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6. Determining Programmable Settings
Rain Bird
®
ET Manager Series - Installation and Operation Manual 46
Available Days
The days available for watering can be programmed in
your ET Manager or in your sprinkler controller.
Typically Available Watering Days are set to “all” or
everyday. Examples of limiting available days include
scheduled maintenance, facility use, or local watering
restrictions. Depending on your watering situation,
your ET Manager can be programmed to water on:
• All days
• Even days
• Odd days
• Odd days with the 31 of the month off
• Custom days
Advanced Settings
Effective Rain Settings
Not all rainfall is effective rain. Rain that falls too quickly
will run off before reaching the root zone, and rain that
falls when the soil is completely saturated will run off as
well. Soil infiltration is the rate at which water enters the
soil. Different soil types have different intake rates. The
Effective Rain Settings in the ET Manager are based on
soil intake rate and soil moisture saturation limits.
Maximum Hourly Rain: The Maximum Hourly Rain
is the maximum amount of rain that should be accept-
ed each hour in the soil moisture level. See Table 4 to
estimate the Maximum Hourly Rain according to your
soil type.
Saturation Allowance: The Saturation Allowance is
the amount of rain it takes to saturate the soil after sat-
isfying the Irrigation Amount and before runoff occurs.
Saturation Allowance settings are typically half the
Irrigation Amount.
Normal watering cycles bring the soil moisture level to
field capacity. Heavy rainfall will bring the soil moisture
content beyond field capacity to a saturated level (see
Figure 14). Additional rainfall beyond this limit can
percolate below the root-zone or run-off, and may not
be available to the plant. The Saturation Allowance set-
ting represents the difference between field capacity
and saturation. The ET Manager uses this amount to
limit the total amount of rain that can accumulate in
the Moisture Level.
Saturation Allowance + Irrigation Amount – Current
Moisture Level = Total Allowed Rain
For example, if it rains 1.00”, only 0.65 “of rain will be
counted as effective. If the Saturation Allowance is 0.25
“ plus an Irrigation Amount of 0.5” minus a Current
Moisture Level of 0.10” = 0.65” of Total Allowed Rain.
Note: A general guideline is to set the Saturation
Allowance to half the Irrigation Amount.
Soil Type Max Hourly
Rain
(inches)
Clay 0.10
Silty Clay 0.15
Clay Loam 0.20
Loam 0.35
Sandy Loam 0.40
Loamy Sand 0.50
Sand 0.60
Information from Soil Conservation Service Nation
Engineering Handbook, September 1997.
Table 4. Guide to Determine
Maximum Hourly Rain
Readily
availab le
water
Saturation
Saturation Allowance
Field Capacity
Gravitational Water
(rapid drainage)
Irrigation Amount
(Typically 50% of AW)
Available Water
(AW)
Permanent
Wilting Point
Hygroscopic Water
(essentially no
drainage)
Figure 14. Soil Moisture Holding Capacities
- ET Manager Series 1
- Table of Contents 2
- 1. Introduction 3
- The Weather Reach Water 4
- Management System 4
- Getting to Know your 5
- Rain Bird ET Manager 5
- LCD Contrast 6
- Attention Indicator Light 6
- Specifications 7
- Resource CD Included with 8
- Getting Ready to use 8
- Your ET Manager 8
- Mounting 10
- Wire Connections 11
- 4” insulation off the ends 12
- Wiring Diagrams 13
- Optional Rain Gauge 13
- 2. Installation 14
- Optional External Antenna 15
- Install Battery 16
- 3. Programming 17
- Weather Region 18
- Rain Source 18
- Elevation 18
- Signal Provider Code 18
- 2. Output Method 19
- Output Method 19
- 3. Site Specific Settings 19
- Irrigation Control 19
- Weather Interrupt 23
- System Options 24
- Programming the Sprinkler 25
- Controller 25
- Cycle Start Times 26
- Station Run Times 26
- 4. System Check 27
- Override 28
- Weather Signal Test 28
- Valve Control Test 29
- Water Window Settings 29
- Initial Moisture Levels 29
- 5. Routine Operation 30
- Irrigation Status 31
- 5. Routine Operations 32
- Information Log 33
- Status Messages 34
- Attention Messages 35
- No Paging Signal 37
- Signal Accuracy 38
- No Historical ET Data 39
- Decoder Failure 39
- No Watering Detected 39
- Rain Tip Input Failure 39
- Set Signal Provider Code 40
- Window Overlaps Off Day 40
- 6. Determining 41
- Programmable Settings 41
- Rain Bird 42
- Landscape Conditions 43
- Plant Type 43
- Soil Type 43
- Root Depth 43
- ET Manager Settings 44
- Water Window 45
- Available Days 46
- Advanced Settings 46
- Effective Rain Settings 46
- ET Manager Scheduler 47
- 7. Troubleshooting 48
- Water Management 49
- Troubleshooting 49
- Group are too dry or too wet 50
- 8. Advanced Output Methods 53
- Wiring “A Then B” 54
- ET & Rain Pulse 55
- Wiring ET and Rain Pulse 56
- Using More than One Sprinkler 59
- 9. Appendices 60
- Precipitation Rate 65
- Station Run Time 65
- Master Valve Control 70
- Pump Control 72
- 10. Glossary 73
- The Intelligent Use of Water 80
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