Kan. Admin. Regs. § 5-40-30 - Time of concentration
(a) Except as
specified in subsections (b) and (c), the time of concentration (Tc) shall be
determined by using one of the methods specified in chapter 15, "travel time,
time of concentration and lag," in the natural resources conservation service
(NRCS) national engineering handbook, part 630, dated August 1972, which is
hereby adopted by reference.
(b)
For drainage areas of not more than three square miles, the time of
concentration (Tc) may be determined by use of the Kirpich formula, which is as
follows:
See Equation at http://www.kssos.org/pubs/register%5C2007%5CVol_26_No_18_May_3_2007_p_607-676.pdf
Where
Tc = the time of concentration, in hours
L = the longest distance that water has to travel in the drainage basin, in miles
H = the maximum elevation difference in the drainage basin, in feet.
(c) In addition to
the methods specified in subsections (a) and (b), the applicant may determine
Tc based on sound engineering principles and commonly accepted engineering
practices if the applicant obtains the prior written consent of the chief
engineer.
Notes
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