StreamStats was developed for Arizona in cooperation with the Bureau of Reclamation, the Flood Control District of Maricopa County, Greenlee County, the Flood Control District of Mohave County, the U.S. Forest Service, the Pima County Regional Flood Control District, Pinal County, Cochise County, Navajo County, the Yavapai County Flood Control District, and the Salt River Project.
New regression equations were made available state-wide in Arizona on June 15, 2017 in StreamStats beta version 4. The new equations can be used for estimating the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual peak-flow exceedance probabilities (2-, 5-, 10, 25-, 50-, 100-, 200-, and 500-year recurrence intervals, respectively), and also the 1-, 3-, 7-, 15-, and 30-day flood-duration flows at the same exceedance probabilities for user-selected ungaged sites. Version 3 is no longer available for Arizona, as a unique method for computing contributing drainage areas for user-selected sites in Arizona sometimes causes delineated basins to appear incorrectly in the version 3 interface.
The reports below document the regression equations available in StreamStats for Arizona, the methods used to develop the equations and to measure the basin characteristics used as explanatory variables in the equations, references to GIS data layers used in the analysis, and the errors associated with the estimates obtained from the equations. Users should familiarize themselves with the reports before using StreamStats to obtain estimates of streamflow statistics for ungaged sites.
- Paretti, N.V., Kennedy, J.R., Turney, L.A., and Veilleux, A.G., Methods for estimating magnitude and frequency of floods in Arizona, developed with unregulated and rural peak-flow data through water year 2010: U.S. Geological Survey Scientific Investigations Report 2014-5211, 55 p.
- Kennedy, J.R., Paretti, N.V., and Veilleux, A.G., 2014, Methods for estimating magnitude and frequency of 1-, 3-, 7-, 15-, and 30-day flood-duration flows in Arizona: U.S. Geological Survey Scientific Investigations Report 2014–5109, 35 p.
Click on this link to obtain general information on the Arizona application, as well as specific sources and computation methods for basin characteristics.
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Methods for estimating magnitude and frequency of floods in Arizona, developed with unregulated and rural peak-flow data through water year 2010
Methods for estimating magnitude and frequency of 1-, 3-, 7-, 15-, and 30-day flood-duration flows in Arizona
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Methods for estimating magnitude and frequency of floods in Arizona, developed with unregulated and rural peak-flow data through water year 2010
Flooding is among the worst natural disasters responsible for loss of life and property in Arizona, underscoring the importance of accurate estimation of flood magnitude for proper structural design and floodplain mapping. Twenty-four years of additional peak-flow data have been recorded since the last comprehensive regional flood frequency analysis conducted in Arizona. Periodically, flood frequeMethods for estimating magnitude and frequency of 1-, 3-, 7-, 15-, and 30-day flood-duration flows in Arizona
Large floods have historically caused extensive damage in Arizona. Although peak-flow frequency estimates are required for managing the risk posed by floods, estimates of the frequency of sustained flood flow (flood-duration flow) are also useful for planning and assessing the adequacy of retention and conveyance structures and for water-resource planning. This report presents a flood-duration flo - Partners