Alum Creek Lake is a man-made reservoir located in Delaware County, Ohio, United States. It was built in 1974, covers 5 square miles (13 km2), and has a maximum capacity of 134,815 acre-feet (166,292,000 m3).
Alum Creek Lake
Alum Creek Dam and Lake. View is to the northwest.
When the dam was constructed in 1974 it was out in the country. Today, modern homes reach nearly to the base of the dam. View from the top of the dam looking south.
Alum Creek Dam was constructed between 1970 and 1974 on Alum Creek, a tributary of Big Walnut Creek, which drains into the Scioto River. The dam is a rolled earth-fill embankment 10,000 ft (3,000 m) in length with a maximum height of 93 ft (28 m). The spillway is located high on the right abutment with the raceway dropping off in front of it to the stilling basin below. Control is provided by three 34 ft (10 m) by 25 ft (7.6 m) tainter gates supported by 8 ft (2.4 m) wide concrete piers resting on concrete ogee sections. The ogee sections have a crest elevation of 878 feet (268 m) and are founded at 839 feet (256 m) elevation.
Alum Creek Dam spillway. Water is normally discharged through the hole in the far wall. Three large gates can be opened to provide emergency control under high water conditions. The retrofit cables were installed in the large flat calming section at the base of the dam.The Alum Creek Dam spillway is perched high on the abutment; this prompted concerns within the Army Corps of Engineers about deep-seated sliding.
Potential dam failure and retrofit (1975–1978)
On April 24, 1975, during a periodic inspection of the completed dam, the US Army Corps of Engineers expressed concern about the safety of the spillway monoliths. The rock underlying the dam is Ohio Black Shale which is a largely hard, massive silt shale. It is highly fractured below the base of weathering. Within this shale are several light gray, silty to clayey shale seams up to 1 ft (0.30 m) thick. It may be possible that the spillwaymonolith and its underlying bedrock could slide forward on one of these seams, opening a gap between the monolith and the rolled earth dam leading to rapid and catastrophic erosion of the dam.
Testing
Twelve, 6 inches (150 mm) diameter core holes were drilled in the raceway directly in front of the ogeeweirs. At least six of these cores exhibited a clayey seam about elevation 830 (nine feet below the ogee foundations). Testing of this material and deep-seated sliding analysis indicated that the dam did indeed face a safety issue.[citation needed]
Retrofitting
To prevent the concrete monolith from sliding forward, it was decided to install seven cable anchors deep into the bedrock. Each anchor consisted of bundled, high strength steel cables that were concreted into the bottom of the holes. They were then hydraulically tensioned and the holes filled with grout. Anchors were installed at a 45 degree angle to a depth of 813, or 26 feet (7.9 m) below the foundation of the ogees. On March 2, 1977, the project was bid to VSL Corporation for $254,777. Drilling for the anchors began on June 7, 1977. The final loading on each anchor was 1300 kips. On September 28, 1977, one of the anchor's foundations failed and had to be re-concreted. By 1978, the project was completed.[citation needed]
On January 16, 2005 Alum Creek Dam's reservoir reached its highest level since construction was completed in 1974, an elevation of 898.94, about 17 feet (5.2 m) above normal level. At this level control was maintained through the discharge pipe and it was not necessary to open the three main spillway gates.
This extreme event was caused by an average of 5–8 inches (130–200 mm) of rain falling over Central Indiana and Ohio during January 4–14, 2005. This rain combined with snow melt and saturated ground to produce record breaking runoff. Other reservoirs also set pool level records, including Deer Creek, Delaware Lake, Paint Creek, Atwood Lake, Bolivar Dam, Charles Mill Lake, Dillon Lake, Dover Dam, Mohawk Dam and Wills Creek.
Recreation
Alum Creek Lake is popular with locals and regional tourists alike with its fishing, picnicking, boating, disc golf course, kitesurfing and hiking opportunities.
References
Barnes, William D., Anchoring of Spillway Monoliths, Alum Creek Lake, Ohio, Concrete Structures Repair and Rehabilitation, Vol C-82-1, September, 1982, US Army Engineer Waterways Experiment Station, Vicksburg, MS.
