Design of Open-Channel Waterways

Size: px
Start display at page:

Download "Design of Open-Channel Waterways"

Transcription

1 Design of OpenChannel Waterways Open channels can be designed using the concept of maximum permissible depth of flow. The fundamental premise of this approach is that for any selected channel there exist a limiting depth of flow above which scour will occur. Any depth less than the limiting depth is noneroding. This limiting depth is termed the maximum permissible depth of flow. For a particular lining material, the maximum permissible depth of flow is determined by the channel gradient and the erodibility of the underlying soil. Alternately, the design could also be based on the concept of the maximum permissible velocity. Both concepts are connected through the Manning Equation. Design Steps 1. Perform hydrologic computations and select design flows. 2. Estimate soil erodibility. 3. Define type of channel lining material desired. 4. Define channel slope and any restrictions on channel geometry. 5. Determine maximum permissible depth of flow, or maximum permissible velocity of flow, for lining material. 6. Select channel geometry and channel lining suitable for the design flows being considered. 7. Consider other possible factors. Hydrologic Computations Waterways are normally sized to carry the runoff from the 24hour rainfall with a 10year return period. If a vegetative lining is feasible, and a temporary lining is to be used during the establishment period, a lower return period might be considered for the design of the temporary lining. Temporary linings include bare soil, or straw with erosionet. The materials for temporary linings are usually biodegradable.

2 Soil Erodibility Use of the design charts for maximum permissible depth of flow requires specification of the soil erodibility class characteristics of the underlying soil. A soil may be identified as being highly erodible, very erodible, moderately erodible, slightly erodible, or erosion resistant. In general, sandy noncohesive soils tend to be highly erodible, large grained gravelsiltclay mixtures are erosion resistant, and colloids are moderately erodible. Estimates of erodibility class may be based on soil erodibility determinations used in conjunction with the Universal Soil Loss Equation. Channel Lining Material The lining material determines factors such as the hydraulic and scour resistance of the waterway. Choice should be based on economic considerations, such as initial capital outlay, and the cost of labor and machinery required for maintenance. Rock riprap specifications should include not only rock size, thickness of riprap, toe trench dimensions, but also durability, hardness, angularity, and resistance to weathering. Restrictions on Channel Geometry It is important to identify restrictions or constraints that must be placed on channel geometry. The constraints may have the effect of limiting or increasing the size (depth, width, or both) of the channel. On the one hand, the presence of roads, buildings, or established property lines may limit the available space, and hence, restrict the waterway width and/or side slopes. A stable channel design of relatively narrow width and steep side slopes can often be achieved with the use of more rigid lining materials that incorporate some "retaining wall" features (gabion baskets, sheet piling, concrete). On the other hand, for purposes of safety, erosion resistance, construction or maintenance ease, channel side slopes involving flexible linings should be kept relatively flat. For erosion resistance, it is suggested that side slopes be no greater than 3:2 for mediumtextured soils, 1:1 for cohesive welldrained clay, and 4:1 for noncohesive sands. Ideally, side slopes should be 2:1 or flatter for erosion

3 resistance, and still flatter slopes may be necessary for construction or other reasons. Maximum Permissible Depth of Flow, d max. The maximum permissible depth of flow can be determined for selected lining material(s), channel slope(s), and soil erodibility classes (or rock D 50 ) from the table below. Channel Lining Bare soil Straw mulch and erosionet Grass mixture High Retardance Grass mixture Low Retardance Rock riprap D 50 = 0.25 m Rock riprap D 50 = m Maximum permissible depth of flow as a function of channel slope, channel lining, and soil erodibility Maximum permissible depth of flow (ft) Erosion Resistant Soil s s s s Moderately Erodible Soil s s s s s s 1.0 Highly Erodible Soil s s s s If the d max so determined for particular conditions is not compatible with geometry constraints that have been established, a new lining material should be selected. Maximum nonscouring velocities for open channels Maximum permissible velocities on established cover (ft/s) Material Bare Soil Medium grass cover Good grass cover

