1. subset of wells are monitored, data available within 1 hour, wireless, network limited without additional sensors (ecoli sensors :Sporian Microsystems ) Costs: each sensor: $9’000 + reactive agent ($100/2-3day) data samples all wells are monitored by manually collecting samples, data results available after 8-18 hrs., network can be expanded (ecoli evaluation system: Veolia Endetec) Costs: system: $15’000 + $10 reactive agent / test

2. public house of data

3. Compensating sensing Replace unavailable sensors with readily available sensors and additional analysis to find the originally intended data. For example, instead of (currently) expensive e-coli sensors one can measure ‘cheaper’ parameters such as localized soil humidity, rainfall (amount and duration) to estimate the probability of an e-coli event. Whatever the actual choice of compensating sensors are, the setup should be devised to allow for inclusion of additional inputs …. (I am working on a similar approach this summer with the GBF system.) public house of data

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