EP 1110-2-13
28 Jun 96
Maintenance, and Rehabilitation (REMR) Program
(Lindsey et al. 1986, Keeter et al. 1986, Currier and
seismic activity).
Fenn 1986, O'Neil 1989). Topics covered include
design requirements, signal conditioning and
(9) Weirs, flow meters and flumes to measure
processing, data transmission and reduction, system
seepage clarity and quantity.
installation and maintenance, retrofitting existing
For concrete dams, the types of measurements (and
and software used to drive the automated instruments
instruments) include (EM 1110-2-2200 and
and reduce and report the collected data (U.S. Army
EM 1110-2-4300):
Corps of Engineers 1987). A data base for automated
geotechnical and some structural instrumentation at
(1) Strain and
deflection
(internal
and/or
Federal and non-Federal projects is maintained under
external gages).
the Corps of Engineers Computer Applications in
Geotechnical Engineering (CAGE) Program.
(2) Crack or joint movement (internal and/or
external gages).
the initial project design, or reevaluation in the case of
(3) Stress and pressure (stress meter, pressure
existing structures, the physical properties of the
gage, pressure cell).
construction materials, design data, loading
conditions and the appropriate factors of safety will
(4) Uplift pressure (standpipe and/or diaphragm
be utilized to determine the desired threshold limits
uplift cell, water level indicator).
for the design condition. Quantitative values will be
established for these limits that can be accurately
(5) Hydraulic leakage from foundation drains,
translated into measurements that are readily obtained
joint drains and face drains (v-notch weir and/or
in the field, which will enable the designers and
critical depth meter).
operators to evaluate the behavior and performance of
the structure. The threshold limits along with the
(6) Plumbness and levelness (plumb lines,
predicted performance levels will be addressed in the
optical plummets, electolevel and water level meter).
project instrumentation design memorandum.
General guidance on preparation of the
(7) Alignment, settlement, and distance (laser,
instrumentation design memorandum is given in
theodolite, triangulation, trilateration and electronic
EM 1110-2-2300 and ER 1110-2-110. ER 1110-2-
distance meters).
1925 prescribes the forms to use in recording instru-
mentation observations. Additional information on
(8) Seismic time history and magnitude (strong
C-4. Coordination Between Design and
Construction
thermocouples).
Close coordination between design and construction
c.
Automatic data acquisition. Consideration
personnel is necessary to thoroughly orient the
should be given to providing a computer-based
construction personnel as to the project design intent;
automated data acquisition system (ADAS) to
ensure that new field information, acquired during
provide cost-effective real time data collection from
construction, is assimilated into the design; and
the dam. General guidance for developing an ADAS
ensure that the project is constructed according to the
for earth and rockfill dams is presented in
intent of the design (U.S. Army Corps of Engineers,
Appendix D of EM 1110-2-2300. A comprehensive
Office of the Chief of Engineers 1977).
review of ADAS for concrete structures was made
under the Corps of Engineers Repair, Evaluation,
C-2