FLOOD11632 ‎(2)‎

• County: Costilla
• Community: Costilla County
• Stream Name: Rito Seco
• Basin: Rio Grande
• Title: Approximate Floodplain - Rito Seco
• Date: 1/5/2007
• Prepared For: Costilla County
• Prepared By: HDR Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

costilla.rep
Delta EG (ft) 0.05 Conv. Total (cfs) 5870.9 5651.1
Delta WS (ft) 0.06 Top Width (ft) 35.00 35.00
BR Open Area s ft) 143.50 Frctn Loss (ft) 0.05 0.00
eR open Vel ( t9s) 2.92 C& E Loss (ft) 0.00 0.00
coef of Q shear Total lb/sq ft) 0.28 0.29
Br Sel Method Energy only Power Total ~lb/ft s) 0.79 0.85
BRIDGE OUTPUT Profile #25-Year
E.G. U5. (ft
~ 8013.86 Element Inside BR US Inside BR DS
W.S. U5. (ft 8013.71 E.G. Elev (ft) 8013.86 8013.80
Q Total (cfs) 295.00 w.s. Elev (ft) 8013.71 8013.64
Q eridge (cfs) 295.00 Crit W.S. (ft) 8012.31 8012.31
Q weir (cfs) Max Chl Dpth (ft) 2.71 2.64
weir Sta Lft (ft) Vel Total (ft/s) 3.11 3.19
Weir sta Rgt (ft) Flow Area (sq ft) 94.71 92.38
Weir Submerg Froude # Chl 0.33 0.35
Weir Max Depth (ft) Specif Force (cu ft) 156.68 151.19
Min E1 Weir Flow (ft) 8011.01 Hydr Depth (ft) 2.71 2.64
Min E1 Prs (ft) 8015.10 W.P. Total (ft) 37.70 37.64
Delta EG (ft) 0.06 Conv. Total (cfs) 6501.1 6244.7
Delta ws (ft) 0.07 Top Width (ft) 35.00 35.00
BR open Area sq ft)
BR O
V
l ( t
) 143.50
3
19 Frctn Loss (ft)
&
f 0.06 0.00
pen
e
/s
Coef of Q . C
E Loss (
t)
shear Total (lb/sq
ft) 0.00
0.32 0.00
0.34
Br sel Method Energy only Power Total (lb/ft s) 1.01 1.09
BRIDGE OUTPUT Profile #50-Year
E.G. US. ft 8013.92 Element Inside BR US Inside BR DS
w.s. U5. ft 8013.55 E.G. Elev (ft) 8013.92 8013.70
Q Total (cfs) 435.00 W.S. Elev (ft) 8013.55 8013.22
Q Bridge (cfs) 435.00 Crit W.S. (ft) 8012.69 8012.69
Q weir (cfs) Max Chl Dpth (ft) 2.55 2.21
weir sta Lft (ft) vel Total (ft/s) 4.88 5.61
Weir Sta Rgt (ft) Flow Area (sq ft) 89.22 77.52
Weir 5ubmerg Froude # Chl 0.54 0.66
weir Max Depth (ft) Specif Force (cu ft) 179.59 161.65
Min E1 Weir Flow (ft) 8011.01 Hydr Depth (ft) 2.55 2.21
Min E1 Prs (ft) 8015.10 W.P. Total (ft) 37.55 37.21
Delta EG (ft) 0.21 Conv. Total (cfs) 5902.0 4696.7
Delta ws (ft) 0.33 Top Width (ft) 35.00 35.00
BR Open Area (sq ft) 143.50 Frctn Loss (ft) 0.18 0.00
BR open Vel (ft/s) 5.61 C& E Loss (ft) 0.04 0.00
Coef of Q shear Total (lb/sq ft; 0.81 1.12
Br Sel Method Energy only Power Total (lb/ft s) 3.93 6.26
BRIDGE OUTPUT Profile #100-Year
E.G. U5. (ft) 8014.26 Element inside BR US Inside BR DS
w.5. U5. (ft) 8013.82 E.G. Elev (ft) 8014.26 8014.03
Q Total (cfs) 522.00 w.s. Elev (ft) 8013.82 8013.46
Q Bridge (cfs) 522.00 Crit W.S. (ft) 8012.92 8012.92
Q weir (cfs) Max Chl Dpth (ft) 2.82 2.46
weir sta Lft (ft) vel Total (ft/s) 5.28 6.06
Weir Sta Rgt (ft) Flow Area (sq ft) 98.79 86.11
weir submerg Froude # Chl 0.55 0.68
Weir Max Depth (ft) Specif Force (cu ft) 225.09 204.21
Min E1 Weir Flow (ft) 8011.01 Hydr Depth (ft) 2.82 2.46
Min E1 Prs (ft) 8015.10 W.P. Total (ft) 37.82 37.46
Delta EG ft
~
3 0.23 Conv. Total (cfs) 6960.7 5571.9
Delta ws
ft 0.36 Top Width (ft) 35.00 35.00
BR Open area (s ft) 143.50 Frctn Loss (ft) 0.18 0.00
BR Open Vel (ft9s) 6.06 C& E Loss (ft) 0.04 0.00
Coef of Q shear Total lb/sq ft) 0.92 1.26
Br Sel ~ethod Energy only Power Total ~lb/ft s) 4.85 7.64
Note: Multiple critical depths were found at this location. The critical depth with the lowest,
valid,
energy was used.
Note: Multiple critical depths were found at this location. The critical depth with the lowest,
valid,
energy was used.
BRIDGE OUTPUT Profile #200-Year
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