Bi-directional Subsurface Irrigation System Using Negative Pressure
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Solution Overview
Problem
Current subsurface irrigation systems face challenges such as water loss through gravity, difficulty in maintaining optimal soil moisture levels, ineffective nutrient distribution, and inability to collect excess water for conservation, especially in arid regions, due to limitations in controlling irrigation rates and bi-directional flow capabilities.
Innovation Solution
A bi-directional flow subsurface irrigation system that utilizes detecting probes, bi-directional flow tubes, a water reservoir, and pressure control tanks to automatically adjust moisture levels based on real-time soil moisture needs, preventing water loss through gravity and allowing for the collection of excess water, using negative pressure to manage moisture movement and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If subsurface percolation or drip irrigation is used to push water movement in soils, then irrigation line spacing can be increased, but water is lost through gravity when soil moisture exceeds field capacity
Solution Approach 1:
The patent inverts the conventional approach by using negative pressure (suction) instead of positive pressure (pushing) to move water through soil. The capillary wicks draw water upward and outward from buried reservoirs through capillary action, eliminating gravity-driven water loss while maintaining effective irrigation coverage.
Solution Approach 2:
The system uses capillary pressure (a form of hydraulic principle) to drive water movement through the soil matrix. The capillary wicks create negative pressure zones that pull water from the reservoir through the soil pores, replacing the need for hydraulic pressure that causes gravity-driven percolation losses.
2Loss of energy
If capillary action is used for moisture migration in soil, then water loss through gravity is reduced, but soil moisture content does not reach levels needed by plants
Solution Approach 1:
The system performs preliminary action by pre-filling underground reservoirs with water before plant consumption occurs. The reservoirs act as subsurface water sources that continuously supply moisture through capillary wicks, ensuring adequate soil moisture content is maintained without excess that would cause gravity-driven loss.
Solution Approach 2:
The capillary wicks serve as intermediaries between the underground water reservoirs and the soil root zone. These wicks transport water through capillary action, delivering the precise amount of moisture needed to plants while preventing both water deficit and excess that would lead to gravitational percolation.
3Quantity of substance
If pressure is applied to supply water from perforated conduits, then water can be delivered to soils, but soil pores become saturated and water is lost by gravity
Solution Approach 1:
The patent replaces pressure-driven water delivery (positive pressure) with suction-driven delivery (negative pressure) using capillary action. Water is pulled through the soil matrix by capillary forces rather than pushed by hydraulic pressure, preventing pore saturation and gravity-driven percolation losses while maintaining effective water delivery to the root zone.
4Loss of energy
If conventional subsurface irrigation methods are used, then water conservation is improved compared to surface irrigation, but real-time control of irrigation rates to match plant consumption rates is difficult
Solution Approach 1:
The system incorporates soil moisture sensors that continuously monitor soil moisture content and provide feedback to the control system. This feedback mechanism enables automatic adjustment of irrigation rates to match real-time plant water consumption, optimizing water conservation while responding dynamically to changing soil and plant conditions.
Solution Approach 2:
The capillary wick system provides self-regulating water delivery where the capillary action automatically adjusts water flow based on soil moisture demand. When soil moisture is low, capillary forces draw more water from the reservoir; when moisture is sufficient, flow naturally decreases, eliminating the need for complex external control mechanisms.
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 achieves nearly zero water loss by maintaining optimal soil moisture levels and allowing for the collection of excess water, enhancing water conservation and plant growth, particularly in arid regions, while being suitable for both terrestrial and space-based agricultural applications.
Implementation Method 1
water movement in soils... hydraulic pressures in soil pores shall be sufficient enough to push the moisture migration in soils... moisture can be migrated in soil by capillary action
Implementation Method 2
detecting probes... to automatically provide suitable moisture contents for vegetations to grow
Implementation Method 3
pressure control tanks to automatically adjust moisture levels based on real-time soil moisture needs, preventing water loss through gravity
Implementation Method 4
Water can be wasted during and after irrigation by the following three pathways: evaporation, surface runoff, and percolation
Data Source
AI summary
A soil moisture auto control system which can be used in subsurface irrigation, outer space agricultural farm irrigation, semi-arid and arid agricultural areas irrigation and nutrients addition, as well as auto watering and nutrients addition devices for flower and/or vegetable pots in indoor planting, by an external negative pressure design system responding to soil moisture needs by plants in the agricultural areas by bi-directional flows arrangements to automatically adjust moisture needs for plants.