# Basic Hydrology. Time of Concentration Methodology

Size: px
Start display at page:

Transcription

1 Basic Hydrology Time of Concentration Methodology By: Paul Schiariti, P.E., CPESC Mercer County Soil Conservation District

2 What is the Time of Concentration? The time it takes for runoff to travel from the most hydraulically distant point in the watershed to a point of interest. What is the most Hydraulically Distant Point in the watershed? Is it a hydraulic distance or a hydraulic time? Is there a difference?

3 Hydraulically Most Distant Point? Path A is 1000 ft. long with a Time of Concentration = 1.00 Hours Path B is 750 ft. long with a Time of Concentration = 1.25 Hours

4 Where is the Correct TC Flow Path?

5 What is the difference in T C for both Flow Paths? Path B T C = 0.39 Hours, Path A T C = 0.20 Hours

6 What is the difference in Q PEAK for the two Flow Paths & which is correct? Approximately 9 Acres of the 10 Acres flows similar to Path B, therefore this path is representative of 90% of the drainage area, and realistically better represents the watershed The use of T C Flow Path B represents an underestimation of Q PEAK by 19 to 20%. Would this be an issue if it was the Pre- Development analysis?

7 Three Components of the Segmental Time of Concentration Method 1. Sheet Flow: Sheet flow is flow over plane surfaces. It usually occurs in the headwater of streams. The most sensitive component of the T C. Pay very close attention to the Manning s Roughness Coefficient. Pay very close attention to the ground surface slope. The maximum sheet flow length should be no greater than 125 to 150 ft. 2. Shallow Concentrated Flow: After a maximum of 300 feet, sheet flow usually becomes shallow concentrated flow. Note: This 300 ft. value has since been revised down to a maximum of 150 ft. on very uniform surfaces. The latest version of WinTR-55 only allows up to 100 ft. of sheet flow. 3. Channel Flow: Channel flow occurs within swales, channels, streams, ditches and piped storm drainage systems. Velocities are computed for channel flow based upon Manning s open channel flow equation.

8 TR-55 Segmental Time of Concentration Sheet Flow Travel Time Component P 2 values are obtained from NRCS 24 Hour Design Storm Rainfall Depths.

9 TR-55 Segmental Time of Concentration Shallow Concentrated Flow and Channel Flow Component

10 How sensitive is the Sheet Flow equation to Manning s n? Sheet Flow Equation: T T = (.007) x (n) 0.8 x (L) 0.8 P x S 0.4 Example: L = 125 ft. P 2 = 3.00 In. S = ft / ft Lets say an n value of 0.05 was mistakenly used when an n value of 0.24 was the appropriate value. What effect will this have on the Time of Concentration? What effect will this have on the peak discharge rates? n = 0.05: n = 0.24: T T = (.007) x (0.05) 0.8 x (125) 0.8 = Hours (Incorrect) x T T = (.007) x (0.24) 0.8 x (125) 0.8 = Hours (Correct) x This represents an under-estimation of the Time of Concentration of 71%!!!

11 How does this effect the peak Discharge? Drainage Area = Acres Runoff Curve Number = Year Storm Precipitation = 5.00 Inches Additional Travel Time for Shallow Concentrated Flow Plus Channel Flow = 0.50 Hours T C1 = Hours Hours = Hours T C2 = Hours Hours = Hours Q 0.05 = cfs (Incorrect) Q 0.24 = cfs (Correct) Difference in Peak Discharge Rates = 6.60 cfs Over estimates the peak discharge by 27.4%!!

12 Effect on the Runoff Hydrograph for the different T C s Not only is the actual Peak Discharge different But the timing of the Peak Discharge is different as well.

13 What is the correct Manning s n value? B A Manning s n for Maintained Turf Grass should almost always be = 0.24

14 Percent Increase In The Sheet Flow Travel Time Related to Change In Ground Slope Ground Slope In % % Decrease In Sheet Flow Tt % An over-estimation of ground slope from 1.00 % to 2.00 % results in an under-estimation in the Sheet Flow component of the Time of Concentration by 25 %.

15 Example Time of Concentration Calculation Channel Flow Shallow Concentrated Flow Sheet Flow 250 ft. 125 ft. 100 ft X "D" X "C" X "B" X "A" Note: The individual segment lengths are not the horizontal distances, but the linear distances along the flow path line.

16 Example - Continued 1. Compute the Sheet Flow Travel Time Component of the Time of Concentration: A Sheet Flow 100 ft. X "B" X "A" B What surface description best categorizes this type of ground cover for the purpose of choosing a Manning s n Roughness Coefficient?

17 Which Manning s n value most closely mimics this specific ground cover? We can immediately eliminate the following: Smooth Surfaces Fallow (No Residue) Cultivated Soil Woods This leaves the following choices: Grass Range Range is defined as: An extensive tract of open land on which livestock wander and graze. This is not a range! This leaves us with the grass options: Best fit is Dense Grasses n = 0.24

18 Compute the Sheet Flow Travel Time Component: Sheet Flow Equation: T T = (.007) x (n) 0.8 x (L) 0.8 P x S 0.4 L = 100 ft. P 2 = 3.00 In. S = ( )/ 100 = 0.01 ft / ft n = 0.24 T T = (.007) x (0.24) 0.8 x (100) 0.8 = Hrs x The next component of the Time of Concentration is the shallow Concentrated flow Travel Time portion.

