Version 3.5 – March 20, 2015 D R A F T
Prepared without agency or user
support. Use at your own risk. Technical assistance available for a
fee.
Test against output from Version
3.4 for existing projects and notify us of any discrepancies.
Compatible with Excel 2003, 2010, 2013 and
Windows 7, 8 or 10.
Corrected scale error in particle files
(NURP50.p8p, P8_default.p8p) and sample case files. The Zinc content of Particle Fraction 1
was previously set at 10x the initially calibrated value (640000 vs.
64000). Case files for previous
versions can be corrected via “Edit/WQ Components” dialogue. Edit the Zinc content value directly or
read the updated particle file via the “Edit/WQ Components/Read
File” dialogue.
In the “Charts” dialogue, the
output workbook (“P8_Charts.xlsm”) must be updated manually each
time it is opened via the “Click Me First” button.
Corrected problems with the
“File/Open” dialogue so that existing case files in the source
directory are automatically displayed.
The default file extension for input air
temperature files has been changed from *.tmp to *.tem. This is to avoid accidental deletion of
files by Windows Disk Cleanup utility, which assumes that *.tmp
files are temporary and not used by applications. Sample cases have been updated to
reflect the new file extension.
Web help
files have been partially updated to reflect V 3.5. The locally-installed help
file (p8.chm) still refers to V 3.4.
Supports conversion of temperature and
precipitation files from Excel formats.
Does not support conversion of precipitation
files from NOAA, Earth Info, or P8 Version 1.
Does not support conversion of input files
from P8 DOS versions.
Other minor bug fixes and enhancements.
Version 3.4 - October 30, 2007
Revised
Runoff algorithm for impervious surfaces.
Runoff coefficients specified on the Watersheds
screen apply to storms with cumulative rainfall + snowmelt <= the "breakpoint" specified on
the 'Edit General
' screen. A runoff coefficient of 1.0 is assumed when the cumulative
rainfall + snowmelt exceeds the specified breakpoint, regardless of the value
specified on the watershed screen. The default breakpoint value (0.8
inches) is consistent with SLAMM calibrations.
The breakpoint is automatically set to 0.8 inches when an input file created in
Versions <=3.2 is read. This change impacts runoff simulations from
watersheds with specified runoff coefficients < 1. While it is likely
to provide more accurate simulations, setting the breakpoint to 999 will
maintain consistency with previous versions. Setting the watershed runoff
coefficient to 1.0 will produce conservative results for typical urban
watersheds
Runoff algorithm modified to include indirectly-connected
impervious areas (draining to pervious areas that in turn drain to watershed
outlet). Previous versions assumed that indirectly-connected impervious
areas were considered by the user in estimating the Curve Number for pervious
areas. In the current version, the Curve Number reflects pervious areas
only (function of soil type & cover) and the indirectly connected
impervious fraction is estimated independently.
Impervious
area runoff parameters (depression storage, runoff coefficient) consistent with
runoff volumes predicted by the Source Loading
and Management Model (SLAMM) for Wisconsin watersheds are provided in the
documentation.
Added
several options for swale/buffer
hydraulics . These allow depth-dependent Manning's n according to various
published relationships for grassed swales & treatment wetlands.
Enhanced
Stage/Discharge output table to include additional hydraulic variables relevant
to BMP design (e.g., hydraulic load, hydraulic residence time, flow per unit
width, manning's n).
Interface
settings for output destination (Excel, Text, Notepad)
and output window (devices, particles, water quality components) are
saved with the case file so that they don't have to be reset each time the case
is read.
Additional
guidance on street sweeping routine.
The default particle files (NURP50 & NURP90) contain revised values for
sweeper efficiency, which apply only to vacuum sweepers. Current information
indicates that the efficiency of broom sweepers is negligible for particles in
the size range typically found in runoff.
The file format for importing and exporting watershed
data from Excel or ASCII files is modified relative to that used in Version
3.2. Import files created for Version 3.2 files will have to be
re-formatted for use with Version 3.4. See 'File Watersheds
Import/Export'.
Access
to an online help file is provided from the menu. This contains the same
information as the local help file distributed with the program.
Various
repairs & minor enhancements to previous versions.
Limited testing with Windows VISTA and/or
Excel 2007. n VISTA installations, the
default program location specified in the setup procedure:
"C:/Program Files/P8 Urban Catchment Model..." must be
moved outside of the "/Program Files" directory, e.g. to
"C:/P8/..."
Version 3.2 - June 30, 2007
Various repairs & minor enhancements.
Added procedures for importing and exporting watershed data from
Excel or ASCII files. See 'File Watersheds Import/Export'.
Added procedure for listing watershed data in
the import/export format; see 'List Inputs Watersheds'
Added option to select air temperature and
precipitation files from disk on the General
Inputs screen.
The maximum number of watersheds has been
increased to 250. The maximum number of devices has been increased to 75.
In previous draft windows versions, the default input file (read each time P8 starts),
there was an error in the 5-day antecedent precipitation values used in
simulating runoff from pervious areas. These are entered on the 'Edit ET/Snowmelt' screen. Values for the growing
season and non-growing season were reversed in the default input file, which is
loaded automatically each time P8 starts up. This is corrected in
Version 3.2. Any new cases created using previous windows versions
and starting from the default input file should be corrected
accordingly. See the 'Edit ET/Snowmelt' help screen or the current
default input file for the correct values. If case watershed loads are
primarily from impervious surfaces or if the input file was converted from the
DOS version, this issue should not have a significant impact on results.
Users are advised to test sensitivity of
results to the integration step size. Start with at least 4 steps per
hour. See further discussion
.
Check out the EPA CEAM website as
potential source of rainfall & temperature data http://www.epa.gov/ceampubl/tools/metdata/us_met.htm
These data formats are not directly supported but can be imported via Excel
(see Air Temperature Data and Precipitation Data )
This version seems to work with Windows VISTA
and Excel 2003. It does not work with Excel 2007. That will be
supported in a future release.
Version 3.1 - February 28, 2007
General repairs.
Added date range checks for input
precipitation files.
Version 3.0 - Nov 17, 2006
Utility added for importing precipitation data from Excel
worksheets. (File Translate Precipitation)
Utility added for importing temperature data from Excel
worksheets. (File Translate Temperature)
Added output table 'List
Tributary Areas' . Lists watershed
areas tributary to each device. Total and scaled vs. device dimensions.