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

V~'urksheet 3: Time of concentration (Tc) or travel time (Tt)
Project SDHr4 AREA "A" ey DGA Date 7/1/93
Location Checked Date
•

Circle one: Present Developed
Circle one: Tc TC through subarea
NOTES: Space for as many as cvo segments pet flow type can be used for each
worksheet.
Include a map, schematic, or description of floe segments.
Sheet floe (Applicable to T
only) Segment ID
c
1. Surface description (table 3-1) ............
2. Manning's roughness coeff., n (table 3-1) .. 0.13
3. Flaw length, L (total L < 300 ft) .......... ft 200
4. Tvo-yr 24-hr rainfall, P2 .................. in 1„
5. Land slope, s .............................. ft/ft 0.30
0.8
0.00
7
(n
L)
+
6. Compute Tt ......
T hr 0.15
0
5
O
4
t
P2 s
Shallow concentrated flow Segment ID
7. Surface description (paved or unpaved) .....
8. Flow length, L ............................. ft
9. gatereourse slope, s ....................... ft/ft
10. Average velocity, V (FSgure 3-1) ........... ft/s
11. Tt 3600 V Compute TC ....., hr +
Channel floe Segment ID
12. Cross sectional floe area, a ............... ft2
13. 47ected perimeter, pv ....................... ft
14. Hydraulic radius, r
= Compute r ....... fc
P
v
15. Channel slope, s ........................... ft/ft
16. Hanning's roughness coeff., n ..............
2/3 1/2
1.49 r
a
17. V
Compute V ....... ft/s
n
18. Flow length, L ............................. ft
0.15

19. Tt 3600 V Compute TC ,,.... hr +
20. Yacershed or oubaree Tc or TC (add Tt in steps 6, 11, and 19) ....... hr 0.15
42-2
(210-VI-TR-55, Second Ed., Tune 1986) D•3