First of all,
My Construction is far away from Kyres house and the Mage house.
I would have drawn them in if that would have been the case!
The distance from the south-wall to the bridge is the same as this years Mass Barricades.
Let me give you a lesson in siege-craft.
Right now everyone can shoot arrows into your windows from across the river you silly hag.
These fortifications will force any attacker to mind several things. . .
I. Storm it with a ladder. (A small wall can be stormed even easier. No Wall doesn't even require a ladder to storm it. Your argument is invalid. It's like saying you don't build a door because someone could open it anyway.)
II. The South-wall is not defend-able if attacked from the towns direction, if the northern and western pinnacles are removed from the plans (my mistake). Moving the town-guard across the bridge will increase the effects of the construction.
II-1 Should the foe take over the south wall which will happen to EVERY
wall if the attackers are determined enough they find themselves in front of another obstacle, they have probably no siege machines for. (they would have to bring that over or trough the wall too.)
II-2 The Tower is way superior to the northern end of the South-wall. Many Archers can row up and seek shelter within its walls. Whoever is dashing enough to challenge the tower will earn more pointy arrowheads than a nail-bed.
III. The river keeps its natural function. Instead of merging it with the fortifications it completes them. For example our Chancellors proposal will negate it's use totally like Jerem pointed out very correctly.
By using the river this way we double the power of the whole Gate while keeping all it's current advantages.