19 Shallow Concentrated Flow Component of the Time of Concentration B 99.5 S hallow Concentrated Flow 125 ft. S C 96.0 X "C" X "B" Shallow Concentrated Flow is 125 ft. (non-paved) at ( ) /125 = ft/ft

20 Enter Figure 3-1 to arrive at the Average Velocity T T = 125 / 3600 x 2.70 = hrs ft/ft The actual equation used to determine the velocity for Shallow Concentrated flow is based on: 2.7 fps T T = L * (58,084.2 * s 0.5 ) -1 -or- T T = L 3600 x x S 0.5 Therefore: V = x S 0.5

21 Channel Flow Component of the Time of Concentration C Channel Flow 250 ft Con D 93.3 X "D" X "C" The Channel Slope is 250 ft. at ( )/250 = ft/ft Note: The channel does not have to possess a visible water surface to be considered channel flow.

22 Solve Manning s equation to arrive at the Channel Velocity Wow! There are several unknown variables here. How are we going to assign values to them? The first thing we need to know is the channel cross sectional geometry. 1.5 ft 5 ft 2 1 Assume a reasonable flow depth say 1.5 ft, and solve for the cross sectional flow area and the wetted perimeter. Approximate channel geometry

23 The first step is to compute the Hydraulic Radius: Compute the Hydraulic Radius as follows: 1.5 ft 5 ft 2 1 The Hydraulic Radius is equal to the cross sectional flow area divided by the wetted perimeter: A = (5.0 ft. x 1.5 ft.) + [(1.5 ft. x 2) x 1.5 ft.] = 12.0 s.f. WP = 5.0 ft. + [2 x (3.0 ft ft. 2 ) 1/2 ] = ft. R = 12.0 s.f. / ft. = ft. How do we compute the Manning s n roughness coefficient?

24 Method used to determine Manning s n value for earthen channels (Not to be confused with Manning s n for Sheet Flow) SUPPLEMENT A contained within Appendix A8 of the NJ STANDARDS entitled Method for Estimating Manning s n contains a practical methodology based upon Cowan's Equation : n =(n 0 + n 1 + n 2 + n 3 + n 4 ) x m 5 Where: n = Manning s n value n 0 = the portion of the n value that represents the channel material in a straight, uniform smooth reach n 1 = the additional value added to correct for the effect of channel surface irregularities n 2 = the additional value for variations in shape and size of the channel cross section through the reach n 3 = the additional value for obstructions (such as beaver dams, debris dams, stumps, downed trees, and root wads extending into the channel) n 4 = the additional value for vegetation in the channel m 5 = the correction factor for the meandering of the channel

25 Manning s n values to be used for Cowan s method for channel roughness Channel Conditions Values Material Involved Earth n Rock cut Fine gravel Coarse gravel Degree of Irregularity Smooth n 1 0 Minor Moderate 0.01 Severe 0.02 Variations of Channel Cross Section Gradual n 2 0 Alternating occasionally Alternating frequently Relative Effect of Obstructions Negligible n 3 0 Minor Appreciable Severe Vegetation Low n Medium High Very high Degree of Meandering Minor m 5 1 Appreciable 1.15 Severe 1.3

26 Compute Manning s n value for the channel n 0 = Earth Channel = 0.02 n 1 = Smooth Irregularity = 0.00 n 2 = Gradual Section Variations = 0.00 n 3 = Negligible Obstructions = 0.00 n 4 = Low to Medium Vegetation = m 5 = Minor Meandering = 1.00 Manning s n value = 0.03 x 1.00 = 0.03

27 Compute the Travel Time for the channel section V = x R 2/3 x S ½ n V = x /3 x ½ = 3.87 fps 0.03 T T = 250 / 3600 x 3.87 = hours The total Time of Concentration = T T1 + T T2 + T T3 = T C TC = Hr Hr Hr. = Hr.

28 What if our depth of flow assumption was incorrect? Lets say the actual flow depth was 0.5 ft. as opposed to our original assumption of 1.5 ft: 0.5 ft 5 ft 2 1 A = (5.0 ft. x 0.5 ft.) + [(0.5 ft. x 2) x 0.5 ft.] = 3.00 s.f. WP = 5.0 ft. + [2 x (1.0 ft ft. 2 ) 1/2 ] = 7.24ft. R = 12.0 s.f. / ft. = ft. V = x /3 x ½ = 2.86 fps 0.03 T T = 250 / 3600 x 2.86 = hours Remember our original TT was hours!! Really, not that much of a difference.

29 What is the correct Manning s n value for Sheet Flow? Is this Fallow (no residue) or Cultivated Soils: Residue Cover < 20%; n = 0.05 or 0.06?

