my magane says eletronic fault?

i have a megane 1.5 dci o4 and its been raining for a few days and i had a load of water in the driver side floor compartment and then drove to training. got back in after an hour and a half and the ignition came on but would not start stop light came on and then it says electronic fault tryd to bump start it but wouldent tick over. next day took battrie out to reset it but same thing is happning any idea ?.