W. P. Law, Incorporated - Fluid Handling Professionals

Jump to Irrigation Resource Topic:

Got irrigation questions?  We've got answers!  The staff at W.P. Law Inc. has assembled information designed to help customers find solutions to their irrigation problems.   With over 40 years of experience in the irrigation industry, we've compiled information to help answer common and not so common irrigation questions.  Whether you are planning to install a new irrigation system or maintaining an existing one, our extensive resource page will help guide you through the process. 

Garden/Shrub Drip Irrigation-  Want to know how to layout a drip irrigation system for your garden or shrubs?  Our detailed diagram shows what components you will need and how they fit together.

Wiring-  Learn how to wire common irrigation components such as valves, pump start relays, doublers, and isolators.  Diagrams are also included for more complex applications such as pumping out of cisterns, wiring multiple irrigation controllers to a single pump, and using a pump start relay in conjunction with a pressure switch to control a pump.

Sprinklers-  Look up the performance of various sprinklers to determine flow rate, pressure requirement, and distance of throw.

Controllers-  This page has user manuals for all the irrigation controllers W.P. Law Inc. stocks.  Manuals include programming instructions and wiring details.  In addition to irrigation controller manuals, there are also manuals for rain sensors, freeze sensors and weather stations.

Valves-  Find specific information on irrigation valves such as parts breakdown, pressure loss charts, troubleshooting, and installation instructions.

Troubleshooting-  The W.P. Law Inc. irrigation troubleshooting guide gives step-by-step instructions on how to diagnose problems with valves and controllers.  Easy to follow flow charts help guide individuals to pinpoint irrigation problems. 

Calculators-  Want to know how much flow to expect from your city water meter or what size irrigation pump to use to water your landscape?  Our hydraulic calculators take the guess work out of your next irrigation project.   These unique calculators help individuals size irrigation components properly to ensure their system works properly. 

Pumps-  Find specific information on the pumps W.P. Law Inc. carries.  Information includes parts breakdowns, troubleshooting, pump selection calculators, performance charts, and determining flow from submersible well pumps.

Piping-  Find specs for various types of pipe.  Calculate friction loss (pressure drop) in piping at different flow rates.  Information included also gives detailed information on various types of cements and primers for PVC pipe.  Additional information includes thrust-blocking details for gasketed pipe.


Find A Location Near You!


303 Riverchase Way
Lexington, SC 29072

Phone 803-461 -0599
Toll-Free 800-476-4515
Fax 803-461 -0598
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8:00am - 5:00pm 

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3636 Belvedere Rd.
John's Island, SC 29455

Phone 843-559-3945
Fax 843-559-2740
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8:00 am - 5:00 pm


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1330 Grove Rd.
Greenville, SC 29605

Phone 864-295-3810
Fax 864-295-6990
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8:00am - 5:00pm


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2400 Highway 101 S.
Greer, SC 29651

Phone 864-879-1045
Fax 864-879-1 046
Contact Us


7:30am - 5:00pm


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