Design Rainfall Distributions Based on NOAA Atlas 14.

Slides:



Advertisements
Similar presentations
Design Rainfall Distributions Based on NOAA Atlas 14
Advertisements

EXTREME PRECIPITATION Prepared by Lesley Sweeney Environmental Engineer, CT NRCS November, 2012.
Generating Flow Frequencies – Updating NOAA Atlas Precipitation Frequency for California by: John High, Hydrologist Sacramento District Sacramento District.
Unit Hydrograph Reading: Applied Hydrology Sections , 7.5, 7.7,
WinTR-55: Introduction and Background zObjectives: The basics History of WinTR-55 Nuts & bolts of algorithms Demo of model interface.
Reading: Applied Hydrology Sections 14-5, 14-6
Rainfall-Runoff Modeling
Unit Hydrograph The Unit Hydrograph Unit Hydrograph Derivation
Reading: Applied Hydrology Sec 14.1 – 14.4
Design Rainfall Distributions Based on NOAA Atlas 14
Hydrologic Design and Design Storms Venkatesh Merwade, School of Civil Engineering, Purdue University Some slides are taken from Dr. David Maidment, University.
Upper Brushy Creek Flood Study – Flood mapping and management Rainfall depths were derived using USGS SIR , Atlas of Depth Duration Frequency.
Lecture ERS 482/682 (Fall 2002) Rainfall-runoff modeling ERS 482/682 Small Watershed Hydrology.
Synthetic Unit Hydrographs
WinTR-20 Project Formulation Hydrology Computer Program
CE 3372 – Lecture 10. Outline  Hydrology Review  Rational Method  Regression Equations  Hydrographs.
Design Storms in HEC-HMS
6/3/2010 ER FFG Conference An Overview of Gridded Flash Flood Guidance; A Spatially Distributed Runoff and Threshold-Runoff Based Approach Erick Boehmler.
WinTR-20 Project Formulation Hydrology Computer Program Basic Input and Output Presented by: WinTR-20 Development Team.
WinTR-20 Project Formulation Hydrology Computer Program Basic Input and Output Presented by: WinTR-20 Development Team.
WinTR-20 Advanced Features June WinTR-20 Project Formulation Hydrology Computer Program Advanced Features Presented by: WinTR-20 Development Team.
TR-55 Urban Hydrology for Small Watersheds
WinTR-20 SensitivityMarch WinTR-20 Sensitivity to Input Parameters.
Design Rainfall Distributions Based on NOAA Atlas 14 in Maryland.
Precipitation Types Important for Real Time Input and Forecasting
Climatology of Precipitation and Precipitation Extremes in the United States Greg Johnson Applied Climatologist USDA-NRCS National Water and Climate Center.
WinTR-20 Advanced Features March WinTR-20 Project Formulation Hydrology Computer Program Advanced Features Presented by: WinTR-20 Development Team.
SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS 5 Point.
WinTR-20 Project Formulation Hydrology Computer Program Overview Presented by: WinTR-20 Development Team.
Hydrologic Design Storms
WinTR-20 Project Formulation Hydrology Computer Program Overview Presented by: WinTR-20 Development Team.
Finding the S vs. Q relationship By: Cody Hudson.
WinTR-20 PS, SD, FB HydrographsJune WinTR-20 Principal Spillway, Stability Design, and Freeboard Hydrographs Presented by: WinTR-20 Development Team.
Climatology of Precipitation and Precipitation Extremes in the United States Greg Johnson Applied Climatologist USDA-NRCS National Water and Climate Center.
Design Storms CE 365K Hydraulic Engineering Design Spring 2015.
WinTR-20 SensitivityFebruary WinTR-20 Sensitivity to Input Parameters.
1 Import NOAA Atlas Data March 2009 Obtaining NOAA Atlas 14 Rainfall Data and Importing it into WinTR-20.
Model Calibration in MarylandJune Model Calibration in Maryland June 12, 2015.
1 Import NOAA Atlas 14 Data June 2015 Obtaining NOAA Atlas 14 Rainfall Data and Importing it into WinTR-20 Presented by: WinTR-20 Development Team.
CE 3354 Engineering Hydrology
“Storm precipitation analysis in Dallas County” “GIS in Water Resources” by Gonzalo E. Espinoza.
HEC-HMS Simulation Developing a Unit Hydrograph
Hydrologic Calibration: October 2010 U PDATE OF E FFECTIVE H YDROLOGY FOR M ARYS C REEK.
Recent Updates to NOAA/NWS Rainfall Frequency Atlases Geoff Bonnin Hydrometeorological Design Studies Center Office of Hydrologic Development NOAA’s National.
USDA – Natural Resources Conservation Service An Equal Opportunity Provider and Employer USDA - NRCS Implementation of NOAA Atlas 14 Annette Humpal, P.E.
Glenn E. Moglen Department of Civil & Environmental Engineering Virginia Tech Introduction to NRCS/SCS Methods (continued) CEE 5734 – Urban Hydrology and.
Sanitary Engineering Lecture 4
Design Rainfall Distributions Based on NRCC Data.
WinTR-55 Small Watershed Hydrology
Kristina Schneider February 27, 2001
Modified Rational Method
Dan Zarrow Northeast Regional Climate Center Fall 2010
Design Rainfall Distributions Based on NRCC Data
Basic Hydrology: Rainfall-runoff based methods – II
EFH-2 Overview Quan D. Quan Hydraulic Engineer USDA – NRCS – WNTSC
Rainfall Averaging Methods
Modified Rational Method
Guidance on Homework Report Tc and R for each watershed
Using Northeast Regional Climate Center (NRCC) Data with WinTR-20
Using Northeast Regional Climate Center (NRCC) Data with WinTR-55
Hydrology.
Difference between TP-40, TP-49, and HYDRO-35 and NRCC Data
Components of an HEC-HMS Model
Precipitation Analysis
Hydrograph Computation
Hyetographs & Hydrographs
Love Field Modernization Program
Hydrographs River Discharge = cross sectional area X
WinTR-20 Project Formulation Hydrology Using WinTR-20 for Small Watersheds What is Small ?? Some individuals are using WinTR-20 for subdivision planning.
Example Determine the 1- hr unit hydrograph for a watershed using the precipitation pattern and runoff hydrograph below. The abstractions have a constant.
Presentation transcript:

