The U.S. Geological Survey's (USGS) mission is to provide reliable scientific
information about the Nation's natural resources. An integral part of that mission
is to provide consistent, long-term water-resources data to customers, cooperators,
and the public. To accomplish our mission, we operate a widespread surface and
ground-water data collection network as well as research a wide range of scientific
issues throughout Iowa.
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First-ever reconnaissance study documents the off-field transport to adjacent streams of nitrapyrin (a nitrification inhibitor applied with fertilizers as a bactericide to kill natural soil bacteria for the purpose of increasing crop yields).
The report presents regional regression equations for estimating six low-flow frequency statistics that include spring (April through June) and fall (October through December) 1-, 7-, and 30-day mean low flows for a recurrence interval of 10 years.
The presence of indicator bacteria, hepatitis E virus (HEV), and numerous bacterial pathogen genes increased following precipitation-induced runoff events in streams draining adjacent land surfaces in Iowa where swine manure was recently applied.
The hydrology and chemistry of a wastewater-impacted stream and adjacent groundwater responded rapidly (e.g. had fewer chemicals at lower concentrations) following wastewater treatment facility shutdown. However, the adjacent shallow groundwater remained a continuing source of some wastewater-derived contaminants such a pharmaceuticals to the stream at least 1 year post-shutdown.
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