Reviewed August 2026 against USDA NASS, USDA ERS, and UC ANR (University of California Agriculture and Natural Resources).

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Salt River Project Irrigation Schedule: Data, Rules & Microjet Guide

By Farmonaut Research & Content Team · Published 8 February 2026 · Updated 28 September 2026

A Salt River Project (SRP) irrigation schedule is the delivery order that tells a shareholder or irrigation-district user when water arrives at their turnout, in what volume, and on what rotation — it is set by SRP’s water operations group based on canal capacity and demand, not by the grower. Growers who want to change how much water a given schedule actually needs on the ground do that with irrigation scheduling: soil-moisture and evapotranspiration-based timing that decides how a delivered allotment gets applied. Microjet irrigation is one of the delivery methods that changes how far that allotment stretches. This article separates those three things clearly, gives the numbers USDA and university researchers have published on each, and tells you exactly where to check for a current figure when ours ages out.

Understanding the Salt River Project Irrigation System

SRP delivers water from the Salt and Verde Rivers to shareholders and irrigation customers across the Phoenix metropolitan area under a water-rights and canal-delivery structure that predates most other US irrigation utilities — its irrigation district roots go back to the 1903 organization that financed Roosevelt Dam. The specific figures a grower needs — total service-area acreage, current canal delivery schedules, and turnout-specific rotation days — are published and updated by SRP itself, not by a third party, because they change with reservoir storage and district-level allocation decisions each season.

SRP publishes the general delivery rules in its SRP Residential Irrigation Owner’s Manual, summarised in the next section. For your own parcel, the dates come from SRP My Account, the SRP Water app or SRP’s Water Contact Center. SRP is a political subdivision of Arizona and its elected board sets its prices; the Arizona Corporation Commission does not regulate them (SRP pricing FAQ). If you manage acreage under SRP delivery, your account representative can also confirm your turnout’s rotation days directly — that number is account-specific and won’t appear in any general guide, including this one.

What we can verify independently is the broader Arizona picture those schedules operate inside. The University of Arizona College of Agriculture and Life Sciences (CALES) tracks water applied to the state’s largest irrigated crop, cotton, over time: growers applied 4.9 acre-feet per acre in 1984 against 4.2 acre-feet per acre by 2023 — a reduction driven by exactly the scheduling and delivery-method changes covered below, not by growing less cotton.

How the SRP irrigation schedule works for homeowners

Most people searching for the SRP irrigation schedule have flood irrigation on a residential lot. According to the SRP Residential Irrigation Owner’s Manual, the basic rhythm is:

• Summer (April to September): deliveries to each neighborhood about every 14 days.
• Winter (October to March): about every 28 days.
• Canal maintenance: no scheduled deliveries during the annual dry-up. SRP says its Consolidated Canal dry-up runs from late November to late December and early January to early February, depending on location.
• Round the clock: water is delivered 24 hours a day, seven days a week, including holidays, so your turn may come at night.

Finding your dates. SRP keeps a list of important dates for each irrigating neighborhood: delivery days, the order deadline and when the schedule is released. Check SRP My Account, the SRP Water app, or call the Water Contact Center at (602) 236-3333.

Ordering. Water is ordered in five-minute increments up to your maximum allocation, which depends on your acreage and water rights. SRP suggests ordering two to three days ahead, as most scheduling is done a day in advance. Change or cancel before the deadline; late changes can flood neighbors. Subdivision accounts receive 18 irrigation runs a year.

Irrigation Scheduling: The Method Behind the Numbers

Irrigation scheduling is the decision process for when and how much water to apply to a crop, using evapotranspiration rates, soil-moisture readings, and crop growth stage instead of a fixed calendar. The method itself is durable even as sensors and software change around it — it rests on three inputs that any grower can check regardless of which vendor’s tool they use:

• Evapotranspiration (ET) rate: how much water the crop and soil surface are losing to the atmosphere on a given day, usually pulled from a regional weather-station network.
• Root-zone soil moisture: measured directly with in-field probes rather than inferred, so the schedule reflects what’s actually in the soil, not just what the forecast predicted.
• Crop growth stage: water demand shifts sharply between germination, vegetative growth, flowering, and maturity, so the same ET rate calls for a different volume at each stage.
• Try it: Run your own numbers

