5. Add concrete to the imprint of the gutter: line with paper or plastic, add concrete, reinforce, compact and finish

The same method applies for adding concrete to the imprint for the gutter. When adding scrap to reinforce the concrete, take care these bits of wire or sheet metal are not pushed in so hard, that they stick through the concrete into the dirt of the imprint.
All concrete casts shoud get ample time to set and harden. In the mean time keep them wet and prevent damage by animals.

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