Section 2: Hydrology. Introduction. What is the Return Period? Intensity-Duration-Frequency Data. Generating a runoff hydrograph 85 Minutes

Size: px
Start display at page:

Download "Section 2: Hydrology. Introduction. What is the Return Period? Intensity-Duration-Frequency Data. Generating a runoff hydrograph 85 Minutes"

Transcription

1 Section 2: Hydrology Generating a runoff hydrograph 85 Minutes Press Space, PageDown, or Click to advance. Press PageUp to reverse. Esc to exit. Right-Click for other options. Copyright 2004 HydroCAD Software Solutions LLC All Rights Reserved - Duplication Prohibited Introduction What are we going to discuss? PWe will start with a review of some fundamental hydrologic techniques. PA basic understanding of these calculations will improve your ability to understand and interpret the results from any hydrology software. PPlease see other texts for full details, such as the HydroCAD Owner s Manual What is the Return Period? A common point of confusion! P Roughly speaking, the return period is the average time between occurrences of a given event, such as the 25-year storm. P To be more precise, a 25-year storm has a 4% probability of occurring in any given year. P Therefore, a 25-year storm can occur in two consecutive years! Intensity-Duration-Frequency Data A basic way to quantify rainfall observations. Typically compiled for each county in the US Frequency (years) Rainfall Duration (minutes) P An IDF curve indicates the rainfall intensity that will occur for a given duration and return period. P The rainfall intensity remains constant for the entire duration Typical IDF Curves 2-040

2 The Rational Method A basic equation for predicting peak runoff Q ' CIA PQ=Peak Runoff [CFS] PC=Runoff Coefficient Pi=Rainfall intensity PA=Catchment Area < The intensity is determined from the IDF curve, but what duration do we use? Setting the Rainfall Duration for the Rational Method A simple equation gets more complicated! P We must use the critical duration, which produces the highest runoff. P For a single, homogeneous subcatchment, the duration is typically equal to the time-ofconcentration, Tc. P But when several subcatchments are combined, the critical duration can be any value between the shortest and longest Tc Other Limitations of the Rational Method The SCS Rainfall Distributions Allowing the rainfall intensity to vary over time PThe Rational Method predicts peak runoff, but not total runoff volume. PThe Rational Method predicts a constant flow, rather than generating a complete hydrograph. PRational Method is poorly suited for volumesensitive calculations, such as detention ponds. < How do we overcome these limitations??? P A mass curve indicates the cumulative rainfall depth at any time during the storm

3 Features of Rainfall Distributions More Rainfall Distribution Features P Allows the intensity to vary over time. < Similar to an actual rainfall event P Includes rainfall volume of entire (24-hour) event. < Can be used for volume-sensitive calculations. P Each curve includes all events up to 24-hours. < Eliminates need to identify the critical duration! P Represents most of the US with just a few curves. < Curve is scaled for your local 24-hour rainfall depth. P Synthetic rainfalls provide design standards < Type II peak defined at 12 hours P Can also create an actual rainfall distribution < Allows modeling of observed events The SCS Runoff Equation How much of the precipitation appears as runoff? 2 (P&.2 S) Q ' (Q=0 if P<.2S ) P %.8S where S ' 1000 & 10 CN PQ=Precipitation excess (runoff) [inches or mm] PP=Cumulative precipitation [inches or mm] PS=Potential maximum retention [inches] PCN=SCS Curve Number Time-of-Concentration: What does it mean? Determining when the runoff occurs P The Tc is the time required for a particle of water to travel from the most hydrologically remote point in the watershed to the point of collection. P There are many procedures for calculating Tc < TR-55 Sheet Flow < TR-55 Shallow Concentrated Flow < Channel Flow (based on Manning s velocity) < Upland Method < CN Method (a.k.a. Lag Method) We ll examine the individual procedures in the next section 2-120

4 The SCS Dimensionless Unit Hydrograph Defines the runoff hydrograph for a single burst Unit Hydrograph Time Axis How long does the runoff last from a single burst? T p ' 5D and T p ' 2 3 T c ˆ D ' T c 7.5 < Tp=Time to peak < D=Burst duration < Tc=Time of concentration P Everything is based on the Tc UH Time Axis Example Just substitute the Tc! 0 If Tc = 30 minutes D = Tc/7.5 = 4 minutes Tp = 5D = 20 minutes Tb = 5Tp = 100 minutes Time (minutes) Unit Hydrograph Flow Axis What is the peak runoff from a single burst? q p ' C K A Q ' 484 A Q ' 484 A Q T p T 2 p T 3 c Pq p =Peak discharge [CFS] PC=Units conversion factor (653.33) PK=UH Shape Factor (0.75 for SCS UH) P484=SCS UH Peak Factor PA=Area [sq-miles] PQ=Precipitation Excess (runoff) [inches] 2-160

5 UH Flow Axis Example A Fully Dimensioned UH! Determine the flow for a single burst, with precipitation excess Q If Q= 0.2 inch and A = 0.1 sq-mile and Tc = 0.5 hours q p = 484 A Q / 2/3Tc = 29 cfs The actual runoff hydrograph from a single burst of rainfall PNow we have a complete hydrograph for one burst. PBut how do we get the hydrograph for an entire 24-hour storm? Time (minutes) Time (minutes) Convolution: The Heart of TR-20 Constructing the entire runoff hydrograph P The unit hydrograph (when dimensioned) tells us the runoff for a single burst of rainfall. P To determine the runoff for the entire storm, we must perform a convolution of the unit hydrograph with the precipitation excess. < We must break the storm into a sequence of individual bursts, and add up the hydrographs from all the bursts. Convolution: Step #1 Adding up the hydrographs for each burst 1) Divide storm into bursts D

6 Convolution: Step #2 Adding up the hydrographs for each burst Convolution: Step #3 Adding up the hydrographs for each burst Total Hydrograph 3) Add all UH 1) Divide storm into bursts D 2) Generate UH for each burst 1) Divide storm into bursts D 2) Generate UH for each burst Complete Runoff Hydrograph Why does the hydrograph look like this? Performing the Convolution A computation-intensive process 2) Runoff peaks after rainfall peak 1) Zero runoff for several hours 3) Runoff continues after end of storm P If Tc = 7.5 minutes < Then burst duration D = 1 minute < And 24-hour storm contains 1440 bursts P If UH consists of 100 coordinates < 1440 x 100 = 144,000 coordinates must be calculated and summed to generate the runoff hydrograph!! P Calculation is not feasible by hand!

