EP 1130-2-500
27 Dec 96
Examples of narrative description that might be used to support the review of current
condition summarized in Table B-1 in Appendix B.
LOCKS
STRUCTURE
CONCRETE:
RELIABILITY - High - Reliability is estimated to be high based on site and annual inspection
records which do not identify any problem areas. Beta was not computed and no further analysis
was performed.
****alternately****
RELIABILITY
SUMMARY ASSESSMENT - POOR - The lock wall concrete was identified as the
critical problem and the assessment was supported by the reliability analysis. Records show
deterioration, cracking, deflection, etc. Lab testing has/has not/can/cannot, etc. be/been done.
CURRENT BETA - a beta of __ was computed and is consistent with the records on this
and similar structures.
CAUSE - the low reliability/deteriorated condition is due to freeze-thaw, alkaline
reactivity and erosion due to barge impacts.
FUTURE BETA - the beta is expected to /remain constant/ decrease at a constant rate of
___/decline at an increasing rate of ___ due to the barge impacts over the next ___ years.
UNSATISFACTORY PERFORMANCE
MODE - the wall could exhibit unsatisfactory performance several ways: excessive
deflection, deteriorate slowly requiring patching at an increasingly frequent rate, slide slowly or
rapidly without warning.
IMMEDIATE CAUSE - a number of immediate causes are possible: tow impact, ice, loss
of foundation materials. The immediate cause will be directly related to the mode of
unsatisfactory performance and its likely consequences.
CONSEQUENCES - The possible consequences range from need for repair during low
use periods to a complete loss of locking capability for up to 6 months.
ASSESSMENT
PROBABLE ACTION - continue annual inspection program/ intensify inspections/
schedule detail testing in 10 yr program because....
ESTIMATED TIME - immediately/ 2 years/ 10 years because of the high probability and
low consequences .....
G-3
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