Following are several letter's of Reference from Rain Bird, Toro and from Clients. All of these letter reference the type of installation and design engineering work that I've done over the 40 years I've spent in this industry. There are a lot of irrigation designer's available, not one of which has either the actual field installation or technical experience that I have, which I put to use on the new irrigation design I work on. For example, we design the hydraulics in the pipe network so as to minimize the overall cost of PVC Pipe, we also design around materials that are the very lowest possible cost for long term maintenance costs. Other designer's typically design around the materials they sell, which is a conflict of interests, we are a completely independent design firm only dependent on the needs of our client!
For example, ask any irrigation consultant who owns their company or to provide you with a list of ownership, you'll find most likely either a manufacturer or a wholesale distributor owns the design business these designer's work for.