Name:   RodBillett - Subject:   Rule Curve Date:   3/19/2021 7:40:51 AM

Copied it straight from the FERC License...  Copied article 402 below, the entire license is located here.  (look at the document to see the 3 curves on a chart)

https://elibrary.ferc.gov/eLibrary/idmws/file_list.asp?accession_num=20151217-3024

Article 402. Lake Martin Water Level Management. The licensee must operate
the Martin Dam Project in accordance with the guide curves and elevations shown in the
figure below and described herein to protect the ecological and recreational values of
Lake Martin and provide for flood control and downstream navigation:
Document Accession #: 20151217-3024 Filed Date: 12/17/2015
Project No. 349-173 - 81 -
Flood Control Curve. The flood control curve reflects the maximum elevation at
which the lake may be maintained before implementing the flood control
provisions in Article 404. On January 1, the curve is at elevation 484 feet mean
sea level (msl) and remains at this elevation until February 28, when filling
begins. The curve gradually rises until it reaches elevation 491 feet msl on
April 28. The curve remains at 491 feet msl until September 2, then is gradually
lowered to 484 feet msl by the third week in November, and remains at 484 feet
msl until December 31, except when the conditional fall extension is implemented.
Conditional Fall Extension. If the conditions specified in Article 403 are met,
the flood control curve remains at 491 feet msl to October 15; thereafter the flood
control curve gradually declines until it reaches elevation 484 feet msl by the
third week in November, and remains at 484 feet msl until December 31.
Operating Curve. The area between the flood control curve and operating curve
represents the range in which the lake must be maintained under normal flow
conditions. On January 1, the curve is at elevation 480 feet msl and gradually
rises to elevation 483 feet msl by the middle of March. The curve then gradually
rises to elevation 487 feet msl by April 3, 490 feet msl by May 1, and remains at
490 feet msl until July 7. On July 7, the curve begins declining to 489.7 feet msl
Document Accession #: 20151217-3024 Filed Date: 12/17/2015
Project No. 349-173 - 82 -
by August 1, 486.9 feet msl by October 1, 486 feet msl by November 1, 483 feet
msl by November 20, and 480 feet msl by December 31.
Drought Curve. Reservoir elevations below the drought curve generally indicate
that Lake Martin is in drought condition and the drought management provisions
of Article 405 may need to be implemented. On January 1, the curve is at
elevation 480 feet msl and remains at this elevation until March 1. On this date
the curve gradually rises to elevation 487 feet msl by May 1, then gradually lowers
to elevation 480 feet msl by October 1. The curve remains at elevation 480 feet
msl October 1 through December 31.
To the extent possible, the licensee must maintain the lake level between the flood
control and operating curves, except as provided in Article 404 for flood control and
Article 405 for drought management.
The licensee must notify the Commission when Lake Martin is at or below
488 feet msl for a consecutive 7-day period between June 1 and Labor Day, or 2 feet
below the operating curve for a consecutive 7-day period between Labor Day and May
31.
To the extent possible and in coordination with weather conditions, the licensee
must lower the reservoir to elevation 481 feet msl every 6 years, beginning in 2021,
between the third week of November and February 28, to enable the construction and
maintenance of shoreline structures. The licensee must provide public notice at least
30 days in advance of the draw down, and file documentation of the public notice with
the Commission prior to the drawdown.
The lake level requirements may be temporarily modified if required by operating
emergencies beyond the control of the licensee, and for short periods upon mutual
agreement among the licensee, the U.S. Army Corps of Engineers, Alabama Department
of Environmental Management, and Alabama Department of Conservation and Natural
Resources. If the lake level is so modified, the licensee must notify the Commission in
writing as soon as possible, but no later than 10 days after each such incident, and must
provide the reason for the change in lake levels.