We build artistic water features, a creative process of continual reassessment. The placement of each rock affects every rock it touches, and the way the water flows around them. In this process we discover the best combination of elements, and occasionally discover unseen obstacles which increase the cost: things like buried tree stumps, abandoned pipes, drains, or unseen boulders. We’ve even uncovered an abandoned asphalt roadway in a planter we were digging. So while using this cost estimator, remember that there may be unforeseen obstacles which we will need to negotiate during the completion of your project. Only death & taxes are guaranteed.