buffalo national river: water levels by: cody hudson ce 397 statistics in water resources university...

Buffalo National River: Water Levels

By: Cody Hudson

CE 397 Statistics in Water ResourcesUniversity of Texas-Austin

Buffalo National River

Location

Floating Season

Water Level Trends

Correlation

Only a short 10 hour drive!

Location

My Home

Why the Buffalo River?

Gauging Station

Gauge Heights

dx/dy=0 Day of Year Calendar Day

High Flow 85.03 March 25th

Low Flow 238.07 August 25th

y=2 ft Day of Year Calendar DayEnd of Season 179.55 June 28thStart of Season 297.33 October 23rd

Gauge Heights

dx/dy=0 Day of Year Calendar Day

High Flow 92.73 April 2nd

Low Flow 242.06 August 29th

y=3.6 ft Day of Year Calendar DayEnd of Season 215.72 August 3rdStart of Season 268.77 September 25th

-Trends

• Climate Change• Personal Accounts• Gauge Data

-Trends

Parametric Non-Parametric

-Trends-Increase of 1.133 cfs/year

-Increase of 0.454 cfs/year

-Trends

SAS Results for Annual Log Flow vs. Time

Test Result P-Value

Pearson's 0.05475 0.6550

Kendall 0.01503 0.8561

Spearman 0.04088 0.7387

-High P-Value, so Null Hypothesis is not rejected and Flow is NOT dependent on Time.

-Trends-Decrease of -1.067 cfs/year

-Decrease of -0.736 cfs/year

-Trends

SAS Results for August Log Flow vs. Time

Test Result P-Value

Pearson's -0.2467 0.0410

Kendall -0.16189 0.0502

Spearman -0.2405 0.0465

-Small P-Value, so Null Hypothesis is rejected

and Flow IS dependent on Time.

Was I right?

Questions?

-Correlation

-Correlation