Maximum abutment-scour depths predicted with five different methods were compared to maximum observed at 100 abutments 50 bridge sites in Maine a median age of 66 years. Prediction included the Froehlich/Hire method, Sturm and Maryland method published Federal Highway Administration Hydraulic Engineering Circular 18 (HEC-18); Melville method; envelope curves. No correlation was found between scour calculated using any prediction scour. Abutment field ranged from 0 6.8 feet, an average less...

Abstract We present a regression model for estimating mean August baseflow per square kilometer of drainage area to help resource managers assess relative amounts in Maine streams with Atlantic Salmon habitat. The was derived from baseflows computed at 31 USGS streamflow gages Maine. use an ordinary least squares estimate unit two explanatory variables: percentage the basin underlain by sand and gravel aquifers July precipitation basin. This provides ability cubic meters second on...

Abstract Most geomorphology studies of dam removals have focused on sites with appreciable quantities stored sediments. There is great interest in channel responses to sediment releases because potential effects aquatic and riparian habitats human uses these areas. Yet, behind many dams the Northeast U.S. other regions world only minor accumulations are present small impoundments, run‐of‐river design management (inflow ≈ outflow), low watershed yield, and/or beds dominated by coarse bedrock....

First posted December 22, 2020 Revised February 11, 2021 For additional information, contact: Director, New England Water Science CenterU.S. Geological Survey10 Bearfoot RoadNorthborough, MA 01532 Below average and infrequent rainfall from May through September led to an extreme hydrologic drought across much of England, with some areas experiencing a flash drought, reflecting its quick onset. The U.S. Survey (USGS) recorded record-low streamflow groundwater levels throughout the region. In...

Understanding the accuracy of commonly used methods for estimating peak streamflows is important because designs bridges, culverts, and other river structures are based on these flows. Different were analyzed small drainage basins in Maine. For smallest basins, with areas 0.2 to 1.0 square mile, nine from actual rainfall events at four crest-stage gaging stations modeled by Rational Method Natural Resource Conservation Service TR-20 method compared observed The had a root mean error (RMSE)...

First posted March 8, 2023 For additional information, contact: Director, New England Water Science CenterU.S. Geological Survey10 Bearfoot RoadNorthborough, MA 01532 During April through September 2022, much of experienced a short but extreme hydrologic drought that was similar to the 2020. By August Providence, Rhode Island, declared Federal disaster area, and London Windham counties in Connecticut were natural areas. Mandatory water use restrictions put place communities Connecticut,...

Methods for estimating August median streamflow were developed ungaged, unregulated streams in eastern coastal Maine. The methods apply to with drainage areas ranging size from 0.04 73.2 square miles and fraction of basin underlain by a sand gravel aquifer 0 71 percent. equations data three long-term (greater than or equal 10 years record) continuous-record streamflow-gaging stations, 23 partial-record streamflow- gaging 5 short-term (less stations. A mathematical technique standard low-flow...

Abstract We test the use of a mixed‐effects model for estimating lag to peak small basins in Maine (drainage areas from 0.8 78 km 2 ). Lag is defined as time between center volume excess rainfall during storm event and resulting streamflow. A allows multiple observations at sites without violating assumptions inherent traditional ordinary least squares models, which assume each observation independent. The mixed includes basin drainage area maximum 15‐min depth individual storms explanatory...

First posted September 2, 2015 For additional information, contact: Director, New England Water Science CenterU.S. Geological Survey10 Bearfoot RoadNorthborough, MA 01532 Or visit our Web site athttp://newengland.water.usgs.gov The U.S. Survey developed flood elevations in cooperation with the Federal Emergency Management Agency for a 30-mile reach of Deerfield River from confluence Cold tributary to Connecticut towns Charlemont, Buckland, Shelburne, Conway, Deerfield, and Greenfield...

Regression equations to estimate peak streamflows with 1- 500-year recurrence intervals (annual exceedance probabilities from 99 0.2 percent, respectively) were developed for small, ungaged streams in Maine. Equations presented here are the best available estimating flows at basins Maine drainage areas 0.3 12 square miles (mi2). Previously continue be basin greater than mi2. New based on streamflow records 40 U.S. Geological Survey streamgages a minimum of 10 years recorded between 1963 and...

First posted July 12, 2018 For additional information, contact: Director, New England Water Science Center U.S. Geological Survey 10 Bearfoot Road Northborough, MA 01532 A series of 15 digital flood-inundation maps was developed for a 10.2-mile reach the Pawtuxet River in municipalities West Warwick, and Cranston, Rhode Island, by (USGS), cooperation with Island Emergency Management Agency Army Corps Engineers. The coverage extends downstream from Natick Pond dam near State Route...

