PERMFILE131108

• Permit No: C1981018
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Doc Name: SAE Sedcad Runs ‎(Revised TR-54)‎
• Section_Exhibit Name: Illustration 44 PART 1
• Media Type: D
• Archive: No

Yb'orksheet v: Time of concentration (Tc) or travel time (Tt)
Project =DHk4 =REA "B" By DGA Date 7/1/93
Location Checked Dace
Circle one: Present Developed
Circle one: Tc ~Ttithrough subarea
NOTES: Space for as many as two segments per flow type can be used for each
vorksheec.
Include a map, sehematlc, or description of floe segments.
•

L6. Nanning's coughness coeff., n
Sheet flow (Applicable Co Tc only) Segment ID

1.
Surface description (table 3-1) ............ RANGE
2. Manning's roughness eoeff., n (table 3-1) .. 0.13
3. Flow length, L (total L < 300 ft) .......... ft 250
4. ivo-yr 24-hr rainfall, P2 .................. in 1"
5. Land slope, s .............................. fc/ft 0.30

6. 0.8
7
(nL
)
- 0.00
T
Compute Tt ......
hr
0.18 +
5
0
0
4
t
P2 s
Shallow concentrated floe Segment ID
7. Surface description (paved or unpaved) .....
8. Flow length, L ............................. ft
9. Watercourse slope, s ....................... ft/ft
10. Average velocity, V (figure 3-1) ........... ft/s
11. Tt ' 3600 V Compute Tt ...... hr '~
Channel flow Segment ID
12. Cross •eetlonal floe area, a ............... ft2
13. Wetced perlmecer, pv ....................... ft
L4. Hydraulic radius, r ~
8 Compute r ....... ft
P
v
15. Cnannel slope, s ........................... ft/ft
• 0.18

2/3 1/2
17. V 1.49 rn s Compute V ....... ft/s
18. Flow length, L ............................. ft
19. Tt ~ 3600 V Compute Tt hr +
20. Watershed or subarea Tc or St (add Tt Sn steps 6, 11, and 19) ....... hr 0.18
42-5
(210•VI-TR-55, Second Ed., June 1986) I D•3