Dynamic Variables

Things that change with time 

Dynamic variables can be considered to operate within two levels of a water resource planning time cycle.  Firstly, an annual seasonal cycle of 12 months, this typically includes variables such as:

  • weather patterns (precipitation, ambient temperature, wind)
  • household demand and non household (agricultural, industrial and tourism)
  • infrastructural capacity (borehole pumping, treatment, planned / unplanned maintenance)
Secondly, a management planning cycle of 25 years which typically includes these variables in addition to the annual cycle:
  • climate change (UKCP09)
  • population change (jobs, housing, inflow/outflow, demographics) also including planned development
  • consumer behavioural change (for example, changing attitude to water and energy for sustainable homes and aspirations for improved Per Capita Consumption (PCC))
  • changing patterns of water use of industrial, business and agricultural customers (referred to as non-household water use in the WRMP)
  • changes in assets service level (new & expiring water sources, plant, pipe etc) and  the need to maintain the serviceability of assets as guided by the water regulator
  • energy change (cost & availability)
  • legislative change (statutory requirements, licensing regime)