WinTR-20 Project Formulation Hydrology Using WinTR-20 for Small Watersheds What is Small ?? Some individuals are using WinTR-20 for subdivision planning.

Slides:



Advertisements
Similar presentations
Hydrology Rainfall - Runoff Modeling (I)
Advertisements

Hydrology Model Basic Tutorial
Hydrologic Analysis Dr. Bedient CEVE 101 Fall 2013.
Unit Hydrograph Reading: Applied Hydrology Sections , 7.5, 7.7,
CHARACTERISTICS OF RUNOFF
Rainfall-Runoff Modeling
WinTR-20 Computation Differences March WinTR-20 Project Formulation Hydrology Computer Program Will TR-20 and WinTR-20 give the same results ??
Hyetographs & Hydrographs
Unit Hydrograph Reading: Sections , 7.5, 7.7,
Ch  Know how to determine peak flow using the rational method 2.
Chapter Two Net Storm Rainfall. Hydrograph Vocabulary Rising limb, a falling limb, and a recession. The rising limb and falling limb are separated by.
Lecture ERS 482/682 (Fall 2002) Rainfall-runoff modeling ERS 482/682 Small Watershed Hydrology.
WinTR-20 Project Formulation Hydrology Program to
WinTR-20 Project Formulation Hydrology Computer Program
CE 3372 – Lecture 10. Outline  Hydrology Review  Rational Method  Regression Equations  Hydrographs.
Hydrographs and Drainage Basins. Drainage Basins: A drainage basin is the catchment area of a river and its tributaries. The boundary of the catchment.
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.
WinTR-20 Advanced Features March WinTR-20 Project Formulation Hydrology Computer Program Advanced Features Presented by: WinTR-20 Development Team.
Urban Storm Drain Design: Rainfall-Runoff relations.
SITES SOFTWARE APPLICATION SEMINAR __________________________ SITES INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS 5 Point.
WinTR-20 Data Converter May WinTR-20 Project Formulation Hydrology Converting Old TR-20 Input Files to New WinTR-20 Format Presented by: WinTR-20.
WinTR-20 Project Formulation Hydrology Computer Program Overview Presented by: WinTR-20 Development Team.
__________________________ SITES INTEGRATED DEVELOPMENT ENVIRONMENT for WATER RESOURCE SITE ANALYSIS COMPLEX WATERSHEDS SITES IN SERIES.
WinTR-20 Project Formulation Hydrology Computer Program Overview Presented by: WinTR-20 Development Team.
Flash flood forecasting in Slovakia Michal Hazlinger Slovak Hydrometeorological Institute Ljubljana
WinTR-20 PS, SD, FB HydrographsJune WinTR-20 Principal Spillway, Stability Design, and Freeboard Hydrographs Presented by: WinTR-20 Development Team.
WinTR-20 SensitivityFebruary WinTR-20 Sensitivity to Input Parameters.
STORMWATER MANAGEMENT
Model Calibration in MarylandJune Model Calibration in Maryland June 12, 2015.
L-THIA in ArcGIS L-THIA in Python project July 2010 Larry Theller
1 TR-55 Urban Hydrology for Small Watersheds. 2 Simplified methods for estimating runoff and peak discharge for small urban/urbanizing watersheds Ch 1.
Design Rainfall Distributions Based on NOAA Atlas 14.
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
Modeling an Urban Development with MIKE-SWMM Presented by: Melissa Figurski.
BUILDING AND RUNNING THE HYDROLOGICAL MODEL
HYDROLOGY Lecture 10 Unit Hydrograph
WinTR-20 Project Formulation Hydrology Computer Program
Rainfall-Runoff modeling
WinTR-55 Small Watershed Hydrology
EFH-2 Engineering Handbook Chapter 2
Kristina Schneider February 27, 2001
Modified Rational Method
HEC-HMS Simulation Adding a detention pond at the outlet
Hydrologic Analysis (Bedient chapter 2)
S Curves From Mays, 2011, Ground and Surface Water Hydrology.
TR-55 Urban Hydrology for Small Watersheds
Basic Hydrology: Rainfall-runoff based methods – II
EFH-2 Overview Quan D. Quan Hydraulic Engineer USDA – NRCS – WNTSC
The Drainage Basin System
Modified Rational Method
Using Northeast Regional Climate Center (NRCC) Data with WinTR-20
Using Northeast Regional Climate Center (NRCC) Data with WinTR-55
المنحنى الزمني للتدفق في المجاري الطبيعية Stream Flow Hydrograph
Highway Drainage: Determining Flow Rates
Hydrograph Computation
Hyetographs & Hydrographs
Find: Qp [cfs] tc Area C [acre] [min] Area Area B A
Find: Qp [cfs] shed area tc C 1,050 1,200 1,300 1,450 A B C Q [acre]
Preciptation.
Preciptation.
Presentation transcript:

