Rain is falling on a poorly designed 300-m2 flat roof of a contemporary home. The design flaw requires the water level o

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Rain is falling on a poorly designed 300-m2 flat roof of a
contemporary home. The design flaw requires the water level on the
roof to reach approximately 6 cm above the plane of the roof before
the water flows into drains.
(a) Taking the accumulated rain on the roof as the system, can
the process before the water level reaches 6 cm be considered
batch, semi-batch, or continuous? Is it transient or steady-state?
Once the water starts to flow into the drains, how do your answers
change?
(b) Before the water starts draining, which of the terms in the
general balance equation (Equation4.2-1) can be omitted? Why? How
do your responses change after water starts draining? (c) Water
begins flowing from the roof after 30 minutes of rainfall. What
will the rate of draining (L/s) be if rain continues to fall at the
same rate?