Overview

What a Tipping Rain Bucket Does

A tipping rain bucket is fundamentally different from a traditional rain switch. While a rain switch simply detects the presence of rain and shuts off irrigation, a tipping rain bucket is a rain collector that provides detailed precipitation data.

Inside the rain bucket housing, there is a small lever mechanism that sits flat. As rain collects during a precipitation event, the lever tips back and forth. Each tip creates a closed contact switch that generates a pulse. The Baseline biCoder (similar to a flow biCoder) reads these pulses to measure precipitation.

The device is highly sensitive and can measure precipitation down to 1/100th of an inch within a minute. This allows the system to capture both the rate of precipitation and the total volume over time. The BL-3200 controller logs this data on a minute-by-minute basis and can display the previous hour's worth of rain data, showing both precipitation rate and collected volume at your site.

Why Tipping Rain Buckets Matter for Water Management

Managing irrigation during rain events is critical for both water efficiency and professional appearance. When irrigation systems run during rain, it wastes water and reflects poorly on site management. While managers might manually shut off controllers online or drive to sites to turn them off, this reactive approach provides no data about the rain event itself.

Traditional rain switches with disc-based sensors have a minimum threshold of approximately 1/8 inch of rain before they activate. In contrast, a tipping rain bucket can detect as little as 1/100th of an inch—nearly instantaneous detection that can pause irrigation almost immediately when precipitation begins.

The detailed data from tipping rain buckets enables advanced water management strategies. You gain insight into how much rain fell, for how long, and at what rate. This information allows you to correlate rainfall with actual soil moisture changes, understand effective rainfall (how much rain actually penetrated the soil profile), and create detailed reports for stakeholders about water usage and savings.

Unique Integration with Baseline Two-Wire Technology

What makes the Baseline tipping rain bucket implementation unique is the bi-directional communication capability of the two-wire system. Unlike traditional systems where devices only receive commands, Baseline technology transfers data back and forth between field devices and the controller.

The rain bucket connects to a BL-5407 biCoder, which can be located anywhere on your two-wire path—it does not need to be physically wired to the control box. This flexibility allows you to position the rain sensor in the optimal location on your site for accurate precipitation measurement.

Each BL-3200 controller can sync with up to eight different tipping rain buckets at a single site. This is particularly valuable in regions like the Gulf Coast and Florida where hyper-localized rain events can occur on one side of a property but not the other. Multiple rain buckets provide better resolution into precipitation behavior across your entire site.

Data Storage and Redundancy

The system architecture provides multiple points of data collection and storage. The biCoder itself functions as a mini-computer in the field, collecting, tracking, and logging precipitation data independently. When the BL-3200 controller requests data, the biCoder sends stored information packets back to the controller through the bi-directional communication system.

The controller then logs this data and, if connected to BaseManager and App Manager, sends the minute-by-minute log data to the cloud. This multi-level storage approach ensures data redundancy and provides multiple ways to access and use precipitation information.

Advanced Start, Stop, and Pause Capabilities

The BL-3200 controller offers sophisticated automation based on tipping rain bucket data through start, stop, and pause functions. These capabilities go beyond simple rain shut-off and enable next-level water management strategies.

Stop and Pause Functions: The controller monitors precipitation data every 15 seconds and logs it at the minute level. You can configure the system to stop or pause irrigation based on two main parameters:

• Rate: Measured in inches per hour (e.g., "If I see one inch of rain per hour, shut down irrigation because this is a heavy rainstorm")
• Volume: Total accumulation over a time period (e.g., "Over the last 60 minutes I've seen an inch of rain fall, so stop irrigating")

A pause is a temporary stop that will resume once conditions change, while a stop completely halts the program. You can set pause durations (such as five or 30 minutes) and then have the system re-evaluate conditions before deciding whether to resume.

