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The gas sensor data is given to the input of the proposed system. The proposed system provides 1 for 3 consequent ones and .5 for 2 consequent ones and .25 for one. The Table 3.1 below shows the structure of the Tristate pattern.

Table 3.1 Tristate pattern.

Patterns	Score
Consequent 3 ones	3
Consequent 2 ones	2
Single one	1

Finally, the sum of the values has been calculated using the formula below:

Where C,H,M denotes Carbon Monoxide, Hydrogen sulphide and Methane sensor datas and n,m, p denotes the range of the datas.

All these major components are connected in the arduino board with connecting wires and fitted in the required places (underground drainage pipes) where damaged occurred. It will easily detect the gases and also the leakage of pipes in that specific area. It also gives a notification to the authorities about the leakage by a message and it is able to identify the location by GSM module and fix the problem as soon as possible.