Professional Engineering Problems, Recreation Engineering and Planning

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Mr. Ted Kowalski, CWCB Ms. Angeline Kinnaird, PE Board June 10, 2005 Page 2 of 4 The attached ASCG letter report and Power Point presentation are the key documents provided in our review. Also we have provided a copy of Mr. Lacy's report. The two sketches enclosed outline improvements, but are not suitable in my opinion to suffice as normal, sealed, design and construction documents. We requested CWCB provide engineering analysis, calculations, pre - and post - construction surveys and other documents normally provided as part of standard river engineering, floodplain development, and CWCB guidelines. Apparently none are available or are being provided by Recreation Engineering and Planning. In Mr. Lacy's report, justification, analysis, and engineering rely largely on his experience. No apparent surveying and specific analysis of pre - project and proposed design hydraulics and stability using conventional practices has been conducted. Typically, at minimum, water surface profile analysis is conducted using programs such as the Corp's HECRAS. Further he makes statements about engineering principles and concepts which are misleading and /or wrong. Whitewater hydraulics and river sediment transport and stability analysis is very complicated. Often physical laboratory models are conducted. At minimum, custom calculations to determine three dimensional and special super critical flow situations are conducted. Advanced three dimensional numerical programs are available for this analysis. Essentially nothing significant has been made available, only reference to HECRAS analysis of other projects, which also wasn't provided and is not standard practice for justifying improvements. Of great concern is that no specific analysis has been conducted of the pre - project floodplain conditions, the design, or constructed facilities. In the Salida case, this is onerous because of property and structures immediately adjacent to the river. While Mr. Lacy testified that banks were laid back in certain places and holds the position that the dam structures do not cause a rise in flood levels. This is highly unlikely unless significant excavation of the river bed and enlargement of conveyance has been accomplished. There are no signs that this was analyzed or accomplished. In Golden, the same types of Low Head Dams are used, raising the water levels near municipal and private structures. Further, the structures at Salida and Buena Vista have jets diving to the bottom which can create C13 12596 WEST BAYAUD AVENUE, SUITE 200, LAKEWOOD, CO 80228 303.458.5550 FAX 303.480.9766