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Pinery Dam Outlet Conduit Repair
The Pinery Dam (a.k.a. Bingham Lake Dam), located near Parker, Colorado, is a zoned embankment dam, over 50 feet (15.24 meters) high, constructed in the early 1970's. The Class 2 dam has a 350-foot (106.68-meter) long, 18-inch (45.7-cm) diameter, RCP (reinforced concrete pipe) outlet conduit with a reinforced concrete cradle. Leakage flows coming out of the existing outlet conduit were continuous and measured over 60 gpm (gallons per minute) (227 lpm (liters per minute)) with small amounts of embankment material. The source of the leakage problem became apparent when a remote-controlled video camera was able to view a 3-inch (7.6-cm) vertical offset at a pipe joint about 260 feet (79.25 meters) from the downstream end of the outlet conduit. Since draining the reservoir was to be avoided, any repair solution had to be performed either underwater on the upstream side or entirely from the downstream end of the outlet conduit. In 2002, a failed repair attempt was made using an inflated flexible-tube type lining set in place with epoxy resin from the downstream end. During this repair installation, the leakage flows and pressures caused the flexible-tube lining to be forced back out from the outlet conduit, ending in the repair failure. Several other repair alternatives were considered, but the final repair using a HDPE (high density polyethylene pipe) slip lining with grouting was selected. The HDPE slip lining solution was the least expensive alternative, but was risky, because of the leakage flows and the 260-foot (79.25-meter) distance to the 3-inch (7.6-cm) vertical offset in the 18-inch (45.7-cm) RCP. This selected repair solution required the use of an inflatable packer, remote-controlled video camera, and 12, 1-inch (2.54-cm) diameter grout lines at up to 300 feet (91.4 meters) long. In the annular space between the 14-inch (35.56-cm) HDPE and 18-inch (45.7cm) RCP, 12 individual grout cells were filled with non-shrink cementitious grout along the entire slip lining length. After the successful HDPE slip lining installation in 2003, the measured leakage flow was reduced to about 4.8 gpm (18.17 lpm) from the repaired outlet conduit.
Pinery Dam Outlet Conduit Repair
The Pinery Dam (a.k.a. Bingham Lake Dam), located near Parker, Colorado, is a zoned embankment dam, over 50 feet (15.24 meters) high, constructed in the early 1970's. The Class 2 dam has a 350-foot (106.68-meter) long, 18-inch (45.7-cm) diameter, RCP (reinforced concrete pipe) outlet conduit with a reinforced concrete cradle. Leakage flows coming out of the existing outlet conduit were continuous and measured over 60 gpm (gallons per minute) (227 lpm (liters per minute)) with small amounts of embankment material. The source of the leakage problem became apparent when a remote-controlled video camera was able to view a 3-inch (7.6-cm) vertical offset at a pipe joint about 260 feet (79.25 meters) from the downstream end of the outlet conduit. Since draining the reservoir was to be avoided, any repair solution had to be performed either underwater on the upstream side or entirely from the downstream end of the outlet conduit. In 2002, a failed repair attempt was made using an inflated flexible-tube type lining set in place with epoxy resin from the downstream end. During this repair installation, the leakage flows and pressures caused the flexible-tube lining to be forced back out from the outlet conduit, ending in the repair failure. Several other repair alternatives were considered, but the final repair using a HDPE (high density polyethylene pipe) slip lining with grouting was selected. The HDPE slip lining solution was the least expensive alternative, but was risky, because of the leakage flows and the 260-foot (79.25-meter) distance to the 3-inch (7.6-cm) vertical offset in the 18-inch (45.7-cm) RCP. This selected repair solution required the use of an inflatable packer, remote-controlled video camera, and 12, 1-inch (2.54-cm) diameter grout lines at up to 300 feet (91.4 meters) long. In the annular space between the 14-inch (35.56-cm) HDPE and 18-inch (45.7cm) RCP, 12 individual grout cells were filled with non-shrink cementitious grout along the entire slip lining length. After the successful HDPE slip lining installation in 2003, the measured leakage flow was reduced to about 4.8 gpm (18.17 lpm) from the repaired outlet conduit.
Pinery Dam Outlet Conduit Repair
Cesare, Joseph A. (author) / Brauer, Daniel J. (author)
Biennial Geotechnical Symposium 2004 ; 2004 ; Denver, Colorado, United States
H2GEO ; 186-198
2004-10-08
Conference paper
Electronic Resource
English
Pinery Dam Outlet Conduit Repair
| British Library Conference Proceedings | 2005
Distribution of head at rectangular conduit outlet
| Engineering Index Backfile | 1966