WinTR-20 Project Formulation Hydrology Using WinTR-20 for Small Watersheds What is Small ?? Some individuals are using WinTR-20 for subdivision planning. It can be done, but with caution. This presentation shows how to set minimum hydrograph values and time increments to provide valid results for small drainage areas. TR-20 (DOS version) had severe limitations with this type of application, whereas WinTR-20 does not have those limitations. Presented by: WinTR-20 Development Team WinTR-20 for small watersheds March 2009 WinTR-20 for small watersheds March 2009

What is small? The smallest Sub-area less than 0.02 square mile (12.8 acres) Tc equal to or less than 0.1 hour WinTR-20 for small watersheds March 2009

Minimum discharge and time step The minimum practical discharge is 0.001 cfs. A minimum discharge of less than 0.001 cfs will cause the output to be in exponential units (such as 0.245E-03). It is difficult to read, but nevertheless computationally valid. WinTR-20 for small watersheds March 2009 WinTR-20 for small watersheds March 2009

Small Watershed Example WinTR-20 for small watersheds March 2009

Storm Analysis Data WinTR-20 for small watersheds March 2009

Set Global Output Options To provide the maximum precision of WinTR-20 results, select Hydrograph Print Precision as 3. Enter a Minimum Hydrograph Display flow of 0.001 (3 decimal places). Note that this is same as the Minimum Hydrograph Value. Leave the Print Time Increment blank. This will cause the hydrograph to be printed at the internal time increment of 6 percent of the time of concentration. Peak and Hydrograph Output codes may be set for Sub-Areas and Reaches individually or as Global selections. WinTR-20 for small watersheds March 2009 WinTR-20 for small watersheds March 2009

WinTR-20 runoff volume WinTR-20 sums the hydrograph points to get runoff volume. For this example, with CN = 77, rainfall of 5.0 inches, runoff should be 2.62 inches. With a high minimum hydrograph cutoff value, the summing of hydrograph points does not include the beginning and ending hydrograph tails, thus underestimating the runoff volume. WinTR-20 for small watersheds March 2009 WinTR-20 for small watersheds March 2009

WinTR-20 Output Runoff Amount is 2.623 inches. With a higher minimum discharge, the beginning and ending tails would be cut off. Runoff volume would be less than the correct value. Also of interest is the internal time increment. In this example, it is 0.006 hour or 6 percent of the Tc. WinTR-20 for small watersheds March 2009 WinTR-20 for small watersheds March 2009

WinTR-20 Rainfall Tables The Type II storm used in this example has a time interval of 0.1 hour. For Tc’s less than 0.1 hour, the peak discharge does not increase much because rainfall intensity is already at a maximum. The small increase of peak discharge is caused by the steepening of the unit hydrograph. WinTR-20 for small watersheds March 2009

WinTR-20 for small watersheds Data for this example are in the WinTR20_training_MD\workshops\starting data_files\ directory. File name: small_drainage_area.inp WinTR-20 for small watersheds March 2009

The End WinTR-20 for small watersheds March 2009

WinTR-20 for small watersheds March 2009