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I I I I I I I I I I I I I I I I I I I 5.0 Case Studies 5./ Data Collection and Field Work The original field expedition was made on June 3rd and 4th, 2002. On this trip Tom Browning, Tom Gilman. and Gared Grube traveled to Delta County to meet with community officials for Cedaredge and Delta County and to collect necessary field data. The officials included Gary Noah. Public Works Director for Cedaredge; Duane Freeman, the Emergency Preparedness Coordinator for Della County. In addition. all of the dimensions for the bridges and culverts for the studied stream reaches were measured and recorded. These bridges and culverts were later entered into HEC-RAS for the hydraulic analysis. The data can be viewed by opening the HEC- RAS files obtained on the attached CD. Appendix E gives a description of the information obtained on the disk. The next field expedition was made on June 24th and 25th, 2002 by Tom Gilman and Gared Grube. The purpose of this trip was to survey all of the necessary cross-sections to complete hydraulic analysis for the streams being studied. The cross-sections were surveyed using IDS- Ashteck GPS survey equipment. This equipment consisted of a Z-Xtreme GPS system and a IDS Ranger data collector. The Z-Xtreme (Figure 3), manufactured by A~htech, is a weatherproof dual frequency GPS receiver that produces centimeter accurate positions. An RTK base station (Figure 4), which is a component of the Z-Xtreme package, is set up over a known point that differentially corrects the signal over that point increasing the receiver's accuracy. The TDS Ranger data collector contains a 192 MHz processor and 32 MB of RAM that allows many different capabilities and the storage of large amounts of data. The TDS specifications can be found in Appendix A. The TDS Ranger contains pOTtS that connect directly to a computer and allows fast data transfers. 21