Hydrologic Issues for Dams - Association of State Dam Safety Officials

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• Surface Runoff• Interflowo Mountainous area Depth-Area-Duration storm analysis• NEXRAD• Satellite Imagery• Policyo Hydrologic and Flood Safety Criteria• New dam construction• Existing dam evaluationDavid Bowles – Utah State University• Risk Assessmento Probabilistic extreme flood estimateso Frequency curve extrapolationo AEP of extreme eventsBob Jarrett – US Geological Survey• Physical Processes of floodingo Sediment Transporto Deposition during Floodso Sediment Depositiono Surface Erosion Thresholds• Peak Discharge Estimates• Paleoflood Peak Discharge Estimateso Hydraulic Modelingo Absolute Age Dating of Depositso Validation of Relative Age Dating Methods• Guidelines for Flood-Frequency Parameter Estimation• Regional Flood-Frequency Analysis with Paleoflood DataResearch Needs Summary 180
DISCUSSION1. Genera l – After the presentation of papers, and some general group discussion, theworksh op participants divided into 3 smaller discussion groups. These groups, and theirdiscussion subjects, were:Risk Analysis Group – Items relating to uncertainty factors that influence reservoirinflow values and the computation of the Annual Exceedance Probability (AEP)of extreme floods.• Storms and flood database• Extension of flood frequency curves• Develop regional hydrology parameters.Standards Group – Items relating to physical factors that influence the methodologyfor the computation of extreme floods, including the PMF.• Improve Technology Transfer• Develop Regional Databases• Loss Rate Function AnalysisMeteorology Group – Items relating to rainfall analysis from both the standards basedanalysis and a risk-based analysis.• Precipitation Analysis• Rainfall frequency analysis• Real time storm analysisEach grou p was challenged to boil down the research needs presented by eachorganization then generate, and prioritize, what they felt are the most pressing needs fordam safety research within their group. After a period of discussion in the small groups,the worksh op participants reassembled and each group presented their opinions onresearch needs. The group related research items are presented below, in their order ofgroup-defined importance.2. Research Needs – After a period of discussion, the workshop participants reassembledand each group boiled down the research needs presented in each paper and presentedtheir opinions on research needs. The research needs generated by each group arepresented below in their order of group-defined priority.Risk Analysis Group• Develop a historical database of storms and floods that can be used foranalysis.• Develop an approach to extend flood frequencies to smaller AEP’s.• Develop regional hydrology parameters.• Develop an approach to consider storm series.• Continue to develop stochastic rainfall/runoff models.181Discussion
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The National DamSafety ProgramResea
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collaboration and expertise, and th
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TABLE OF CONTENTSPage #FOREWORD....
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NEW DEVELOPMENTS AND NEEDS IN SITE-
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FOREWORDThe Federal Emergency Manag
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The PMF represents an estimated upp
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RESEARCH AREASResearch needs were b
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Lack of Historical Data for Extreme
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should be developed that will allow
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• Storms used in HMR 55A and in t
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last 20,000 year s in submitting th
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d. USBR Guidelines Publication, Dam
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was severe. There was a potential,
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Thirdly, we must develop better way
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For most projects, the first step f
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Instead of lumping the loss rates t
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adjust the rating curve for when th
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In response to this situation, TVA
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TVA established a Regional Resource
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The Utah Hydrological ExperienceByM
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The Utah Hydrological ExperienceByM
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Late SpringRain on snow eventModel
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State of GeorgiaFEMA Workshop on Hy
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a. HEC1• DOS based program - glit
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Long te rm hydrologic needs include
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Current State and County PracticesA
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present standards and, as such, are
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Research Needs in Dam Safety Analys
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Looking at the four test cases give
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Hydrologic Analyses Related to Dam
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(iii) Modified Expected Cost Approa
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Parameter Estimation Based on Joint
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estimation of lag times and loss ra
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Hydrology for Dam Safety - Private
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Probable Maximum PrecipitationAll o
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The most common synthetic methods a
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the standard would be very conserva
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65Paper 12 - Cecilio
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REFERENCES1. U. S. Army Corps of En
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Overview of Flood Estimation Proced
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Extreme FloodsExtreme floods, the t
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Temporal patterns used to distribut
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Preliminary Estimates of Rainfall a
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24 to 72 hours). CRC Research Repor
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CURRENT AND FUTURE HYDROLOGIC RESEA
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ecause existing procedures are inad
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REGULATORY INVOLVEMENT AND COMMUNIC
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Decision BasisThe third feature of
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However, should it be revealed that
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supporting sub-processes. Therefore
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Probability ofFailure P f1Probabili
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Since any rigorous analysis is an i
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well, and usually do include subjec
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Against this background, there is n
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Howson, Colin., and Peter. Urbach.
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Procedures and Analysis Technologie
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Currently transposition limits for
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pro cedures are used to allow the h
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Use of Atmospheric Models in Rainfa
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mountain watersheds in response to
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18. Schaefer MG, Stochastic Modelin
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dams which could be used to save li
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Hydrodynamic modelMIKE 21 BACKGROUN
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A FRAMEWORK FOR CHARACTERIZATION OF
Page 133 and 134: c) Decision Level Risk Assessment:
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Page 141 and 142: used to estimate frequency distribu
Page 143 and 144: Hosking, J.R.M., and J.R. Wallis, 1
Page 145 and 146: in west central Arizona. The draina
Page 147 and 148: Trial and error reservoir routings
Page 149 and 150: Figure 1 Alamo DamAlamo Dam and Spi
Page 151 and 152: Paper 19 - Chieh and Evelyn 146
Page 153 and 154: esources are made to mitigate flood
Page 155 and 156: implementing a risk-assessment meth
Page 157 and 158: Typically, the elevation of the top
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Page 165 and 166: 10000x Peak Discharge95% confidence
Page 167 and 168: An integrated science approach will
Page 169 and 170: ReferencesBaker, V.R., Kochel, R.C.
Page 171 and 172: Partnerships, Proceeding of the 200
Page 173 and 174: Flood HydrographThe flood hydrograp
Page 175 and 176: A variety of data including informa
Page 177 and 178: Improved Flood Frequency Extrapolat
Page 179 and 180: RESEARCH NEEDS SUMMARYJerry Webb, H
Page 181 and 182: o Unsteady flow computer models for
Page 183: • Upd ate “Generalized Snowmelt
Page 187 and 188: participant was asked to pick what
Page 189 and 190: RISK ANALYSIS100Relative Comparison
Page 191 and 192: WORKSHOPONHYDROLGIC RESEARCH NEEDSF
Page 193: JOE SKUPIENPrincipal Hydraulic Engi
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Hydrologic Issues for Dams - Association of State Dam Safety Officials

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