Harvard University planned to locate a new science complex above a Massachusetts Water Resources Authority (MWRA) brick masonry pipeline that was over 115 years old. The University was concerned about the impact of construction on the 69 in. high...
The Sonoma County Water Agency manages a regional water supply to ensure its customers have access to clean water. Wanting to preserve their assets, the agency needed to understand the condition of their aging transmission system pipelines to...
With limited guidance in existing design standards, the culvert manufacturer was struggling to efficiently design headwalls for their metal culverts skewed relative to the road. SGH implemented a design procedure allowing them to quickly analyze...
Constructed in the 1870s, the Beacon Street Line carries water under the MBTA Green Line tracks in the busy Brookline neighborhood. Massachusetts Water Resources Authority (MWRA) identified a leak in the 48-in. dia. cast iron pipe below the train...
In 2014, a five-story residence was constructed directly over DC Water’s North East Boundary Trunk Sewer (NEBTS) with only about 2 ft of soil between the bottom of the basement and the top of the 22-ft dia. masonry sewer. DC Water...
The Indian Valley Reservoir provides long-term irrigation storage and flood control. A 2010 inspection report recommended seismic analyses of the floodgates and control structure to confirm the gates could be raised following a earthquake. SGH...
During construction of the ITC Crossing development, sections of corrugated metal pipe (CMP) and reinforced concrete pipe (RCP) in the storm drainage system were found to be structurally distressed and damaged. SGH investigated the extent and...
Brandon Shores Power Plant (BSPP) has a proactive inspection and repair program for circulating water and service water pipelines, including prestressed concrete cylinder pipe (PCCP), steel pipe, ductile iron pipe, and others with diameters...
After constructing the first 1.5 mi of the Stroube Drain cast-in-place, reinforced concrete box culvert, the owner discovered the design did not consider live loads for the most severe traffic orientation. The owner wanted to know if cracking...
In 2010, Miami-Dade Water and Sewer Authority (MDWSA) instituted a continuous inspection and repair program for their 48 in. to 96 in. dia. prestressed concrete cylinder pipes (PCCP). With brief periods to perform repairs and field conditions (e....
CFRP pipe lining has proven to be a valuable piping repair technology. Compared to conventional excavation-type repairs, it requires less excavation and disruption to above-ground operations, as well as shorter time out of service. However,...
There is a significant amount of AWWA C303 bar-wrapped pipe (BWP) and C200 steel pipe water transmission mains installed across the United States. While condition assessment of aging BWP lines has typically not received as much attention as some...
Washington Suburban Sanitary Commission (WSSC) has been using carbon fiber reinforced polymer (CFRP) liners for repair of prestressed concrete cylinder pipe (PCCP) since mid-2000s. As part of its repair program, WSSC also performs investigations...
The joint transmission main (JTM) is part of the 38 mile long Joint Regional Water Supply System, operated and maintained by the South Coast Water District in California. The pipeline, made of 60 in. diameter PCCP manufactured in early 1960s,...
By: Murat Engindeniz, Kyle Sanderson, Anthony Samarripas, Aliza Caraballo
The North Texas Municipal Water District (NTMWD) is considering making improvements to the transmission system and pumping scenarios to provide redundancy to their Wylie-Rockwall-Farmersville (WRF) Pump Station, and the planned pumping...
Washington Suburban Sanitary Commission (WSSC)’s condition assessment and repair program on critical transmission mains continued in spring 2016 with a record-breaking project where a total of forty-one 60 in. to 66 in. diameter prestressed...
This webinar addressed the issue that transient activity within water pipelines causes wire breaks in pre-stressed concrete cylinder pipelines (PCCP). The webinar also discussed how the cause of the transients can be determined and how, by...
This paper presents Santa Clara Valley Water District's (SCVWD) approach to addressing their first high profile water main failure including their application of failure investigation, emergency condition assessment, pipe...
The North Texas Municipal Water District (NTMWD) is a water conservation and reclamation district created by an act of the Texas Legislature in 1951. Today NTMWD’s Regional Water System provides drinking water to over 1.6...
This paper presents the recent enhancements to Tarrant Regional Water District’s (TRWD’s) geographic information system (GIS)-based structural evaluation tool, how this tool is used to improve asset management capabilities,