Proposed Hydraulic Design Manual Updates
Proposed Hydraulic Design Manual Updates
Ab Maamar-Tayeb, P.E. Hydrology and Hydraulics Section
Short Course Hydraulics Session
OctOocbteorb1er41, 240, 2020
Agenda
Hydraulic Design Manual Updates
Chapter 4 Hydrology (Updates)
? Update to NOAA Atlas 14 rainfall data guidelines. ? Update on Rainfall Temporal Distribution based on
NRCS guidance. ? Peak Rate Factor (PRF) guidance based RTI Research. ? Statistical Analysis of Stream Gage Data based on RTI
Research.
Chapter 2 and Chapter 13 (Updates)
? Drainage Policy and Storm Water Management ? Developers Outfall Policy and Detention
Chapter 16 (New Chapter)
? 1D and 2D Unsteady Analysis
Short Course Hydraulics Session
October 14, 2020
2
Updates: Chapter 4 - Hydrology
Chapter 4 Updates:
? Four Updates Topics
? NOAA Atlas 14 ? Rainfall Distribution Guidance ? Peak Rate Factor ? Statistical Gage Analysis Generalized
Skew Update
Short Course Hydraulics Session
October 14, 2020
3
Updates: Chapter 4 - Hydrology
Chapter 4 Updates: NOAA Atlas 14
? Rainfall data updated with the publication of NOAA Atlas 14 in 2018 ? Considered best available data. ? All projects must use NOAA Atlas 14 Data.
Two Sources for NOAA Atlas 14 Data
NOAA's National Weather Service Website ? "NOAA Atlas 14 Point Precipitation Frequency Estimates" :
EBD Lookup Spreadsheet (EBDLKUP2019) completed by RTI project 0-6980 ? Provides intensities for Rational Method input (not depths)
Short Course Hydraulics Session
October 14, 2020
4
Updates: Chapter 4 ? Hydrology ? Atlas 14 Rainfall Data
Chapter 4 Updates: NOAA's National Weather Service Website ? "NOAA Atlas 14 Point Precipitation Frequency Estimates" :
Short Course Hydraulics Session
October 14, 2020
5
Updates: Chapter 4 ? Hydrology ? Atlas 14 Rainfall Data
Created e,b,d spreadsheet
? EBDLKUP-2019-vC6.2.10.xslm (replaces EBDLKUP-2015)
? New e, b, d coefficients determined for intensity, duration, frequency (IDF) curves
? Allows for partial duration or annual maximum series.
? Developed sub-county rainfall zones due to rainfall variation across some counties. 500 zones total based on spatial error of 20, 15 and 10 percent
? Includes KMZ google earth map file
Compiled new IDF curves in library
? Library integrated with Bentley OpenRoads Designer
Short Course Hydraulics Session
October 14, 2020
6
Updates: Chapter 4 ? Hydrology ? Rainfall Distribution
? Rainfall temporal distribution
? NRCS states Type II-III storms out of date ? NRCS Type II-III storms not included in
HEC-HMS 4.3 ? New recommended method: Balanced
Storm Methods (Frequency storm ? HECHMS) ? Storm Peak at 67 percent of Duration
Short Course Hydraulics Session
October 14, 2020
7
Updates: Chapter 4 ? Hydrology ? Peak Rate Factor
Peak Rate Factor (PRF) guidance
? Peak Rate Factor is parameter that defines the shape of the hydrograph
? Suggests consideration of PRF values other than the default value of 484 ? Possible range: 100-600
? PRF selection will be based on slope and basin area.
? RTI Research Project 7010
Short Course Hydraulics Session
October 14, 2020
8
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