Do you have great water pressure but your sprinklers are not performing?

In this video, Andy talks about the 2 key components of pressure which are known as STATIC water pressure and DYNAMIC water pressure. These terms are important to understand as it relates to designing an irrigation system or troubleshooting an irrigation system, especially when it comes to pipe sizing and knowing how many sprinkles to put on a zone.

00:00 Introduction
00:10 Static vs Dynamic Water Pressure
01:27 What is static water pressure?
03:20 What is Dynamic Water Pressure?
05:30 How Much Pressure Is Lost In A Sprinkler System?
06:43 How do you calculate static pressure in an irrigation system?
09:59 Static Pressure VS Dynamic Pressure
10:36 Outro

Pressure Loss Charts (courtesy of Hunter Industries):
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Summary:

#1 - STATIC Water Pressure:

STATIC water pressure is the pressure on the system when the water is motionless - when the water is not moving - when everything is turned off. You can measure the STATIC water pressure using a pressure gauge attached to the hose bib on your home, and you will need to make sure all the water in the home is OFF.

STATIC water pressure is the pressure when the water is motionless and what's important to know is that in a level piping system, STATIC water pressure is the same everywhere - the pressure is the same at the beginning of the system as it is at the same at the end of the system. The only difference in pressure is going to be due to elevation changes - the pressure at the top of the hill will be lower than the pressure at the bottom of the hill because of the force of gravity. Gravity is the only force that can change STATIC water pressure. Pressure loss or gain due to gravity is about ½ pound per foot of elevation change, or to be exact, it is actually 0.433 lb/ft.

#2 - DYNAMIC Water Pressure:

DYNAMIC water pressure is measured when the water is moving. This is also referred to as OPERATIONAL pressure or WORKING pressure, and it is the pressure taken at any point in the system while the irrigation system is running. The reason that you want to understand this concept is that when water moves through a pipe, it is affected by the components of the piping system, as well as the size of the pipe. Devices such as water meters, backflow preventers, and sprinkler valves, all create FRICTION, which reduces the DYNAMIC water pressure. The size of the pipe will also create friction and reduce the DYNAMIC pressure. This concept of friction is commonly referred to as FRICTION LOSS, or, DYNAMIC pressure loss due to friction.


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