Subsurface Irrigation Field Drying Through Reversible Emitters
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Solution Overview
Problem
Subsurface irrigation systems face challenges in effectively aerating and drying soils during high precipitation or localized flooding, leading to wet spots and delayed crop planting or harvesting due to excess water retention.
Innovation Solution
A subsurface irrigation system that integrates gas emission through emitters in driplines to aerate and dry soils by introducing pressurized gas, allowing excess water to enter the system, and using a pressure regulator or T-valve to manage gas pressure for efficient aeration and water removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subsurface irrigation systems are used for micro-irrigation, then water is applied efficiently to the root zone, but excess water accumulates in the soil during high precipitation or flooding events
Solution Approach 1:
The subsurface irrigation system is designed to perform multiple functions: delivering water to plants during irrigation and removing excess water during saturation events. The same emitters and tubing infrastructure are used for both water application and water extraction, making the system universal and eliminating the need for separate drainage infrastructure.
Solution Approach 2:
Instead of using the irrigation system only to add water to the soil, the system is inverted to also function in reverse by extracting water from the soil. The emitters that normally deliver water are used to admit and remove excess water from the root zone, effectively reversing the normal water flow direction through the system.
2Quantity of substance
If water is allowed to accumulate in subsurface soil during saturation, then soil moisture is maintained, but soil aeration is reduced and crop planting or harvesting is delayed
Solution Approach 1:
The system operates in periodic cycles, alternating between irrigation mode and drying mode. During saturation events, the system switches to drying mode where emitters admit water from the soil and pressurized gas is applied to accelerate water removal. This periodic switching allows the system to respond dynamically to soil moisture conditions and restore aeration capacity.
Solution Approach 2:
Pressurized gas is introduced as an intermediary substance to facilitate water removal from the soil. The gas applies pressure to force excess water out of the soil matrix and through the emitter system, accelerating the drying process without requiring mechanical disturbance of the soil.
3Reliability
If pressurized gas is introduced to aerate soil and remove water, then soil aeration is improved and water is expelled, but system complexity increases with additional components
Solution Approach 1:
The gas introduction system is merged with the existing irrigation infrastructure. The same mainline and tubing network that delivers water is used to deliver pressurized gas to the emitters. This combining of functions reduces the need for separate gas delivery infrastructure and minimizes additional system complexity.
Solution Approach 2:
The irrigation system components, particularly the emitters and tubing, are designed to handle both liquid water and gaseous substances. This multi-functionality allows the same hardware to serve dual purposes: water irrigation and gas-powered soil aeration/drying, reducing the need for additional specialized components.
4Productivity
If emitters are used to deliver water to root zone, then plant growth is supported, but the same emitters can be used to admit water from soil during drying operations
Solution Approach 1:
The emitter function is inverted from unidirectional water delivery to bidirectional operation. During irrigation, emitters deliver water from the tubing into the soil. During drying operations, the same emitters admit water from the soil into the tubing to be removed. This reversible functionality maximizes the utility of existing emitter infrastructure.
Solution Approach 2:
The emitters are designed as multi-functional components that can operate in reverse. The same emitter that delivers water during irrigation can admit water during drying operations, providing versatility and eliminating the need for separate components for irrigation and drainage functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively dries wet soils, reduces nutrient leaching, enhances soil dynamics, and accelerates crop readiness by actively or passively removing water, while utilizing beneficial gases like CO2 for improved crop growth and yield.
Implementation Method 1
The system is connected to a pressurized gas source such as a positive displacement air blower, pump, compressor, tank, or other pressurized source. Pressurized gas is introduced into a zone of the system to aerate subsurface soil by expelling gas through emitters
Implementation Method 2
Water reaches the root zone by being injected through the driplines containing the emitters. The emitters deliver water directly to the root zone of plants via capillary action in the soil
Implementation Method 3
The flush valve may then be closed when the system is used for irrigation. A flush valve of the passive system may be left open to allow excess water to escape the system under the influence of gravity
Data Source
AI summary
A subsurface irrigation system dries subsurface soil with a tube that is structured to emit water to subsurface soil. The tube has a plurality of emitters that are spaced apart at fixed intervals along the tube and disposed through a wall of the tube. The tube receives water from subsurface soil through the plurality of emitters. The water discharges through a flush pipe of the subsurface irrigation system. The subsurface soil dries passively as water discharges through the flush pipe when a flush valve connected to the flush pipe is open. A vacuum installed on the flush valve may hasten removal of water from subsurface soil. Subsurface soil dries actively as air is introduced into the subsurface soil through the plurality of emitters when the flush valve is open. The subsurface soil is irrigated when water emits through the plurality of emitters when the flush valve is closed.