4 Light silty sand 1.0 Light loose sand Coarse sand Sandy soil 6.5 Firm clay loam Stiff clay or stiff gravelly soil 8.0 Coarse gravels 5.0 Shale, hardpan, soft rock 7.0 Hard cemented comglomerates 8.0 Channel Geometry The channel geometry can now be determined for selected channel lining materials on the basis of factors such as channel slope, water flow rate, and soil erodibility. Parabolic crosssections most closely approximates natural channels. Trapezoidal and triangular crosssections tend to become parabolic over time. This stage of the design involves one step for unlined channels, channels lined with straw mulch, or channels lined with rock riprap. Two steps are necessary for channels lined with grass mixtures. Except for grasslined waterways, crosssectional characteristics can be determined by using the Manning equation. The hydraulic radius, wetted perimeter, and area are all functions of depth. The channel is sized so as to ensure that the flow depth is less than or equal to d max. For channels lined with grass mixtures, waterway dimension should first be determined for conditions when the channel is most susceptible to erosion, that is when the established vegetation is sparse or dormant. This design step provides a stable waterway cross section for the maximum permissible depth of flow occurring on the established vegetative lining in its most vulnerable condition. The second step is then required for the vegetated channel design to determine the depth of flow required to transmit the design flow rate when the grass mixture is

5 mature and dense. In this condition the channel is less susceptible to erosion, but is providing maximum retardance to the water flow. The depth required to carry the design flow over the increased retardance conditions has been termed the depth for design capacity, d cap, and is based on d max. d cap = d max + (d cap d max ) Comparisons of channel geometries for various lining materials allow confirmation of a suitable lining for the design flows considered. Other Design Considerations ^ Freeboard. Most lining materials should extend to the top of the bank or at least 3 ft above the design water level (measured along the slope). ^ Protection in bends. Extra protection from erosion is often required at bends and corners of channels with flexible linings. Where possible, circular curves should be used. ^ Tile outlets. Where drainage tiles outlet into the waterway, both the outlet portion of the tile and the bank surrounding the outlet pipe require special consideration. ^ Construction and maintenance of equipment. A decision on the final size and shape of the waterway should take into account the type of equipment to be used. The channel design may be widened or curved, and the side slopes may be flattened to facilitate construction, maintenance, or both.

GRASS-LINED CHANNEL (acre) CODE 840

GRASS-LINED CHANNEL (acre) CODE 840 NATURAL RESOURCES CONSERVATION SERVICE ILLINOIS URBAN MANUAL PRACTICE STANDARD GRASS-LINED CHANNEL (acre) CODE 840 (Source: NC Erosion and Sediment Control Field Manual) DEFINITION A natural or constructed

More information

Flow Diversion Banks: On earth slopes

Flow Diversion Banks: On earth slopes Flow Diversion Banks: On earth slopes DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1]

More information

Standards for Soil Erosion and Sediment Control in New Jersey May 2012 STANDARD FOR SLOPE PROTECTION STRUCTURES. Definition

Standards for Soil Erosion and Sediment Control in New Jersey May 2012 STANDARD FOR SLOPE PROTECTION STRUCTURES. Definition STANDARD FOR SLOPE PROTECTION STRUCTURES Definition Structures to safely conduct surface runoff from the top of a slope to the bottom of the slope. Purpose The purpose of this practice is to convey storm

More information

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1]

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] Diversion Channels DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1] The design of permanent

More information

LINED WATERWAY OR OUTLET (Feet) Code 468

LINED WATERWAY OR OUTLET (Feet) Code 468 LINED WATERWAY OR OUTLET (Feet) Code 468 Natural Resources Conservation Service Conservation Practice Standard I. Definition A waterway or outlet having an erosion-resistant lining of concrete, stone,

More information

Flow Diversion Banks: On grassed slopes

Flow Diversion Banks: On grassed slopes Flow Diversion Banks: On grassed slopes DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1]

More information

Standards for Soil Erosion and Sediment Control in New Jersey May 2012 STANDARD FOR GRASSED WATERWAYS. Definition. Purpose

Standards for Soil Erosion and Sediment Control in New Jersey May 2012 STANDARD FOR GRASSED WATERWAYS. Definition. Purpose STANDARD FOR GRASSED WATERWAYS Definition A natural or constructed watercourse shaped or graded in earth materials and stabilized with suitable vegetation for the safe conveyance of runoff water. Purpose

More information

Standards for Soil Erosion and Sediment Control in New Jersey May 2012 STANDARD FOR RIPRAP. Conditions Where Practice Applies

