In addition to filing an annual report, it shall be the duty of the Planning Commission to make, or cause to be made, and to lay before the Township Board of Commissioners maps and plans of the Township, or any portion thereof, showing the streets, highways and other natural and artificial features, and also any locations recommended by it for any new public buildings, civic schemes, parkways, parks, playgrounds, or any other public grounds or public improvements, and any widening, extension, or relocation of the same, and thereafter, from time to time, the Planning Commission may lay before the Township Board of Commissioners any modification, change, or supplement to any prior plan or plans.