Technical Release 20, commonly known as TR-20, is a physically based watershed scale runoff event model. Developed to predict the runoff resulting from rainfall over a watershed, the TR-20 enables the routing of the developed hydrographs through stream and valley reaches as well as through reservoirs. The hydrographs are combined from tributaries with those on the main stream stem. Branching flow (diversions) and baseflow can also be accommodated.

Download TR-20 StormNET Software
File Size: 106068037 bytes
File Date: Wed Apr 23 05:41:02 2008

Download TR-20 Software from NRCS (ZIP File)
File Size: 260408 bytes
File Date: Tue Apr 3 08:28:34 2007

To download the following FEMA technical documents, check the box of the desired documents below and then click the "Download Selected" button. An e-mail will be sent to you with the download links. These documents are available in Adobe Acrobat 4.0 PDF format.

Download FEMA Flood Insurance Study Guidelines and Specifications (PDF File)

Download FEMA Flood Insurance Study Guidelines and Specifications (PDF File)

File Size: 513134 bytes
File Date: Tue Mar 14 05:40:59 2006

The Federal Emergency Management Agency (FEMA) has compiled the Flood Insurance Study Guidelines and Specifications for Study Contractors to define technical policy and procedures to be followed in the preparation of FISs, restudies, and LMMP projects. Adherence to these guidelines is required in the Contract Statement of Work. Performance in accordance with these guidelines is required of any contractor preparing a FIS, restudy, or revision unless otherwise specified in the contract.

To download the following EPA technical documents, check the box of the desired documents below and then click the "Download Selected" button. An e-mail will be sent to you with the download links. These documents are available in Adobe Acrobat 4.0 PDF format.

Download TR-20 Documentation (PDF File)

Download TR-20 Documentation (PDF File)

File Size: 12630170 bytes
File Date: Tue Apr 3 08:28:30 2007

Technical Release 20 (TR-20) User's Manual.