600SR97080
United States
Environmental Protection
Agency
National Exposure
Research Laboratory
Research Triangle Park, NC 27711
Research and Development
EPA/600/SR-97/080 August 1997
&EPA Project Summary
Hydrological Simulation
Program—FORTRAN
User's Manual for Version 11
Brian R. Bicknell, John C. Imhoff, John L Kittle, Jr., Anthony S. Donigian, Jr.,
and Robert C. Johanson
The Hydrological Simulation Pro-
gram—FORTRAN (HSPF) is a set of com-
puter codes that can simulate the hy-
drologic and associated water quality
processes on pervious and impervious
land surfaces and in streams and well-
mixed impoundments. In this way,
nonpoint source loads of sediments, or-
ganic pollutants, oxygen-demanding
materials, and nutrients are generated
that can easily be combined with im-
posed point sources within the HSPF
system for watershed and basin-scale
environmental management The manual
discusses the structure of the system
and presents detailed discussion of the
algorithms used to simulate various
water quantity and quality processes.
It also contains all of the information
necessary to develop input files for ap-
plying the program, including descrip-
tions c-f prC'grsiii opiiG.ic, parsnict^r
definitions, and detailed input format-
ting data.
This Project Summary was developed
by the National Exposure Research
Laboratory's Ecosystems Research Di-
vision, Athens, GA, to announce key
findings of the research project that Is
fully documented In a separate report
by the same title (see Project Report
ordering Information at back).
The Hydrological Simulation Program—
FORTRAN, first distributed in 1980, is a
comprehensive package for simulation of
watershed hydrology and water quality for
both conventional and toxic organic pol-
lutants. HSPF incorporates submodules
into a basin-scale analysis framework that
includes pollutant transport and transfor-
mation in one-dimensional stream chan-
nels.
HSPF is the only comprehensive model
of watershed hydrology and water quality
that allows the integrated simulation of
land and soil contaminant runoff processes
with point sources and in-stream hydrau-
lic and sediment-chemical interactions. The
result of this simulation is a time history of
the runoff flow rate, sediment load, and
nutrient and organic pollutant concentra-
tions, along with a time history of water
quantity and quality at any point in the
water column and benthic compartment in
a watershed. HSPF simulates three sedi-
ment types (sand, silt, and clay) in addi-
tion to a single organic chemical and trans-
formation products of that chemical.
Preparation of the updated Version 11
of HSPF was funded by the U.S. Geologi-
cal Survey, in cooperation with the U.S.
Army Corps of Engineers and the U.S.
Environmental Protection Agency's (EPA)
Chesapeake Bay Program Office, Region
III, and the Ecosystems Research Divi-
sion (Athens GA) of the National Expo-
sure Research Laboratory. Documentation
and code may be obtained by accessing
EPA's Center for Exposure Assessment
Modeling home page. The address is http:/
/www.epa.gov/CEAM (case sensitive).
Printed on Recycled Paper
SM-X3
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Brian R. Bicknell, John C. Imhoff, John L Kittle, Jr., and Anthony S. Donigian, Jr.,
are with AQUA TERRA Consultants, Mountain View, CA 94043; Robert C.
Johanson is with the University of the Pacific, Stockton, CA 95204.
frank E. Stone//, Jr. is the EPA Project Officer (see below).
The complete report, entitled "Hydrological Simulation Program—FORTRAN:
User's Manual for Version 11," (Order No. PB97-193114; Cost $92.00, subject
to change) will be available only from:
National Technical Information Service
5285 Port Royal Road
Springfield, VA 22161
Telephone: 703-487-4650
The EPA Project Officer can be contacted at:
Ecosystems Research Division
National Exposure Research Laboratory
U.S. Environmental Protection Agency
Athens. GA 30605-2700
United States
Environmental Protection Agency
Center for Environmental Research Information (G-72)
Cincinnati, OH 45268
Official Business
Penalty for Private Use $300
BULK RATE
POSTAGE & FEES PAID
EPA
PERMIT No. G-35
EPA/600/SR-97/080
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