Dear Mr. Albright,

This responds to your request under the Freedom of Information Act (FOIA) below dated August 21, 2013. 

TVA does not currently use the “Sliding Gate Method” for hydro testing.  TVA tried this method about 6-7 years ago, but abandoned it because it was not successful.  No TVA test report on the sliding gate method was completed.  We may possibly still have the raw test data, but expect it will take several hours to search for it resulting in a fee of several hundred dollars for search and review time.

If you would like to pay fees for processing your request, please let me know.  We will require an advance payment before we can begin processing.  See TVA’s FOIA regulations at 18 C.F.R. § 1301.10 for information on Fees.

If you have questions, you may contact me at (865) 632-6945.



Denise Smith

FOIA Officer

Tennessee Valley Authority

400 W. Summit Hill Drive (WT 7D)

Knoxville, TN 37902-1401


(865) 632-6901 FAX



From: []
Sent: Wednesday, August 21, 2013 10:57 AM
Subject: FOIA request for Sliding Gate data.


TVA FOIA Officer
Denise Smith
400 West Summit Hill Dr. WT 7D
Knoxville, TN 37902-1499
865-632-6945 (voice)
865-632-6901 (fax)

Dear Ms. Smith,

Under the Freedom of Information Act/Presumption of Openness, I am requesting technical information about Kaplan hydroelectric turbine efficiency performance testing.

TVA hydro turbine testing group has developed the “Sliding Gate Method” for collecting field test data from hydroelectric turbines. During this test, the hydroelectric unit is started up and it's power and flow are ramped up and down very slowly while data is being recorded. By averaging the up and down sweep data an average performance profile is acquired.

For Kaplan units, setting an offset bias on the blades at a number of values for subsequent sweeps will provide "off-cam" data that can be used to redefine the blade control's head and gate to blade data profile to increase operating efficiency of the turbine.

Can I please have some sample data from this testing and a TVA test report that explains how this information is analyzed and utilized? Data should, but not necessarily include trashrack loss, forebay level, tailwater level, gate opening, blade angle, flow (Winter Kennedy or other flow signal) and power.

Please provide this information in electronic format (email the data files or on a CD) that can be read into my computer so my turbine analysis program can be modified to input, interpret and analyze this data.

Thank you,

Douglas Albright – President

Actuation Test Equipment Company