7 TR-55 and the Tabular Method TR-55 Warnings Doing runoff calculations by hand Quoting from the TR-55 manual P The TR-55 Tabular method allows manual calculation of a runoff hydrograph that approximates the TR-20 UH procedure. P TR-55 tables were produced by TR-20 with: < Curve Number = 75 < Runoff = 3 inches < Fixed Tc values from 0.1 hours to 2.0 hours P Other values require approximation and results will differ from actual TR-20 results P This method (TR-55) approximates TR-20, a more detailed hydrograph procedure... Use TR-20 if the watershed is very complex or a higher degree of accuracy is required. P The procedure (TR-55) should not be used to perform final design if an error in storage of 25 percent cannot be tolerated... More detailed hydrograph development and routing will often pay for itself through reduced construction costs HydroCAD: An Easier TRS20 Solution Plus lots of other calculations and capabilities P In 1986, HydroCAD was the first PC-based program to use the full UH runoff procedure. P Eliminates approximations in the tabular method. P Also provides: < TR-55 Tc procedures < Hydraulics calculations < True hydrograph routing < Lots more! (As we ll see throughout the day) P But first, let s examine some basic concepts in more detail What is a hydrograph? The flow of water over time (Flow vs. Time) T i m e A hydrograph is ideally a smooth curve

8 But how do we represent the hydrograph curve numerically? Use a series of points spaced equally in time What is the peak flow? HydroCAD uses an interpolated peak, just like TR-20 P True peak may fall between points... P So interpolate using three highest points T i m e The time increment is called dt T i m e Allows for variations in point timing What time increment should I use? The time increment (dt) specifies the point spacing P For best results, use dt # Tc / 2 < This ensures good peak definition P If Tc $ 0.1 hours (6 minutes), use dt = 0.05 hours < This is the default value for new projects P A warning will occur if dt is too large < This will occur if Tc < 0.1 hours P Dt can be as small at 0.01 hours < For fastest operation, don t go smaller than required What time span should I use? Long enough to cover all flow of interest! Default time span 5-20 hours Use longer span if entire volume is required! T i m e (hours) 2-320

9 Rational Method hydrographs Time for a quick stretch! A shorter time span and time increment are required Default dt = 0.01 hours P Please have a quick stretch at your desk P We ll have a full break after this section 0 Tc D D+Tc D+2Tc Default time span = 0-3 hours Rainfall Curves #1 Different ways to define the rainfall distribution Rainfall Curves #2 Different ways to define the rainfall distribution True Rainfall Mass Curve P The actual rainfall distribution is a curve P How do we represent this in HydroCAD? Fitted Mass Curve P Uses a polynomial fit to each segment for a true curve P Used for standard SCS rainfalls P For details see Start Programs HydroCAD Rainfall Info

10 Rainfall Curves #3 Different ways to define the rainfall distribution Rainfall Curves #4 Different ways to define the rainfall distribution Mass curve points P Easy to define P Line segments may cause runoff steps Intensity curve points P Easy to define P Gives smooth runoff curve P Smoothing option gives better curve Sample Mass Curve File Sample Intensity Curve File This is all you need to create a custom mass curve This is all you need to create a custom curve timeunits=hours duration=1 1-hour duration timeunits=hours duration=1 1-hour duration depthunits=inches stormdepth= inch depth depthunits=inches stormdepth= inch depth depth= depth= Mass-curve points For full details see HydroCAD Sample B file inten= Inten= Intensity-curve points For full details see HydroCAD Sample A file 2-400

11 Changing the Storm Duration HydroCAD can rescale a storm to any duration Tc Effects #1 How does the Tc effect the runoff hydrograph? Rescaled 12-hour storm Original 24-hour storm P Storm duration can be changed < But beware of change in peak P Different rainfall distribution may be required! P If Tc=0, runoff is immediate! < HydroCAD will accept Tc=0 P Hydrograph has same timing as rainfall distribution < Peak runoff occurs at same time as peak rainfall Tc Effects #2 How does the Tc effect the runoff hydrograph? PAs the Tc increases: < Unit Hydrograph is extended < Runoff occurs later Curve Number Effects How does the CN effect the runoff? PLow CN values decrease the runoff volume < Runoff timing is not directly effected by CN PHigh CN values increase the runoff volume < If CN=100 all precipitation will appear as runoff: Maximum Potential Retention = S ' 1000 & 10 ' 0 CN No Retention! SCS Runoff Volume = Q' (P&.2 S)2 P P %.8S ' All precip is runoff! 2-440

12 Rainfall on the surface of a pond How do we include this precipitation in the model? P Include pond surface area in an adjacent subcatchment. < OK for small pond areas P Or, model as separate subcat with: < Tc=0 < CN=100 < Produces Runoff equal to rainfall Adding Hydrographs What happens when multiple hydrographs are combined? 7 Combined Flow 7 Inflow #2 7 Inflow #1 P Peak flows add directly only if they occur at the same time! P Volumes must always add-up T i m e Software Exercises Exploring these topics in HydroCAD P Before we begin the software demonstration, are there any other questions about runoff calculations? P If you wish, you may perform the following exercises yourself, or just watch the demo. Are You Ready? Before we begin the exercises... P Is your computer logged-in? < The windows desktop should be visible P Can you locate the HydroCAD shortcut? < HydroCAD icon should be on the desktop < Otherwise look in Start Programs HydroCAD P Does anyone need help?

13 Subcatchment Setup #1 Prepare a subcatchment to receive our sample data P Getting ready < Start HydroCAD < Open the TR-20 Sample Project P Create a subcatchment: < Drag a subcat from the palette P Edit the subcatchment < Double-click the node -or- < Right-click and select Edit from the menu Subcatchment Setup #2 Enter some sample data P Enter a couple of sub-areas & curve numbers: < Click the Area tab < Enter an area and a CN value directly For example: Area=10 acres, CN=75 < Enter a second area and lookup the CN value To open the lookup table, double-click the line Select the desired CN value from the table P A few notes about data entry tables < Right-click any table for options < Drag first column to change order of rows Subcatchment Setup #3 Enter some sample data PEnter some Tc values: < Click the Tc tab < Do a direct Tc entry Double-click a blank line Select Direct Entry Enter a TC value of 20 minutes Click OK to save the TC data PWe ll examine the other Tc options later Subcatchment Setup #4 View the results! P Click OK to save the subcat data P Open a report window: < Double-click any described node -or- < Right-click and select report

