After the walk to Denham, drawing the river environment 
and measuring river flow, it was time for lunch.
Unfortunately there was another school party there, 
so we could not sit on the veranda. 

Then it was time to set off for the Grand Union Canal and Denham Deep Lock.

We were able to see a boat pass through the lock.

On the journey back we stopped at the bridge over the canal to draw a canal scene.