Hydrology Services is a TCEQ & NDS certified and insured Landscape Irrigation Drainage & Erosion Control Contractor. Offering Design Services, New Installs, and Repair Services to Arlington, TX, & surrounding DFW Area. Residential and commercial Services. We work hard to solve your routine and new irrigation & drainage requirements in a cost effective affordable manner. Specializing I n French drain installations and storm water management. Give us a call for free estimates and consultations for your Landscape Irrigation and Drainage needs.