14 Subcatchment Setup #5 View the results! P Explore the report tabs: < Hydrograph Tabular view Note maximum values in bold Click Shrink to see more points < Summary Use summary to review results and input data Click any line for help (new 7.1 feature) Rainfall Settings #1 Global settings for the current project P Review the calculation settings < Click the Calculator icon Note: You can leave any report windows open! P Runoff methods < TR-20 / SCS UH < SBUH < Rational P (We ll return to the routing options later) Rainfall Settings #2 Global settings for the current project P Rainfall data < Rainfall distribution & depth < Antecedent moisture condition < Rainfall duration < Back-to-back storms P Rainfall events < Define events as desired < -or- import events from another project P For Rational Method: < Can define Custom IDF curves Rainfall Settings #3 Global settings for the current project P Time Span & Time Increment < Adjustable in response to any warning messages < Fast Hydrograph Plots generally recommended Improves plot speed and appearance Does not affect accuracy of calculations P Unit Hydrograph selection < Changing the Peak Factor

15 Rainfall Settings #4 Global settings for the current project Rainfall Settings #5 Global settings for the current project P Advanced Parameters < Initial Abstraction ratio < Used with new modeling techniques < (New feature added in version 7.1) P Automatic pipe & culvert sizing < Lots of options to explore on your own < Remember: Click HELP for more information P Click OK to close the calculation settings < Repots are updated for new settings! *** End of Section *** P Before we move on, are there any other questions about subcatchments? P If you performed the exercises, you may close HydroCAD at this time. < You do NOT need to save your changes. P We will continue after a SHORT BREAK 2-590

Engineering Hydrology Class 3

Engineering Hydrology Class 3 Engineering Hydrology Class 3 Topics and Goals: I.Develop s (estimate precipitation) II.Develop simple constant intensity design storm III.Develop SCS design storm Ocean s Why do we want to derive the?

More information

NRCS Hydrology methodology review Minnesota NRCS recommendation MnDOT recommendation Using Atlas 14 with HydroCAD

NRCS Hydrology methodology review Minnesota NRCS recommendation MnDOT recommendation Using Atlas 14 with HydroCAD Dec, 2015 NRCS Hydrology methodology review Minnesota NRCS recommendation MnDOT recommendation Using Atlas 14 with HydroCAD NRCS - Natural Resource Conservation Service (formerly known as SCS Soil Conservation

More information

Summary of Detention Pond Calculation Canyon Estates American Canyon, California

Summary of Detention Pond Calculation Canyon Estates American Canyon, California July 15, 2015 Bellecci & Associates, Inc Summary of Detention Pond Calculation Canyon Estates American Canyon, California 1. Methodology: Method: Unit Hydrograph Software: Bentley Pond Pack Version 8i

More information

Software Applications for Runoff Hydrological Assessment

Software Applications for Runoff Hydrological Assessment Bulletin UASVM Horticulture, 67(2)/2010 Print ISSN 1843-5254; Electronic ISSN 1843-5394 Software Applications for Runoff Hydrological Assessment Severin CAZANESCU 1), Sorin CIMPEANU 1), Oana GUI 2), Dana

More information

5/11/2007. WinTR-55 for Plan Reviews Small Watershed Hydrology Overview

5/11/2007. WinTR-55 for Plan Reviews Small Watershed Hydrology Overview WinTR-55 for Plan Reviews Small Watershed Hydrology Overview 1 Overview Course Outline Historical Background Program Description Model Capabilities and Limitations This is the Overview portion of the training.

More information

Peak discharge computation

Peak discharge computation Ia/P 4 Peak Dischage Method Graphical Peak Discharge Method This chapter presents the Graphical Peak Discharge method for computing peak discharge from rural and urban areas. The Graphical method was developed

More information

Drainage Analysis. Appendix E

Drainage Analysis. Appendix E Drainage Analysis Appendix E The existing and proposed storm drainage systems have been modeled with Bentley CivilStorm V8 computer modeling software. The peak stormwater discharge was determined for

More information

Engineering Hydrology. Class 16: Direct Runoff (DRO) and Unit Hydrographs

Engineering Hydrology. Class 16: Direct Runoff (DRO) and Unit Hydrographs Engineering Hydrology Class 16: and s Topics and Goals: 1. Calculate volume of DRO from a hydrograph; 2. Complete all steps to develop a. Class 14: s? HG? Develop Ocean Class 14: s? HG? Develop Timing

More information

APPENDIX K OPERATIONS AND FINAL COVER SURFACE WATER MANAGEMENT SYSTEM DESIGN

APPENDIX K OPERATIONS AND FINAL COVER SURFACE WATER MANAGEMENT SYSTEM DESIGN ONONDAGA LAKE SEDIMENT CONSOLIDATION AREA CIVIL & GEOTECHNICAL FINAL DESIGN APPENDIX K OPERATIONS AND FINAL COVER SURFACE WATER MANAGEMENT SYSTEM DESIGN PARSONS P:\Honeywell -SYR\44483 - Lake Detail Design\9

More information

Example 3. Elementary HEC-HMS Model. Purpose. Illustrate the steps to create a functioning precipitation-runoff model in HEC-HMS.

Example 3. Elementary HEC-HMS Model. Purpose. Illustrate the steps to create a functioning precipitation-runoff model in HEC-HMS. Example 3 Elementary HEC-HMS Model Purpose Illustrate the steps to create a functioning precipitation-runoff model in HEC-HMS. The example is elementary in the sense that only a small set of HEC-HMS capabilities

More information

DETENTION BASIN DESIGN USING RATIONAL HYDROGRAPHS

DETENTION BASIN DESIGN USING RATIONAL HYDROGRAPHS DETENTION BASIN DESIGN USING RATIONAL HYDROGRAPHS By Thomas F. Smith, P.E., P.L.S. Bercek and Smith Engineering, Inc. www.bercekandsmith.com tfsmith2@bercekandsmith.com 1 Topics Covered: 2 1 Attributed

More information

APPENDIX IV. APPROVED METHODS FOR QUANTIFYING HYDROLOGIC CONDITIONS OF CONCERN (NORTH ORANGE COUNTY)

APPENDIX IV. APPROVED METHODS FOR QUANTIFYING HYDROLOGIC CONDITIONS OF CONCERN (NORTH ORANGE COUNTY) APPENDIX IV. APPROVED METHODS FOR QUANTIFYING HYDROLOGIC CONDITIONS OF CONCERN (NORTH ORANGE COUNTY) Hydromodification design criteria for the North Orange County permit area are based on the 2- yr, 24-hr

More information

ENGN.4010 ENGINEERING CAPSTONE DESIGN Watershed Analysis. CiA

ENGN.4010 ENGINEERING CAPSTONE DESIGN Watershed Analysis. CiA RATIONAL METHOD Q CiA Where: Q = Maximum Rate of Runoff (cfs) C = Runoff Coefficient i = Average Rainfall Intensity (in/hr) A = Drainage Area (in acres) RATIONAL METHOD Assumptions and Limitations: Watershed

