HEC-1 Flood Hydrograph Package

1 US Army Corps of EngineersHydrologic Engineering Center GENERALIZED COMPUTER PROGRAMHEC-1 Flood Hydrograph PackageUser s ManualJune 1998 CPD-1 AApproved for Public Release. Distribution DOCUMENTATION PAGEForm ApprovedOMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources,gathering and maintaining the date needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of thiscollection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 JeffersonDavis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC AGENCY USE ONLY (Leave blank)2.

2 REPORT DATEJune 19983. REPORT TYPE AND DATES COVEREDC omputer Program Document4. TITLE AND SUBTITLEHEC-1 Flood Hydrograph Package User's Manual5. FUNDING NUMBERS6. AUTHOR(S)Hydrologic Engineering Center7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)US ARMY CORPS OF ENGINEERSHYDROLOGIC ENGINEERING CENTER (HEC)609 Second StreetDavis, CA 95616-46878. PERFORMING ORGANIZATION REPORT NUMBERCPD-1A9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES)10. SPONSORING / MONITORING AGENCY REPORT NUMBER11. SUPPLEMENTARY NOTES12a. DISTRIBUTION / AVAILABILITY STATEMENTA pproved for Public Release. Distribution is DISTRIBUTION CODE13. ABSTRACT (Maximum 200 words) User's manual for a watershed computer program model that simulates the precipitation-runoff process.

3 Watershed is represented by basic model components; precipitation runoff, channel routing, reservoir routing,diversion and Hydrograph combinations that are used to estimate hydrographs at various locations. Othercapabilities include automatic parameter estimation and Flood damage analysis. The model is limited to singleevent analysis and routing techniques do not account for downstream backwater SUBJECT TERMSP recipitation-Runoff Model, Flood Damage Analysis Computer Program15. NUMBER OF PAGES43316. PRICE CODE17. SECURITY CLASSIFICATION OF REPORTUNCLASSIFIED18. SECURITY CLASSIFICATION OF THIS PAGEUNCLASSIFIED19. SECURITY CLASSIFICATION OF ABSTRACTUNCLASSIFIED20. LIMITATION OF ABSTRACT UNLIMITEDNSN 7540-01-280-5500 Standard Form 298 (Rev.)

4 2-89)Prescribed by ANSI Std. Z39-18298-102 HEC-1 Flood Hydrograph PackageUser s ManualJune 1998 Hydrologic Engineering CenterUS Army Corps of Engineers609 Second StreetDavis, CA 95616 CPD-1A(530) 756-1104 Version previous versions of HEC-1 are as follows:Version 1968 Version 1973 Version 1981 Version 1990 Version 1991 (Large-Array Version with Extended Memory Manager)iiiPrefacePrevious versions of this manual were created out of the need to describe a new release of theHEC-1 program which included significant enhancements and improvements. This version, however,was motivated by the need to put the HEC-1 Package in order for a final release during the transition to itsreplacement, the Hydrologic Modeling System, HEC-HMS.

5 Subsequent watershed modelingimprovements are being focused on HEC-HMS which was released in March functional differences between the 1990 version of HEC-1 and the 1998 version are notsignificant. Therefore, the content and format of this manual does not vary appreciably from the previous,1990, version. Several small errors have been corrected, and references to other updated documents havebeen changed to include the new documents. vTable of iiiList of xList of xiiiSection1 Introduction .. of Manual .. Assumptions and Requirements .. 32 Model Components .. Network Model Development .. Surface Runoff Component .. Routing Component .. Use of River Routing and Subbasin RunoffComponents.

6 Component .. Component .. 73 Rainfall-Runoff Storms .. and and Uniform Loss Loss Curve Loss and Ampt Infiltration Snowmelt and Rain 21viTable of Contents(continued) Hydrograph .. Methodology .. Unit Hydrographs .. Runoff Using Kinematic Wave and Concepts for Kinematic Wave Procedure .. Concepts for Muskingum-Cunge .. Puls .. R and D .. Reservoir Routing .. Reservoir Storage and Elevation fromInflow and Outflow .. vs. Kinematic Wave .. Plants .. 514 Parameter Hydrograph and Loss Rate Parameters .. of Optimization of the Calibration Capability(from Ford et al.)

7 , 1980).. Parameters .. 59viiTable of Contents(continued)SectionPage5 MultiPlan-MultiFlood 606 Dam Safety Analysis .. Safety Analysis Methodology .. Overtopping (Level Crest) .. Overtopping (Non-Level Crest) .. Breaks .. 677 Precipitation Depth-Area Relationship 708 Flood Damage Principle .. Reach Damage Computation Curve Annual Damage (EAD) Event Damage Curve 789 Flood Control System Model Procedure .. 81viiiTable of Contents(continued)SectionPage10 Input Data of Input Features for Input Input Control .. Series Repetition Simulation Data Retrieval from the HEC Data Storage System(DSS).

8 9111 Program Output .. Data Simulation to HEC Data Storage System (DSS).. 9812 Example Problems .. Problem #1: Stream Network Model .. Problem #2: Kinematic Wave Watershed Problem #3: Snowmelt Runoff Problem #4: Unit Graph and Loss Rate Problem #5: Routing Parameter Problem #6: Precipitation Depth-Area Simulationfor a Basin .. Problem #7: Dam Safety Analysis .. Problem #8: Dam Failure Problem #9: Multiflood to Example Problems#9, #10, #11 and # 197ixTable of Contents(continued) Problem #10: Multiplan, Multiflood Problem #11: Flood Damage Problem #12: Flood Control System Problem #13: Using the HEC Data Storage Systemwith HEC-1 .

9 Problem #14: Calculating Reservoir Storage andElevation from Inflow and Problem #15: Muskingum-Cunge Channel 26813 Computer Operation and File 27714 References .. 280 AppendicesAHEC-1 Input A-iBHEC-1 Usage with HEC Data Storage B-iIndexxList of River Basin .. River Basin Rate, Rainfall Excess HEC Loss Rate Function for Snow-Free Ground .. Dimensionless Unit Graph .. Between Flow Wave Parameters for Various Channel Difference Method Space-Time on x-t Plane of the Variable ParameterMuskingum-Cunge Flow Diagram .. Depth Storage-Outflow Channel Method for Reservoir Calculation for Hydrologic and Multiplan Adequacy and Dam Overtopping Variables in Dam Crest.

10 Dam-Breach Precipitation Depth-Area Precipitation Depth-Area Reduction Frequency Curve .. Frequency Input Data Organization for a River Gage Data for Subbasin-Average Network Model Wave Model Basin .. Depth-Area Analysis Bear Creek Creek Downstream Cross Sections .. River Basin .. "PLAN 2" Rockbed Basin "PLAN 3" Rockbed Basin Creek Watershed for Muskingum-Cunge ChannelRouting Example .. Channel .. Cross Program Operations 277xiList of of Maximum 6-hour SPS or PMP In Percent of6-hour of Maximum 1-Hour SPS or to Equivalent-Annual Series ConversionFactors .. Rainfall Conversion Factor for Overland Flow.