\begin{thebibliography}{}

\bibitem[\protect\citeauthoryear{Kerby}{Kerby}{1959}]{kerby59}
Kerby, W.~S. (1959).
\newblock Time of concentration for overland flow.
\newblock {\em Civil Engineering\/}~{\em 29\/}(3), 60.

\bibitem[\protect\citeauthoryear{Kirpich}{Kirpich}{1940}]{kirpich40}
Kirpich, Z.~P. (1940).
\newblock Time of concentration of small agricultural watersheds.
\newblock {\em Civil Engineering\/}~{\em 10\/}(6), 362.
\newblock The original source for the Kirpich equation. (In PDF).

\bibitem[\protect\citeauthoryear{Roussel, Thompson, Fang, Cleveland, and
  Garcia}{Roussel et~al.}{2005}]{roussel05}
Roussel, M.~C., D.~B. Thompson, X.~Fang, T.~G. Cleveland, and A.~C. Garcia
  (2005).
\newblock Timing parameter estimation for applicable {T}exas watersheds.
\newblock Final Project Report 0--4696--2, TxDOT, Lubbock, Texas 79409.

\bibitem[\protect\citeauthoryear{{U.S.~Army Corps of Engineers}}{{U.S.~Army
  Corps of Engineers}}{2006}]{hec-hms-3.1.0}
{U.S.~Army Corps of Engineers} (2006).
\newblock Hydrologic modeling system {HEC-HMS} -- version 3.1.0.
\newblock User's manual CPD--74A, Hydrologic Engineering Center, Davis,
  California.

\end{thebibliography}