More information

Learning objectives. Upon successful completion of this lecture, the participants will be able to describe:

Learning objectives. Upon successful completion of this lecture, the participants will be able to describe: Solomon Seyoum Learning objectives Upon successful completion of this lecture, the participants will be able to describe: The different approaches for estimating peak runoff for urban drainage network

More information

5/11/2007. WinTR-55 for Plan Reviewers Small Watershed Hydrology Intermediate WinTR-55 Training Modeling Multiple Sub-area Watersheds

5/11/2007. WinTR-55 for Plan Reviewers Small Watershed Hydrology Intermediate WinTR-55 Training Modeling Multiple Sub-area Watersheds WinTR-55 for Plan Reviewers Small Watershed Hydrology Intermediate WinTR-55 Training Modeling Multiple Sub-area Watersheds 1 Course Outline Overview Review of Hydrology Terms Modeling Single Sub-area Watersheds

More information

Basic Hydrology Runoff Curve Numbers

Basic Hydrology Runoff Curve Numbers Basic Hydrology Runoff Curve Numbers By: Paul Schiariti, P.E., CPESC Mercer County Soil Conservation District The SCS Runoff Curve Number The RCN (Runoff Curve Number) method was originally established

More information

Module 3. Lecture 6: Synthetic unit hydrograph

Module 3. Lecture 6: Synthetic unit hydrograph Lecture 6: Synthetic unit hydrograph Synthetic Unit Hydrograph In India, only a small number of streams are gauged (i.e., stream flows due to single and multiple storms, are measured) There are many drainage

More information

WinTR-55 Small Watershed Hydrology

WinTR-55 Small Watershed Hydrology WinTR-55 Small Watershed Hydrology Intermediate WinTR-55 Training Modeling Watersheds with Structures SEE NOTES AT CLASS EXERCISE #4. 1 Course Outline Overview Review of Hydrology Terms Modeling Single

More information

Dynamic Analysis - SWMM

Dynamic Analysis - SWMM Practice Workbook This workbook is designed for use in Live instructor-led training and for OnDemand self-study. OnDemand videos for this course are available through CONNECT Advisor and on the Bentley

More information

FAST WATER / SLOW WATER AN EVALUATION OF ESTIMATING TIME FOR STORMWATER RUNOFF

FAST WATER / SLOW WATER AN EVALUATION OF ESTIMATING TIME FOR STORMWATER RUNOFF FAST WATER / SLOW WATER AN EVALUATION OF ESTIMATING TIME FOR STORMWATER RUNOFF Factors Affecting Stormwater Runoff: Rainfall intensity % Impervious surfaces Watershed size Slope Soil type, soil compaction

More information

Runoff Hydrographs. The Unit Hydrograph Approach

Runoff Hydrographs. The Unit Hydrograph Approach Runoff Hydrographs The Unit Hydrograph Approach Announcements HW#6 assigned Storm Water Hydrographs Graphically represent runoff rates vs. time Peak runoff rates Volume of runoff Measured hydrographs are

More information

Rational Method Hydrological Calculations with Excel COURSE CONTENT

Rational Method Hydrological Calculations with Excel COURSE CONTENT Rational Method Hydrological Calculations with Excel Harlan H. Bengtson, PhD, P.E. COURSE CONTENT 1. Introduction Calculation of peak storm water runoff rate from a drainage area is often done with the

More information

Inflow Design Flood Control System Plan

Inflow Design Flood Control System Plan Inflow Design Flood Control System Plan Scrubber Ponds Lewis and Clark Station Prepared for Montana-Dakota Utilities Co. October 2016 Paul T. Swenson 2016.10.14 17:54:29-05'00' 234 West Century Avenue

More information

Chapter H. Introduction to Surface Water Hydrology and Drainage for Engineering Purposes

Chapter H. Introduction to Surface Water Hydrology and Drainage for Engineering Purposes Chapter H. Introduction to Surface Water Hydrology and Drainage for Engineering Purposes As seen in Figure H.1, hydrology is a complex science that deals with the movement of water between various stages

More information

5/11/2007. WinTR-55 for Plan Reviewers Small Watershed Hydrology Hydrology Terms and Definitions

5/11/2007. WinTR-55 for Plan Reviewers Small Watershed Hydrology Hydrology Terms and Definitions WinTR-55 for Plan Reviewers Small Watershed Hydrology Hydrology Terms and Definitions 1 Course Outline Overview Review of Hydrology Terms and Definitions Modeling Single Sub-area Watersheds Multiple Sub-area

More information

Learn how to design inlet grates, detention basins, channels, and riprap using the FHWA Hydraulic Toolbox and WMS

Learn how to design inlet grates, detention basins, channels, and riprap using the FHWA Hydraulic Toolbox and WMS v. 11.0 WMS 11.0 Tutorial Learn how to design inlet grates, detention basins, channels, and riprap using the FHWA Hydraulic Toolbox and WMS Objectives Learn how to use several Hydraulic Toolbox calculators

More information

PONDS 3.2 Technical Memo SUBJECT:

PONDS 3.2 Technical Memo SUBJECT: PONDS 3.2 Technical Memo SUBJECT: MODELING MULTIBASIN / INTERCONNECTED PONDS Date: January 21, 2008 The following memo discusses the Multibasin SCS hydrograph in the PONDS 3.2 Refined Method software,

More information

Chapter Introduction. 5.2 Computational Standard Methods HYDROLOGY

Chapter Introduction. 5.2 Computational Standard Methods HYDROLOGY Chapter 5. HYDROLOGY 5.1 Introduction The definition of hydrology is the scientific study of water and its properties, distribution, and effects on the earth s surface, in the soil and the atmosphere.

More information

HERPIC County Storm Drainage Manual

HERPIC County Storm Drainage Manual HERPIC County Storm Drainage Manual C h r is t o p h e r B. B u r k e Research Assistant Highway Extension and Research Project for Indiana Counties Purdue University The HERPIC (Highway Extension and

More information

CVEN 339 Summer 2009 Final Exam. 120 minutes allowed. 36 Students. No curve applied to grades. Median 70.6 Mean 68.7 Std. Dev High 88 Low 24.

CVEN 339 Summer 2009 Final Exam. 120 minutes allowed. 36 Students. No curve applied to grades. Median 70.6 Mean 68.7 Std. Dev High 88 Low 24. CVEN 339 Final Exam 120 minutes allowed 36 Students No curve applied to grades Median 70.6 Mean 68.7 Std. Dev. 13.7 High 88 Low 24.5 Name: CVEN 339 Water Resources Engineering Summer Semester 2009 Dr.

