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

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Drainage Design Manual for Maricopa County Hydrology: Acknowledgements, Comments & Revisions Chapter 3 - The RATIONAL.EXE program has been updated to better match 10-year rainfall intensities for durations between 10 and 20 minutes as shown on the I-D-F curve, . The revised program is supplied on the DDMS diskette available with this revision (see 6. below). Chapter 4 - A table has been added to help with the selection of IA, RTIMP, and percent vegetation cover for representative urban land use types in Maricopa County. Chapter 5 - Two new S-graphs have been added for use in Maricopa County. The newly added S-graphs are the Desert/Rangeland S-graph and the Agricultural S-graph. A table has also been added to facilitate the selection of S-graph type and K n values for those S-graphs for estimation of basin lag time. Chapter 6 - The Normal-Depth routing method has been added to the Manual as an additional routing method for use in flood hydrology studies in Maricopa County. Appendix I - A new computer program and user's guide have been added to this revision of the Manual. The new program brings together the PREFRE program, a modified version of the loss parameter spreadsheet functionality, and the MCUHP programs to speed up the creation of HEC-I models using the methodologies recommended in the Manual. Additionally, two changes have been made to the MCUHP programs. First, the SCS Type II 24-hour design storm temporal distribution has been corrected and is now entered into the HEC-I data file as a 15 minute distribution. Second, the two S-graphs added to Chapter 5 have been incorporated into the MCUHP2 program. Appendix K - An appendix of K n values for various real watersheds has been supplied for additional help in the selection of watershed K n values. These data were taken from a report by George V. Sabol Consulting Engineers, Inc., performed for the District since the last Manual revision. Overview of Changes Made For The Fourth Edition All Chapters - Policies and standards were removed to a separate volume entitled Policies and Standards for Maricopa County, Arizona, 2003. This allows each jurisdictional entity to customize its policies and standards to meet its community’s needs. Also all references to the MCUHP programs were changed to DDMSW. Chapter 1 Introduction – In general, the contents were reformatted into a single section. Also, a brief discussion of the contents of each chapter was added. Chapter 2 Rainfall – The table identifying design rainfall criteria is eliminated as this information is listed in the Policies and Standards for Maricopa County, Arizona, 2003. Procedures for deter- iv August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Acknowledgements, Comments & Revisions mining the design rainfall criteria were expanded. NOAA Atlas 2 was dropped and NOAA Atlas 14 was officially adopted. The isopluvial figures were moved to Appendix A. Chapter 3 Rational Method – The I-D-F graph was replaced with a new IDF based on NOAA Atlas 14 and then moved to Appendix B. A discussion of the computation of site specific intensities was added and is intended to replace the I-D-F graph. Procedures for determination of peak discharge at multiple points in a drainage network was added. A triangular hydrograph approach was added for combining and translating Rational Method peak discharges. Chapter 4 Rainfall Losses – Procedures for the determination of the rainfall loss variables of the Green and Ampt equation were expanded. Chapter 5 Unit Hydrograph – Procedures for the determination of the Clark unit hydrograph parameters and the S-Graph ordinates were expanded. The Clark unit hydrograph time of concentration procedure for estimating average rainfall excess intensity was revised. Chapter 6 Multiple Frequency Modeling – This is an entirely new chapter. Chapter 7 Channel Routing – The Channel Routing chapter was changed to Chapter 7. The contents of this chapter were reorganized. Chapter 8 Indirect Methods – This is an entirely new chapter. Chapter 9 Application – The Application chapter was changed to Chapter 9. The procedures presented in Chapters 2 through 8 were added. User notes regarding the procedures and application of the methodologies presented in this manual were added along with detailed examples specific to each chapter. Fourth Edition Dates of Revisions The following indicates the dates in which the fourth edition has been updated and summarizes revisions made after the release of this fourth edition. 01/07/2010 Corrected typographical error on page 9-22. 04/24/2013 Corrected typographical errors on Page 9-6. 05/09/2013 Corrected a typographical error on page B-2 08/15/2013 Finalized fourth edition. August 15, 2013 v
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