Louisville District

cutterhead pressures, suction and discharge pipeline lengths, and the three-dimensional location of

the suction inlet. "This data forms the basis of monitoring the performance and effectiveness of the

dredge under the conditions encountered at the dredge site" (Chapman 1994).

A windows-based microprocessor is required to (a) continuously display parameters on an integrated

video information console and (b) record time-averaged data (converted from analog to digital) on

an interval of not more than 15 sec or as determined by the Government's representative. The

devices or system is to be equipped with an electronically scalable crossed-pointer display indicating

slurry velocity, slurry density, and instantaneous production (see Figure 2) for use by the leverman

and Government's representative or inspector.

Positioning requires a microprocessor-based Differential Global Positioning System (DGPS) capa-

ble of using U.S. Coast Guard/Corps of Engineers DGPS corrections to accurately position and

continuously trace, display, and record the location of the dredge cutterhead during dredging

operations. The minimum system output is to consist of cutterhead location coordinates compatible

with layout maps, cutterhead offset with respect to center line of dredge cut, distance downline from

beginning of the dredge cut, dredge azimuth with respect to Grid North on layout maps, current date

and time, and water-level corrections. The positioning system requirements for quality control