Aquifer Water Extraction Control Using Recharge-Rate Feedback
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Solution Overview
Problem
Conventional water extraction methods from aquifers often lead to over-pumping, causing damage to wells and aquifers due to the lack of knowledge about the recharge rate, resulting in sediment clogging and land subsidence.
Innovation Solution
A water extraction system that includes a well sensor and a communication device connected to a server, which calculates the recharge rate of the well using water level data to adjust the pump rate dynamically, optimizing water extraction and minimizing stress on the aquifer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is pumped from the well at high rate to meet demand, then water supply reliability is improved, but the recharge rate cannot keep up causing water level to drop and well to run dry
Solution Approach 1:
The system continuously monitors the water level in the well using a water level sensor and compares it against the calculated recharge rate. When the water level approaches the recharge level (indicating over-pumping), the system automatically adjusts or shuts off the pump to prevent the well from running dry, thereby maintaining reliable water supply without depleting the aquifer
Solution Approach 2:
The system calculates the specific recharge rate for each individual well based on monitored water level fluctuations and aquifer properties, allowing each well to self-regulate its pumping operations according to its own recharge characteristics without requiring centralized control
2Productivity
If pumping continues until the well runs dry to maximize water extraction, then productivity is improved, but the pump and aquifer are damaged
Solution Approach 1:
The system calculates the recharge rate and determines the recharge level in advance before pumping operations begin. By monitoring water level against this pre-established threshold, the system stops pumping before the well runs dry, preventing damage to the pump and aquifer while still maximizing safe water extraction
Solution Approach 2:
The system maintains a safety margin by continuing to pump only until the water level reaches the calculated recharge level, leaving a cushion above the point where the well would run dry. This prevents catastrophic damage to the pump and aquifer while still allowing near-maximal extraction
3Device complexity
If the recharge rate is not monitored, then device complexity is reduced, but over-pumping occurs causing sediment clogging and land subsidence
Solution Approach 1:
The system replaces complex manual monitoring and calculation methods with automated electronic sensors and computer algorithms. The water level sensor continuously measures the water level, and a computer automatically calculates the recharge rate based on monitored fluctuations, eliminating the need for manual observation and reducing operational complexity
Solution Approach 2:
The system introduces a computer as an intermediary that automatically processes water level data, calculates recharge rates, and determines optimal pumping schedules. This intermediary translates raw sensor data into actionable pumping control decisions, preventing over-pumping and its harmful effects without requiring complex human analysis
Data Source
AI summary
A water extraction system including a water well coupled to an aquifer, a distribution line in communication between the water well and a use element, and a pump coupled to the water well for moving water from the water well to the use element at a pump rate. A well sensor and associated well mote collect water level data and upload the collected water level data to a server. A communication device is coupled to the server and an application carried by one of the server and the communication device calculates the rate of recharge of the well from the collected water level data. A pumping strategy is developed by the application using the recharge rate to determine an altered pump rate.