EM 1110-2-2907
1 October 2003
Table 6-2
Factors Important in Levee Stability
Performance history (under flood stage)
Construction history (original or upgraded)
Visual inspection apparent condition (on-site observation)
Material type (sand [worst] transition to clay [best]; (from EM, borings, soil maps)
Topographic irregularity (swags, erosion) (from LIDAR)
Potential slope stability (material type, relation to flow)
Man-made intrusions (utilities, bridges, pump stations, etc.)
Geology (old stream beds, river deposits)
Proximity of borrow area (size, depth, distance, side of levee)
Anomalies (unexplained radical conductivity "spots")
List is modified from Dunbar et al. (2003)
f. Conclusions. LIDAR, accurate to within 2 to 3 in (5.1 to 7.6 cm), was beneficial in
economically mapping the surface morphology of the Lower Rio Grande Valley levee sys-
tem. The merged remote sensing and geophysical data onto a GIS database facilitated easy
retrieval of information for individual segments and can continue to aid in the management
of the levee system. The authors view this study as a success and acknowledge that the ap-
plication of these techniques to other geographical regions, while potentially of benefit, may
not hold true for levee projects in other regions.
Point of Contact: Joseph Dunbar, Phone: (601) 634-3315
6-11 Case Study 9 : From Wright Flyers to Aerial Thermography--The 1910
Wright Brother's Hangar at Huffman Prairie
Subject Area: Archeology
Purpose: To review developing NASA products and detail their use in Corps
works
Data Set: Airborne CAMS
a. Introduction.
(1) The Huffman Prairie Flying Field, a National Historic Landmark located at
Wright-Patterson Air Force Base, was surveyed using a variety of ground and airborne sen-
sors in an effort to locate the forgotten Wright Brother's hanger. This hangar, in use from
1910 to 1916, was the training and testing site for the Wright Aeronautical Company activi-
ties. The hanger was demolished during the 1940's with no record of its precise location.
(2) In the early 1990s, CERL researchers investigated the Huffman Prairie Flying
Field using traditional and common archeological methods, such as excavation, magnetic
and electromagnetic surveys, and ground penetrating radar (GPR). NASA aided CERL's
effort with the addition of thermal data collected from an airborne platform. The airborne
6-19
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