According to Geitir, the waterflow from the canal has been staunched for several days, and the builders have not replied to his message requesting assistance.
'The water has not been flowing down to Noglond for several days. I sent a message back to the Halls, but I've not received a reply from the builders. I'm not about to send one of my boys to do builder's work, and I can't have them trapessing to the river every time we need water.
'Would you look into it? The canal runs all the way down the mountain from Thorin's Halls and to Gondamon below. The problem must be up-river from here.
'The above-ground part of the canal, the place that may be blocked, is south and west of here. Just take the road south to the bridge and look underneath it. Follow the canal all the way up to the big gate if you have to, just find the problem!'
The canal can be found south of Noglond, flowing down from Thorin's Halls.
Geitir asks you to investigate the flow of the canal to Noglond and learn the cause of the problem.
There are thickets blocking the canal between Noglond and Thorin's Halls.
Now that you have discovered the problem in the canal, you should clear away enough of the thickets to allow the water to flow more freely. There may be several patches of thickets along the canal.
Geitir is at Noglond to the north of the canal, south of Thorin's Halls.
You should return to Geitir with news of your success.