Karnataka High Court: A PIL challenges a notification reducing buffer zones around Bengaluru's stormwater drains and lakes. Petitioners warn of flood risks, environmental damage and legalisation of encroachments, seeking restoration of earlier norms. Bengaluru: The High Court of Karnataka on Tuesday issued notices to the authorities in a public interest litigation (PIL) challenging an official notification that redefines buffer zones for lakes and stormwater drains in Bengaluru..