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Hydrogeology Week 4 - Coggle Diagram

- - - - CRT
        
        Constant rate test
        
        pumping at fixed rate for 72hrs
        
        observes drawdown and recovery responses
      - step tests
        
        each step= increasing discharge rates
        
        minimum of 4 steps each lasting 60-120mins
    - - primary metrics
        
        pumping rate
        
        measured using flow meters or manual calculations
        
        drawdown
        
        monitoring at regular intervals using dip meters, pressure gauges and automated loggers
      - higher frequency recording intervals at the beginning to observe rapid early changes, gradual reduction as system stabilises
    - - begin at lowest rate, gradually increase discharge, maintain consistency for comparison
        
        data analysis
        
        plot drawdown vs time to determine efficiency and system response
        
        use semi log scales for better visualisation of data across time scales
    - - flow meters, pressure guages and weirs/baffle boxes
    - - field variability
        
        unexpected geological variability
      - energy costs are directly tied in with lift required for water extraction...minimizing drawdown reduces energy demands
  - - - high efficiency minimises system failures and operational costs
- - - - graphical curve-matching solution
        
        drawdown vs time on log-log graph
        
        superimpose on theis type curve
        
        Scales must be consistent
      - data
        
        Q=Pumping rate
        
        r = distance to observation well
        
        Delta s = drawdown in obs well