30 What is the correct Manning s n value for Sheet Flow? Cultivated Soils: Residue Cover > 20%; n = 0.17

31 What is the correct Manning s n value for Sheet Flow? Smooth Surface (concrete, asphalt, gravel or bare soil); n = 0.011

32 What is the correct Manning s n value for Sheet Flow? Woods; Light Underbrush; n = 0.40

33 Summary: 1. Make sure the flow path is representative of the drainage area. 2. Check the Manning s n value in the sheet flow equation. 3. Check the slope used in the sheet flow equation. 4. Do the field conditions agree with the analysis? 5. If the Tc goes up from the pre-development to the post-development, there may be an error. 6. Tc should typically go down from pre to postdevelopment.

### Travel Time. Computation of travel time and time of concentration. Factors affecting time of concentration. Surface roughness

3 Chapter 3 of Concentration and Travel Time Time of Concentration and Travel Time Travel time ( T t ) is the time it takes water to travel from one location to another in a watershed. T t is a component

### CHAPTER 5 OPEN CHANNEL HYDROLOGY

5.4 Uniform Flow Calculations 5.4.1 Design Charts CHAPTER 5 OPEN CHANNEL HYDROLOGY Following is a discussion of the equations that can be used for the design and analysis of open channel flow. The Federal

### CITY UTILITIES DESIGN STANDARDS MANUAL

CITY UTILITIES DESIGN STANDARDS MANUAL Book 2 (SW) SW9 June 2015 SW9.01 Purpose This Chapter provides information for the design of open channels for the conveyance of stormwater in the City of Fort Wayne.

### Rational Method Hydrologic Calculations with Excel. Rational Method Hydrologic Calculations with Excel, Course #508. Presented by:

Rational Method Hydrologic Calculations with Excel, Course #508 Presented by: PDH Enterprises, LLC PO Box 942 Morrisville, NC 27560 www.pdhsite.com Calculation of peak storm water runoff rate from a drainage

### APPENDIX B DESIGN GUIDELINES FOR APPROVED TREATMENT METHODS

APPENDIX B DESIGN GUIDELINES FOR APPROVED TREATMENT METHODS PLANTER BOXES 1. Determine the impervious area contributing flow to the planter box (see Chapter 4.2). 2. Assumption: Typical soil infiltration

### Computing Stormwater Runoff Rates and Volumes

New Jersey Stormwater Best Management Practices Manual February 2004 C H A P T E R 5 Computing Stormwater Runoff Rates and Volumes This chapter discusses the fundamentals of computing stormwater runoff

### Topic 8: Open Channel Flow

3.1 Course Number: CE 365K Course Title: Hydraulic Engineering Design Course Instructor: R.J. Charbeneau Subject: Open Channel Hydraulics Topics Covered: 8. Open Channel Flow and Manning Equation 9. Energy,

### CHAPTER 3 STORM DRAINAGE SYSTEMS

CHAPTER 3 STORM DRAINAGE SYSTEMS 3.7 Storm Drains 3.7.1 Introduction After the tentative locations of inlets, drain pipes, and outfalls with tail-waters have been determined and the inlets sized, the next

### CHAPTER 2 HYDRAULICS OF SEWERS

CHAPTER 2 HYDRAULICS OF SEWERS SANITARY SEWERS The hydraulic design procedure for sewers requires: 1. Determination of Sewer System Type 2. Determination of Design Flow 3. Selection of Pipe Size 4. Determination

### Chapter 9. Steady Flow in Open channels

Chapter 9 Steady Flow in Open channels Objectives Be able to define uniform open channel flow Solve uniform open channel flow using the Manning Equation 9.1 Uniform Flow in Open Channel Open-channel flows

### CHAPTER 5 HYDROLOGIC ANALYSIS AND DESIGN

CHAPTER 5 HYDROLOGIC ANALYSIS AND DESIGN Chapter Organization 5.1 Introduction... 5-1 5.2 Hydrologic Analysis Methods... 5-1 5.3 Curve Number Method... 5-2 5.3.1 NRCS Curve Number Method Theory... 5-2

### The Rational Method. David B. Thompson Civil Engineering Deptartment Texas Tech University. Draft: 20 September 2006

The David B. Thompson Civil Engineering Deptartment Texas Tech University Draft: 20 September 2006 1. Introduction For hydraulic designs on very small watersheds, a complete hydrograph of runoff is not

### What is the most obvious difference between pipe flow and open channel flow????????????? (in terms of flow conditions and energy situation)

OPEN CHANNEL FLOW 1 3 Question What is the most obvious difference between pipe flow and open channel flow????????????? (in terms of flow conditions and energy situation) Typical open channel shapes Figure

### Storm Drainage Systems 11.9-1

Storm Drainage Systems 11.9-1 11.9 Gutter Flow Calculations 11.9.1 Introduction Gutter flow calculations are necessary in order to relate the quantity of flow (Q) in the curbed channel to the spread of

### Open Channel Flow 2F-2. A. Introduction. B. Definitions. Design Manual Chapter 2 - Stormwater 2F - Open Channel Flow

Design Manual Chapter 2 - Stormwater 2F - Open Channel Flow 2F-2 Open Channel Flow A. Introduction The beginning of any channel design or modification is to understand the hydraulics of the stream. The