Start Functions: Surprisingly, starting irrigation after a rain event can actually save water and improve efficiency. When soil receives an initial wetting—whether from rain or irrigation—it induces capillary action in the soil profile. Subsequent irrigation cycles then achieve better, more efficient penetration into the root zone. By initiating an irrigation cycle after a quick rain event, you can get more water into the root zone more quickly.

Another start application is pump evacuation. If you have a rain catchment container that needs to be unloaded to prevent overflow, you can initiate a pump program to evacuate water based on precipitation volume.

Establishment Zone Management

The fine-tuning capabilities are particularly valuable for establishment zones. With a traditional rain switch, irrigation might shut down just two minutes into a cycle after a brief drizzle, and then the rain stops a minute later. The newly planted turf area must then wait until the next program start time to receive water.

With tipping rain bucket pause functionality, you can set specific parameters for establishment areas. For example, you might configure the system to continue running even if an inch of rain falls, or to pause for only five or 30 minutes before resuming. This ensures critical establishment zones receive adequate water regardless of brief precipitation events.

Programming Simplicity

Despite the sophisticated functionality, programming the tipping rain bucket in the controller is straightforward. The interface looks and behaves very similar to other Baseline two-wire devices and sensors with start, stop, and pause capabilities (such as moisture and temperature sensors).

Configuration requires only two fields. The key is understanding your site's requirements and determining what precipitation thresholds you're comfortable with for each program. Since the rain bucket is a program-specific device, you can configure some programs to respond to rain data while others ignore it or use different parameters.

Product Configurations and Kits

Baseline offers the tipping rain bucket solution in three configurations:

• BL-5407 biCoder only: For customers who want to source their own rain bucket or have existing equipment
• BL-5407-KIT: An integrated solution with the rain bucket and biCoder pre-assembled and ready to install out of the box
• BL-RB400 "Pro" Kit: Includes the rain bucket, biCoder, and a BL-5311 mini compact soil moisture sensor

Why Combine Rain Buckets with Soil Moisture Sensors

The "Pro" kit combines a tipping rain bucket with a soil moisture sensor because there is significant value in correlating moisture data in the soil profile with precipitation data from the same location. This combination provides better resolution into the effective rainfall of a given rain event.

For example, a site might receive four inches of rain, but what did that actually influence within the soil profile? By directly associating the location of the rain event with soil moisture measurements, you can tell a much more complete story to stakeholders about your site over time.

Consider two scenarios where a site receives three inches of rain in a single month:

• Scenario 1: Three inches falls in a single heavy storm. The moisture sensor graph shows a big spike, but the soil quickly reaches field capacity. Additional rain creates runoff, and you don't get the benefit of the full three inches of precipitation.
• Scenario 2: Three inches falls over multiple events spread across several weeks. The moisture sensor shows multiple wet-down and dry-down cycles, indicating that the soil absorbed the water more effectively without exceeding field capacity.

This data allows you to measure effective rainfall—the amount of precipitation that actually benefits the landscape by reaching and not exceeding field capacity. You can then optimize irrigation by suspending or stopping future watering when soil is at field capacity, or by adding precisely the amount of water needed after a rain event to reach optimal soil moisture levels.

Why You Need Both Rain Sensors and Soil Moisture Sensors

A common question is: "If I already have a soil moisture sensor, why do I need a rain device?" Each sensor has a specific purpose and should be located where it can best sense what it needs to measure.

A soil moisture sensor must be buried in the soil to measure moisture at the root zone level. A rain sensor must be positioned in the air where it can collect precipitation. While a soil moisture sensor might eventually shut off irrigation during a rain event, it may take one to four hours for rainwater to penetrate the soil and reach the sensor depth—especially in clay soils where much of the water may run off rather than infiltrate.

A rain sensor positioned in the air can shut off irrigation as quickly as you configure it to respond. With the tipping rain bucket's sensitivity of 1/100th of an inch, it can detect precipitation events so light they may never penetrate deep enough to register on a soil moisture sensor, particularly if evaporation occurs before the moisture reaches sensor depth.

Each device excels at its specific task, and using both together provides comprehensive water management data and control.

