South Platte River Basin District 1 Diversion Sturcture Invento

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,FebruaJY 20, 2004 South Platte River Basin District 1 Diver,,\'ion Structure Inventory 1.0 INTRODUCTION The South Platte River Basin, District 1 Diversion Structure Inventory project is the second phase of a pilot project, in which Farnsworth Group was retained by the Colorado Water Conservation Board (eWCS) to evaluate and document the condition of raw water diversion structures along the South Platte River from Denver to the Nebraska state line. The District 2 study extended from the Denver Gage to Greeley, and included the evaluation of 22 diversion structures (refer to Section 6.0, "References"). District 1 extends from Greeley to the Balzac Gaging Station near the Morgan-Washington county line. See Appendix A for a summary of all structures evaluated for District 1, including ditch owner/rider contact information, detailed directions and coordinates to, and condition of, each structure. 2.0 RESEARCH AND PLANNING An initial condition report, structure names, directions to each diversion, GPS location and contact information were provided by the CWCB" After reviewing this information, each structure's GPS location was plotted on U.S"G.S" Quadrangle Maps" These maps, in conjunction with a Colorado Atlas and the directions provided, were used to identify the locations and to plan an efficient route to each structure. In order to organize the notes taken during the field observation process, a Field Inventory form (previously created for District 2 structure evaluation) was utilized. This form allowed the observer to record detailed directions, coordinates, the type of structure, its condition, repair(s) needed, specific ideas on how to repair and any additional comments. 3.0 FIELD INVENTORY 3.1 General Once a structure was physically located, the approximate coordinates (latitude and longitude) of the diversion headwall were recorded using a hand-held GPS locator. Photographs were taken showing all the components of the structure from different vantages, visible damage, upstream and downstream river/ditch configurations, etc. The components of a structure would typically include: A. Diversion - Concrete structure used to divert water from the South Platte River to each ditch at a controlled rate (specific flow) by means of a headgate. The headgate is typically a manually, mechanically or electrically operated radial or vertical lift gate(s). The structure also consists of a headwall, wingwalls, concrete apron (floor), trash guard/rack, and decking (concrete or timber) with handrail for access/maintenance. B" Regulator Gate - Structure used to control the approach elevation of the river, and therefore how much water can be diverted. Consists of a headwall, wingwalls, piers, apron, manually, mechanically or electrically operated radial or vertical lift gate(s), stairs and decking (concrete or timber) with handrail for access/maintenance. The regulator gate is commonly connected to the Farnsworth Group Page 1