Table 10. Hydraulic variables simulated by the HEC-RAS model for Elizabeth Brook near Stow, 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)
174 .35 1 .70 497 .08 497 .03 496 .81 0 .019710 0 .30 5 .72 23 .3
174 .35 3 .20 497 .12 497 .09 496 .88   .019735   .47 6 .83 23 .8
174 .35 11 .00 497 .19 497 .18 497 .02   .019716 1 .32 8 .36 24 .0
174 .35 30 .00 497 .23 497 .24 497 .20   .019663 3 .17 9 .47 24 .2
174 .35

 80 .00 497 .57   -- 497 .56   .019737 4 .44 18 .21 30 .4
185 .68 1 .70 497 .20 497 .20   --   .006956   .35 4 .92 22 .5
185 .68 3 .20 497 .23 497 .23   --   .005484   .57 5 .63 23 .2
185 .68 11 .00 497 .36 497 .38   --   .011713 1 .25 8 .79 26 .5
185 .68 30 .00 497 .47 497 .47   --   .012915 2 .50 11 .99 29 .7
185 .68

 80 .00 497 .82   --   --   .007950 3 .52 22 .75 32 .0
202 .05 1 .70 497 .37 497 .34   --   .020186   .51 3 .35 19 .0
202 .05 3 .20 497 .41 497 .42   --   .030851   .78 4 .13 21 .2
202 .05 11 .00 497 .53 497 .53   --   .011527 1 .58 6 .96 24 .7
202 .05 30 .00 497 .67 497 .67   --   .012613 2 .87 10 .47 28 .1
202 .05

 80 .00 497 .93   -- 497 .92   .015294 4 .31 18 .58 31 .4
213 .57 1 .70 497 .51 497 .51   --   .006675   .34 5 .04 25 .2
213 .57 3 .20 497 .55 497 .55   --   .005868   .53 6 .00 25 .6
213 .57 11 .00 497 .65 497 .65   --   .006353 1 .28 8 .57 26 .0
213 .57 30 .00 497 .82 497 .80   --   .006472 2 .29 13 .10 26 .5
213 .57

 80 .00 498 .16   --   --   .007978 3 .58 22 .34 27 .4
229 .45 1 .70 497 .71 497 .67   --   .035669   .57 2 .97 17 .4
229 .45 3 .20 497 .74 497 .75   --   .046278   .89 3 .60 19 .7
229 .45 11 .00 497 .84 497 .82 497 .78   .046381 1 .93 5 .69 22 .9
229 .45 30 .00 497 .98 497 .98 497 .97   .059812 3 .30 9 .08 23 .9
229 .45

 80 .00 498 .34   -- 498 .31   .044930 4 .41 18 .13 26 .6
241 .46 1 .70 497 .93 497 .69   --   .011605   .35 4 .89 24 .4
241 .46 3 .20 498 .00 498 .00   --   .011315   .49 6 .47 24 .9
241 .46 11 .00 498 .13 498 .13   --   .011699 1 .13 9 .73 25 .6
241 .46 30 .00 498 .26 498 .25   --   .006796 2 .27 13 .23 26 .3
241 .46 80 .00 498 .59   --   --   .005136 3 .61 22 .20 28 .6
River
station 		Discharge
(ft3/s) 		Froude
No. 		Manning’s
coefficient 		Average
depth
(ft) 		Hydraulic
radius
(ft) 		Total
wetted
perimeter
(ft) 		Notes
174 .35 1 .70 0 .11 0 .274 0 .25 0 .24 23 .44 Measured discharge
174 .35 3 .20   .15   .193   .29   .29 23 .90 Measured discharge
174 .35 11 .00   .39   .078   .35   .35 24 .18 Measured discharge
174 .35 30 .00   .89   .035   .39   .39 24 .38 Measured discharge
174 .35 80 .00   .97   .035   .60   .59 30 .81 Estimated bankfull   discharge
185 .68 1 .70   .13   .130   .22   .22 22 .61 Measured discharge
185 .68 3 .20   .20   .075   .24   .24 23 .33 Measured discharge
185 .68 11 .00   .38   .061   .33   .33 26 .69 Measured discharge
185 .68 30 .00   .69   .037   .40   .40 29 .86 Measured discharge
185 .68 80 .00   .73   .030   .71   .70 32 .40 Estimated bankfull   discharge
202 .05 1 .70   .21   .131   .18   .18 19 .02 Measured discharge
202 .05 3 .20   .31   .113   .19   .19 21 .33 Measured discharge
202 .05 11 .00   .52   .043   .28   .28 24 .80 Measured discharge
202 .05 30 .00   .83   .030   .37   .37 28 .32 Measured discharge
202 .05 80 .00   .98   .030   .59   .59 31 .74 Estimated bankfull   discharge
213 .57 1 .70   .13   .123   .20   .20 25 .32 Measured discharge
213 .57 3 .20   .19   .081   .23   .23 25 .72 Measured discharge
213 .57 11 .00   .39   .044   .33   .33 26 .19 Measured discharge
213 .57 30 .00   .57   .032   .50   .49 26 .81 Measured discharge
213 .57 80 .00   .70   .032   .81   .80 28 .03 Estimated bankfull   discharge
229 .45 1 .70   .24   .150   .17   .17 17 .50 Measured discharge
229 .45 3 .20   .37   .115   .18   .18 19 .80 Measured discharge
229 .45 11 .00   .68   .065   .25   .25 22 .97 Measured discharge
229 .45 30 .00   .95   .057   .38   .38 24 .08 Measured discharge
229 .45 80 .00   .94   .055   .68   .68 26 .82 Estimated bankfull   discharge
241 .46 1 .70   .14   .157   .20   .20 24 .52 Measured discharge
241 .46 3 .20   .17   .130   .26   .26 25 .03 Measured discharge
241 .46 11 .00   .32   .074   .38   .38 25 .79 Measured discharge
241 .46 30 .00   .56   .034   .50   .50 26 .59 Measured discharge
241 .46 80 .00   .72   .025   .78   .77 28 .94 Estimated bankfull   discharge