HEC HMSOverview

8/12/2019 HEC HMSOverview

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Introduction to

HEC-HMS

Bill Scharffenberg

Hydrologic Engineering Center

US Army Corps

of EngineersHydrologic Engineering Center


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Objectives

Become familiar ith the !rogram and learn basic

conce!ts of !rogram organi"ation# data com!onents#

and simulation runs$

%nderstand the different hydrologic elements and the

methods available for each one$

See the different ty!es of results visuali"ation and

statistical summaries$

&revie advanced ca!abilities$


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&rogram Sco!e

'esigned to simulate atershed hydrology$( Surface ater modeling$( )rom meteorology to atershed outlet$

*ool +it of o!tions$

( ,enerali"ed modeling$( Mathematical model choices$( nalysis tools$

,ra!hical user interface( Ma! of the atershed$

( &oint-and-edit for entering and u!dating data$( ,ra!h and table dis!lays of simulation results$


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&rogram .imitations

'eterministic models$

%ncou!led models$( Eva!otrans!iration-infiltration$

( Infiltration-baseflo$

/o a0uifer interactions$

Constant !arameter values$

'endritic stream systems$( )lo s!lits !ossible but limited ca!ability$

/o donstream flo influence or reversal$( Bac+ater !ossible but only if contained ithin a reach$


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&roject

Container for main com!onents$( Basin model$

( Meteorologic model$

( Control s!ecifications$

lso holds additional com!onents$( *ime-series gages$

( &aired data functions$

( ,rid data sets$

&rovides analysis tools$( &arameter estimation using o!timi"ation theory$( 'e!th-area analysis for fre0uency storm$

Subdirectory name


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&rogram .ayout


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'ata Management

Configuration data and !arameters$( )iles ithin the !roject directory$

( utomatically created# saved# loaded# etc$

'ata Storage System HEC-'SS$

( *ime-series and !aired data can be manually entered orretrieved from e1ternal files$

( ,rid data can only be retrieved from e1ternal files$

( ll time-series results com!uted during a simulation$

utomatic data handling$( %nits conversion$

( Inter!olation or accumulation$


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Main Com!onents

Basin model gives the !hysical descri!tion of the atershed$( Subbasin2 atershed catchments here rain falls$( 3each2 rivers and streams$( 3eservoir2 dams and la+es$( 4unction2 confluence$

( 'iversion2 bifurcations and ithdrals$( Source2 s!rings and other model sin+s$( Sin+2 outlets and terminal la+es$

Meteorologic model describes atmos!heric conditions over theatershed land surface$( &reci!itation$

( &otential eva!otrans!iration$( Snomelt$

Control s!ecifications2 *ime control during a simulation run$


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&rogram !!lication

Create a ne !roject$

Enter time-series# !aired data# and grid data$

Create a basin model$

Create a meteorologic model$ Create control s!ecifications$

Create and com!ute a simulation run$

5ie results$

Create other alternatives# com!ute# and com!are results$

Save the !roject and e1it$


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Basin Ma!


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Hydrologic Elements


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Subbasin Infiltration

.oss rate methods2

( 'eficit constant$

( E1!onential$

( ,reen m!t$

( ,ridded deficit constant$

( ,ridded SCS$

( ,ridded SM$

( Initial constant$

( SCS curve number$( Smith &arlange$

( Soil moisture accounting$


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Subbasin Surface 3unoff

%nit hydrogra!h methods2

( Clar+$

( SCS$

( S-gra!h$

( Snyder$

( %ser-s!ecified$

Other methods2

( 6inematic ave$

( ModClar+ distributed$


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Subbasin Baseflo

Baseflo methods2

( Bounded recession$

( .inear reservoir$

( Monthly constant$

( /onlinear Boussines0$

( 3ecession$


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3each

3outing methods2

( 6inematic ave

( .ag

( Modified &uls

( Mus+ingum

( Mus+ingum-Cunge

( Straddle stagger

.oss7gain methods2

( Constant$

( &ercolation$


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3eservoir

3outing methods2

( Storage curve$

( Outlet structures$

( S!ecified release$

&ossible structures2

( ,ated s!illay 89 to :9;$

( Overflo 89 to :9;$

( Outlet 89 to :9;$

( &um! 89 to :9;$

( 'am brea+ 89 or :;$


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&reci!itation

Historical methods2( ,age eights$

( Inverse distance$

( %ser-s!ecified$

( ,ridded$ Hy!othetical methods2

( )re0uency storm$

( SCS storm$

( Standard !roject storm$


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Eva!otrans!iration

vailable methods2

( ,ridded &riestley-*aylor$

( Monthly average$

( &riestley-*aylor$


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Snomelt

*em!erature inde1

method$

( Subbasin band a!!roach$

( ,ridded a!!roach$


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Simulation 3un

Consists of one basin model# meteorologic model# and controls!ecifications$( &reci!itation or outflo ratio o!tion$( Start states o!tion$( Save states o!tion$

5ie results for the current simulation run using menu or toolbar( ,lobal summary table$ 5ie results for one element in the current simulation run using the

menu# toolbar# or basin ma!$( ,ra!h# summary table# time-series table$

5ie custom gra!hs and time-series tables for elements in different

simulation runs using the Watershed Explorer$


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,lobal Summary *able


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Element ,ra!h


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Element Summary *able


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Element *ime-Series *able


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Continuous Simulation


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,ridded Simulation

&reci!itation# eva!otrans!iration# and snomelt are

defined on a grid cell basis$

Infiltration and e1cess !reci!itation is com!uted

se!arately for each cell$

ModClar+ transform method is used to !rocess e1cess

!reci!itation into runoff at the subbasin outlet$

Better definition of subbasin res!onse2

( Storm is small com!ared to the subbasin si"e$

( Storm is very heterogeneous$


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dvanced 3eservoir )eatures

Interior flood !rotection !rojects$

( 3e!resents a !ond on the


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&arameter Estimation

utomated tool for estimating !arameters hen observed flo isavailable$


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'e!th-rea nalysis

)re0uency storm is often used for estimating flos due

to the :99-yr storm or other return intervals$

.arge atersheds often have many locations here flo

estimates are re0uired$

It can be tedious to develo! storms ith the correct area

for each of the locations$

nalysis tool uses a simulation run and automatically

adjusts the storm area for each selected location$


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,IS &re!rocessor

HEC-,eoHMS can be used to create basin models

using terrain data$

Start ith a digital elevation model$

Select a atershed outlet and then ,eoHMSautomatically delineates the atershed border and

!reliminary subbasins outlines$

djust subbasin outlets$

,eoHMS creates a basin model that can be im!ortedinto HEC-HMS and also creates database table of

!arameters that can be estimated from terrain and other

su!!lemental data layers$

Documents

HEC HMSOverview