Precipitation Rate Verification Use Case

An innovative field application for the tipping rain bucket is verifying sprinkler system precipitation rates. Because the device measures down to 1/100th of an inch with high accuracy, you can place it in a turf application, connect it to a controller on the two-wire path, and run your irrigation system.

The tipping rain bucket will measure the actual precipitation rate being delivered by your sprinklers, allowing you to verify coverage and ensure your system is set up to optimize performance. You could even use multiple units (up to eight per controller) to check precipitation rates and pattern uniformity across different zones or areas.

Since the main requirement is connection to the two-wire path, you can move the device from location to location for testing purposes without complex rewiring.

Compatibility with Substations and Geographic Distribution

The tipping rain bucket system works seamlessly with Baseline substation technology. Each substation can have its own rain bucket connected, and since a BL-3200 can support up to eight substations, you can effectively distribute rain sensing across a geographically large or complex site.

This is an excellent use case for wireless two-wire substation technology, allowing you to extend the geographical influence of a single BL-3200 controller while maintaining localized precipitation monitoring at each substation location.

Controller Compatibility

The tipping rain bucket with BL-5407 biCoder is currently compatible with the BL-3200 controller only. Future phases will include substation compatibility, with potential BL-1000 compatibility being evaluated for later implementation.

The device will not directly connect to conventional wire R-boards at the controller. However, since each R-board has a two-wire terminal, you can extend a short piece of two-wire from the R-board to connect the BL-5407 biCoder—similar to how flow sensors are connected. The rain bucket requires a dedicated two-wire connection back to either an R-board or a two-wire controller.

Note that the BL-5311 soil moisture sensor included in the Pro kit can connect to R-boards using the valve-over-moisture technology available on those boards.

Calibration and Maintenance

The tipping rain bucket does not require periodic calibration like soil moisture sensors. The BL-3200 controller reads the device directly without calibration automation.

You should periodically check the rain bucket to ensure debris hasn't fallen into it and isn't impeding the sensor's ability to tip. The system provides standard two-wire diagnostics, so if there's a "no connect" status or the controller isn't receiving data, you can troubleshoot whether it's a two-wire issue or a coder issue.

The BL-5407 biCoder has built-in LEDs for blink testing. You can physically inspect the device, check the wired connection from the biCoder to the rain bucket, and visually verify that the rain bucket is free of debris that might prevent proper tipping action.

Data Visualization in BaseManager and App Manager

Precipitation data collected by the tipping rain bucket is accessible through BaseManager and App Manager. The BL-3200 controller sends minute-by-minute log data to the cloud, where it can be viewed in Quick View and in the Analytics tool within App Manager.

You can also use the mapping feature in BaseManager to place rain bucket assets at their exact geographic locations on your site, providing visual context for precipitation data and helping you understand localized weather patterns.

To access the full suite of tools, log in through app.baselineapps.net rather than directly to BaseManager.net. This provides access to App Manager, where Analytics is located in the left tile menu, allowing you to view, report on, and export precipitation data.

Understanding "Rain is the Reason"

An important concept in water management is that rain becomes the primary variable affecting water usage once your irrigation system is optimized for efficiency. You could install the most efficient equipment available—smart controllers, high-efficiency nozzles, upgraded sprinklers—and still use more water the following season if weather conditions change.

For example, if the next year is a drought year, water usage will increase despite equipment upgrades. Clients who aren't as educated about irrigation management may only look at the water bill and question why usage increased after investing in expensive new equipment.

The tipping rain bucket creates a baseline for understanding water savings potential as it relates to rainfall. It allows you to see how your system is operating and performing in the context of actual precipitation. You can determine whether a rain event delivered three inches in one storm (with significant runoff and waste) versus one inch of rain every three weeks (with better soil absorption and effective rainfall).

This data helps you tell the complete story about your site's water usage and demonstrate that when irrigation systems are as efficient as possible, rain becomes the reason for variations in water consumption.

Video Walkthrough

Video originally published January 2021.

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