### CHAPTER 9 CHANNELS APPENDIX A. Hydraulic Design Equations for Open Channel Flow

CHAPTER 9 CHANNELS APPENDIX A Hydraulic Design Equations for Open Channel Flow SEPTEMBER 2009 CHAPTER 9 APPENDIX A Hydraulic Design Equations for Open Channel Flow Introduction The Equations presented

### URBAN DRAINAGE CRITERIA

URBAN DRAINAGE CRITERIA I. Introduction This division contains guidelines for drainage system design and establishes a policy for recognized and established engineering design of storm drain facilities

### Appendix 4-C. Open Channel Theory

4-C-1 Appendix 4-C Open Channel Theory 4-C-2 Appendix 4.C - Table of Contents 4.C.1 Open Channel Flow Theory 4-C-3 4.C.2 Concepts 4-C-3 4.C.2.1 Specific Energy 4-C-3 4.C.2.2 Velocity Distribution Coefficient

### Riprap-lined Swale (RS)

Riprap-lined Swale (RS) Practice Description A riprap-lined swale is a natural or constructed channel with an erosion-resistant rock lining designed to carry concentrated runoff to a stable outlet. This

### TENNESSEE GAS PIPELINE COMPANY, L.L.C.

TENNESSEE GAS PIPELINE COMPANY, L.L.C. HYDROLOGIC & HYDRAULIC CALCULATIONS FOR WATERBODIES CROSSED BY CONNECTICUT PIPELINE EXPANSION PROJECT CONNECTICUT LOOP Submitted by: Tennessee Gas Pipeline Company,

### From Civil 3D, with Love

From Civil 3D, with Love Download the zip file containing the files needed for the exercise. Extract the files to a convenient location on your hard drive before you begin. The files associated with this

### Experiment (13): Flow channel

Introduction: An open channel is a duct in which the liquid flows with a free surface exposed to atmospheric pressure. Along the length of the duct, the pressure at the surface is therefore constant and

### Land Disturbance, Erosion Control and Stormwater Management Checklist. Walworth County Land Conservation Department

Land Disturbance, Erosion Control and Stormwater Management Checklist Walworth County Land Conservation Department The following checklist is designed to assist the applicant in complying with the Walworth

### H. Khalid Jamil 9367 Verain Street San Diego, CA, 92129 (858) 663-9200

OFFSITE DRAINAGE REPORT Ramona Assisted Living 1236 "D" Street Ramona, CA 92065 re~*7lb3 Prepared for H. Khalid Jamil 9367 Verain Street San Diego, CA, 92129 (858) 663-9200 July 1 1, 2008 Daniel Tobar,

### Emergency Spillways (Sediment basins)

Emergency Spillways (Sediment basins) DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short-Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1]

### Open Channel Flow in Aquaculture

SRAC Publication No. 74 Southern Regional Aquaculture Center March 1995 PR VI Open Channel Flow in Aquaculture J. David Bankston, Jr. 1 and Fred Eugene Baker Open channel flow of water has been used in

### Fort Dodge Stormwater Master Planning. Prepared By: Ralph C. Stark, Jr., P.E., C.F.M. Joel N. Krause, P.E., C.F.M.

Fort Dodge Stormwater Master Planning Prepared By: Ralph C. Stark, Jr., P.E., C.F.M. Joel N. Krause, P.E., C.F.M. Project Location Project Background Flooding History Localized flooding and storm sewer

### M6a: Open Channel Flow (Manning s Equation, Partially Flowing Pipes, and Specific Energy)

M6a: Open Channel Flow (, Partially Flowing Pipes, and Specific Energy) Steady Non-Uniform Flow in an Open Channel Robert Pitt University of Alabama and Shirley Clark Penn State - Harrisburg Continuity

### Index. protection. excavated drop inlet protection (Temporary) 6.50.1 6.51.1. Block and gravel inlet Protection (Temporary) 6.52.1

6 Index inlet protection excavated drop inlet protection (Temporary) 6.50.1 HARDWARE CLOTH AND GRAVEL INLET PROTECTION Block and gravel inlet Protection (Temporary) sod drop inlet protection ROCK DOUGHNUT

### SECTION 5 - STORM DRAINS

Drainage Criteria Manual SECTION 5 - STORM DRAINS 5.1.0 GENERAL This The purpose of this section discusses briefly is to consider the hydraulic aspects of storm drains and their appurtenances in a storm

### Stormwater Drainage Design for Parking Lots

PDHonline Course C201 (4 PDH) Stormwater Drainage Design for Parking Lots 2012 PDH Online PDH Center 5272 Meadow Estates Drive Fairfax, VA 22030-6658 Phone & Fax: 703-988-0088 www.pdhonline.org www.pdhcenter.com

### 2.0 BASIC CONCEPTS OF OPEN CHANNEL FLOW MEASUREMENT

2.0 BASIC CONCEPTS OF OPEN CHANNEL FLOW MEASUREMENT Open channel flow is defined as flow in any channel where the liquid flows with a free surface. Open channel flow is not under pressure; gravity is the

