                           CHECK-RAS Program: NT Check
              Manning's n Value and Transition Loss Coefficient Review

Project File:   Q:\PROJECT FILES\25047-North Carolina Flood Study\Pasquotank Basin\Perquimans County\Perquimans Revised LDS Model Submittal\HEC-RAS Models\Yeopim Basin\BETHEL CREEK.PRJ
Plan File:      Q:\PROJECT FILES\25047-North Carolina Flood Study\Pasquotank Basin\Perquimans County\Perquimans Revised LDS Model Submittal\HEC-RAS Models\Yeopim Basin\BETHEL CREEK.p01
Geometry File:  Q:\PROJECT FILES\25047-North Carolina Flood Study\Pasquotank Basin\Perquimans County\Perquimans Revised LDS Model Submittal\HEC-RAS Models\Yeopim Basin\BETHEL CREEK.g01
Flow File:      Q:\PROJECT FILES\25047-North Carolina Flood Study\Pasquotank Basin\Perquimans County\Perquimans Revised LDS Model Submittal\HEC-RAS Models\Yeopim Basin\BETHEL CREEK.f01
Report File:    Q:\PROJECT FILES\25047-North Carolina Flood Study\Pasquotank Basin\Perquimans County\Perquimans Revised LDS Model Submittal\HEC-RAS Models\Yeopim Basin\BETHEL CREEK.nt
Selected profiles: 100-Year;Floodway
Date: 8/8/2003 
Time: 10:14:33 AM 


SECNO    STRUCTURE           NLOB      NCHL      NROB      CNTR      EXP
--------------------------------------------------------------------------------
Bethel Creek,Reach - 1
 22576.2                     0.14      0.045     0.14      0.1       0.3
 22069.5                     0.14      0.045     0.14      0.1       0.3
 21397.4                     0.14      0.045     0.14      0.1       0.3
 20853.6                     0.14      0.045     0.14      0.1       0.3
 20314                       0.14      0.045     0.14      0.1       0.3
 19807.8                     0.14      0.045     0.14      0.1       0.3
 19293.4                     0.14      0.045     0.14      0.1       0.3
 18799.3                     0.14      0.045     0.14      0.1       0.3
 18242.1                     0.14      0.045     0.14      0.1       0.3
 17733.9                     0.14      0.045     0.14      0.1       0.3
 17179.8                     0.14      0.045     0.14      0.3       0.5
 17107.5 Culvert-Up          0.14      0.045     0.14      0.3       0.5
 17107.5 Culvert-Dn          0.14      0.045     0.14      0.3       0.5
 17035.3                     0.14      0.045     0.14      0.3       0.5
 16709.6                     0.14      0.045     0.14      0.1       0.3
 16183.4                     0.14      0.045     0.14      0.1       0.3
 15658.5                     0.14      0.045     0.14      0.1       0.3
 15208.6                     0.14      0.045     0.14      0.1       0.3
 14679.7                     0.14      0.045     0.14      0.1       0.3
 14046.3                     0.14      0.045     0.14      0.1       0.3
 13547.6                     0.14      0.045     0.14      0.1       0.3
 12959.5                     0.14      0.045     0.14      0.1       0.3
 12410.5                     0.14      0.045     0.14      0.1       0.3
 11937.3                     0.14      0.045     0.14      0.1       0.3
 11383.6                     0.14      0.045     0.14      0.1       0.3
 10874.3                     0.14      0.045     0.14      0.1       0.3
 10364.1                     0.14      0.045     0.14      0.1       0.3
 9727.1                      0.14      0.045     0.14      0.1       0.3
 9297.4                      0.14      0.045     0.14      0.1       0.3
 8876.8                      0.14      0.045     0.14      0.1       0.3
 8507.6                      0.14      0.045     0.14      0.3       0.5
 8484.9  Bridge-Up           0.14      0.045     0.14      0.3       0.5
 8484.9  Bridge-Dn           0.14      0.045     0.14      0.3       0.5
 8462.3                      0.14      0.045     0.14      0.3       0.5
 8191.9                      0.14      0.045     0.14      0.1       0.3
 7673                        0.14      0.045     0.14      0.1       0.3
 7168.8                      0.14      0.045     0.14      0.1       0.3
--------------------------------------------------------------------------------

---Summary of Statistics---
                             Minimum        Maximum
Left Overbank n Value:        0.14           0.14 
Right Overbank n Value:       0.14           0.14 
Channel n Value:              0.045          0.045 
Contraction Coefficient:      0.1            0.3 
Expansion   Coefficient:      0.3            0.5 



ROUGHNESS COEFFICIENT CHECK
------------------------------------

TRANSITION LOSS COEFFICIENT CHECK
----------------------------------

RS:      17733.9 
NT TL 01 This is section 4
         Contraction and expansion loss coefficients are 0.1 and 0.3
         They should be equal to 0.3 and 0.5 respectively.

RS:      8876.8 
NT TL 01 This is section 4
         Contraction and expansion loss coefficients are 0.1 and 0.3
         Width ratio is 0.10
         Contraction loss coefficient is 0.1
         It is outside the range of 0.3 and 0.5 from 
         the Table B.4 of HEC-RAS hydraulics Reference Manual.

ROUGHNESS COEFFICIENT AT STRUCTURES
------------------------------------

RS:      8484.9 
NT RS 02 The channel n value of 0.045 for the upstream internal bridge opening
         section is equal or larger than the channel n value of 0.045 at Section 3.
         Usually, the channel n value of the bridge opening section is
         less than the channel n value of Section 3.
         The selection of the n value(s) should be reevaluated.

RS:      8484.9 
NT RS 02 The channel n value of 0.045 for the downstream internal bridge opening
         section is equal or larger than the channel n value of 0.045 at Section 2
         Usually, the channel n value of the bridge opening section is
         less than the channel n value of Section 2.
         The selection of the n value(s) should be reevaluated.

---END---
