Underground Water Storage with Anti-Filtration Barriers
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Solution Overview
Problem
Existing methods for underground water storage fail to effectively retain large volumes of rainwater and meltwater, especially in areas lacking natural water sources, as they often result in rapid flow to lower drainage areas and do not prevent siltation within the storage reservoirs.
Innovation Solution
An underground retention pond system is created using a natural water-permeable layer separated by an impermeable anti-filtration barrier, featuring a slot trench filled with water-permeable material and a modular water distribution collector with filtration material, connected to a supply and recovery system, including a recovery well with a pump and control apparatus, and bleeding and venting elements for air exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If water is discharged to natural permeable layers using drain wells, then water can be stored underground, but the water flows rapidly to lower drainage areas and is not retained for long time
Solution Approach 1:
The permeable layer is divided into multiple compartments by impermeable walls, creating separate storage chambers that prevent rapid water flow through the entire layer. Each compartment acts as an independent storage unit, extending water retention time by forcing water to traverse multiple segmented barriers rather than flowing freely to drainage areas.
Solution Approach 2:
An artificial impermeable substratum is introduced as an intermediary barrier between the permeable layer and the natural drainage system. This intermediate layer blocks the direct flow path to lower drainage areas, allowing water to be retained in the permeable layer for extended periods while still maintaining the natural groundwater table level.
2Quantity of substance
If modular underground storage units are used, then water can be accumulated below ground surface, but the system lacks effective filtration and is prone to siltation
Solution Approach 1:
The system employs a permeable layer with controlled porosity that allows water infiltration while filtering out suspended particles and sediments. The porous structure acts as a natural filter, trapping silt and contaminants before they can accumulate in the storage chambers, thus maintaining water quality and preventing reservoir siltation over time.
Solution Approach 2:
Water is pre-filtered by the permeable layer and artificial substratum before entering the storage chambers. This preliminary filtration action removes suspended solids and potential siltation sources before water is stored, eliminating the need for complex post-storage filtration systems and ensuring long-term reservoir reliability.
3Quantity of substance
If impermeable walls are constructed from surface to below impermeable substratum, then water can be retained in the permeable layer, but the system complexity and construction difficulty increase
Solution Approach 1:
The impermeable walls serve multiple functions simultaneously: they define storage chamber boundaries, act as anti-filtration barriers to prevent water loss, provide structural support for the permeable layer, and facilitate compartmentalization for better water management. This multi-functionality reduces the need for additional separate components, simplifying the overall system despite the substantial water retention capacity required.
4Productivity
If water level is maintained higher than surrounding aquifer, then water can be supplied to reservoir from surrounding layer, but pump and valve systems increase operational complexity
Solution Approach 1:
The system maintains the water level in storage chambers at or near the natural groundwater table level, creating equipotential conditions that eliminate the need for energy-consuming pump systems. Water moves freely between the surrounding aquifer and storage chambers through hydraulic equilibrium, achieving efficient water supply without mechanical intervention while maintaining adequate storage capacity.
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
This system efficiently stores and manages water by preventing siltation and maintaining water levels higher than the surrounding aquifer, allowing controlled water supply and recovery, while ensuring air exchange and biological functionality.
Implementation Method 1
filled with a water-permeable material, on which there is a water distribution collector, made of modular boxes with perforated bottoms, filled in the near-bottom part with a filtration material
Implementation Method 2
separated from the water-permeable layer by means of an impermeable anti-filtration barrier, formed from the land surface to a depth below the bottom of the water-permeable layer
Implementation Method 3
in which recovery well there is a recovery pump connected to a recovery pipeline
Implementation Method 4
made of modular boxes with perforated bottoms, having perforations in walls abutting the neighbouring boxes
Data Source
Figure 1
Figure 2
AI summary
An arrangement of devices for underground storage of water and for its recovery, comprising a part of a natural water-permeable layer lying on an impermeable layer, separated by means of at least one closed impermeable anti-filtration barrier with a substantially vertical inclination, formed from the land surface to a depth below the bottom of the water-permeable layer, as well as comprising a supply installation and a water recovery installation.