Maine StreamStats is a tool that any user with Internet access can use to delineate basin on the fly and estimate wide variety of streamflow statistics for ungaged sites rivers streams in Maine. Estimates are based regression equations or from data similar gaged locations stream. national application be used estimates many other states across country. Reports referenced this fact sheet present flow statistics, describe errors associated estimates, methods develop measure characteristics...

Digital flood-inundation maps for a 5.4-mile reach of the East Fork White River at Columbus, Indiana, from where Flatrock and Driftwood Rivers combine to make up just upstream confluence Clifty Creek with River, were created by U.S. Geological Survey (USGS) in cooperation Indiana Department Transportation. The inundation maps, which can be accessed through USGS Flood Inundation Mapping Science Web site http://water.usgs.gov/osw/flood_inundation, depict estimates areal extent flooding...

Up to 8.5 inches of rain fell from April 15 through 18, 2007, in southern Maine. The - combination with up an inch water snowmelt resulted extensive flooding. York County, Maine, was declared a presidential disaster area following the event. U.S. Geological Survey, cooperation Federal Emergency Management Agency (FEMA), determined peak streamflows and recurrence intervals at 24 locations water-surface elevations 63 sites 2007 flood. Peak were data continuous-record streamflow-gaging stations...

Methods for estimating June and August median streamflows were developed ungaged, unregulated streams in southern Maine. The methods apply to with drainage areas ranging size from 0.4 74 square miles, percentage of basin underlain by a sand gravel aquifer 0 84 percent, distance the centroid Gulf Maine line paralleling coast 14 94 miles. Equations data 4 long-term continuous-record streamgage stations 27 partial-record stations. Estimates at are presented. A mathematical technique standard...

Abstract Factors affecting iron fouling in wet areas adjacent to roadways were investigated by collecting field rock cut and aqueous physicochemical data; developing exploratory predictive models; geochemical models. Basic data included the identification of from aerial imagery visits at 374 New Hampshire locations, their associated rock-fill sites. Based on water quality measurements 36 sites, occurrence was with higher values specific conductance, lower concentrations dissolved oxygen pH...

First posted March 23, 2016 For additional information, contact: Director, New England Water Science Center U.S. Geological Survey 331 Commerce Way, Suite 2 Pembroke, NH 03275 Or visit our Web site at http://newengland.water.usgs.gov/ The (USGS) has many ongoing and recent water-related natural hazard activities in that can be used to help mitigate the effects of hazards cooperation with other agencies. themes related potential tools science better understand address them include following:...

First posted September 2, 2016 Revised November 23, For additional information, contact: Director, New England Water Science Center U.S. Geological Survey 10 Bearfoot Road Northborough, MA 01532 Or visit our Web site at: http://newengland.water.usgs.gov The developed flood elevations in cooperation with the Federal Emergency Management Agency for a 14.3-mile reach of Green River Colrain, Leyden, and Greenfield, Massachusetts, to assist landowners emergency management workers prepare recover...

A series of nine digital flood-inundation maps were developed for an 8-mile reach the Hoosic River in North Adams and Williamstown, Massachusetts, by U.S. Geological Survey (USGS) cooperation with Federal Emergency Management Agency. The coverage extends from confluence Branch to Vermont State line. Peak flows 20-, 10-, 4-, 2-, 1-, 0.5-, 0.2-percent annual exceedance probabilities computed updated flood-frequency analyses. These peak routed through a one-dimensional step-backwater hydraulic...

Digital flood-inundation maps for a 6.3-mi reach of the Wabash River from 0.1 mi downstream Interstate 70 bridge to 1.1 miles upstream Route 63 bridge, Terre Haute, Indiana, were created by U.S. Geological Survey (USGS) in cooperation with Indiana Department Transportation. The inundation maps, which can be accessed through USGS Flood Inundation Mapping Science Web site at http://water.usgs.gov/osw/flood_inundation/, depict estimates areal extent flooding corresponding select water levels...

First posted November 14, 2013 Revised June 5, 2019 For additional information, contact: Director, New England Water Science CenterU.S. Geological Survey331 Commerce Way, Suite 2Pembroke, NH 03275 Consistent elevations at stable benchmarks, referenced to a common datum, are important for measuring and comparing water levels computing flows throughout watershed. Elevations presented 38 control points within the St. Croix River watershed, mostly along main stem of River. Vertical located 7...

Severe flooding occurred in Aroostook and Penobscot Counties northern Maine between April 28 May 1, 2008, was most extreme the town of Fort Kent. Peak streamflows County were result a persistent heavy snowpack that caused high when it quickly melted during third week 2008. Snowmelt followed by from two to four inches rainfall over 2-day period Maine. water-surface elevations resulting flood obtained 13 continuous-record streamgages 63 surveyed high-water marks Counties. 20 sites on 15...