External links
Alum Creek Lake current level graph
Alum Creek State Park website
Ohio DNR fishing map of Alum Creek Lake
August 17, 2023
alum, creek, lake, made, reservoir, located, delaware, county, ohio, united, states, built, 1974, covers, square, miles, maximum, capacity, acre, feet, alum, creek, lake, view, northwest, locationdelaware, county, ohiocoordinates40, 185718, 966636, 185718, 966. Alum Creek Lake is a man made reservoir located in Delaware County Ohio United States It was built in 1974 covers 5 square miles 13 km2 and has a maximum capacity of 134 815 acre feet 166 292 000 m3 Alum Creek LakeAlum Creek Dam and Lake View is to the northwest Alum Creek LakeLocationDelaware County OhioCoordinates40 11 09 N 82 58 00 W 40 185718 N 82 966636 W 40 185718 82 966636TypeimpoundPrimary inflowsAlum CreekPrimary outflowsAlum CreekBasin countriesUnited StatesBuiltSeptember 1974 1974 09 Surface area5 sq mi 13 km2 Max depth68 ft 21 m Water volume134 815 acre ft 166 292 000 m3 When the dam was constructed in 1974 it was out in the country Today modern homes reach nearly to the base of the dam View from the top of the dam looking south Contents 1 Dam construction 1970 1974 2 Potential dam failure and retrofit 1975 1978 3 Testing 4 Retrofitting 5 January 2005 Flood 6 Recreation 7 References 8 External linksDam construction 1970 1974 EditAlum Creek Dam was constructed between 1970 and 1974 on Alum Creek a tributary of Big Walnut Creek which drains into the Scioto River The dam is a rolled earth fill embankment 10 000 ft 3 000 m in length with a maximum height of 93 ft 28 m The spillway is located high on the right abutment with the raceway dropping off in front of it to the stilling basin below Control is provided by three 34 ft 10 m by 25 ft 7 6 m tainter gates supported by 8 ft 2 4 m wide concrete piers resting on concrete ogee sections The ogee sections have a crest elevation of 878 feet 268 m and are founded at 839 feet 256 m elevation Alum Creek Dam spillway Water is normally discharged through the hole in the far wall Three large gates can be opened to provide emergency control under high water conditions The retrofit cables were installed in the large flat calming section at the base of the dam The Alum Creek Dam spillway is perched high on the abutment this prompted concerns within the Army Corps of Engineers about deep seated sliding Potential dam failure and retrofit 1975 1978 EditOn April 24 1975 during a periodic inspection of the completed dam the US Army Corps of Engineers expressed concern about the safety of the spillway monoliths The rock underlying the dam is Ohio Black Shale which is a largely hard massive silt shale It is highly fractured below the base of weathering Within this shale are several light gray silty to clayey shale seams up to 1 ft 0 30 m thick It may be possible that the spillway monolith and its underlying bedrock could slide forward on one of these seams opening a gap between the monolith and the rolled earth dam leading to rapid and catastrophic erosion of the dam Testing EditTwelve 6 inches 150 mm diameter core holes were drilled in the raceway directly in front of the ogee weirs At least six of these cores exhibited a clayey seam about elevation 830 nine feet below the ogee foundations Testing of this material and deep seated sliding analysis indicated that the dam did indeed face a safety issue citation needed Retrofitting EditTo prevent the concrete monolith from sliding forward it was decided to install seven cable anchors deep into the bedrock Each anchor consisted of bundled high strength steel cables that were concreted into the bottom of the holes They were then hydraulically tensioned and the holes filled with grout Anchors were installed at a 45 degree angle to a depth of 813 or 26 feet 7 9 m below the foundation of the ogees On March 2 1977 the project was bid to VSL Corporation for 254 777 Drilling for the anchors began on June 7 1977 The final loading on each anchor was 1300 kips On September 28 1977 one of the anchor s foundations failed and had to be re concreted By 1978 the project was completed citation needed January 2005 Flood EditThis section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed January 2020 Learn how and when to remove this template message On January 16 2005 Alum Creek Dam s reservoir reached its highest level since construction was completed in 1974 an elevation of 898 94 about 17 feet 5 2 m above normal level At this level control was maintained through the discharge pipe and it was not necessary to open the three main spillway gates This extreme event was caused by an average of 5 8 inches 130 200 mm of rain falling over Central Indiana and Ohio during January 4 14 2005 This rain combined with snow melt and saturated ground to produce record breaking runoff Other reservoirs also set pool level records including Deer Creek Delaware Lake Paint Creek Atwood Lake Bolivar Dam Charles Mill Lake Dillon Lake Dover Dam Mohawk Dam and Wills Creek Recreation EditAlum Creek Lake is popular with locals and regional tourists alike with its fishing picnicking boating disc golf course kitesurfing and hiking opportunities References EditUS Army Corps of Engineers Alum Creek Retrofit Case History 1985 Barnes William D Anchoring of Spillway Monoliths Alum Creek Lake Ohio Concrete Structures Repair and Rehabilitation Vol C 82 1 September 1982 US Army Engineer Waterways Experiment Station Vicksburg MS External links EditAlum Creek Lake current level graph Alum Creek State Park website Alum Creek Dam Under Construction Photo 1 Alum Creek Dam Under Construction Photo 2 Ohio DNR fishing map of Alum Creek Lake Retrieved from https en wikipedia org w index php title Alum Creek Lake amp oldid 1078894091, wikipedia, wiki, book, books, library,
