Last Updated 09/24/03

Flash55 Hydrology Software for Windows

New in Version 4.0: Flash55 now includes rational method runoff computation, storm drain design, and hydraulic gradient calculation.

Due to increasing environmental concerns, stormwater management is becoming more and more complex. In answer to the growing demand for stormwater management design tools RAMSS has developed a series of software packages. The process of developing better stormwater management solutions begins with the collection of accurate data. To accomplish this RAMSS has developed Flash55, a TR-55 method hydrology package with advanced data collection and storage capabilities. Some of the powerful features provided by Flash55 include:

[Flash55 CN Screen]

Graphical User Interface allows you to edit multiple files simultaneously.
Unlimited number of drainage areas per file, subareas per drainage area, and Tc path segments per drainage area.
User enters land usage and soil group and the software selects the correct CN number and percentage of impervious area.
Total impervious area is computed automatically.

For Tc and Tt computations, a starting elevation, an ending elevation, and a flow path length are entered. Slope is determined from this data. This simplifies the revision process and eliminates hard to find errors.
Five flow types are provided for Tc and Tt paths. These include Sheet, Shallow Concentrated, and Channel Flow as used in SCS' TR-55. Also provided are Pipe Flow (data entry is the same as for channel, but it provides a more descriptive label), and Timed Flow (for use when you wish to use a Tc from some other computation).
Flash55 interfaces with HYDROmate, RAMSS' TR-55 method hydrology software for the HP48 handheld, to automate the collection of data.
All tables may be edited to add land usages, surface descriptions, or rainfall data specific to your area.

Printed output from Flash55 is numerically equivalent to that from other TR-55 method hydrology software. The additional data included, and the easy to understand format are what places Flash55 ahead of the pack.

Data files are designed to contain a complete project, including an unlimited number of areas, to simplify your file management chores. An unlimited number of Rainfall Frequency Tables may be stored and accessed by name. Rainfall distribution type and rainfall depth information can be entered at the time of installation and need not be reentered. The metric system will soon be required on some jobs and Flash55 is ready. Areas may be measured in Acres, Miles², Hectares, and Kilometers².

Computations for a single drainage area, including CN, Tc, Tt, and Qp calculations, are all printed in an easy to read format, on a single page if possible.

Graphical peak discharge information is computed for a maximum of 7 storms. This allows the frequently used 1, 2, 5, 10, 25, 50, and 100 year events to all be computed.

Summary table provides weighted CN, impervious area, Tc, and the peak discharge for a user specified storm frequency. Once you have completed the data collection, this provides a concise summary of the information needed for the next phases of your project. A single sheet of paper can give you all the data you need, where previously you had to leaf through up to 100 pages.

Flash55 runs on Windows 95, 98, NT, 2000, or XP. 5 meg disk space is required. 800x600 or better graphics is recommended.

Other Hydrology & Hydraulics Software * RAMSS Surveying Software

RAMSS Inc. * Surveying & Engineering Software
54 Winters Street * Westminster, MD 21157
800-617-7267 Sales * 410-876-7267 Support * 410-876-7603 Fax

Revision History
02/10/99 Minor reformatting, new background
03/01/99 Added META, minor revisions per weblint
09/24/03 renamed Win32 page, added meta Description, added 55-400,