hold enough. I do not know if enough is a quantity a man can count on. But I know that today eleven children dug a hole in the shape of an idea, and the idea held water, and that is more than most ideas I have met have ever done."
The next morning, Selma came before school with a basket of bread, and she and Eben ate standing at the edge of the pond, and she told him about the ditch the way a teacher tells a pupil about a lesson that matters: it had to fall no more than a finger's width in every ten paces, or the water would cut, or sit and breed mosquitoes, and the whole art of it was in finding the fall that let the water walk. Eben, who had dug ditches all his life by eye, listened the way he had once listened to his father explain grafting, and when the water walked through the ditch the second time, slow and steady, he felt a small, private satisfaction that had nothing to do with winning a wager and everything to do with having done a piece of work exactly right.
The ditch was harder. It had to run from the headgate on the creek, across the corner of Eben's upper ground, and down to the pond, and it had to fall gently, a little at a time, so that the water would walk instead of run. Selma laid it out with twine and the level, the same way she had laid out the pond, and Eben cut it with a spade, and the older boys carried the spoil away, and twice they had to start a section over again because the fall was too steep and the water, when they tested it with a bucket, ran too fast and cut the sides of the ditch. Selma did not scold them for the mistakes. She showed them, with the level, why the water had cut, and she had them fill the section in and cut it again, shallower, and when the water walked through it the second time, slow and steady, she wrote that down too, and the boy Nico, who had been watching the water with his chin in his hands, said, "It walks like it knows where it is going," and Selma said, "That is because we told it, and we told it true."
It took nine days to finish the pond and the ditch, working after school and on Saturdays, and on the tenth day they opened the headgate a crack, just a crack, and watched the water come down the ditch in a thin bright thread, and pool in the bowl, and rise, slowly, until it covered the clay bottom and lapped at the low lip on the downhill side, and then Selma closed the gate again, and the pond sat there in the lower field, small and still and full of sky, and Eben thought it looked like a promise a man could keep.
Before the storm came, there was the first release, and Eben would remember it for the rest of his life, not because it was dramatic, but because it was so quiet that it felt like a secret. Selma opened the release gate on a Tuesday morning, just a finger's width, and the water slipped out of the pond and down the staggered ditch in a thin, deliberate thread, and it spread across the trial field in a slow sheet, and it sank into the ground instead of running off the end of the field the way flood water always did. Eben knelt and pushed his hand into the soil an hour later, and the soil was damp six inches down, evenly, the way soil is damp after a good rain, and he looked up at Selma, and she was writing in her notebook, and she did not look up, but she said, "Six inches, Eben. Write it in your journal. Six inches, from one release, and the pond still half full."
He wrote it in his journal that night: "Release one: six inches damp, even, pond half full." And in the days that followed, the trial field stayed green while the comparison strip, watered the old way, went through its usual cycle of flood and dry, and Eben began to understand, in his bones rather than in his head, what Selma's numbers had been trying to tell the valley all spring: that water does its best work when it is allowed to go a little at a time, over a long season.