Mean annual, seasonal, and monthly precipitation and runoff in Arkansas, 1951-2011

Abstract

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Hydrogeology and hydrologic conditions of the Ozark Plateaus aquifer system

“…(winter). In the southern part of the Ozark system study area, the greatest precipitation occurred during the months of March through May and November and December (Pugh and Westerman, 2014). Seasonal precipitation for the Ozark system varied around the mean by approximately 170-208 percent.…”

Trends in Land Use, Irrigation, and Streamflow Alteration in the Mississippi River Alluvial Plain

“…We utilized the results of this two-period analysis to produce flow duration curves for the pre-alteration period (start of record-1986) and the post alteration period , as well as to examine the change in 7-day minimum flow before and after 1987. We chose the year of 1987 as a breakpoint due to the analysis of census data indicating a rise in irrigated cropland area at this time ( Figure 3A), as well as evidence that surface and groundwater connectivity began to change at this time in the MRVAA region (Clark et al, 2011;Pugh and Westerman, 2014).…”

“…Surface interpolations of the alluvial aquifer show a cone of depression occurring in the Cache River basin, with the deepest portion 29 to 44 m below surface. Comparatively, in the areas outside of the cones of depression, depth to water is 0 to 13 m. Without knowledge of riverbed material and infiltration capability, it is not possible to know the extent that depth to groundwater affects surface water resources in the declining areas, although modeling studies and data collected in the region do suggest rivers are losing water to recharge the alluvial aquifer (Schrader, 2010;Pugh and Westerman, 2014).…”

Flood-frequency comparison from 1995 to 2016 and trends in peak streamflow in Arkansas, water years 1930–2016

“…in the Springfield-Salem Plateaus near the Missouri State line and the Arkansas Valley near the Oklahoma State line to 64 in. in the Ouachita Mountains (Pugh and Westerman, 2014). Wagner and others (2016) used data collected through 2013 and the Expected Moments Algorithm (EMA) for fitting the Log-Pearson Type III distribution of the annual peak streamflow data that were used to estimate AEPFs others, 1997, 2001;Griffis and others, 2004).…”