Table 8. Hydraulic variables simulated by the HEC-RAS model for Danforth Brook at Hudson, Massachusetts

[River station: River station numbers increase in an upstream direction. ft 3/s, cubic foot per second; ft, foot; ft/ft, foot per foot; ft 2, square foot; ft/s, foot per second; --, no data]
River
station 		Discharge
(ft3/s) 		Calculated
water-surface
altitude
(ft) 		Observed
water-surface
altitude
(ft) 		Critical
water-surface
altitude
(ft) 		Energy
grade
slope
(ft/ft) 		Average
velocity
(ft/s) 		Flow
area
(ft2) 		Top width
(ft)
18 .2 0 .005 496 .49 496 .51 496 .41 0 .016475 0 .05 0 .10 2 .3
18 .2   .145 496 .71 496 .71 496 .50   .016479   .10 1 .43 10 .3
18 .2

54 .00 497 .92 - - 497 .38   .016494 2 .32 23 .31 22 .2
25 .9   .005 496 .52 496 .59   --   .001949   .05   .11 2 .1
25 .9   .145 496 .73 496 .81   --   .001308   .07 1 .94 14 .5
25 .9

54 .00 497 .96 - -   --   .001094 2 .20 24 .65 20 .5
51 .9   .005 496 .63 496 .65 496 .57   .023454   .08   .06 1 .5
51 .9   .145 496 .82 496 .88   --   .018886   .13 1 .12 10 .2
51 .9

54 .00 497 .99 - -   --   .003493 2 .48 21 .77 22 .2
60 .8   .005 497 .07 496 .10 497 .02   .157844   .09   .06 1 .6
60 .8   .145 497 .22 497 .27 497 .11   .231898   .17   .84 11 .5
60 .8

54 .00 497 .98 - -   --   .034410 3 .63 14 .91 20 .9
68 .7   .005 497 .22 497 .25   --   .007465   .02   .21 4 .3
68 .7   .145 497 .43 497 .45   --   .009904   .06 2 .50 16 .5
68 .7


54 .00 498 .18 - -   --   .009506 3 .04 17 .75 23 .0
81 .6   .005 497 .29 497 .31   --   .003843   .02   .24 7 .4
81 .6   .145 497 .50 497 .51   --   .003169   .06 2 .55 15 .7
81 .6 54 .00 498 .32 - -   --   .006165 2 .60 20 .93 25 .1
River
station 		Discharge
(ft3/s) 		Froude
No. 		Manning’s
coefficient 		Average
depth
(ft) 		Hydraulic
radius
(ft) 		Total
wetted
perimeter
(ft) 		Notes
18 .2 0 .005 0 .04 0 .494 0 .05 0 .04 2 .32 Measured discharge
18 .2   .145   .05   .494   .14   .13 10 .68 Measured discharge
18 .2 54 .00   .40   .083 1 .05   .99 23 .55 Estimated bankfull discharge
25 .9   .005   .04   .194   .05   .05 2 .14 Measured discharge
25 .9   .145   .04   .187   .13   .13 14 .68 Measured discharge
25 .9 54 .00   .35   .025 1 .20 1 .15 21 .44 Estimated bankfull discharge
51 .9   .005   .07   .361   .04   .04 1 .49 Measured discharge
51 .9   .145   .07   .361   .11   .11 10 .22 Measured discharge
51 .9 54 .00   .44   .035   .98   .97 22 .48 Estimated bankfull discharge
60 .8   .005   .08   .728   .04   .04 1 .59 Measured discharge
60 .8   .145   .11   .728   .07   .07 11 .49 Measured discharge
60 .8 54 .00   .75   .061   .71   .70 21 .23 Estimated bankfull discharge
68 .7   .005   .02   .725   .05   .05 4 .29 Measured discharge
68 .7   .145   .03   .725   .15   .15 16 .56 Measured discharge
68 .7 54 .00   .61   .040   .77   .76 23 .25 Estimated bankfull discharge
81 .6   .005   .02   .436   .03   .03 7 .37 Measured discharge
81 .6   .145   .02   .436   .16   .16 15 .83 Measured discharge
81 .6 54 .00   .50   .040   .83   .81 25 .70 Estimated bankfull discharge