Furrows of $120 \mathrm{~m}$ length with $0.5 \%$ slope are made at $90 \mathrm{~cm}$ spacing. The maximum nonerosive stream flow rate is applied in a furrow that takes 1.0 hour to reach the lower end. Then this flow rate is reduced to half of its size and, subsequently, continued for another 1.0 hour. The average depth of applied water is___________cm

Furrows of $120 \mathrm{~m}$ length with $0.5 \%$ slope are made at $90 \mathrm{~cm}$ spacing. The maximum nonerosive stream flow rate is applied in a furrow that takes 1.0 hour to reach the lower end. Then this flow rate is reduced to half of its size and, subsequently, continued for another 1.0 hour. The average depth of applied water is___________cm

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