In each chamber 11 laterals of 41 square feet cross-section will be led from the side wall culverts while at the middle culvert there will be 10 laterals having a minimum cross-section of 33 square feet. Each lateral will have five holes, each of 12 square feet area, opening up through the lock floor. The laterals leading from the middle wall culvert are to be controlled individually to provide for independent operation of the twin chambers. The lake levels and the desired lock levels are to be maintained by large steel miter gates. At the upper and lower end of the upper chambers of all locks there will be two sets of these gates operated simultaneously so that a vessel entering the upper chamber will always have two pairs of gates between it and the lake. At the lower end of each flight, besides the regular gates there will be guard gates mitering in the opposite direction. They are intended primarily for holding back the water in the canal below, when the lock above is unwatered for repairs but may be operated during lockages purely as a safeguard. As a protection to the gates heavy fender chains are to be stretched across the locks at critical places. They are designed by suitable retarding devices to bring a slowly moving vessel to rest before it can strike the gate. While the gates below are being opened the chains drop into recesses in the walls and across the floor. Near the upper end of the locks and 200 feet above the uppermost gate, an emergency dam of the swing bridge type will be provided to be used in case of accident to the upper gates. The following precautions against accident are to be observed: First. All vessels must stop some distance from the gates. Second. The lock operators here take the vessel in charge and control its passage through the locks. Third. If a vessel breaks away from the operators or fails to stop at the proper place, it comes against the heavy chains stretched across the locks and is either brought to a full stop or is greatly retarded. Fourth. In case a chain breaks, the vessel has two sets of gates to break, if at the upper level, where an accident would be most serious. Should all these barriers fail the emergency dam can be swung into place in a very short time.