Nationally, the shift toward this kind of scheduling shows up in USDA’s own irrigation technology data. In 2023, USDA NASS counted 53.1 million acres of irrigated cropland across 212,714 US farms operating irrigation systems. USDA’s Economic Research Service (ERS) tracks the delivery-method side of that shift separately: across 17 western states, pressure-application systems — sprinkler, drip, and microjet combined — went from 29% of irrigated acres in 1984 to 59% by 2013. By 2023, pressurized systems covered 75% of irrigated acres in the 17 western states, up from 69% in 2013 on ERS’s current definition (USDA ERS).

Irrigation Project Oversight: Sensors, Data, and Verification

“Irrigation project oversight” — whether it’s a farm manager, a district engineer, or a lender’s field agent doing it — means verifying that a schedule is actually being followed and that delivered water is producing the expected crop response. That verification job has five concrete data sources, and none of them require guessing:

This is the durable checklist for verifying any irrigation schedule, on SRP-served land or elsewhere: pull the ET number for the date range, compare it against the soil-moisture reading, check whether remote-sensing stress flags line up with either, and reconcile against the metered delivery record. If those four data points agree, the schedule is working; if they diverge, that’s where oversight staff should look first, regardless of which software dashboard displays them.

Microjet Irrigation Guide: What the Data Shows

Microjet irrigation applies water through small, fixed emitters that spray a fine, localized pattern directly over the root zone, rather than broadcasting it overhead or flooding a furrow. Because the water lands close to the ground and is broken into fine droplets, less is lost to wind drift and evaporation before it reaches the soil. The clearest field evidence on this comes from UC ANR (University of California Agriculture and Natural Resources) strawberry trials, a crop with a well-documented water budget: full-season strawberry irrigation demand under US growing conditions runs 24-29 inches of water, and UC ANR’s peer-reviewed field trial found microjet irrigation cut water use by 32% compared to conventional overhead sprinklers on that crop. Over a 3-week trial period, that translated to 38,400 gallons conserved per acre.

Where Microjet Systems Perform Best

What we do not have is a peer-reviewed installation cost figure for microjet systems on a per-acre basis — the research available for this article found none. That number moves with emitter density, pump capacity, and local labor rates, so it needs a live quote rather than a general figure; see the distributor section below for how to get one for your acreage.

Comparison Table: Traditional vs. Microjet Irrigation

The clearest way to see the difference is side by side, using the two figures that are actually documented — Arizona’s statewide cotton water-use trend and UC ANR’s controlled strawberry comparison — rather than a single blended number that hides which crop and region each side of the comparison represents.

Why the Gap Is This Wide

• Overhead and flood methods lose water to evaporation and wind drift before it reaches the root zone; localized emitters largely avoid that loss path.
• Pressure-application systems allow scheduling to control exact volume per cycle, where flood delivery is constrained by field grade and furrow length instead.
• The 35.1% figure from the China wheat meta-analysis held without yield loss, meaning the water reduction is not being achieved by stressing the crop — a distinction to check for in any vendor’s claimed savings figure.

Irrigation Water-Savings Calculator

Use the UC ANR-documented 32% microjet savings rate and your own acreage and current water cost to estimate what switching from overhead sprinkler to microjet could save on your operation over a chosen irrigation period.

Finding an Agriculture Equipment Distributor for Microjet Systems

Because no peer-reviewed source publishes microjet installation costs or a national distributor directory, sourcing equipment — including for buyers searching near Middletown or any other specific area — comes down to three verifiable channels rather than a single link:

• Local Chamber of Commerce or county agricultural extension office: most maintain a directory of registered equipment dealers serving their district, and can confirm which distributors currently stock microjet and drip components.
• State department of agriculture business directories: several US states publish searchable lists of licensed agricultural equipment and irrigation suppliers by county.
• Manufacturer dealer locators: major microjet and micro-sprinkler component manufacturers publish dealer-locator tools on their own sites, which will show the nearest authorized distributor and let you request a quote for your acreage directly.

