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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions Citation (1) Types Citation (1) Map Service (1) OGC WFS Layer (1) OGC WMS Layer (1) OGC WMS Service (1) Contacts Celia Z Rosecrans U.S. Geological Survey - ScienceBase Bernard T Nolan Office of Planning and Programming Jo Ann M Gronberg Water Resources Tag Types Theme (1) Place (1) Harvest Set (1) Label (1) USGS Scientific Topic Keyword (1) Tag Schemes USGS Thesaurus (1) Geographic Names Information System (GNIS) (1) View Results as: JSON ATOM CSV

Probability distribution grids of dissolved oxygen and dissolved manganese concentrations at selected thresholds in drinking water depth zones, Central Valley, California The ascii grids represent regional probabilities that groundwater in a particular location will have dissolved oxygen (DO) concentrations less than selected threshold values representing anoxic groundwater conditions or will have dissolved manganese (Mn) concentrations greater than selected threshold values representing secondary drinking water-quality contaminant levels (SMCL) and health-based screening levels (HBSL) for water quality. The probability models were constrained by the alluvial boundary of the Central Valley to a depth of approximately 300 meters (m). We utilized prediction modeling methods, specifically boosted regression trees (BRT) with a Bernoulli error distribution within a statistical learning... Categories: Publication; Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Boosted Regression Trees, California, Central Valley, California, Domestic Well Water Use, Drinking Water Use, All tags... Groundwater, Hydrogeology, National Water Quality Program, Predictive Modeling, Public Supply Water Use, Statistical Analysis, USGS Science Data Catalog (SDC), United States, Visualization Methods, Water Quality, Water Resources, Fewer tags