### Estimating Storm Water Runoff

PDHonline Course H119 (2 PDH) Estimating Storm Water Runoff Instructor: John Poullain, PE 2012 PDH Online PDH Center 5272 Meadow Estates Drive Fairfax, VA 22030-6658 Phone & Fax: 703-988-0088 www.pdhonline.org

### A n. P w Figure 1: Schematic of the hydraulic radius

BEE 473 Watershed Engineering Fall 2004 OPEN CHANNELS The following provide the basic equations and relationships used in open channel design. Although a variety of flow conditions can exist in a channel

### Stormwater Management Functional Servicing Report

Stormwater Management Functional Servicing Report Part of Lot 12, Concession 10 Township of Cavan Monaghan Ian Cameron Rural Subdivision Engage Project No. 14016 Engage Engineering Ltd. January 7, 2015

### 10/4/2012. 40 slide sample of Presentation. Key Principles to Current Stormwater Management

40 slide sample of Presentation Please contact mhoalton@pacewater.com if you would like the complete presentation Key Principles to Current Stormwater Management Distributed Control Measures Integrated

### 1800 Washington Boulevard, Baltimore, MD 21230-1718 www.mde.maryland.gov 410-537-3000 800-633-6101 TTY Users 800-735-2258 Larry Hogan, Governor Boyd

ENVIRONMENTAL SITE DESIGN (ESD) REDEVELOPMENT EXAMPLES OCTOBER 2010 1800 Washington Boulevard, Baltimore, MD 21230-1718 www.mde.maryland.gov 410-537-3000 800-633-6101 TTY Users 800-735-2258 Larry Hogan,

### ESTIMATING DISCHARGE AND STREAM FLOWS

ESTIMATING DISCHARGE AND STREAM FLOWS A Guide for Sand and Gravel Operators Prepared by: Joy P. Michaud and Marlies Wierenga, EnviroVision Art and design by: S. Noel, Noel Design, LLC July 2005 Ecology

### Chapter 5.0. Stormwater Credits for Innovative Site Planning

Chapter 5.0 Stormwater Credits for Innovative Site Planning Chapter 5. Stormwater Credits...Introduction 5.0 Stormwater Credits In Maryland, there are many programs at both the State and local level that

### Outlet stabilization structure

Overview of Sedimentation and Erosion Control Practices Practice no. 6.41 Outlet stabilization structure Erosion at the outlet of channels, culverts, and other structures is common, and can cause structural

### STORM DRAINS CHAPTER 7

CHAPTER 7 Chapter 7 - Storm Drains A storm drain is a drainage system that conveys water or stormwater, consisting of two or more pipes in a series connected by one or more structures. Storm drains collect

### STATE OF FLORIDA DEPARTMENT OF TRANSPORTATION DRAINAGE HANDBOOK OPEN CHANNEL. OFFICE OF DESIGN, DRAINAGE SECTION November 2009 TALLAHASSEE, FLORIDA

STATE OF FLORIDA DEPARTMENT OF TRANSPORTATION DRAINAGE HANDBOOK OPEN CHANNEL OFFICE OF DESIGN, DRAINAGE SECTION TALLAHASSEE, FLORIDA Table of Contents Open Channel Handbook Chapter 1 Introduction... 1

### Design Charts for Open-Channel Flow HDS 3 August 1961

Design Charts for Open-Channel Flow HDS 3 August 1961 Welcome to HDS 3-Design Charts for Open-Channel Flow Table of Contents Preface DISCLAIMER: During the editing of this manual for conversion to an electronic

### CHAPTER 5. Storm Sewer

CHAPTER 5 Storm Sewer A. Introduction All proposed developments shall have a properly designed and constructed storm water conveyance system. This chapter deals only with the conveyance system. Storm water

### Small Dam Hazard Assessment Inventory

Small Dam Hazard Assessment Inventory What would happen if your dam were to fail? This is a question that most dam owners hope they will never have to answer. However it is a question you, as a responsible

### City of La Quinta Public Works Department - Storm Drain Plan Review Checklist

Tract or Parcel Project Name PCN Checked By Date City of La Quinta Public Works Department - Storm Drain Plan Review Checklist SUBMITTAL REQUIREMENTS Approved Tentative Tract Map Conditions of Approval

### SECTION 5: SANITARY SEWER SYSTEM DESIGN

SECTION 5: SANITARY SEWER SYSTEM DESIGN 5.01 GENERAL Sanitary sewer improvements shall be designed to serve the ultimate level of City development as defined in the General Plan and the Wastewater Facilities

### Module 112. Open Channel Hydraulics.EDC National Employee Development Center. Engineering Hydrology Training Series

Module 112 Open Channel Hydraulics.EDC National Employee Development Center Engineering Hydrology Training Series Module 112-0pen Channel Hydraulics Module Description Overview This module provides background

### Post Construction Stormwater Management Checklist Program

Post Construction Stormwater Management Checklist Program Anahid Damerau, CPESC, CPSWQ Christopher Smith, P.E. Department of Environmental Protection Stormwater Section Watershed Management Program The

### Sample DEQ Plan Submitter s Checklist for Stormwater Management Plans

APPENDIX IV Version: February 2, 2015 Sample DEQ Plan Submitter s Checklist for Stormwater Management Plans Please fill in all blanks and please reference the plan sheets/pages where the information may

### APPENDIX D INLET CAPACITY AND SPACING. The capacity and spacing design of storm drainage inlets are presented in detail in this Appendix.

