Your Lawn Water Needs – Houston, TX

Are you wondering how much water lawn need? Houston Landscape Pros has conveniently put together this lawn water needs Texas page. We discus and share important information regarding your lawn’s water needs. One of the first things a professional lawn sprinkler system installer learns about is to calculate the water requirements. In other words, for the lawn (grass or turf) and other plants. Below, we will explain how to determine the amount of water required for a particular grass (lawn/turf). Please note that plant requirements are different and vary depending on plant type and climate. Our focus is on the Houston, TX area and neighboring communities, including Katy, Sugar Land, Richmond, and more.

If you would like to make an appointment, please speak to our friendly staff at (713) 396-3320.

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Lawn Watering Requirement Formula

The formula for calculating the lawn water requirement is listed below. We will define each part of the formula and explain what each variable means.

Lawn Water Requirement = PET x Tc x Qf. Please refer to the charts below and the formula definitions at the bottom of the page.

Quality Factor (Qf)
No Stress (100% Growth)1.0
Low Stress0.8
Normal Stress0.6
High Stress0.5
Very High Stress0.4
Turf Coefficient Values (Tc)
Warm Season Turf (ie. St. Augustine)0.6
Cool Season Turf (ie. Rye Grass)0.8
Houston lawn water requirements irrigation

Definitions for Formula Coefficients:

PET (aka ETo) is short for “Potential Evapotranspiration”. This is the measurement of the total amount of water that a plant needs to grow.

Tc is the turf coefficient for a specific grass. In other words, it is the water requirement for the specific type of grass calculated as a fraction of the PET.

Qf is the quality factor. This is a fraction of the PET used to maintain a certain grass quality. In residential applications, you are looking for the lawn to show a good appearance. That can be achieved without reaching full growth potential.

The figures we provide apply to Texas. Please visit TexasET network to learn more of how these figures are calculated, what assumptions are made, and what methodology is used to come up with these values.

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Professional Sprinkler System Installation in Houston

Our main service area for lawn sprinkler system in Houston are, The Galleria, Katy, TX, Richmond, TX, and Bellaire, TX. Please fill out a irrigation system form or call us at 713-396-3320 and tell us a little more about your lawn sprinkler needs or repairs.

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