Are there any encroachment charges/issues from the authorities even after obtaining OC?

Hello Sir, I am planning to buy a 11 year old resale flat of Purva builders in Bangalore. Near the apartment there are two lakes and there are connecting storm water drains passing near the apartment complex. Owner is telling he has got all the clear titles, OC, CC and other documents right. But when I checked for recent survey details for storm water drain (SDM) encroachment, it shows there is a SWD encroachment of 1200 Sq ft in survey number 49 and 51 which are part of the apartment complex. So my query are 1. Will there be any chances of encroachment issues even after obtaining OC for 11 year old apartment complex. 2. If your answer is yes, then how risky is it to buy the flat over here? Below are the web links I have checked for encroachment details. https://www.mapshalli.org/#!/village/19127/survey/49 http://www.rajakaluve.org/?village=19127&survey=43 Detailed maps of individual survey numbers and issues http://164.100.133.91/rajkalve/default.aspx?dir=%5c%5cbhm-db-pp05%5cDistrict%5cMapshared%5cRajkalve%5c%5cBangalore+East\Kaikondrahalii Thanks for your answers in advance.