online_time_of_concentration:   Time of concentration of small watersheds References [1] Kirpich formula (Eq. 2-61) [2] Kerby-Hathaway formula (Eq. 2-62) [3] Papadakis-Kazan formula [4] Horton formula (Eq. 4-29) [5] Kinematic wave formula (Eq. 4-50) [6] Laminar flow formula (Eq. 4-28) INPUT DATA: Units:     SI (metric) U.S. Customary     (SI units) (U.S. Customary units) Formula:     [1] Kirpich [2] Kerby-Hathaway [3] Papadakis-Kazan [4] Horton [5] Kinematic wave [6] Laminar flow Length L [all] (m) (ft):      Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinetc.php on line 388 Warning: Undefined variable $lengthunits in /var/www/html/ponce/onlinetc.php on line 390 Slope So [all] (m/m) (ft/ft):      Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinetc.php on line 400 Warning: Undefined variable $slopeunits in /var/www/html/ponce/onlinetc.php on line 402 Friction coefficient n [2,3,4,5]:      Effective rainfall intensity i [3,4,5,6] (mm/hr) (in/hr):      Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinetc.php on line 415 Warning: Undefined variable $intensityunits in /var/www/html/ponce/onlinetc.php on line 417 Rating exponent m [4,5]:      Water temperature T [6] (oC) (oF):      Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinetc.php on line 429 Warning: Undefined variable $temperatureunits in /var/www/html/ponce/onlinetc.php on line 431 OUTPUT: Please enter input data and press 'Calculate'. ⇐ ⇐ ⇐ [You may leave any input variable blank if not needed by formula].   Your request was processed at  08:07:23 am on April 4th, 2025   [ 250404  08:07:23 ]. Thank you for running online_time_of_concentration.   Please call again.   [070608]