Please check out algae ?

Please check out algae question posted Aug 4. I posted for more information. My adept builder won't hardly look at "the narrowing stream," he just wants to build the house, so I put every one on tech. Need I buy more than farm level 2 to get him to build?
Caroline

Hi CarolinePC and welcome to the pond! I couldn't find your original post but this is all I could find about the dam and adept builders..


The Dam

Once you reach Level Two Engineering, drop a builder on the rocks just above the pool of water in the southeast corner of the island. They will construct a dam to irrigate the fields to the immediate left so that crops can be planted. This will also uncover an ancient mosaic on the ground, the site of a later puzzle.

The Scarecrow

This puzzle requires the completion of the dam above. Once you plant your crops, you need a scarecrow to keep the parrots away. Drop an Adept-level (or better) farmer on the twisted pieces of wood and vine just below the rock pile in the north center of the map. You'll need to do this twice.

That was it, the engineer level.

Thank you so much, and thanks for the welcome!