Welcome to the North Valley Ag Services irrigation calculator!

The agricultural producer that has never used an irrigation system is the demographic for this simple tool. Using evapotranspiration information from CIMIS this calculator is meant to be used as a guide for your general irrigation management.

What is Evapotranspiration?

ET = The sum of Evaporation of water from the soil surface plus Transpiration (water loss) from (primarily) leaves of plants. A: ETo = "Reference ET" = The amount of full water use by a well irrigated crop. ETo varies daily with changes in temperature, relative humidity, solar radiation and wind.

What is CIMIS?

CIMIS is an integrated network of more than 80 computerized weather stations located at key agricultural and municipal sites throughout California. The system is operated by the California Department of Water Resources. CIMIS helps agricultural growers and managers of large turfgrass areas such as parks and golf courses develop water budgets for determining when to irrigate and how much water to apply.

History and Description

North Valley Ag Services is a grower-owned cooperative that is dedicated to the success of our customers and to helping growers in our region. Built upon a rich history spanning nearly seven decades, we offer innovative products and services selected to best serve the needs of our agriculture community in Northern California.

We’ve been pleased over the last three years to be awarded a USDA Risk Management Education Partnership Program grant which has provided opportunities to further educate growers in our region about how to more effectively manage risk. The purpose of this program is to deliver crop insurance education and risk management training to U.S. agricultural producers to assist them in identifying and managing production, marketing, legal, financial, and human risk.

In 2018, in addition to a video that was the outcome of two on-farm field days, we are pleased to provide this resource to walnut and almond growers in the region. Our intent is to assist the grower on how to better mitigate production and financial risks through training on irrigation and limited irrigation best practices in the aftermath of drought.

Our Thanks To:

  • Catharine Anderson

    Risk Management Specialist
    Risk Management Agency
    Davis Regional Office

  • Agnes Douglas

    Grants and Agreements Specialist
    Risk Management Education Division
    Risk Management Agency

  • Hal Crain

    Crain Ranch

  • Allan Fulton

    University of California Agriculture and Natural Resources

  • Ken Shackel

    Department of Plant Sciences at UC Davis

  • Bruce Lampinen

    Statewide Orchard Systems Specialist in UC Cooperative Extension

  • Ryan Kaplan

    Owner/Developer, Pressure Bomb Express

  • Lastly we would like to express our heartfelt appreciation to our grant consultants who have been immeasurably helpful through the North Valley Ag Services’ grant odyssey:

  • Hilary Tricerri,

    Toni Scott,

    Morrison and Company