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Garden Ponds
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Irrigation Techniques
POC, Water Volume & Pressure in Irrigation
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ProGardenBiz Landscape & Garden Magazine for the Green Industry
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Article by Isidoro Hernandez
That Right POC -
Point of Connection
Every once in a while I have an irrigation contractor that tells me the irrigation system he just installed is not performing as designed. The sprinklers just don't have the radius they are supposed to and the impulse heads just dribble. The POC (point of connection) is generally the cause of this type of complaint.
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In a residence, tapping into the water source after the pressure regulator or at a hose bib has to be two of the worst POC's from which to work. The problem with tapping in down line from the pressure regulator is that the unit is preset for indoor plumbing needs. This pressure is generally not adequate for proper irrigation system operation. In addition, any tampering with the pressure regulator to increase the pressure could result in serious damage to indoor plumbing fixtures.
The trickiest POC is the dreaded hose bib because its the most accessible. It is also deceptive. The hose bib could give you a pressure reading of 70 PSI when you connect your pressure gauge, but it could lack the volume you need to supply your valves... and volume is what you need at this point.
Before I go any further, let me explain the relationship of volume and pressure. What happens when you fill a funnel with water? The water comes out of the nozzle of the funnel fast and hard. This is because there is more pressure at the bottom of the funnel than at the top. The bigger the funnel's cup the faster and harder the water comes out the nozzle. With this in mind you need to locate the equivalent in the water source for your POC. This means locating the water source with the highest constant pressure available. This can be found in the line between the meter and the pressure regulator.
In a residential area this line is generally of a copper or PVC material from 3/4" to 1" in diameter. In some new housing tracts a poly—pipe in tube sizes is being used with more frequency. In any case, a successful and simple POC can be made with a pressure coupling.
After making a connection at this point you should test the pressure with a pressure gauge. This will give you a more accurate reading and a truer idea of the kind of water pressure that is available. Following this rule of thumb you could lay out a more efficient system for your customer.
Técnicas De Irragación
El Punto de Conección
Cada de ves en cuand, llegan aqui conmigo, uno o dos clientes mios, que desean, que su sistema de riego qué, ellos acaban de instalar, no riega, como ellos lo diseñaron.
El problema es casi siempre lo mismo se equivicarón, en sus calculos de punto de conección, quiero decir, no calcularon que tanta presion de agua hiban a necesitar para operar su sistemo de riego;
Tampien otro de las fallas, que se sucitan es que, en donde hicieron su conección; Fue de la llave de manquera, que viene siendo, el peor punto de conección. Antes de continuar, quiero aclarar lo que significa, punto de conección. La mejor definicion, biene siendo, donde se puede sacar el agua para sutir las mismas llaves de riego. Como puede ser, una linea de agua pue da servicio a una casa habitacion o un edificio commercial etc.
Bueno ya aclarando este sentido, vamos a, solucionar este problema, digamos que vamos a instalar, un sistema de riego en una casa residencia;
El primer paso seria localizar el medidor de agua, que casi, siempre se encuentra a esta localizado, frente a la casa, en la banqueta. Despues de en contralo, vamos a seguir la linea de agua que viene desde el medidor asi, a la casa, ya estando seguros, por donde viene y corre la tuberia. Tenemos, que buscar el mejor lusar dentro de estos dos punto (la casa y el medidor) para empesar a escarbar para descubrir y saber la mediday tipo, de tubo, que da sericio a la casa (residencia) lo probale es que, la tuberia sea de cobre de 1" o 3/4" de pulgada, de diametro esto es en una zona residencial, tambien puede ser en diferentes casos de PVC o polieteleno, cualquiera que sea, aqui es donde debe de ser su punto de conección.
Empesando se puede utilizar una abrasadera, como una "T" de compresion o una "T" sodable, todo depende en la clase de tubo que exista. Ya hecha la conección, podemos insertar un manometro, para medir la presion de agua. Ya determinado con que tanta presion disponible y existante, usted puede desde alli calcular. Un sistemo de riego que la va a dar el mejor resultado cien por ciento sin problemao de falta de presion.
For more of Irrigation Techniques read previous installments of this column in our magazine archives.
Isidoro Hernandez is an irrigation specialist in San Diego.
If you have any questions, or comments, or need some advice regarding irrigation, please write to us. Send us an email. Please include your name and address. We reserve the right to edit letters.
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Business Inspiration
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