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

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Drainage Design Manual for Maricopa County Hydrology: Introduction Chapter 6 Multiple Storm Frequency Modeling - Runoff hydrographs for the 2-, 5- and 10-year events are to be estimated by the application of ratios to the 100-year runoff hydrograph. Specific ratios for the 2-, 5- and 10-year events are provided in this chapter. Chapter 7 Channel Routing - General guidance is provided for the use of Normal-Depth routing, Kinematic Wave routing, Muskingum routing and Muskingum-Cunge routing. Normal-Depth routing is the preferred approach and can be applied to both natural and artificial channels. Kinematic Wave routing can be applied to urbanized or artificial channels and closed conduits. Muskingum routing can be used for large natural channels where parameter calibration data exists. Muskingum-Cunge routing may be used in all other cases. Chapter 8 Indirect Methods - Three methods for verification of peak discharge estimations are provided in this chapter. The three methods incorporate local and regional data for comparison as well as generalized, regional regression equations. Chapter 9 Application - General guidelines and some specific aids in the use of the manual as well as detailed examples specific to each chapter are provided. Chapter 10 References - A listing of all references is provided. Appendices - Isopluvial maps, loss rate tables for soils in Maricopa County, Textural Class Diagram, selected blank figures, worksheets, and other supporting information are provided in Appendices A through D. 1.2 PURPOSE In April 1985 a task force was formed by the Flood Control District of Maricopa County to establish a common basis for drainage management in all jurisdictions within Maricopa County. Among the goals of the task force were provisions for consistent analysis of drainage requirements, reducing costs and staff time for both the County and municipalities when annexing County areas, and supplying equal and common protection from the hazards of stormwater drainage for all County residents. Additionally, developers would be benefited by having only one set of drainage standards with which to comply when developing land within the incorporated or unincorporated areas of Maricopa County. The task force determined that these efforts would be achieved in three phases: • Phase 1 Research, evaluate, develop, and produce uniform criteria for drainage of new development which resulted in the Uniform Drainage Policies and Standards for Maricopa County, Arizona (herein referred to as the Policies and Standards Manual.) • Phase 2 Establish a Drainage Design Manual for use by all jurisdictional agencies within the County. 1-4 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Introduction • Phase 3 Prepare an in-depth evaluation of regional rainfall data and establish precipitation design rainfall guidelines and isohyetal maps for Maricopa County. As a part of Phase 2, the Drainage Design Manual for Maricopa County, Volume I, Hydrology, will provide the necessary data for Volume II, Hydraulics. 1.3 SCOPE AND LIMITATION When using the procedures detailed in this manual, it is important to keep three limitations in mind. First, this is a hydrologic design manual. The methods, techniques and parameter values described herein are not necessarily valid for real-time prediction of flow values, nor for recreating historic events – although some of the methods are physically based and would be amenable for uses other than design hydrology. Second, the lack of runoff data for urbanizing areas of the County, for the most part, precludes the use of flood-frequency analysis for stormwater drainage design. For those watercourses with sufficient record, flood-frequency analysis may be acceptable. Similarly, for those watercourses with established regulatory floodplains, the FEMA-accepted flood-frequency curves may be used for design purposes, unless they are proven inappropriate. The purpose of this manual is to provide a means of assisting in the prediction of runoff that might result from a design storm of a given return interval. Third, the typical design storm normally has no point of reference in terms of a singular historic event. Rather, it intends to provide the best available information by utilizing historic data as well as other precipitation design concepts. The design storm provides not only the peak intensities that would be expected from a storm of a given duration and return interval, but also the volumes associated with it. The tables describing the temporal distribution of the design storm for use in a hydrologic model, i.e., HEC-1, are approximately equivalent to the graphs used to determine the rainfall intensity to be used in the Rational Method. The net effect is that regardless of the size of the area being investigated or the method of analysis, the same design storm is used as the driving input. August 15, 2013 1-5
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