Using the time and space criterion, classify the following open-channel flow scenarios:
(a) continuous opening of a gate to let water into a prismatic channel;
(b) uniform rainfall over a long, sloped roof top;
(c) flow in the roof gutter resulting from (b);
(d) flow in the above roof gutter when the rainfall intensity increases with time;
(e) flow in a prismatic shipping canal; and
(f) flow in a small urban stream because of an intense thunderstorm.