Jamieson, Stephen L., France, John W. and Perri, Peter P. CM/GC construction <strong>of</strong> Guanella <strong>Dam</strong>.<strong>Journal</strong> <strong>of</strong> <strong>Dam</strong> <strong>Safety</strong> - Summer 2004 (V. 2 N. 3)Paper describes <strong>the</strong> fast-track design, permitt<strong>in</strong>g, and construction approach that was utilized to developa new water supply reservoir for <strong>the</strong> City <strong>of</strong> Golden, Colorado. The fast-track approach resulted <strong>in</strong> <strong>the</strong>completion <strong>of</strong> <strong>the</strong> entire project <strong>in</strong> a little more than one year, which was two years ahead <strong>of</strong> schedule.Innovative approaches and <strong>the</strong> cooperation <strong>of</strong> <strong>the</strong> SEO, contractor, eng<strong>in</strong>eer, and owner were requiredbecause <strong>of</strong> <strong>the</strong> ongo<strong>in</strong>g drought <strong>in</strong> Colorado, which essentially shut down Golden's water supply at itsmost severe period dur<strong>in</strong>g <strong>the</strong> late summer <strong>of</strong> 2002. Guanella <strong>Dam</strong> is a high hazard potential, <strong>of</strong>fchannel,zoned-embankment dam with a maximum vertical height <strong>of</strong> 34'.Geographic <strong>in</strong>terest: ColoradoSubject terms: design, construction, permits, geotechnical <strong>in</strong>vestigations, seepage control, case studies,embankment damsSchultz, Mark. <strong>Dam</strong> performance dur<strong>in</strong>g <strong>the</strong> San Simeon earthquake. <strong>Journal</strong> <strong>of</strong> <strong>Dam</strong> <strong>Safety</strong> -Summer 2004 (V. 2 N. 3)On December 22, 2003, a M6.5 earthquake occurred near California's central coast, seven milesnor<strong>the</strong>ast <strong>of</strong> San Simeon. This was <strong>the</strong> largest earthquake <strong>in</strong> California s<strong>in</strong>ce <strong>the</strong> 1999 M7.1 Hector M<strong>in</strong>eearthquake. Only four o<strong>the</strong>r earthquakes, s<strong>in</strong>ce 1906, caused more expensive damage. Shak<strong>in</strong>g was feltup and down <strong>the</strong> California coast, from <strong>the</strong> Bay Area to Los Angeles, with cont<strong>in</strong>u<strong>in</strong>g moderateaftershocks as large as M4.9. <strong>Dam</strong>s, roads, bridges, and o<strong>the</strong>r modern <strong>in</strong>frastructure generallyperformed very well <strong>in</strong> this seismic event. The majority <strong>of</strong> damage occurred <strong>in</strong> Paso Robles, where 40build<strong>in</strong>gs collapsed, or were severely damaged, and two fatalities tragically resulted. Federal, state, andlocal disasters were declared. Approximately 1,500 homes suffered m<strong>in</strong>or damage, and approximately500 homes and bus<strong>in</strong>esses were seriously damaged. About 60,000 homes lost power. Twelve stateregulateddams, one Army Corps <strong>of</strong> Eng<strong>in</strong>eers (ACOE) dam, and seven small military dams experiencedstrong shak<strong>in</strong>g with an estimated peak ground acceleration greater than 0.10g. Paper summarizes damperformance and damages to various structures.Geographic <strong>in</strong>terest: CaliforniaSubject terms: earthquakes, seismic analysis, seismic behaviorJohnson, Brian S. Performance-based design <strong>of</strong> an urban spillway. <strong>Journal</strong> <strong>of</strong> <strong>Dam</strong> <strong>Safety</strong> - Fall2004 (V. 2 N. 4)The Standley Lake <strong>Dam</strong> Improvement Project began <strong>in</strong> 1999 to help ensure that <strong>the</strong> dam successfullytransitions to address <strong>the</strong> changes that have occurred over its 96 years <strong>of</strong> operation. A significantembankment raise <strong>in</strong> 1965, suburban development, advances <strong>in</strong> dam eng<strong>in</strong>eer<strong>in</strong>g technology, and<strong>in</strong>creased local, state, and federal regulations have all contributed to <strong>the</strong> challenges <strong>of</strong> ma<strong>in</strong>ta<strong>in</strong><strong>in</strong>g <strong>the</strong>facility as a critical regional resource for ano<strong>the</strong>r 50 to 100 years. This paper describes <strong>the</strong> project, whichwas completed <strong>in</strong> October 2004.Geographic <strong>in</strong>terest: ColoradoSubject terms: spillways, design, spillway capacity, hydrology, design flood, developmentSchellhammer, Chris, Roberts, Thomas I. and McClellan, Phillip. Prepar<strong>in</strong>g EAPs for <strong>the</strong> 21stCentury: How <strong>Dam</strong> Owners are rais<strong>in</strong>g <strong>the</strong> bar for EAPs by <strong>in</strong>stitut<strong>in</strong>g technological growth.<strong>Journal</strong> <strong>of</strong> <strong>Dam</strong> <strong>Safety</strong> - Fall 2004 (V. 2 N. 4)
Eng<strong>in</strong>eer<strong>in</strong>g practices and regulatory enforcement <strong>in</strong> <strong>the</strong> dam safety arena have significantly evolved over<strong>the</strong> last 25 years. The methods, technologies, and capabilities for design<strong>in</strong>g and monitor<strong>in</strong>g dams are farahead <strong>of</strong> where <strong>the</strong>y were 25 years ago. With <strong>in</strong>novative technologies, dam owners can now utilizecomputers for real time monitor<strong>in</strong>g <strong>of</strong> <strong>the</strong>ir dams. These technological systems can also be used as aresource for Emergency Action Plans (EAPs). However, it can be argued that <strong>the</strong>se technologicaladvances are underutilized. For example, <strong>in</strong> Virg<strong>in</strong>ia less than 10 percent <strong>of</strong> dams are equipped withmonitor<strong>in</strong>g electronics.Geographic <strong>in</strong>terest: Virg<strong>in</strong>ia, U.S.Subject terms: EAPs, emergency management, monitor<strong>in</strong>g, <strong>in</strong>strumentationToml<strong>in</strong>son, Ed, Jarrett, Robert D. , Parzybok, Tye and Trieste, Doug. Reanalysis <strong>of</strong> a ColoradoExtreme Ra<strong>in</strong>storm Us<strong>in</strong>g GIS, Pale<strong>of</strong>lood, and Ra<strong>in</strong>fall-Run<strong>of</strong>f Analyses. <strong>Journal</strong> <strong>of</strong> <strong>Dam</strong> <strong>Safety</strong> -Fall 2004 (V. 2 N. 4)Probable Maximum Precipitation (PMP) studies are based primarily on analyses <strong>of</strong> extreme ra<strong>in</strong>stormswhere <strong>the</strong> largest historic ra<strong>in</strong>fall observations are used to determ<strong>in</strong>e PMP values for <strong>the</strong> surround<strong>in</strong>gregions. The October 4-6, 1911, ra<strong>in</strong>storm over <strong>the</strong> southwestern US produced large ra<strong>in</strong>fall amountsand significant flood<strong>in</strong>g <strong>in</strong> Colorado. The daily ra<strong>in</strong>fall observation <strong>of</strong> 8.05 <strong>in</strong>ches at Gladstone, Colorado,was significantly larger than o<strong>the</strong>r ra<strong>in</strong>fall observations for <strong>the</strong> storm, especially consider<strong>in</strong>g Gladstone isat an elevation <strong>of</strong> 10,400 feet. Previous site-specific PMP studies for dra<strong>in</strong>age bas<strong>in</strong>s <strong>in</strong> southwesternColorado have considered this storm and consistently concluded that, although widespreadmoderate/heavy ra<strong>in</strong>s occurred <strong>in</strong> <strong>the</strong> region, <strong>the</strong> maximum daily precipitation value <strong>of</strong> 8.05 <strong>in</strong>chesreported at Gladstone is most likely <strong>in</strong> error, although <strong>the</strong> magnitude <strong>of</strong> <strong>the</strong> error is not known (McKee andDoeskens, 1997). Because <strong>of</strong> its <strong>in</strong>fluence on several site-specific PMP studies currently be<strong>in</strong>gcompleted for dra<strong>in</strong>age bas<strong>in</strong>s <strong>in</strong> western Colorado, a re-analysis <strong>of</strong> <strong>the</strong> Gladstone ra<strong>in</strong>fall observationwas performed us<strong>in</strong>g detailed storm ra<strong>in</strong>fall analyses, pale<strong>of</strong>lood analysis, and ra<strong>in</strong>fall-run<strong>of</strong>f model<strong>in</strong>gresults. The ma<strong>in</strong> conclusion is that <strong>the</strong> 1911 Gladstone observation is an error and should not to beused <strong>in</strong> subsequent hydrometeorological studies. After extensive review, <strong>the</strong> Colorado State Eng<strong>in</strong>eer'sOffice has accepted this conclusion (Colorado SEO, written communication, September 23, 2004). Thesignificance <strong>of</strong> <strong>in</strong>clud<strong>in</strong>g <strong>the</strong> 1911 Gladstone ra<strong>in</strong>fall observation is that it causes <strong>the</strong> PMP values <strong>of</strong>southwestern Colorado bas<strong>in</strong>s to be overestimated by about 25 percent.Geographic <strong>in</strong>terest: ColoradoSubject terms: geographic <strong>in</strong>formation systems, PMP, PMF, hydrologyBliss, Mark. Jet Grout<strong>in</strong>g for Seismic Remediation <strong>of</strong> Wickiup <strong>Dam</strong>, Oregon. <strong>Journal</strong> <strong>of</strong> <strong>Dam</strong><strong>Safety</strong> - Spr<strong>in</strong>g 2005 (V. 3 N. 1)To prevent failure due to strong ground shak<strong>in</strong>g dur<strong>in</strong>g a seismic event, <strong>the</strong> U.S. Bureau <strong>of</strong> Reclamationundertook a three-year project to modify Wickiup <strong>Dam</strong> <strong>in</strong> west-central Oregon. Analyses showed thatlow-density materials, susceptible to liquefaction under strong ground shak<strong>in</strong>g, were present <strong>in</strong> <strong>the</strong>foundation <strong>of</strong> <strong>the</strong> left abutment dike. A multi-discipl<strong>in</strong>ary team composed <strong>of</strong> geotechnical eng<strong>in</strong>eers,geologists, construction eng<strong>in</strong>eers, and experts <strong>in</strong> value eng<strong>in</strong>eer<strong>in</strong>g completed a Corrective ActionAlternatives scop<strong>in</strong>g study <strong>in</strong> January 1999. This study <strong>in</strong>dicated that jet grout<strong>in</strong>g <strong>of</strong> <strong>the</strong> foundationmaterials could be <strong>the</strong> least-cost alternative to stabilize <strong>the</strong> soils and prevent failure <strong>of</strong> <strong>the</strong> dam understrong ground shak<strong>in</strong>g. Because <strong>of</strong> a lack <strong>of</strong> historical <strong>in</strong>formation regard<strong>in</strong>g <strong>the</strong> potential cost andeffectiveness <strong>of</strong> jet grout<strong>in</strong>g <strong>the</strong> types <strong>of</strong> weak materials <strong>in</strong> <strong>the</strong> foundation <strong>of</strong> <strong>the</strong> dam, a jet grout<strong>in</strong>g testsection was constructed. The test section proved <strong>the</strong> effectiveness <strong>of</strong> jet grout<strong>in</strong>g <strong>in</strong> treat<strong>in</strong>g <strong>the</strong> requiredzones and answered Reclamation's questions about potential costs; thus, jet grout<strong>in</strong>g was selected as <strong>the</strong>preferred alternative. Follow<strong>in</strong>g preparation <strong>of</strong> f<strong>in</strong>al designs and a two-step negotiated contract process,a construction contract was awarded to Hayward-Baker Inc. <strong>in</strong> July 2001.