Version 2.1.0

Release Date


October 11, 2002

About Version 2.1.0


A full installation of Drainage Design Management System for Windows (DDMSW) 2.1.0 is required. Previous versions such as 1.8 and 1.5 cannot be upgraded to DDMSW 2.1.0. Before a full installation of DDMSW 2.1.0 is performed, you must save all DDMSW projects to a different or new folder, and then import them back to DDMSW 2.1.0.

Download the DDMSW 2.1.0 Executable Software (ZIP).

Release Notes


The Flood Control District of Maricopa County is pleased to announce the new release of DDMSW 2.1.0 (October 11, 2002). DDMSW 2.1.0 can be used for hydrological analyses for the Flood Control District of Maricopa County as outlined in the Drainage Design Manual, Volume I Hydrology (1995).

DDMSW 2.1.0 replaces DDMSW 1.8 and earlier versions of DDMSW and DDMS. There is no fundamental change in terms of hydrologic procedures compared with previous versions. Significant enhancements have been made in DDMSW 2.1.0. regarding graphing and reporting features. Computer bugs found in DDMSW 1.8 have been fixed.

Graphing & Reporting Features


The graphing and reporting features can be summarized as following. Please see the User's Manual (PDF) for more details.
  • DDMSW 2.1.0 plots peak discharges (cfs) or unit peak discharges (cfs/mile2) versus drainage areas (sq. miles) (in log-log scale) using the data from the 100-year storm HEC-1 runs. It allows users to zoom in/out on the graph and allows users to mouse-over any scatter points to see the basin/outlet names.
  • The USGS envelope curves, 100-year peak discharge relation curves for region, and 100-year peak discharge relation curves for low-to-middle-elevation areas are drawn on the graphs where the HEC-1 peak flows are drawn.
  • The curves based on (1) Malvick's regression equations (Malvick, 1980) and (2) Boughton's regression equations can also be drawn on the graphs where the HEC-1 peak flows are drawn.
  • DDMSW 2.1.0 plots rating curves based on HEC-1 input files (diversion DI-DQ, reservoir stage-volume, reservoir stage-discharge).
  • DDMSW 2.1.0 plots cross sections based on the HEC-1 channel routing data.
  • All the graphs can be cut/paste to Word/PowerPoint/Excel as raster data or object data.
  • DDMSW 2.1.0 can estimate flow velocities for sub-basins and routing reaches based on sub-basin data and HEC-1 results.
  • DDMSW 2.1.0 can estimate percentage of peak discharge attenuation for the routing reaches (for the total reach, and also per mile).
  • DDMSW 2.1.0 can report peak flow, runoff volume, velocity, and routing peak flow attenuation (total reach and per mile) in a tabular format. The tabular results can be exported in both dbf and pdf format.
  • DDMSW 2.1.0 can import an HEC-1 input file (which is not originally developed by DDMSW). Then, HEC-1 can be run to generate results. The peak flow results can be plotted against with all those regression equations such as USGS envelope curves. It may be noted that when you run HEC-1, you must select 100-year in order to plot the results. Rating curves for diversion, reservoir, and channel cross-sections cannot be drawn unless the KK cards are modified in the HEC-1 input file (please see page 4-9 in the user's manual).
The user's manual has been enhanced by adding a navigable table of contents.

Computer Bug Fixes


Computer bugs in DDMSW 1.8 have been fixed in DDMSW 2.1.0. The major bugs in DDMSW 1.8 are:
  1. Duplicates in sub basins report for certain projects.
  2. Rational method does not report enough decimal points for basin slope.
  3. The convergence in DDMSW's rational method has been improved.
  4. Drainage area unit conversion problem for importing DDMS files.
  5. Switch between different storm durations such as 2 hour, 6 hour, and 24 hour without re-creating a draft HEC-1 file.