Storm Drainage 3-D- PPENDIX D INET CPCITY ND SPCING.0 Introduction The capacity and spacing design of storm drainage inlets are presented in detail in this ppendix. 2.0 Design Recurrence Interval and Spread

### Flash Flood Science. Chapter 2. What Is in This Chapter? Flash Flood Processes

Chapter 2 Flash Flood Science A flash flood is generally defined as a rapid onset flood of short duration with a relatively high peak discharge (World Meteorological Organization). The American Meteorological

### 2O-1 Channel Types and Structures

Iowa Stormwater Management Manual O-1 O-1 Channel Types and Structures A. Introduction The flow of water in an open channel is a common event in Iowa, whether in a natural channel or an artificial channel.

### 8.1.3 General Design Guidelines. The following guidelines shall be used when designing inlets along a street section:

. Introduction Presented in this chapter are the criteria and methodology for design and evaluation of storm sewer inlets located in Town of Castle Rock. The review of all planning submittals will be based

### SUSTAINABLE URBAN DRAINAGE SYSTEMS

overflow can lead into a permeable conveyance system to increase further the benefit and reduce the need for pipe systems. Pollutant removal rates have been shown to be high, with some pollutants being

### C.3 Workshop Track 2: Sizing Calculations and Design Considerations for LID Treatment Measures

C.3 Workshop Track 2: Sizing Calculations and Design Considerations for LID Treatment Measures Jill Bicknell, P.E., EOA, Inc. Santa Clara Valley Urban Runoff Pollution Prevention Program Presentation Overview

### RIPRAP From Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas http://www.mass.gov/dep/water/laws/policies.

RIPRAP From Massachusetts Erosion and Sediment Control Guidelines for Urban and Suburban Areas http://www.mass.gov/dep/water/laws/policies.htm#storm Definition: A permanent, erosion-resistant ground cover

### Catchment Scale Processes and River Restoration. Dr Jenny Mant Jenny@therrc.co.uk. The River Restoration Centre therrc.co.uk

Catchment Scale Processes and River Restoration Dr Jenny Mant Jenny@therrc.co.uk The River Restoration Centre therrc.co.uk 3 Main Catchment Elements Hydrology Energy associated with the flow of water affects

### Module 9: Basics of Pumps and Hydraulics Instructor Guide

Module 9: Basics of Pumps and Hydraulics Instructor Guide Activities for Unit 1 Basic Hydraulics Activity 1.1: Convert 45 psi to feet of head. 45 psis x 1 ft. = 103.8 ft 0.433 psi Activity 1.2: Determine

### LECTURE 9: Open channel flow: Uniform flow, best hydraulic sections, energy principles, Froude number

LECTURE 9: Open channel flow: Uniform flow, best hydraulic sections, energy principles, Froude number Open channel flow must have a free surface. Normally free water surface is subjected to atmospheric

### Increasing water availability through juniper control.

Tim Deboodt, OSU Crook County Extension Agent 498 SE Lynn Blvd. Prineville, OR 97754 541-447-6228 Tim.deboodt@oregonstate.edu Increasing water availability through juniper control. Throughout the region

### A perforated conduit such as pipe, tubing or tile installed beneath the ground to intercept and convey ground water. or structures.

BMP: SUBSURFACE DRAIN Definition A perforated conduit such as pipe, tubing or tile installed beneath the ground to intercept and convey ground water. PurRoses 1. To prevent sloping soils from becoming

### Channel Stabilization with Basic Flow Calculations

Channel Stabilization with Basic Flow Calculations Description Selection Criteria The selection of a channel lining will greatly influence how a drainage channel performs, the amount of erosion and scour,

### Storm Drainage Design and Technical Criteria Manual. City of Brookings, SD

Storm Drainage Design and Technical Criteria Manual City of Brookings, SD May, 2006 City of Brookings Storm Drainage Manual Ecological Resource Consultants, Inc. Storm Drainage Design and Technical Criteria

### TECHNICAL MEMORANDUM STORM DRAIN SYSTEM DESIGN EVALUATION CRITERIA. For CITY OF YREKA WILLDAN. July 14, 2006

TECHNICAL MEMORANDUM STORM DRAIN SYSTEM DESIGN & EVALUATION CRITERIA For CITY OF YREKA By WILLDAN July 14, 2006-1 - STORM DRAIN SYSTEM DESIGN & EVALUATION CRITERIA I GENERAL Storm drainage improvements

### CHAPTER 4 STORM DRAINAGE SYSTEMS

CHAPTER 4 STORM DRAINAGE SYSTEMS 4.1 Overview... 4-1 4.1.1 Introduction... 4-1 4.1.2 Inlet Definition... 4-1 4.1.3 Criteria... 4-1 4.2 Pavement Drainage... 4-2 4.2.1 Introduction... 4-2 4.2.2 Storm Drain

