1. It gets more flow than qFull because the water in the pipe has more than just the bed slope to push it - it also has the water surface slope.
There is about a 5 meter head pushing the water out if you the bed slope to the water surface slope - see the HGL Plot.
There is about a 5 meter head pushing the water out if you the bed slope to the water surface slope - see the HGL Plot.
2. The Q dynamic or St. Venant flow uses ALL of the information you have about the condition in the link (see the next image) so the flow is greater than Qfull and Q normal flow. The information includes the hydraulic radius and cross sectional areas for upstream, midpoint and the downstream ends of the links.
![Reblog this post [with Zemanta]](http://img.zemanta.com/reblog_e.png?x-id=41eae1c3-d322-440c-999a-951467c9d22b)
