234

4.1

Dhl

Both knickpoints for Little and Paines occur at the top of Dhl, close to the contact with Dhu.

Paines

Cayuga E

Dhl, Dhu, Dt, Dg

39.6

15.14

2055

35.7

Dhl

  

Sampson

Seneca E

Dhl, Dhu (no Dt or Dg)

7.1

6.58

979

6.7

Dhu

This small knickpoint indicated on profile at the Dhu/Dhl contact may not have been observed in the field.

 

*I've had to X100 for those catchments determined with an earlier version of Colin's program. Original values in other pages are in 10 m/pixel.

(See orig. data; some have 3 pixel, some have 300 m^2 area cutoffs)

GENERAL THOUGHTS: Okay, according to these profiles, it's lithology and basin size that are potentially controlling the knickpoints. Inwood and Glenwood are most alike, in size and profile. In person, they look pretty different in some spots, but in general, the knickpoint steps are quite similar and occur at resistant (massive) beds. Do I have pictures that show this? Two major steps, at 160 and 210 m elev (1000 and 2000 m upstream) for Atwater and Willow; only one for Plum at 175 m elev, 2000 m in. This speaks to knickpoint control by lithology
             

m to ft

File

          

Quads

39 inches in 1 m

Eggleston.1: 10

  

2.70E+01

322

    

Keuka Park

1000 cm = 39 inches

Excelsior.1: 10

  

8.70E+01

3.03E+02

    

Burdett

3.25

SWCayuga.4: 10

  

6.01E+02

5.00E+01

    

Ithaca West

1522.5

Hector.1.dat

  

6.00E+00

5.50E+02

    

Burdett

  

HollowRun.2:10

  

6.47E+02

1.16E+02

    

Reading Center

10 m X 10 m = 100 m^2; 1000 m X 1000 m = 1000000 m^2 = 1 km^2
               

Rock.1:10

  

8.31E+02

1.05E+02

    

Reading Center (the town of Glenora is in Dundee; Glenora Falls is on Big Stream, the catchment of which runs into Dundee)

  
               
               
               
               

Elmwood.1.dat:10

  

1.42E+02

4.97E+02

    

Sheldrake, Genoa

  
               

Plum.1:10

  

9.97E+02

2.56E+02

    

Dundee

  

Willow.1:10

  

4.85E+02

6.00E+00

    

Ludlowville, Ithaca West

  

Taugh.1.dat

1.00E+00

1.23E+03

9.50E+01

NOT FULL CATCHMENT SIZE

  

Ludlowville, Trumansburg

  
               

Groves.1:10

  

8.20E+02

1.12E+02

    

Sheldrake, Ovid

  
               
               

Kashong.1:10

1.00E+00

1.26E+03

6.90E+02

75800000

  

Geneva South, Stanley

  
           

Lodi

  
               
               
               

HollowHicks.3:10

  

6.91E+02

5.62E+02

    

Ovid

  

Little.3:10 New

  

1.40E+01

7.80E+01

    

Sheldrake, Genoa

  

Paines.1:10

  

3.70E+01

3.20E+01

    

Sheldrake, Genoa

  

Sampson.1:10

  

8.20E+01

1.44E+02

    

Dresden