Request quotes from at least two distributors before installing, since emitter density and pump sizing — the two biggest cost drivers — depend entirely on your field layout and are not standardized across suppliers.

Sustainable Equipment: Battery-Powered Tools in Irrigated Operations

Irrigation infrastructure maintenance — clearing canal-side vegetation, orchard pruning near microjet lines, trimming around buried drip tubing — increasingly uses battery-powered tools instead of gas-powered equipment, particularly where irrigation lines or urban-adjacent farmland make emissions and noise a bigger operational concern.

• 🔋 Emission-Free Operation: Removes exhaust and fuel-handling near irrigation infrastructure and water sources.
• 🤫 Quiet & Convenient: Lower noise output matters in Sunbelt urban-adjacent operations bordering residential zones.
• 🌎 Low Maintenance & Portable: No fuel mixing or engine servicing simplifies use across scattered irrigation turnouts.
• ⚡ Fleet-Trackable: Battery equipment pairs with fleet and equipment tracking the same way pumps and vehicles do, giving one system of record for maintenance-equipment location and battery status across a property.

How Farmonaut Supports Irrigation Oversight

The oversight checklist in this article — reconciling ET, soil moisture, remote-sensing stress flags, and delivery records — is exactly what satellite-based farm monitoring platforms are built to consolidate into one view, whether the irrigation source is SRP delivery, a private well, or a district elsewhere.

• 🛰️ Satellite-Based Monitoring: Multispectral imagery for crop-health indices like NDVI, soil condition, and field-level stress mapping.
• 🤖 AI-Based Advisory: Jeevn AI surfaces irrigation-timing signals and weather-forecast context alongside field imagery.
• 🔗 Blockchain Traceability: Product traceability tools document the water-and-input record behind a harvested crop.
• 💼 Fleet & Resource Management: Equipment and vehicle tracking for irrigation and maintenance fleets.
• 🌱 Environmental Impact Monitoring: Carbon footprinting tools for irrigation and input-use reporting.

Developers and irrigation-system integrators can connect field data directly through the Farmonaut API (documentation at this developer docs page), which lets third-party scheduling or SCADA-style delivery systems pull satellite and weather data without building their own ingestion pipeline.

Operations financing irrigation upgrades against expected yield gains can also review the crop loan and insurance verification page for how satellite records support that documentation.

Verification Checklist for Any Irrigation Schedule

• 🌎 Confirm the delivery source's current numbers directly — for SRP, that means srpnet.com or an account representative, not a general guide.
• 📊 Pull ET and soil-moisture data for the same date range before deciding a schedule needs adjustment.
• ⚙️ Check remote-sensing stress flags against the delivery log to catch under- or over-application early.
• ⚡ Re-quote equipment costs locally rather than relying on a national average, since none exists in published research for microjet systems.
• 🛰️ Re-check USDA NASS and ERS figures on their update cycle — NASS runs its Irrigation and Water Management Survey every five years, after the Census of Agriculture; the 2023 results came out on 31 October 2024 (USDA NASS).

Farmonaut Subscription Plans

Whether you're overseeing a single SRP-served parcel or a multi-region agriculture operation, Farmonaut offers tiered satellite-analytics plans sized to acreage and monitoring needs.

FAQs: Salt River Project Irrigation & Microjet Systems

Keeping This Schedule Current

Three things in this article will change on different clocks, and knowing which clock applies is the actual takeaway. SRP's specific delivery schedule for your turnout changes with reservoir storage and district decisions each season — get it from srpnet.com or your account representative, not a blog post. USDA NASS's national irrigation figures, including the 53.1 million irrigated acres and 212,714 irrigating farms counted in 2023, come from a survey run every five years (USDA NASS); the 2023 results were released on 31 October 2024. USDA ERS's technology-adoption trend and UC ANR's crop-specific water-use research update on their own publication schedules, and both are worth rechecking before relying on a savings figure for a budget decision.

What doesn't change is the method: reconcile ET, soil moisture, remote-sensing stress, and metered delivery before judging whether a schedule is working, and re-quote equipment locally rather than trusting a national average that doesn't exist yet in published research. That checklist holds regardless of which year you're reading this, which is the point of building it that way.