### APPENDIX C INLETS. The application and types of storm drainage inlets are presented in detail in this Appendix.

Storm Drainage 13-C-1 APPENDIX C INLETS 1.0 Introduction The application and types of storm drainage inlets are presented in detail in this Appendix. 2.0 Inlet Locations Inlets are required at locations

### ARTICLE II STORM DRAINAGE. (From Ordinance No. 1987-17; August 4, 1987; Sections III through VIII)

ARTICLE II STORM DRAINAGE (From Ordinance No. 1987-17; August 4, 1987; Sections III through VIII) SECTION 2.1 Standard Provisions Standard Provisions All construction for storm drainage in the development

### City of Shelbyville Site Inspection Checklist

City of Shelbyville Site Inspection Checklist General Information Project Name: KYR10 Permit Number: Date: Project Location: Contractor: Conractor Representative: Inspector's Name: Title: Signature : Weather

### Open Channel Flow. M. Siavashi. School of Mechanical Engineering Iran University of Science and Technology

M. Siavashi School of Mechanical Engineering Iran University of Science and Technology W ebpage: webpages.iust.ac.ir/msiavashi Email: msiavashi@iust.ac.ir Landline: +98 21 77240391 Fall 2013 Introduction

### Chapter 13 OPEN-CHANNEL FLOW

Fluid Mechanics: Fundamentals and Applications, 2nd Edition Yunus A. Cengel, John M. Cimbala McGraw-Hill, 2010 Lecture slides by Mehmet Kanoglu Copyright The McGraw-Hill Companies, Inc. Permission required

### OPEN-CHANNEL FLOW. Free surface. P atm

OPEN-CHANNEL FLOW Open-channel flow is a flow of liquid (basically water) in a conduit with a free surface. That is a surface on which pressure is equal to local atmospheric pressure. P atm Free surface

### Burnsville Stormwater Retrofit Study

Burnsville Stormwater Retrofit Study Prepared for City of Burnsville June 2006 4700 West 77 th Street Minneapolis, MN 55435-4803 Phone: (952) 832-2600 Fax: (952) 832-2601 Burnsville Stormwater Retrofit

### 16. Storm water drainage

16. Storm water drainage There are three principal ways to dispose of rainwater from roofs, courtyards and paved areas: storm water sewers, soakaways and collection in storage tanks. Storm water sewers,

### CHAPTER 17: STORM SEWER STANDARDS. 17.00 Introduction. 17.01 Administration. 17.02 Standards 17.1

CHAPTER 17: STORM SEWER STANDARDS 17.00 Introduction 17.01 Administration 17.02 Standards 17.1 17.00 INTRODUCTION The purpose of this chapter is to provide guidance for the design and construction of storm

### Hydraulics Prof. A. K. Sarma Department of Civil Engineering Indian Institute of Technology, Guwahati. Module No. # 02 Uniform Flow Lecture No.

Hydraulics Prof. A. K. Sarma Department of Civil Engineering Indian Institute of Technology, Guwahati Module No. # 02 Uniform Flow Lecture No. # 04 Computation of Uniform Flow (Part 02) Welcome to this

### CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL SECTION 800 STORM SEWER SYSTEMS TABLE OF CONTENTS

CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL SECTION 800 STORM SEWER SYSTEMS TABLE OF CONTENTS 801 INTRODUCTION 803 802 DESIGN PARAMETERS 804 802.1 - Allowable

### 2011 HYDRAULICS MANUAL

STATE OF LOUISIANA DEPARTMENT OF TRANSPORTATION AND DEVELOPMENT P.O. Box 94245 Baton Rouge, Louisiana 70804-9245 http://www.dotd.la.gov/ HYDRAULICS MANUAL Hydraulics (225) 379-1306 PREFACE The following

### Permeable Interlocking Concrete Pavements

Permeable Interlocking Concrete Pavements Program 000003 Revised 1-29-08 Permeable Interlocking Concrete Pavements This program is registered with the AIA/CES and ASLA CPE for continuing education professional

### APPENDIX A: STORMWATER MANAGEMENT CHECKLIST

APPENDIX A: STORMWATER MANAGEMENT CHECKLIST The first thing that applicants and designers must do before beginning a project is to make sure they are familiar with the 11 minimum standards listed in Manual

### Low Impact Development Checklist

New Jersey Stormwater Best Management Practices Manual February 2004 A P P E N D I X A Low Impact Development Checklist A checklist for identifying nonstructural stormwater management strategies incorporated

### Evaluation of Open Channel Flow Equations. Introduction :

Evaluation of Open Channel Flow Equations Introduction : Most common hydraulic equations for open channels relate the section averaged mean velocity (V) to hydraulic radius (R) and hydraulic gradient (S).

