[Code of Federal Regulations]

[Title 33, Volume 3]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 33CFR208.22]



[Page 128-129]

 

                TITLE 33--NAVIGATION AND NAVIGABLE WATERS

 

 CHAPTER II--CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF 

                                 DEFENSE

 

PART 208_FLOOD CONTROL REGULATIONS--Table of Contents

 

Sec.  208.22  Twin Buttes Dam and Reservoir, Middle and South Concho 

Rivers, Tex.



    The Bureau of Reclamation, or its designated agent, shall operate 

the Twin Buttes Dam and Reservoir in the interest of flood control as 

follows:

    (a) Whenever the Twin Buttes Reservoir level is between elevations 

1,940.2 (top of conservation pool) and elevation 1,969.1 (top of flood 

control pool) the flood control discharge facilities shall be operated 

under the direction of the District Engineer, Corps of Engineers, 

Department of the Army, in charge of the locality, so as to reduce as 

much as practicable the flood damage below the reservoir. All flood 

control releases shall be made in amounts which, when combined with 

releases from San Angelo Reservoir on the North Concho River and local 

inflow below the dam, will not produce flows in excess of bankful 

capacities on the South Concho and Concho Rivers downstream of the 

reservoir. In order to accomplish this purpose, flows shall not exceed a 

22.5-foot stage (25,000 c.f.s.) on



[[Page 129]]



the USGS gage on the Concho River near San Angelo, Tex. (river mile 

60.9); or a 22.8-foot stage (25,000 c.f.s.) on the USGS gage near Paint 

Rock, Tex. (river mile 19.6).

    (b) When the Twin Buttes Reservoir level exceeds elevation 1,969.1 

(top of flood control pool), releases shall be made at the maximum rate 

possible and continued until the pool elevation recedes to elevation 

1,969.1 when releases shall be made to equal inflow or the maximum 

release permissible under paragraph (a) of this section, whichever is 

greater.

    (c) The representative of the Bureau of Reclamation in immediate 

charge of operation of the Twin Buttes Dam shall furnish daily to the 

District Engineer, Corps of Engineers, Department of the Army, in charge 

of the locality, a report, on forms provided by the District Engineer 

for this purpose, showing (1) for Twin Buttes Reservoir, the elevation 

of the reservoir level; number of river outlet works gates in operation 

with their respective openings and releases; uncontrolled spillway 

releases; storage; reservoir inflow; available evaporation data; and 

precipitation in inches; and (2) for Nasworthy Reservoir, the elevation 

of the reservoir level; irrigation outlet works and controlled spillway 

releases; storage; tailwater elevation; and reservoir inflow. Normally, 

one reading at 8 a.m. shall be shown for each day. Readings of all items 

except evaporation shall be shown for at least three observations a day 

when the Twin Buttes Reservoir level is above elevation 1,940.2. 

Whenever the Twin Buttes Reservoir level rises to elevation 1,940.2 and 

releases for flood regulation are necessary or appear imminent, the 

Bureau representative shall report at once to the District Engineer by 

telephone or telegraph and, unless otherwise instructed, shall report 

once daily thereafter in that manner until the reservoir level recedes 

to elevation 1,940.2. These latter reports shall reach the District 

Engineer by 9 a.m. each day.

    (d) The regulations of this section insofar as they govern use of 

the flood control storage capacity in Twin Buttes Reservoir above 

elevation 1,940.2 are subject to temporary modification in time of flood 

by the District Engineer, if found desirable on the basis of conditions 

at the time. Such desired modifications shall be communicated to the 

representative of the Bureau of Reclamation in immediate charge of 

operations of the Twin Buttes Dam by any available means of 

communication and shall be confirmed in writing under date of the same 

day to the Regional Director in charge of the locality, with a copy to 

the representative in charge of the Twin Buttes Dam.

    (e) Flood control operation shall not restrict releases necessary 

for municipal, industrial, and irrigation uses.

    (f) Releases made in accordance with the regulations of this section 

are subject to the condition that releases shall not be made at rates or 

in a manner that would be inconsistent with emergency requirements for 

protecting the Twin Buttes Dam and Reservoir from major damage or 

inconsistent with safe routing of the inflow design flood (spillway 

design flood).

    (g) The discharge characteristics of the river outlet works (capable 

of discharging approximately 32,470 c.f.s. with the reservoir level at 

elevation 1,969.1) shall be maintained in accordance with the 

construction plans (Bureau of Reclamation Specifications No. DC-5274 as 

modified by revised drawings and criteria in Designers' Operating 

Criteria, Twin Buttes Dam, dated February 1963).

    (h) All elevations stated in this section are at Twin Buttes Dam and 

are referred to the datum in use at that location.



[31 FR 12521, Sept. 22, 1966]