Design Rainfall Distributions Based on NOAA Atlas 14

June 2015 General Considerations Standard NRCS rainfall distributions were developed between 1960 and NRCS is adopting NOAA Atlas 14 in the states where it is applicable. Will a new set of rainfall distributions be required ? If so, how to develop and apply them ? 2

June 2015 Standard Rainfall Distributions 3

June 2015 Geographic Application 4

June 2015 Steps in developing a distribution Determine ratios of x hour / 24 hour rainfall. Place the rainfall ratio for the shortest duration in the center of the distribution. Symmetrically place each larger duration to include the shorter durations. 5

June 2015 Example of a Nested Distribution 3 hr hr 0.7 6

June 2015 NOAA Atlas 14 web site Download rainfall frequency data at: 7

Select State June

Selected Ohio June

Selected Columbus Ohio 10

June 2015 NOAA 14 Rainfall Ratios 11

June 2015 Symmetrical Distribution 12

June 2015 Compare to Type II 13

June 2015 Where Type II and Type III compare with NOAA- derived distribution, 25-yr rainfall Purple: Type II Pink: Type III Green: both White: Neither 14

June 2015 NRCS Rainfall Distribution Regions 15

June 2015 Development of NOAA_A, B, C, and D rainfall distributions Compare to the 60-min / 24-hr ratio for the Type II of 0.45 and Type III of Rainfall DistributionMinimum 60-min / 24-hr ratio Maximum 60-min / 24-hr ratio NOAA_A NOAA_B NOAA_C NOAA_D

June 2015 Compare NOAA_A, B, C, and D rainfall distributions to Type II Drainage Area = 1.0 sq mi. CN = 77 Tc = 0.5 to 2.0 hours Rainfall = 6.0 inches in 24 hours Run Type II, NOAA_A, NOAA_B, NOAA_C, and NOAA_D Run both the standard NRCS and DMV unit hydrographs. 17

June 2015 Compare peak discharges from the rainfall distributions for 484 DUH 18 Tc hoursType IINOAA_ANOAA_BNOAA_CNOAA_D

June 2015 Compare peak discharges from the rainfall distributions for DMV DUH 19 Tc hoursType IINOAA_ANOAA_BNOAA_CNOAA_D

June 2015 Points used to represent Maryland counties and DC 20

June

June

June 2015 Future Directions NOAA Atlas 14 data may be imported easily into WinTR-20 Version Use GIS data layers to derive site-specific and regional rainfall distributions for hydrologic modeling. 23

June

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.