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Underwater Bridge Repair Project
Reaches New Customers

	LT Ken Marien (USCG's Civil Engineering Unit) helps instructor Michael Garlich with a classroom demo during the DP 98 workshop held in Miami.

On April 29 and 30, the Office of Technology Applications' (OTA) Demonstration Project 98 (DP 98), Underwater Evaluation and Repair of Bridge Components, began reaching new customers. It was presented to the U.S. Coast Guard's Civil Engineering Unit in Miami, Florida, and to guests of the Coast Guard, which included the Dade County Port Authority and the CSX Railroad. Lieutenant Keith Ingalsby, training officer for the Coast Guard unit, praised the presentation as a good example of interagency cooperation since it gave his unit up-to-date technical information for use in current projects.

It was pointed out during the presentation that evaluation techniques and repair procedures used by bridge engineers are applicable to many types of underwater structures. A pile doesn't care whether it is carrying a bridge or a dock; it sees the same type of load and deterioration.

DP 98 uses a hands-on approach for providing engineers an opportunity to experience some of the latest technologies and repair products for underwater use. It is especially relevant to the States since they have completed several underwater bridge inspections and are now very involved in underwater repairs.

DP 98 is intended for Federal, State, and local engineers responsible for designing, inspecting, and maintaining bridges and related facilities. It has been presented all over the country from Alaska to Texas and Maine to Florida. To schedule a presentation, contact OTA.
- Tom Krylowski, (202) 366-6771.

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Want to Know More About
Highway Hydrology Modeling?

Then check out the Hydraulic Design Series Number 2 (HDS-2), Highway Hydrology. OTA and the Bridge Division have distributed the publication to State highway agencies and FHWA offices. HDS-2 supercedes FHWA's 1984 publication Hydraulic Engineering Circular 19, Hydrology.

HDS-2 discusses the physical processes of the hydrologic cycle that are important to highway engineers and the methods that are used to design highway drainage structures. Hydrologic methods of primary interest are frequency analysis for analyzing gauge station data, empirical methods for estimating peak discharges (e.g. use of regression equations, rational method, or the SCS Graphical method), and hydrograph analysis and synthesis. New topics include arid lands hydrology, stormwater management, and the role of geographic information systems in hydrologic modeling. All equations and computations in the manual are metric.

A new National Highway Institute (NHI) course, Practical Highway Hydrology (Course No. 13067), is being developed using HDS-2 as its primary reference. Additional copies of HDS-2 can be obtained from the Federal Highway Administration, R&T Product Distribution Center, HRTM-03 - E-mail: report.center@dot.gov. The publication number is FHWA-SA-96-067. The manual is also available through the National Technical Information Service (NTIS #PB97-134290).
- Abbi Ginsberg, (202) 366-8080.