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Mr. Ted Kowalski, CWCB <br />Ms. Mgeline Kinnaird, PE Board <br />June 10, 2005 <br />Page 2 of 4 <br />The attached ASCG letter report and Power Point presentation are the key documents provided in <br />our review. Also we have provided a copy of Mr. Lacy's report. The lwo sketches enclosed outline <br />improvements, but are not suitable in my opinion to suffice as normal, sealed, design and <br />construction documents. We requested CWCB provide engineering analysis, calculations, pre- <br />and post- constniction surveys and other documents normally provided as part of standard river <br />engineering, floodplain development, and CWCB guidelines. Apparently none are available or are <br />being provided by Recreation Engineering and Planning. <br />In Mr. Lacy's report, justificaGon, analysis, and engineering rely largely on his experience. No <br />apparent surveying and specific analysis of pre-project and proposed design hydraulics and <br />stability using conventional practices has been conducted. Typically, at minimum, water surface <br />profile analysis is conducted using programs such as the Corp's HECR,4S. Further he makes <br />statements about engineering principles and concepts which are misleading andlor wrong. <br />Whitewater hydraulics and river sediment transport and stability analysis is very complicated. <br />Often physical laboratory models are conducted. At minimum, custom calculations to determine <br />three dimensional and special super critical flow situations are conducted. Advanced three <br />dimensional numerical programs are available for this analysis. Essentially nothing significant has <br />been made available, only reference to HECRAS analysis of other projects, which also wasn't <br />provided and is not standard practice for justifying improvements. Of great concem is that no <br />specific analysis has been conducted of the pre-project floodplain conditions, the design, or <br />constructed facilities. In the Salida case, this is onerous because of property and stnictures <br />immediately adjacent to the river. While Mr. Lacy tesGfied that banks were laid back in certain <br />places and holds the position that the dam structures do not cause a rise in flood levels. This is <br />highly unlikely unless significant excavation of the river bed and enlargement of conveyance has <br />been accomplished. There are no signs that this was analyzed or accomplished. In Golden, the <br />same types of Low Head Dams are used, raising the water levels near municipal and private <br />structures. <br />Further, the structures at Salida and Buena Vista have jets diving to the bottom which can create <br />—I� <br />12596 WEST BAYAUD AVENUE, SUITE 200, LAKEWOOD, C080228 <br />303.458.5550 FA%303.480.9756 <br />