Drainage Design Manual, Hydrology - Flood Control District of ...

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Drainage Design Manual for Maricopa County Hydrology: Acknowledgements, Comments & Revisions Comments Users of this manual are strongly encouraged to submit any comments, criticisms, or findings of errors. This information should be addressed to: Engineering Division Manager Flood Control District of Maricopa County 2801 West Durango Phoenix, AZ 85009 Because of ongoing legal and technical changes in the field of stormwater management, revisions to this manual will be required from time to time. Such revisions will take place on an ongoing, as needed basis and will be posted on the FCDMC’s Web page (www.fcd.maricopa.gov). A separate document available on the FCDMC’s Web page will summarize revisions made after the release of this fourth edition. Revisions Because of ongoing technical and administrative changes in the field of stormwater management, revisions to this manual will be required from time to time. Such revisions will take place on an ongoing, as needed, basis and will be posted on the FCDMC’s Web page (www.fcd.maricopa.gov). The dates of revision and an overview of changes made are listed below. 1st Edition September 1, 1990 2nd Edition June 1, 1992 3rd Edition January 1, 1995 4th Edition August 15, 2013 Overview of Changes Made in the Second Edition Title - The title of the document has changed. The hydrology and hydraulics manuals are now the Drainage Design Manual for Maricopa County, Volumes I and II, respectively. Adoption - A copy of the Agenda Form, signed by the Board of Directors on April 15, 1991, is included. This form indicates formal adoption of the manual, requiring its use by jurisdictions that cost-share with the District in flood control projects, by contractors working for the District, and by all parties submitting drainage reports and studies to the District for review and approval. ii August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Acknowledgements, Comments & Revisions Document Page Numbering - Page numbering has changed to section numbering rather than consecutive (i.e., 1-1, 2-1, 3-1, etc.). Chapter 2 - The rainfall chapter has been substantially condensed. The computer program PRE- FRE has been added to ease development of rainfall statistics for sites outside the Phoenix metropolitan area. The PREFRE user's manual is included with the manual as Appendix J. An additional isopluvial map with 2-hour, 100-year depths has been added. Chapter 3 - New roughness factor descriptions were developed. “C" coefficients will now be adjusted to reflect storm frequency, and a new table is included. A computer program RATIO- NAL.EXE is included for development of discharges and volumes using the Rational Method. Chapter 4 - The methodology used to develop Green and Ampt loss parameters has been substantially modified and simplified. The section on the Initial plus Uniform Loss Rate Method has been reduced, and limitations for the use of that method are provided. An equation is provided for calculation of the XKSAT vegetation adjustment coefficient. Chapter 5 - New land classification descriptions are provided to facilitate selection of parameters in the K b equation. An error was corrected in the Lag equation (the Corps of Engineers uses C = 24K n instead of C = 20K n ). The MCUHPl and MCUHP2 computer programs were revised to reflect our change of address, some data inputs were added to facilitate revisions and an error was corrected in the 2-hour storm distribution (the program was underestimating T c because of an incorrect summation of the first three rainfall excess values). Chapter 6 - The routing chapter now includes guidance on using the Muskingum-Cunge routing option recently available in HEC-l. A sample problem is included in the Examples section. Chapter 7, the Appendices, and the Examples - All have been updated to incorporate the changes outlined above. Overview of Changes Made in the Third Edition In addition to the correction of a few typographical errors, changes of January 1, 1995 revision of the Drainage Design Manual, Volume I, Hydrology included the following: Chapter 2 -The SCS Type II rainfall distribution is recommended for use for the 24-hour general design storm. Areal reductions of point rainfall are to be made with Table 2.1, which is based on the NWS-HYDRO 40 data. Guidelines have also been added as to when to select the general storm for use in design hydrology in Maricopa County. August 15, 2013 iii
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