More information

WMS 8.4 Tutorial Storm Drain Modeling Storm Drain: Hydrographic Design Learn how to run sub-basin hydrographs through a storm drain network

WMS 8.4 Tutorial Storm Drain Modeling Storm Drain: Hydrographic Design Learn how to run sub-basin hydrographs through a storm drain network v. 8.4 WMS 8.4 Tutorial Storm Drain Modeling Storm Drain: Hydrographic Design Learn how to run sub-basin hydrographs through a storm drain network Objectives Build a rational method model and compute sub-basin

More information

RETENTION BASIN EXAMPLE

RETENTION BASIN EXAMPLE -7 Given: Total Tributary Area = 7.5 ac o Tributary Area within Existing R/W = 5.8 ac o Tributary Area, Impervious, Outside of R/W = 0.0 ac o Tributary Area, Pervious, Outside of R/W = 1.7 ac o Tributary

More information

WMS 9.1 Tutorial Storm Drain Modeling Storm Drain: Hydrographic Design Learn how to run sub-basin hydrographs through a storm drain network

WMS 9.1 Tutorial Storm Drain Modeling Storm Drain: Hydrographic Design Learn how to run sub-basin hydrographs through a storm drain network v. 9.1 WMS 9.1 Tutorial Storm Drain Modeling Storm Drain: Hydrographic Design Learn how to run sub-basin hydrographs through a storm drain network Objectives Build a rational method model and compute sub-basin

More information

Inflow Design Flood Control System Plan

Inflow Design Flood Control System Plan Inflow Design Flood Control System Plan Scrubber Ponds Lewis & Clark Station Prepared for Montana-Dakota Utilities Co. November 2018 234 West Century Avenue Bismarck, ND 58503 701.255.5460 www.barr.com

More information

BMP Design Aids. w w w. t r a n s p o r t a t i o n. o h i o. g o v. Equations / Programs

BMP Design Aids. w w w. t r a n s p o r t a t i o n. o h i o. g o v. Equations / Programs BMP Design Aids 1 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 2 Ohio Department of Transportation 1 Training Intent Introduction and overview of

More information

Stormwater Review Part 2. Rainfall and Runoff. Tom Seybert, PE and Andy Bennett, PE. Pennsylvania Surveyors Conference 2019

Stormwater Review Part 2. Rainfall and Runoff. Tom Seybert, PE and Andy Bennett, PE. Pennsylvania Surveyors Conference 2019 Stormwater Review Part 2 Rainfall and Runoff Tom Seybert, PE and Andy Bennett, PE Pennsylvania Surveyors Conference 2019 1 Topics Covered 1. Rainfall characteristics and sources 2. Watershed characteristics

More information

WinTR-55 Small Watershed Hydrology

WinTR-55 Small Watershed Hydrology WinTR-55 Small Watershed Hydrology Modeling Single Sub-area Watersheds (Part 2) We ve looked at the minimum data entry requirements and how we can enter curve numbers and times of concentration directly

More information

Introduction to Storm Sewer Design

Introduction to Storm Sewer Design A SunCam online continuing education course Introduction to Storm Sewer Design by David F. Carter Introduction Storm sewer systems are vital in collection and conveyance of stormwater from the upstream

More information

Overview of NRCS (SCS) TR-20 By Dr. R.M. Ragan

Overview of NRCS (SCS) TR-20 By Dr. R.M. Ragan Overview of NRCS (SCS) TR-20 By Dr. R.M. Ragan TR-20 is a computer program for the simulation of runoff occurring from a single storm event. The program develops flood hydrographs from runoff and routes

More information

Physics 141 Plotting on a Spreadsheet

Physics 141 Plotting on a Spreadsheet Physics 141 Plotting on a Spreadsheet Version: Fall 2018 Matthew J. Moelter (edited by Jonathan Fernsler and Jodi L. Christiansen) Department of Physics California Polytechnic State University San Luis

More information

Run-on and Run-off Control System Plan

Run-on and Run-off Control System Plan Run-on and Run-off Control System Plan CCR Temporary Storage Pad Lewis and Clark Station Prepared for Montana-Dakota Utilities Co. October 2016 Paul T. Swenson 2016.10.13 18:30:03-05'00' 234 West Century

More information

Figure 1: Overview of all AutoCAD generated cross-sections.

Figure 1: Overview of all AutoCAD generated cross-sections. RocScience Slope Stability Modeling Software RocScience s Slide is a program that was used to evaluate Odell Dam slope stability conditions. Slide is a 2D limit equilibrium slope stability program that

More information

Precipitation Surface Cover Topography Soil Properties

Precipitation Surface Cover Topography Soil Properties Precipitation Surface Cover Topography Soil Properties Intrinsic capacity of rainfall to cause erosion Influenced by Amount, intensity, terminal velocity, drop size and drop size distribution of rain.

More information

SECTION IV WATERSHED TECHNICAL ANALYSIS

SECTION IV WATERSHED TECHNICAL ANALYSIS A. Watershed Modeling SECTION IV WATERSHED TECHNICAL ANALYSIS An initial step in the preparation of this stormwater management plan was the selection of a stormwater simulation model to be utilized. It

More information

Rainfall - runoff: Unit Hydrograph. Manuel Gómez Valentín E.T.S. Ing. Caminos, Canales y Puertos de Barcelona

Rainfall - runoff: Unit Hydrograph. Manuel Gómez Valentín E.T.S. Ing. Caminos, Canales y Puertos de Barcelona Rainfall - runoff: Unit Hydrograph Manuel Gómez Valentín E.T.S. ng. Caminos, Canales y Puertos de Barcelona Options in many commercial codes,, HMS and others HMS Menu Transform method, User specified,

More information

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT GREENE COUNTY ASH POND ALABMA POWER COMPANY

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT GREENE COUNTY ASH POND ALABMA POWER COMPANY INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT GREENE COUNTY ASH POND ALABMA POWER COMPANY Section 257.82 of EPA s regulations requires the owner or operator of an existing or new CCR surface impoundment

More information

12d Solutions Pty Ltd CIVIL AND SURVEYING SOFTWARE

12d Solutions Pty Ltd CIVIL AND SURVEYING SOFTWARE Civil and Surveying Software Version 9 Course Notes CIVIL AND SURVEYING SOFTWARE THE 12D PERSPECTIVE 12d Solutions Pty Limited ACN 056 019 713 Phone: +61 (2) 9970 7117 Fax: +61 (2) 9970 7118Email training@12d.com

More information

Runoff Calculations. Time of Concentration (T c or t c ) from one location to another within a watershed. Travel

