Equations for estimating bankfull channel geometry and discharge for streams in Massachusetts

Abstract

Inch/Pound to SI Multiply By To obtain Length inch (in.) 25.4 millimeter (mm) foot (ft) 0.3048 meter (m) Area square mile (mi 2) 2.590 square kilometer (km 2) Volume cubic foot (ft 3) 0.02832 cubic meter (m 3) Flow rate cubic foot per second (ft 3 /s) 0.02832 cubic meter per second (m 3 /s) Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows: °F=(1.8×°C)+32 Temperature in degrees Fahrenheit (°F) may be converted to degrees Celsius (°C) as follows: °C=(°F-32)/1.8 Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Hydraulic assessment of existing and alternative stream crossings providing fish and wildlife passage at seven sites in Massachusetts

“…The maximum height between the streambed and low chord of the box varies depending on the existing road elevation relative to the streambed; the height between the low chord of the bridge and the streambed is about 7 ft at Churchill Street and about 4 ft at Hancock Road. The span width (18 ft) is consistent with the average bankfull width multiplied by 1.2 measured at five surveyed cross sections excluding the approach, face, and exit cross sections at the two road crossings and about equal to the bankfull width determined by the single-parameter regional bankfull equations (Bent and Waite, 2013) (fig. 19).…”

“…The bridge span was determined from the bankfull width from 2 upstream and 4 downstream model cross sections that varied from 26 to 36 ft (two cross sections with anomalously large bankfull widths were not used). The average bankfull width (38 ft) was about equal to the width (40 ft) determined by the twoparameter regional bankfull equations of Bent and Waite (2013). The rounded bankfull width multiplied by 1.2 resulted in a bridge span of 46 ft, which is similar to the width of channel cross section at the upstream face of the culvert (fig.…”

Spatial statistical network models for stream and river temperature in New England, USA

“…[]. We estimated reach dimensions not available from habitat surveys based on empirical equations for New England channel morphometry developed by Bent []. We based maximum lake depths not available from lake survey data on estimates generated by Hollister et al .…”

Flood-inundation maps for the Green River in Colrain, Leyden, and Greenfield, Massachusetts, from U.S. Geological Survey streamgage 01170100 Green River near Colrain to the confluence with the Deerfield River

“…The 7.6-and 14.4-ft stages correspond to NAVD 88 elevations of 439.9 ft and 446.7 ft, respectively. The mapped stages from 7.6 to 14.4 (table 6) were selected to match the flood stage from about bankfull (about the 50-percent AEP flood also called the 2-year recurrence interval flood; Bent and Waite, 2013) to an AEP of less than 0.2 percent also called the 500-year recurrence interval flood (maximum stage in the current [2015] Green River streamgage rating curve 34) and exceeds the maximum recorded water level of 13.97 ft at the streamgage (Tropical Storm Irene).…”