You are welcome to purchase this app however it has been superseded by Sprinkler Surveyor Touch which is cheaper and easier to use.
Sprinkler Surveyor is a layout tool to help the professional or do it your self-er plan out the layout of their sprinklers. Sprinkler parameters (throw, angle, placement) and property layout parameters (boundary points) are entered and a scrollable drawing is produced showing the coverage of the combined springier patterns.
By the Way... Check out my other applications: Audio Surveyor and (for the iPad and iPhone) and NickNamer for the iPhone.