Publisher's Synopsis
Excerpt from Streamflow Characterization at Zion National Park, Utah
The purpose of this study is to provide a comprehensive description of the hydrological characteristics of surface runoff at Zion National Park and surrounding watersheds. The analysis is focused mainly on the North Fork of the Virgin River which traverses across the most popular portion of the National Park. The study is also extended, although in less detail, to other streams in the area such as the East Fork of the Virgin River, La Verkin Creek, North Creek, and Kolob Creek, all part of the same hydrologic region. The discussions presented in this report are aimed at providing the reader with an in-depth understanding of the structure of surface ?ow in the region, as well as the causal factors for their characteristics. Time series of surface runoff are analyzed at annual, monthly, and daily time intervals. The narrative description of the findings is accompanied by several graphs and tables.
The report is organized in the following manner. Chapter 2 defines the general area of interest for the study and provides basic physical information of the streams network. Chapter 3 summarizes all the existing records of surface water within the area of interest Chapter 4 provides an in-depth characterization of the flow regime of the North Fork of the Virgin River, covering the structural aspects of flow time series at several time intervals; Chapter 4 also presents the bulk of the results of the study. Chapter 5 concentrates on the distribution of flood events in the North Fork of the Virgin River and the frequency analysis of high and low-?ow variables. Finally, Chapter 6 provides a sense of the variability of ?ows at the North Fork of the Virgin River by means of ?ow duration analysis. Chapter 6 also introduces a parametric flow duration analysis for the whole Zion region that has the potential to estimate ?ow availability and variability at any ungaged site in the region. Appendixes I and II contain results from computations introduced in Chapter 4.
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