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GENERAL40564
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Last modified
8/24/2016 7:59:44 PM
Creation date
11/23/2007 10:44:59 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1989065
IBM Index Class Name
General Documents
Doc Name
PRE MINING CONDITIONS
Media Type
D
Archive
No
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<br />1 <br />1 <br />1 <br />I <br />i <br />BASIN 6 <br />Project: Castle RoUc puames <br />Location: Caste Rack, Colaatlo <br />Condition: Pre-mining <br />Calwlatons for: Tc <br />NOTES: <br />Worksheet 3: Time of concentration (Tc) or travel time (Tt) <br />By: TPY <br />Checked: JGJ <br />Steel Flow (Aooliceble to Tc only) Segment ID <br />i Surface tlescdpfion (Ulte 3-]) ........ ... ............... ................. . <br />2 Manninp's roughness ccet., n (table 3.1 ) ............ ........... ... .............. <br />3. Flow IenpN. L (total L <= 300 t.) ............................. ............... ......... <br />4. Two-Yr 2a-hr rainfall, P2 .................... ................................... ........... <br />5. Lantl slope, e ......................................... .............. ........................ ft <br />8. Tt=[0.007 (nL)"(0.8)y[P2"(0.5) s^(0.4)1 Compute T1 ............................. <br />fl 300 <br />n 1.9 <br />ft 0.1167 <br />nn <br />Dale: 5/26/95 <br />Date: 5/?6/95 <br />0.22 <br />Shallow concentrated Bow Segment ID TP2 <br />7. Surtace descnpaon (pavetl or unpaved) . ............................. ....... unpaved <br />6 Flow IengN, L ...................... ............... ................................... ....... ft 1.428 <br />9. Watercourse slope. s ............................. ...................................... ....... fl/ft 0.0455 <br />10 Average velocity, V (figure 3-1) ............. ................................... ....... fl/5 3.44 <br />11. Tt = L/(3800 V! Computa TI ............ ...... hr 0.1 I S 0.12 <br /> <br /> <br />Channel flow Segment I[ <br />12. Cross sectional now area, a ................... ............ ................ ....... ...... <br />13. Wetted Penmeter. Pw .................. ....... .......... <br />..... .... .............. ..... <br />14. Hytlraulic radius, r =a/pw P <br />Com ute r .............. .. ....... <br />15 Channel slope. s .................... ........... ......... .... .............. . ....... <br />16. Manning's roughness wet . n .......... ..... ...................................... ..... <br />17 V = (1.49 x"(213) a"(1/2))/n Compute V.. ............... .. .. <br />............ ......... <br />18. Flow length. L ............... .. <br />........... .. .. .... <br />19. Tt = L/(3600 V) Compute Tt ............... ....... 0.02 <br /> <br />20. Watershed Or Subarea Tc or Tt (add Tt In steps 6,7,11 and 19). ..... . hr 0.36 <br />(210-V I•TR-55, Second Ed., June 1986) <br />Page 6 <br />
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