Definitions and Explanations

Definitions

Bottom of Active Elevation: The lowest water elevation reached in a reservoir under normal operations.

Top of Active Elevation: The highest water elevation reached in a reservoir under normal operations.

Stream Bed Elevation: The elevation of the original stream or river channel.

Maximum Water Surface: The highest water elevation anticipated to be reached in a reservoir under
probable maximum flood conditions.

Explanations

1) Data Sheets are provided for the facilities operated and maintained by the Central Utah Water Conservancy District. Facilities not currently operated by the District include Alpine Aqueduct Reaches 2 and 3 (operated by Orem City); Reach 2B (operated by Provo City); Jordan Aqueduct Reaches 1, 2, 3, and 4 (operated by
the Jordan Valley Water Conservancy District); and the Jordan Valley Water Treatment Plant (also operated by the Jordan Valley Water Conservancy District).

2) The data sheets for the dams each show a cross section or profile of the structure. On the cross section, the right most distance measurement (line between two arrows) indicates distance in feet from the top of the dam to the lowest point in the structure. A zig-zag on the line indicates that the cross section is not to scale for that measurement. The second distance measurement from the right indicates distance in feet from the top of the dam to stream bed elevation.

3) The data sheets for the zoned earthfill dams show numbers enclosed in circles in various positions within the cross sections of the dams. These numbers refer to a zone. A zone is a gradation or specification of material used to construct the structure at the location or area indicated. Zone 1 material always forms the
impervious core of the dam and is composed of selected clays. Zone 5, as used on the cross sections shown in this report, designate slope protection or rip-rap. Other zones are defined differently for different dams. Usually, increasing zone numbers mean increasing sizes of processed sand, gravels, and cobbles. For
Jordanelle Dam, zone 2 is filter material, zone 3 is drain material, and zones 4 and 4a are composed of materials processed to form the main mass of the dam.