First ascertain that the water body and the forest exist in the government records by moving an applicaion for the copy of the records under the Information Act to the respective Public information officer. Under the said application also get the details of the person to whom the complaint should be lodged. Then lodge a complaint against the said developer, the names of the person who are assisiting the developer to the respective officer as stated under the information furnished to you. Get an acknowledgement in the copy of the complaint you are giving from the concerned department. In case no action is taken within a week of the receipt of the compaint, move the High court within your jurisdiction and file a writ. Your sincere step will definelty be resolved by approprite directions by the High court.