Runoff Calculations. Time of Concentration (T c or t c ) from one location to another within a watershed. Travel Runoff Calculations Bob Pitt University of Alabama and Shirley Clark Penn State Harrisburg Time of Concentration and Travel Time (based on Chapter 3 of TR-55) Time of Concentration (T c ): time required

More information

Green Station CCR Surface Impoundment

Green Station CCR Surface Impoundment Green Station CCR Surface Impoundment Disposal of Coal Combustion Residuals (CCR) from Electric Utilities Final Rule Hydrologic and Hydraulic Capacity Assessment and Initial Inflow Design Flood Control

More information

Detention Pond Design Considering Varying Design Storms. Receiving Water Effects of Water Pollutant Discharges

Detention Pond Design Considering Varying Design Storms. Receiving Water Effects of Water Pollutant Discharges Detention Pond Design Considering Varying Design Storms Land Development Results in Increased Peak Flow Rates and Runoff Volumes Developed area Robert Pitt Department of Civil, Construction and Environmental

More information

APPENDIX E APPENDIX E ESTIMATING RUNOFF FOR SMALL WATERSHEDS

APPENDIX E APPENDIX E ESTIMATING RUNOFF FOR SMALL WATERSHEDS APPENDIX E ESTIMATING RUNOFF FOR SMALL WATERSHEDS March 18, 2003 This page left blank intentionally. March 18, 2003 TABLES Table E.1 Table E.2 Return Frequencies for Roadway Drainage Design Rational Method

More information

CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL

CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL SECTION 600 STORM RUNOFF TABLE OF CONTENTS 601 INTRODUCTION 603 601.1 - Basin Characteristics 603 602 TIME OF

More information

APPENDIX E ESTIMATING RUNOFF FROM SMALL WATERSHEDS

APPENDIX E ESTIMATING RUNOFF FROM SMALL WATERSHEDS ESTIMATING RUNOFF FROM SMALL WATERSHEDS June 2011 THIS PAGE LEFT BLANK INTENTIONALLY. June 2011 TABLES Table E.1 Table E.2 Return Frequencies for Roadway Drainage Design Rational Method Values June 2011

More information

Index. Page numbers followed by f indicate figures.

Index. Page numbers followed by f indicate figures. Index Aerodynamic method, 103, 110 111 Algae, 131, 173, 175 Alternate depth, 88 Alternating block method, 132, 140 141 Attenuation, 106, 107f, 118, 120 Page numbers followed by f indicate figures. Baseflow

More information

Utah State University Department of Civil and Environmental Engineering CEE 3430 Engineering Hydrology Test 2. Date: 3/31/2014

Utah State University Department of Civil and Environmental Engineering CEE 3430 Engineering Hydrology Test 2. Date: 3/31/2014 Utah State University Department of Civil and Environmental Engineering CEE 3430 Engineering Hydrology Test 2. Date: 3/31/2014 D.G. Tarboton Time: 50 min 45 Points Open Book. Answer all questions. Please

More information

2

2 1 2 3 4 5 6 The program is designed for surface water hydrology simulation. It includes components for representing precipitation, evaporation, and snowmelt; the atmospheric conditions over a watershed.

More information

APPENDIX F RATIONAL METHOD

APPENDIX F RATIONAL METHOD 7-F-1 APPENDIX F RATIONAL METHOD 1.0 Introduction One of the most commonly used procedures for calculating peak flows from small drainages less than 200 acres is the Rational Method. This method is most

More information

Storm Sewer Design - Introduction

Storm Sewer Design - Introduction Class 4 [1] Storm Sewer Design - Introduction As urban drainage can not be expected to accommodate all rainfall events, the first step in the design procedure is to select an appropriate design storm.

More information

Appendix A. Compliance Calculator Guidance

Appendix A. Compliance Calculator Guidance Compliance Calculator Guidance Appendix A Appendix A. Compliance Calculator Guidance A.1 Introduction The Center for Watershed Protection created the compliance calculator spreadsheet to allow a designer

More information

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. Part PLANT MCINTOSH ASH POND 1 GEORGIA POWER COMPANY

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. Part PLANT MCINTOSH ASH POND 1 GEORGIA POWER COMPANY INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. Part 257.82 PLANT MCINTOSH ASH POND 1 GEORGIA POWER COMPANY EPA s Disposal of Coal Combustion Residuals from Electric Utilities Final Rule (40 C.F.R. Part

More information

Appendix F. Flow Duration Basin Design Guidance

Appendix F. Flow Duration Basin Design Guidance Appendix F Flow Duration Basin Design Guidance Appendix F FINAL REPORT F:\SC46\SC46.31\HMP Mar 05\Appendices\Appendix F FLY_HMP.doc MARCH 2005 Appendix F Flow Duration Basin Design Guidance Prepared by

More information

CIE4491 Lecture. Quantifying stormwater flow Rational method

CIE4491 Lecture. Quantifying stormwater flow Rational method CIE4491 Lecture. Quantifying stormwater flow Rational method 27-5-2014 Marie-claire ten Veldhuis, Watermanagement Department Delft University of Technology Challenge the future Robust method stationary

More information

Development of a GIS Tool for Rainfall-Runoff Estimation

Development of a GIS Tool for Rainfall-Runoff Estimation Development of a GIS Tool for Rainfall-Runoff Estimation Ashraf M. Elmoustafa * M. E. Shalaby Ahmed A. Hassan A.H. El-Nahry Irrigation and Hydraulics Department, Ain Shams University, Egypt NARSS, Egypt

More information

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT BARRY ASH POND ALABAMA POWER COMPANY

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT BARRY ASH POND ALABAMA POWER COMPANY INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT BARRY ASH POND ALABAMA POWER COMPANY Section 257.82 of EPA s regulations requires the owner or operator of an existing or new CCR surface impoundment or any

More information

Hydrology for Drainage Design. Design Considerations Use appropriate design tools for the job at hand:

Hydrology for Drainage Design. Design Considerations Use appropriate design tools for the job at hand: Hydrology for Drainage Design Robert Pitt Department of Civil and Environmental Engineering University of Alabama Tuscaloosa, AL Objectives for Urban Drainage Systems are Varied Ensure personal safety

More information

Hydrology Studio User's Guide

Hydrology Studio User's Guide Hydrology Studio User's Guide 2 Hydrology Studio Table of Contents Foreword 0 Part I Introduction 4 1 Installing... and Activating 6 2 Getting... Updates 7 3 About... This Guide 8 10 Part II Overview 1

