![]() Water and waste come s in from the side, just above the horizontal sieve section. ![]() The sieve conveyor has a horizontal sieve section through which the water passes and where the vegetable waste is gathered. The sieved water is gathered in the pump pit. The project also meets the National Historic Preservation Act/Section 106 Programmatic Agreement, Exclusion #IV.B 9 – Rehabilitation work limited to actions for retaining and preserving, protecting and maintaining, and repairing and replacing in kind materials and features, consistent with the Secretary of Interior's Standards for Rehabilitation and the accompanying guidelines.įor further information about this project, please contact Exhibit Specialist, C&O Canal NHP, 1850 Dual Highway, Suite 100, Hagerstown, MD 21740.In the cull room / waste area the flume water flows into our sieve system in which the waste and the water are separated. It meets categorical exclusion #C.4 – Routine maintenance and repairs to cultural resources sites, structures, utilities, and grounds if the action falls under an approved Historic Structures Preservation Guide or Cyclic Maintenance Guide, or if the action would not adversely affect the cultural resource. The project does not pose any serious or long-term effects to the environmental, historical, cultural, archeological, or visual resources. The park's Interdisciplinary Team reviewed the project for impacts to natural and cultural resources. There is no evidence remaining of the inlet plate. The existing mechanisms that were installed to raise and lower a inlet cover plate will be restored to give the appearance of an operational feature. The concrete flume head and wing wall repairs would not be reversible as they will become structural strength to replace eroded portions of the existing walls. The concrete bulkhead will be totally underwater during normal operations of the canal and therefore not visible to park visitors. This project will repair the heavily scoured and eroded concrete bypass flume wing walls, stabilize the inlet and outlets of the flume pipe with selective grout injection, and prevent water infiltration into the back of the Lock 20 masonry walls by installing a concrete and masonry bulkhead at the flume inlet. Park personnel and visitors are able to access the area above the bypass flume. Lock 20 is a functional lock that is used on a regular basis April-October for an interpretive program using a replica canal boat, which transports park visitors through the lock and along the canal. Today, the bypass flume area is covered with earth, topped with a brick walkway and grass. The exact date of the existing terra cotta bypass pipe is uncertain but it is believed to be a 20th century repair. Water is controlled via a waste weir located nearby. The existing flume at Lock 20 is not functioning as a bypass flume. Most of these bypass flumes were open, but the one at Lock 20 is believed to have been historically covered due to its proximity to the Great Falls Tavern. These structures were parallel to the lock. Locks on the C&O Canal had bypass flumes to divert water during lock operations. These voids affect the structural strength and integrity of Lock 20. These voids had been caused by water leaks within the bypass flume, which is not operational. During the course of preservation repairs to Lock 20 (PEPC # 16962), Great Falls, MD, park staff discovered that significant voids were present behind the north lock wall, within the bypass flume area of Lock 20.
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