150 resultados para CENTER 26-YEAR EXPERIENCE
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Audit report on Grundy County, Iowa for the year ended June 30, 2014
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Audit report on Washington County, Iowa for the year ended June 30, 2014
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Audit report on Ringgold County, Iowa for the year ended June 30, 2014
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A statewide study was performed to develop regional regression equations for estimating selected annual exceedance- probability statistics for ungaged stream sites in Iowa. The study area comprises streamgages located within Iowa and 50 miles beyond the State’s borders. Annual exceedanceprobability estimates were computed for 518 streamgages by using the expected moments algorithm to fit a Pearson Type III distribution to the logarithms of annual peak discharges for each streamgage using annual peak-discharge data through 2010. The estimation of the selected statistics included a Bayesian weighted least-squares/generalized least-squares regression analysis to update regional skew coefficients for the 518 streamgages. Low-outlier and historic information were incorporated into the annual exceedance-probability analyses, and a generalized Grubbs-Beck test was used to detect multiple potentially influential low flows. Also, geographic information system software was used to measure 59 selected basin characteristics for each streamgage. Regional regression analysis, using generalized leastsquares regression, was used to develop a set of equations for each flood region in Iowa for estimating discharges for ungaged stream sites with 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities, which are equivalent to annual flood-frequency recurrence intervals of 2, 5, 10, 25, 50, 100, 200, and 500 years, respectively. A total of 394 streamgages were included in the development of regional regression equations for three flood regions (regions 1, 2, and 3) that were defined for Iowa based on landform regions and soil regions. Average standard errors of prediction range from 31.8 to 45.2 percent for flood region 1, 19.4 to 46.8 percent for flood region 2, and 26.5 to 43.1 percent for flood region 3. The pseudo coefficients of determination for the generalized leastsquares equations range from 90.8 to 96.2 percent for flood region 1, 91.5 to 97.9 percent for flood region 2, and 92.4 to 96.0 percent for flood region 3. The regression equations are applicable only to stream sites in Iowa with flows not significantly affected by regulation, diversion, channelization, backwater, or urbanization and with basin characteristics within the range of those used to develop the equations. These regression equations will be implemented within the U.S. Geological Survey StreamStats Web-based geographic information system tool. StreamStats allows users to click on any ungaged site on a river and compute estimates of the eight selected statistics; in addition, 90-percent prediction intervals and the measured basin characteristics for the ungaged sites also are provided by the Web-based tool. StreamStats also allows users to click on any streamgage in Iowa and estimates computed for these eight selected statistics are provided for the streamgage.
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Report on the Iowa Department of Agriculture and Land Stewardship for the year ended June 30, 2014
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Audit report on the City of Colo, Iowa for the year ended June 30, 2009
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Weekly newsletter for Center For Acute Disease Epidemiology of Iowa Department of Public Health.
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Audit report on the City of College Springs, Iowa for the year ended June 30, 2013
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Audit report on the Rathbun Area Solid Waste Commission for the year ended June 30, 2015
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Combined report on the eighth Judicial District Departments of Correctional Services for the year ended June 30, 2014
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Audit report on Muscatine County, Iowa for the year ended June 30, 2015
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Audit report on the Pocahontas County Solid Waste Commission for the year ended June 30, 2015
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Report on the Iowa Public Employees’ Retirement System (IPERS) for the year ended June 30, 2015
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Audit report on Clinton County, Iowa for the year ended June 30, 2015
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Weekly newsletter for Center For Acute Disease Epidemiology of Iowa Department of Public Health.