More information

HYDROLOGIC MODELING CONSISTENCY AND SENSITIVITY TO WATERSHED SIZE

HYDROLOGIC MODELING CONSISTENCY AND SENSITIVITY TO WATERSHED SIZE HYDROLOGIC MODELING CONSISTENCY AND SENSITIVITY TO WATERSHED SIZE by James C.Y. Guo. Professor, Civil Engineering, U. Of Colorado at Denver, James.Guo@cudenver.edu.. And Eric Hsu, Project Engineer, Parson

More information

Autumn semester of Prof. Kim, Joong Hoon

Autumn semester of Prof. Kim, Joong Hoon 1 Autumn semester of 2010 Prof. Kim, Joong Hoon Water Resources Hydrosystems System Engineering Laboratory Laboratory 2 A. HEC (Hydrologic Engineering Center) 1 Established in the U.S. Army Corps of Engineers(USACE)

More information

GRACE: Tracking Water from Space. Groundwater Storage Changes in California s Central Valley Data Analysis Protocol for Excel: PC

GRACE: Tracking Water from Space. Groundwater Storage Changes in California s Central Valley Data Analysis Protocol for Excel: PC Groundwater Storage Changes in California s Central Valley Data Analysis Protocol for Excel: PC 2007-10 Before GRACE it was very difficult to estimate how the total volumes of groundwater are changing.

More information

RUN-ON AND RUN-OFF CONTROL PLAN 40 C.F.R. PART PLANT DANIEL NORTH ASH MANAGEMENT UNIT MISSISSIPPI POWER COMPANY

RUN-ON AND RUN-OFF CONTROL PLAN 40 C.F.R. PART PLANT DANIEL NORTH ASH MANAGEMENT UNIT MISSISSIPPI POWER COMPANY RUN-ON AND RUN-OFF CONTROL PLAN 40 C.F.R. PART 257.81 PLANT DANIEL NORTH ASH MANAGEMENT UNIT MISSISSIPPI POWER COMPANY EPA s Disposal of Coal Combustion Residuals from Electric Utilities Final Rule (40

More information

Inflow Design Flood Control System Plan

Inflow Design Flood Control System Plan Inflow Design Flood Control System Plan For Compliance with the Coal Combustion Residuals Rule (40 CFR Part 257) Valmont Station - CCR Surface Impoundments Public Service Company of Colorado Denver, Colorado

More information

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT GASTON GYPSUM POND ALABAMA POWER COMPANY

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT GASTON GYPSUM POND ALABAMA POWER COMPANY INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN PLANT GASTON GYPSUM POND ALABAMA POWER COMPANY Section 257.82 of EPA s regulations requires the owner or operator of an existing or new CCR surface impoundment or

More information

MODULE 1 RUNOFF HYDROGRAPHS WORKSHEET 1. Precipitation

MODULE 1 RUNOFF HYDROGRAPHS WORKSHEET 1. Precipitation Watershed MODULE 1 RUNOFF HYDROGRAPHS WORKSHEET 1 A watershed is an area of land thaaptures rainfall and other precipitation and funnels it to a lake or stream or wetland. The area within the watershed

More information

CEE3430 Engineering Hydrology

CEE3430 Engineering Hydrology CEE3430 Engineering Hydrology Practice Exam (There are multiple practice questions here A 110 min test will likely not have more than four questions) 1. Water Balance Write the water balance as Δ Where

More information

LAKE COUNTY HYDROLOGY DESIGN STANDARDS

LAKE COUNTY HYDROLOGY DESIGN STANDARDS LAKE COUNTY HYDROLOGY DESIGN STANDARDS Lake County Department of Public Works Water Resources Division 255 N. Forbes Street Lakeport, CA 95453 (707)263-2341 Adopted June 22, 1999 These Standards provide

More information

TECHNICAL MEMORANDUM. SUBJECT: Determination of watershed historic peak flow rates as the basis for detention basin design

TECHNICAL MEMORANDUM. SUBJECT: Determination of watershed historic peak flow rates as the basis for detention basin design TECHNICAL MEMORANDUM FROM: Ken MacKenzie and Ryan Taylor SUBJECT: Determination of watershed historic peak flow rates as the basis for detention basin design DATE: June 7, 2012 The purpose of this memorandum

More information

SITE DESIGN ENGINEERING, LLC. 11 Cushman Street, Middleboro, MA P: F:

SITE DESIGN ENGINEERING, LLC. 11 Cushman Street, Middleboro, MA P: F: INTRODUCTION This drainage report was prepared for the proposed site re-development at in Burlington, Massachusetts. The project site is approximately 1.05± acres consisting of approximately 70% impervious

More information

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. PART PLANT DANIEL ASH POND B MISSISSIPPI POWER COMPANY

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. PART PLANT DANIEL ASH POND B MISSISSIPPI POWER COMPANY INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. PART 257.82 PLANT DANIEL ASH POND B MISSISSIPPI POWER COMPANY EPA s Disposal of Coal Combustion Residuals from Electric Utilities Final Rule (40 C.F.R.

More information

Q = CiA. Objectives. Approach

Q = CiA. Objectives. Approach Date: February 5, 2018 To: John Mathews, Ohio EPA From: Justin Reinhart, Ohio EPA Jay Dorsey, Ohio State University Stormwater Management Program Re: Intensity-Duration Curve for Water Quality Flow Background

More information

SECTION III: WATERSHED TECHNICAL ANALYSIS

SECTION III: WATERSHED TECHNICAL ANALYSIS Trout Creek Watershed Stormwater Management Plan SECTION III: WATERSHED TECHNICAL ANALYSIS A. Watershed Modeling An initial step this study of the Trout Creek watershed was the selection of a stormwater

More information

Design of Stormwater Wetlands

Design of Stormwater Wetlands Hydraulic & Hydrologic Stormwater Engineering Design of Stormwater Wetlands Jon Hathaway, EI Extension Associate NCSU Bio. And Ag. Engineering 6 Step Process 1. Watershed Analysis (Runoff Volume and Peak

More information

FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5) 1.0 Overview

FORT COLLINS STORMWATER CRITERIA MANUAL Hydrology Standards (Ch. 5) 1.0 Overview Chapter 5: Hydrology Standards Contents 1.0 Overview... 1 1.1 Storm Runoff Determination... 1 1.2 Design Storm Frequencies... 1 1.3 Water Quality Storm Provisions... 2 1.4 Design Storm Return Periods...

