Horton's infiltration equation was fitted to data from an infiltration test. It was found that the initial infiltration capacity was 20 mm/h, the final infiltration capacity was 5 mm/h and the exponential decay constant was 0.5 h-1. If the infiltration was at capacity rates, the total infiltration depth for a uniform atom of 10 h duration would be

• A. 80 mm
• B. 50 mm
• C. 30 mm
• D. 20 mm