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[Nameless Archon]

It took about a season to evaporate a 5x5 room of 7/7 water on 3 of my tests, 1 had no noticeable evaporation at all after a season, and the last one had some. And the 5x5 exposed aquifer rooms had no noticeable effect on them in any map.

I've tried gravity filling (to 1/7) one level of my 'standard 31x31' fort design, and with a purely gravity fed solution it takes an age - I get about half of it covered and the rate of fill is vastly slowed - waiting for it to actually cover the entire area is iffy - it's just too much area for one source. A pump, on the other hand, can easily flood it entirely (and quickly) if not stopped.

The more area you cover, the more 1/7 tiles you get - being in a scorching biome is icing on this particular cake. Looking at the size of the area he's got, evaporation is almost certainly the cause.

Do not underestimate the flow of a pump. When powered, they move water like wings move birds.

[Funburns]

After seeing the first screenshot, it seems very strange that everyone is insisting pumps are the best way to solve this. It's pretty clear to me that the easiest way to fill the moat in its current situation is to channel out those blocks keeping the ocean from filling in.

The safest way to do this is to build a walkway made of floor out over some open space next to the tiles you're planning on digging, and place one unit of (construction-[s]uspended) wall ontop of the squares dwarves should NOT be standing on -- except for the one tile you are channeling out at any given time. This will prevent the dwarves from drowning due to the mechanics of channeling and ramps, and dwarves' unwillingness to stand on unfinished wall tiles.

Spoiler: Helpful picture from DFwiki (click to show/hide)

edit: fixed link

[mrbobbyg]

Use pumps 

I, uh, don't know how to use pumps. 

You, my good sir, are going to !!learn!! to use pumps.  If you can't use pumps, you can't build effective magma traps.  And if you can't build magma traps, Armok cries little fiery tears.

[Supersquee]

I have an idea, not sure how well it will work or how practical it is but I think it might be an answer.
 The water is mainly evaporating because it has too large a surface area to cover, so split the bottom of the moat into smaller sections with walls. This will allow each section to fill and then overflow into the next with the water not evaporating from spreading out too far...or it should...I think...

Edit:
Damn just saw someone else had suggested this...I'll go back in the box.

[Ipwnurmom221]

There's the elf's way out: dfliquids

[Zifnab]

Just channel your moat a bit deeper and run a tunnel from inside it under the ocean.  Dig an upward ramp into the ocean from below.  If you use an agile miner, he might even live.

Spoiler (click to show/hide)

[caknuck]

Whatever method you use must be supplemented with a mass bucket brigade project. Designate a number of 1 tile pond zones equal to the number of available buckets. Make sure to use the ocean as your water source.

[decius]

Damming the river would probably be the fastest way. Digging down to below the top ocean level and providing a path for ocean pressure should fill the bottom layer instantly; the moat will be functional, even if it never fully fills.