onlineoverland:   Overland flow using the diffusion wave method --- One book --- [Kinematic hydraulic diffusivity 211002]        References Ponce, V. M. 1986. Diffusion wave modeling of catchment dynamics. Journal of Hydraulic Engineering, 112(8), August, 716-727. [HTML version 2015]. Ponce, V. M. 1989. Engineering Hydrology: Principles and Practices. Prentice Hall, Englewood Cliffs, New Jersey, 322-325. Aguilar, R. D. 2014. Diffusion wave modeling of catchment dynamics using online calculation. INPUT DATA:           [Rationale]      [Description]      [Sample Input] Select:       SI units (metric) U.S. Customary units      (SI (metric) / U.S. Customary) Rainfall depth P  (cm / in):         cm [ P > 0 ] Runoff curve number CN :         [ CN > 20 ] Total rainfall duration tr  (hr):         [ tr > 0 ] Number of points in cumulative rainfall distribution Np :       [ Integer Np must be in the range 2 ≤ Np ≤ 101 ] Dimensionless cumulative time for rainfall distribution T* : [Np values, separated by commas; first value must be 0.; last value must be 1.] Dimensionless cumulative depth for rainfall distribution D* : [Np values, separated by commas; first value must be 0.; last value must be 1.] Total simulation time Tt  (hr):         [ Tt > 0 ] Number of time intervals NΔt :       [ Integer NΔt > 0 ] Number of time intervals for printing Npr :       [ Integer Npr > 0 ] Fraction used to estimate reference discharge Fr :       [ 0 ≤ Fr ≤ 1; leave blank to specify default value of Fr = 0.5 ] Overland flow area A  (ha / ac):         ha [ 0 < A ≤ 2500 in SI Units; 0 < A ≤ 1000 in U.S. Units ] Fraction of area in left plane Flp :       [ 0 < Flp ≤ 1; enter 1 to specify only one (left) plane ] Slope of left plane Slp :       [ 0.000001 ≤ Slp ≤ 0.1 ] Manning coefficient for left plane nlp :       [ 0.008 ≤ nlp ≤ 1 ] Rating exponent for left plane βlp :       [ 1.5 ≤ βlp ≤ 3; enter -1 to specify default value of βlp = 2 ] Slope of right plane Srp :       [ 0.000001 ≤ Srp ≤ 0.1; leave blank to exactly mirror left plane for Flp = 0.5 only ] Manning coefficient for right plane nrp :       [ 0.008 ≤ nrp ≤ 1; leave blank to exactly mirror left plane for Flp = 0.5 only ] Rating exponent for right plane βrp :       [ 1.5 ≤ βrp ≤ 3; enter -1 to specify default value of βlp = 2; leave blank to exactly mirror left plane for Flp = 0.5 only ] Length of channel Lch  (m / ft):         m [ Lch > 0 ] Slope of channel Sch :       [ 0.000001 ≤ Sch ≤ 0.1 ] Manning coefficient of channel nch :       [ 0.008 ≤ nch ≤ 0.250 ] Bottom width of channel Bch  (m / ft):         m [ Bch ≥ 0 ] Design depth of channel ych  (m / ft):         m [ ych > 0 ] Side slope of channel z [z H : 1 V]:       [ 0 ≤ z ≤ 10 ] OUTPUT: Time step Time (sec) Time (min) Time (hr) Outflow (m3/s) Cumulative Volume (m3) 0 0 0 0 0 0   Your request was processed at  10:58:22 am on January 22nd, 2025   [ 250122  10:58:22 ]. Thank you for running   onlineoverland.php   Please call again.   [211002]