Horton infiltration

Hi! I'm trying to calculate Horton inflitration to get the same results as in SWMM (I have to calculate it manually in excel for my job). Could you help me how was it calculated. For example I've got :

1.png

2.png

3.png

and the results:

4.png

I know all equations but I'don't know how to use them, especially how to caltulate tp from equation

Please help me

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