August in Clifton Park can go dry and brassy, the Dwaas Kill running low under its little bridges while lawns fade toward straw. All Green Lawn Sprinklers thinks about water for a living — irrigation lines started up in spring, heads adjusted so the spray lands on grass instead of sidewalk, systems blown out before the first hard freeze comes down off the Adirondack foothills. Between those bookends comes the ordinary care that keeps a lawn worth watering: mowing, trimming, feeding, the beds kept sharp. Green in the third week of August is not luck, it is a schedule kept. The route covers Clifton Park and the neighboring stretches of Halfmoon, Rexford and Ballston Lake.