More information

MSI Purchase Orders Version 4.0

MSI Purchase Orders Version 4.0 MSI Purchase Orders Version 4.0 User s Guide Municipal Software, Inc. 1850 W. Winchester Road, Ste 209 Libertyville, IL 60048 Phone: (847) 362-2803 Fax: (847) 362-3347 Contents are the exclusive property

More information

STORMWATER HYDROLOGY

STORMWATER HYDROLOGY ..CHAPTER.. STORMWATER HYDROLOGY 3.1 Introduction to Hydrologic Methods Hydrology is the science dealing with the characteristics, distribution, and movement of water on and below the earth's surface and

More information

Rainfall, Runoff and Peak Flows: Calibration of Hydrologic Design Methods for the Kansas City Area

Rainfall, Runoff and Peak Flows: Calibration of Hydrologic Design Methods for the Kansas City Area Rainfall, Runoff and Peak Flows: Calibration of Hydrologic Design Methods for the Kansas City Area Bruce McEnroe, Bryan Young, Ricardo Gamarra and Ryan Pohl Department of Civil, Environmental, and Architectural

More information

Initial Inflow Design Flood Control System Plan

Initial Inflow Design Flood Control System Plan Initial Inflow Design Flood Control System Plan Brunner Island Ash Basin No. 6 Prepared for: Brunner Island, LLC October 11, 2016 This page intentionally left blank. Initial Inflow Design Flood Control

More information

Modeling the Hydrologic Impacts of Control Structures Utilizing LiDAR, ICPR, and GIS Technologies

Modeling the Hydrologic Impacts of Control Structures Utilizing LiDAR, ICPR, and GIS Technologies Modeling the Hydrologic Impacts of Control Structures Utilizing LiDAR, ICPR, and GIS Technologies Keanan Bell NorthStar June 12, 2015 Project began in 2010 as a Hydrology Assessment and Conceptual Restoration

More information

Introduction, HYDROGRAPHS

Introduction, HYDROGRAPHS HYDROGRAPHS Sequence of lecture Introduction Types of Hydrograph Components of Hydrograph Effective Rainfall Basin Lag or Time Lag Parts of Hydrograph Hydrograph Analysis Factors Affecting Hydrograph Shape

More information

Table of Contents CHAPTER. Chapter 2 Hydrologic Analysis. 2.1 Estimating Runoff

Table of Contents CHAPTER. Chapter 2 Hydrologic Analysis. 2.1 Estimating Runoff CHAPTER Table of Contents 2 Chapter 2 Hydrologic Analysis 2.1 Estimating Runoff 2.1.1 Introduction to Hydrologic Methods...2.1-1 2.1.2 Symbols and Definitions...2.1-4 2.1.3 Rainfall Estimation...2.1-5

More information

Finance Manager: Human Resources

Finance Manager: Human Resources : Human Resources Benefit Dependent Assignment This Benefit Dependent Assignment utility will do the following: link any existing dependents to a benefit group (e.g., Health, Dental, Vision, etc.) based

More information

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. PART PLANT YATES ASH POND B (AP-B ) GEORGIA POWER COMPANY

INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. PART PLANT YATES ASH POND B (AP-B ) GEORGIA POWER COMPANY INFLOW DESIGN FLOOD CONTROL SYSTEM PLAN 40 C.F.R. PART 257.82 PLANT YATES ASH POND B (AP-B ) GEORGIA POWER COMPANY EPA s Disposal of Coal Combustion Residuals from Electric Utilities Final Rule (40 C.F.R.

More information

iswm TM Technical Manual Hydrology:

iswm TM Technical Manual Hydrology: : 1.0 2.0 Downstream Assessment 3.0 Streambank Protection 4.0 Water Balance 5.0 Rainfall Tables 6.0 Hydrologic Soils Data Table of Contents 1.0... HO-1 1.1 Estimating Runoff... HO-1 1.1.1 Introduction

More information

What is runoff? Runoff. Runoff is often defined as the portion of rainfall, that runs over and under the soil surface toward the stream

What is runoff? Runoff. Runoff is often defined as the portion of rainfall, that runs over and under the soil surface toward the stream What is runoff? Runoff Runoff is often defined as the portion of rainfall, that runs over and under the soil surface toward the stream 1 COMPONENTS OF Runoff or STREAM FLOW 2 Cont. The types of runoff

More information

REPORTING ON HISTORICAL CHANGES IN YOUR DATA

REPORTING ON HISTORICAL CHANGES IN YOUR DATA REPORTING ON HISTORICAL CHANGES IN YOUR DATA Summary Get deeper insight and make data-driven decisions by analyzing your organization's activity over over the last three months. Report on Historical Changes

More information

Los Angeles Unified School District M&O POLARIS Work Management System Assignment and Time Reporting Guide rev.4

Los Angeles Unified School District M&O POLARIS Work Management System Assignment and Time Reporting Guide rev.4 Los Angeles Unified School District M&O POLARIS Work Management System rev.4 1 POLARIS Work Management System introduced: Polaris is a new Maintenancee and Operations Work Management System that will allow

More information

Stormwater Analysis Report

Stormwater Analysis Report Stormwater Analysis Report Solar Panel Array Temple Street (Rt. 14) West Boylston, MA February 24, 216 SITE Prepared for: West Boylston Municipal Lighting Plant 4 Crescent Street West Boylston, MA 1583

More information

SOUTHEAST TEXAS CONTINUING EDUCATION

SOUTHEAST TEXAS CONTINUING EDUCATION EXAM No. 118 FLOOD - RUNOFF ANALYSIS 1. Information gained from flood - runoff analysis includes which one: A. Stage, discharge, volume. B. Measure depth, volume. C. Velocity, depth, storm occurrence.

More information

The Texas A&M University and U.S. Bureau of Reclamation Hydrologic Modeling Inventory (HMI) Questionnaire

The Texas A&M University and U.S. Bureau of Reclamation Hydrologic Modeling Inventory (HMI) Questionnaire The Texas A&M University and U.S. Bureau of Reclamation Hydrologic Modeling Inventory (HMI) Questionnaire May 4, 2010 Name of Model, Date, Version Number Dynamic Watershed Simulation Model (DWSM) 2002

More information

CE Hydraulics. Andrew Kennedy 168 Fitzpatrick

CE Hydraulics. Andrew Kennedy 168 Fitzpatrick CE 40450 Hydraulics Andrew Kennedy 168 Fitzpatrick Andrew.kennedy@nd.edu Final Exam, 8AM May 7, Will cover entire course 155 Fitzpatrick Around half on material since last midterm Like 1.5 midterms in

More information

A Comparison of Runoff Estimation Techniques

A Comparison of Runoff Estimation Techniques A Comparison of Runoff Estimation Techniques by David E. Fantina, PE Introduction: This course presents an overview of and comparison of different methodologies for computing stormwater runoff. As explained

More information