### Introduction to Rainwater Harvesting. Department of Biological and Agricultural Engineering Texas A&M University

Introduction to Rainwater Harvesting Department of Biological and Agricultural Engineering Texas A&M University Rainfall in your watershed What is a watershed? An area of land that drains to a common point

### DIVISION OF WATER QUALITY CONSTRUCTION GRANTS & LOANS SECTION FAST TRACK AUDIT CHECKLIST

DIVISION OF WATER QUALITY CONSTRUCTION GRANTS & LOANS SECTION FAST TRACK AUDIT CHECKLIST CERTIFICATION 1. Did the engineer submit a certificate of completion utilizing the appropriate page of the issued

### Pima RDstiChannel DesiggSubmittal

CTY OF SCOTTSDALE DESERT GREENBELT PROJECT Pima RDstiChannel DesiggSubmittal by: The Greiner Team May 1995 VOLUME V 1 [, ~. r. r (, - e. ( - CTY OF SCOTTSDALE DESERT GREENBELT PROJECT Manninlfs Hn //

### Design of open channel

Design of open channel Manning s n Sides slope Seepage losses Evaporation losses Free board Data ssumptions Two unknowns b & Flow rate Q Tpe of soil Longitudinal slope S Meterlogical data (temp., wind...etc.

### Prattsville Berm Removal Project. 1.0 Project Location

Prattsville Berm Removal Project 1.0 Project Location The project site is located between the New York State Route 23 Bridge over the Schoharie Creek and the Schoharie Reservoir. The restoration plan encompassed

### APPENDIX F. RESIDENTIAL WATER QUALITY PLAN: ALLOWABLE BMP OPTIONS

APPENDIX F. RESIDENTIAL WATER QUALITY PLAN: ALLOWABLE BMP OPTIONS The following section provides descriptions, advantages, limitations, and schematics of allowable best management practices (BMPs) for

### DESCRIPTION OF STORMWATER STRUCTURAL CONTROLS IN MS4 PERMITS

DESCRIPTION OF STORMWATER STRUCTURAL CONTROLS IN MS4 PERMITS Phase I MS4 permits require continuous updating of the stormwater system inventory owned and operated by the MS4. They also include inspection

### Construction Site Inspection Checklist for OHC000004 By making use of some simple Best Management Practices (BMPs) a construction site operator can

Construction Site Inspection Checklist for OHC000004 By making use of some simple Best Management Practices (BMPs) a construction site operator can do his or her share to protect Ohio's water resources

SECTION 08000 STORM DRAINAGE 08010 DESIGN A. Location B. Sizing TABLE OF CONTENTS 08020 MATERIALS A. Pipe Materials B. Structure Materials C. Installation D. Inlets and Outlets 08030 INSPECTIONS AND TESTING

### EFFECTS OF ARUNDO DONAX ON RIVER HYDRAULICS, SEDIMENT TRANSPORT, AND GEOMORPHOLOGY, SANTA MARGARITA RIVER, CALIFORNIA

EFFECTS OF ARUNDO DONAX ON RIVER HYDRAULICS, SEDIMENT TRANSPORT, AND GEOMORPHOLOGY, SANTA MARGARITA RIVER, CALIFORNIA René Leclerc Geomorphologist Robert C. MacArthur, Ph.D., P.E. Principal Headwaters

### PERFORMANCE OF DAMS AND SPILLWAYS 2009 GEORGIA FLOOD. Randall P. Bass, P.E. 1, 2. James R. Crowder, P. Joseph S. Monroe, P.E.

PERFORMANCE OF DAMS AND SPILLWAYS 2009 GEORGIA FLOOD Randall P. Bass, P.E. 1, 2 James R. Crowder, P. Joseph S. Monroe, P.E. 3 ABSTRACT During the latter part of September 2009, the Atlanta metro area received

### Porous Pavement Alternatives Cost Analysis

Porous Pavement Alternatives Cost Analysis Prepared by Century West Engineering for Metro This cost analysis compares the construction costs of six different types of pavement for three different scenarios.

### CITY OF CHARLOTTE STORM WATER SERVICES CREDIT APPLICATION INSTRUCTION MANUAL

CITY OF CHARLOTTE STORM WATER SERVICES CREDIT APPLICATION INSTRUCTION MANUAL March 2008 A note to recipients of the Charlotte-Mecklenburg Storm Water Services Credit Application Manual: This is the second

### Drainage Design and Stormwater Pollution Prevention Manual

, Texas Drainage Design and Stormwater Pollution Prevention Manual 2001 Teague Nall and Perkins, Inc. Engineers Consultants Fort Worth Irving Denton CITY OF DESOTO DRAINAGE DESIGN AND STORM WATER POLLUTION

CHAPTER 5 STORMWATER DRAINAGE SYSTEM DESIGN Table of Contents SECTION 5.1 STORMWATER DRAINAGE DESIGN OVERVIEW 5.1.1 Stormwater Drainage System Design...5-1 5.1.1.1 Introduction...5-1 5.1.1.2 Drainage System

### Floodplain Hydraulics! Hydrology and Floodplain Analysis Dr. Philip Bedient

Floodplain Hydraulics! Hydrology and Floodplain Analysis Dr. Philip Bedient Open Channel Flow 1. Uniform flow - Manning s Eqn in a prismatic channel - Q, V, y, A, P, B, S and roughness are all constant