Texas Register, Volume 11, Number 19, Pages 1163-1244, March 11, 1986 Page: 1,181
1163-1244 p. ; 28 cm.View a full description of this periodical.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
IOTt fe flood hydrograph in this table is the miniun required flood for a
given project, i.e., the project w411 be required to safely pass this hydrograph.
here a range is given, the minima flood hydrograph will be determined by
straight line interpolation within the given range. Intrpolation shall be based
on either hydraulic height or apoundnent size (5299.12, Table 1 of this title
(relating to Size Classification Criteria)), whichever is greater. The miniauma
flood hydrograph is computed as a percentage of the RU hydrograph.1299.15. Evaluation of Existing Dams.
(a) Periodic re-evaluation of existing
dams. Existing dams, as defined in 1299.1
of this title (relating to Definitions), are sub-
ject from time to time to re-evaluation in
consideration of continuing downstream de-
velopment. Hydrologic criteria contained in
1299.14, Table 3 of this title (relating to Hy-
drologic Criteria for Dams) are the minimum
acceptable spillway evaluation flood (SEF)
for re-evaluating dam and spillway capacity
for existing dams to determine whether up-
grading is required. Dams not meeting min-
imum criteria are considered to be below ac-
ceptable limits and are subject to action as
necessary under 299.2 of this title (relating
to General).
(b) Exemptions from minimum hydro-
logic criteria. Existing low hazard dams are
exempt from the minimum hydrologic cri-
teria as given in Table 3 and any other ex-
isting structure may be exempt from the min-
imum hydrologic criteria if properly pre-
pared dam breach analyses show that exist-
ing downstream improvements or known or
planned future improvements will not be
adversely affected. A properly prepared
breach analysis should include at least three
events, the normal storage capacity nonflood
event, the barely overtopping event, and thePMF event. Data on additional flood mag-
nitudes may be provided as necessary to
document other conditions or conclusions.
Downstream flooding differentials of one-
foot or less between breach and nonbreach
simulations are not considered to be adverse.
(c) Structural evaluation. Evaluating
the structural condition of an existing dam
includes, but is not limited to, visual inspec-
tions and evaluations of potential problems
such as seepage, cracks, slides, conduit and
control malfunctions, and other structural
and maintenance deficiencies which could
lead to failure of a structure. An active and
progressive deteriorating condition is suffi-
cient for a finding that an existing dam is
structurally inadequate.
299.16. Interim Altewnati. At the time
the commission considers the permanent up-
grading or removal of an inadequate dam,
the dam owner may request the commission
to consider interim alternatives including, but
not limited to temporary repairs, reservoir
dewaeang, insurance coverage, andor down-
stream warning and evacuation plans. Con-
sideration shall be given to the time required
to overcome edbnomic, physical, and legal
restraints to upgrading, the prospect of per-
manent repair, current use of the facility,
degree of risk, and public welfare.1299.17. ABerge cy Management. As re-
quired for emergency management planning,
the executive director may request and/or the
commission may order, a da&. owner to pro-
vide sufficient data to plan for potential ef-
fects of failure or malfunction of a dam
and/or associated appurtenant facilities.
299.18. Variance. The owner of an ex-
isting dam that does not meet the hydrologic
criteria of $299.14, Table 3 of this title
(relating to Hydrologic Criteria for Dams)
may request the commission to consider a
variance from this criteria, based upon, but
not limited to, the owner's evaluation of the
consequences of potential dam failure, pro-
posals to reduce potential hazard, and/or the
economic and physical limitations to up-
grading.
Issued In Austln, Txas, on February 26, 196.TRD0801961
Jams K. Rourke, Jr.
General Counsel
TOM Water CommissionEffective date: March 3, 196
Expiration date: July 1, 1986
For further Information, please call
(512) 46.3070.Subchapter C. Construction
Requirements
*31 TAC 0299.21-299.31
The new sections are adopted on an erner-
gency basis under the Texas Water Code,
12.052, which provides that the Texas
Water Commission shall adopt any rules
necessary to provide for the safe con-
structlon, maintenance, repair, and re-
mrnvai of dams located In this state.
299.21 Applicability. This subchapter
applies only to engineering plans and speci-
fications for the construction, enlargement,
repair, or alteration of dams requiring com-
mission authorization, except as follows:
(1) exceptions approved in accor-
dance with 299.5 of this title (relating to
Exception);(2) dams designed by and cotruct
under the supervision of federal agencies
such as the Corps of Engineers, Bureau of
Reclamation, and the Soil Conservation
Service.
299M.22. Approval of Plans and SpeiU ca-
1ons. Construction of a dam or the en-
largement, repair, or alteration of an existing
dam requiring commission authorization shall
not be commenced prior to the executive
director's written approval of final construc-
tion plans and specifications. Construction
plans and specifications shall be submitted
to the executive director and shall be as com-
pletely detailed as necessary for submission
to the contractors bidding on the proposal.
Contractors shall not commence construc-
tion until provided with a copy of the plans
and specifications evidencing the approval.This does not apply to ordinary maintenance
or emergency repair. The executive director
may require the filing of additional informa-
tion and data which, in his opinion, may be
necessary for determining the adequacy of
operational functions and safety of the struc-
tures and works related thereto~ The official
name of the dam and reservoir by resolution
of the governing body or by certificate if in-
dividually owned shall be submitted to the
department as early as possible, preferably
with the construction plans.
$299.23. Content of Construction Plans
and Speccations.
(a) Construction plans requiring ap-
proval by the executive director may include
the following, as determined by the execu-
tive director:4 Emrgnc Run Mrh1,186 1 e~g15
__ _ II I I II rl I I I I I I
i Emsergency Ruls
March 11, 1986 11 TaRg 1181
Upcoming Pages
Here’s what’s next.
Search Inside
This issue can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Periodical.
Texas. Secretary of State. Texas Register, Volume 11, Number 19, Pages 1163-1244, March 11, 1986, periodical, March 11, 1986; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth243767/m1/19/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.