In the last two and a half years, the AASHTO Technical Committee on Hydrology (TCHH) and Hydraulics has been revising the Model Drainage Manual to update its contents and to make it more user-friendly, and accessible. To accomplish this, TCHH decided to publish two manuals: one on policies and guidance and the other on design procedure. The reasons for splitting the manual are: 1. bulk reduction, 2. organization, 3. customer needs and preferences, 4. simplicity. 1. Bulk Reduction The current manual is very large. It includes policies, procedures and large appendices. The new manual would divide policies from procedures and appendices. Each chapter of the new version will stand alone, for customer interested on single subjects (policies or procedures). 2. Organization The new manuals will group related topic and sciences together. It will separate the policies from recommended procedures, allowing policy maker to consult one manual and practitioners to use another. The procedural part will be updated more often to reflect changes in the Hydraulic Engineering Circulars (HECs) and completed researches. 3. Customer Needs and Preference Our customers expressed the need for a more flexible manual. The new manual will be sold in chapters to allow the users, whether they are from public or private organizations, to use the part of the manual they need, instead of having to buy all the chapters together. 4. Simplicity The new manual will reduce duplication, redundancies and have a consistent language style.

Publish the new AASHTO Policy on Highway Drainage, and Drainage Design Manual for publication, according to AASHTO Publishing Guidelines.

The consultant will: Complete the master table of contents of the new manual. Review the new manual for content¿s consistency, accuracy, duplication, language and grammar, emphasizing on format and style. Check computations, equations, numbers and verify answers. Reconcile chapter content, checking references to other chapters, proposing revisions to the new manual to correct inconsistencies. Check manual¿s references. Provide that all graphs, charts and pictures are accurate and have clear reproducible quality. Propose chapter re-organization according to subject. Get any needed copy-right approval. Prepare the new manual for publication conforming to AASHTO Technical Publication Requirements. Correlate with AASHTO to finalize the manual format according to AASHTO. Advise the TCHH for any other possible improvements to the manual. Commitment Required: From each state: $10,000 for two years Total min. commitments: $ 400,000 Number of Months Study Will Last: 36 months Commitment Start Year: 2008

Project has been transferred to NCHRP