Standards for Soil Erosion and Sediment Control in New Jersey May 2012 STANDARD FOR RIPRAP. Conditions Where Practice Applies STANDARD FOR RIPRAP Definition A layer of loose rock, aggregate, bagged concrete, gabions, or concrete revetment blocks placed over an erodible soil surface. Purpose The purpose of riprap is to protect

More information

LOW WATER CROSSINGS, fords, or drifts, as they

LOW WATER CROSSINGS, fords, or drifts, as they Chapter 9 For ords and Low-Water Crossings Keep the ford profile low, armor the driving surface, and protect against scour. LOW WATER CROSSINGS, fords, or drifts, as they are commonly called, can offer

More information

ACTIVITY: Channel Linings ES 22

ACTIVITY: Channel Linings ES 22 Targeted Constituents Significant Benefit Partial Benefit Low or Unknown Benefit Sediment Heavy Metals Floatable Materials Oxygen Demanding Substances Nutrients Toxic Materials Oil & Grease Bacteria &

More information

2-16 EROSION, SEDIMENT & STORM WATER CONTROL REGULATIONS APPENDIX B1

2-16 EROSION, SEDIMENT & STORM WATER CONTROL REGULATIONS APPENDIX B1 2-16 EROSION, SEDIMENT & STORM WATER CONTROL REGULATIONS APPENDIX B1 There are three ways to accomplish urban soil erosion and sedimentation control: Allow erosion to take place and then control sediment

More information

Flow Diversion Banks: General

Flow Diversion Banks: General Flow Diversion Banks: General DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1] Flow diversion

More information

Chapter 7 Water Conveying Conduits

Chapter 7 Water Conveying Conduits Chapter 7 Water Conveying Conduits After the capacity of the water conduit system is known, the type and size of the supply and drainage conduits have to be determined, which is an iterative process. Various

More information

Diversion Dikes. Fe=0.95

Diversion Dikes. Fe=0.95 2.2 Diversion Dike Erosion Control Description: A diversion dike is a compacted soil mound, which redirects runoff to a desired location. The dike is typically stabilized with natural grass for low velocities

More information

Index. outlet protection Rev. 12/93

Index. outlet protection Rev. 12/93 6 Index outlet protection level spreader outlet stabilization structure 6.40.1 6.41.1 Rev. 12/93 Practice Standards and Specifications 6.40 level spreader Definition Purpose Conditions Where Practice Applies

More information

Best Practices for Building High-Performance Resource Roads. Road Drainage. Developed by: The Roads and Infrastructure Group

Best Practices for Building High-Performance Resource Roads. Road Drainage. Developed by: The Roads and Infrastructure Group Best Practices for Building High-Performance Resource Roads Road Drainage Developed by: The Roads and Infrastructure Group THIS GUIDE IS INTENDED FOR EQUIPMENT OPERATORS CONSTRUCTION CONTRACTORS FIELD

More information

Lake Lorelei Property Owners Association Rip Rap Standards Recommendations. Revision 0 February 2018

Lake Lorelei Property Owners Association Rip Rap Standards Recommendations. Revision 0 February 2018 Lake Lorelei Property Owners Association Rip Rap Standards Recommendations Revision 0 February 2018 Table of contents Purpose and scope Selecting streambank and shoreline protection measures Rip Rap Installation

More information

Highway Drainage 1- Storm Frequency and Runoff 1.1- Runoff Determination

Highway Drainage 1- Storm Frequency and Runoff 1.1- Runoff Determination Highway Drainage Proper drainage is a very important consideration in design of a highway. Inadequate drainage facilities can lead to premature deterioration of the highway and the development of adverse

More information

[1] Level spreaders can release sheet flow down steep slopes, but the level spreader itself must be constructed across a level gradient.

[1] Level spreaders can release sheet flow down steep slopes, but the level spreader itself must be constructed across a level gradient. Level Spreaders DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient [1] Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] Level spreaders can release

More information

EART 204. Water. Dr. Slawek Tulaczyk. Earth Sciences, UCSC

EART 204. Water. Dr. Slawek Tulaczyk. Earth Sciences, UCSC EART 204 Water Dr. Slawek Tulaczyk Earth Sciences, UCSC 1 Water is an amazing liquid, (high heat capacity - particularly in phase transitions, maximum density at ca. 4 deg. C) 2 3 4 5 6 7 8 9 Basin Hydrologic

More information

Constructed Wetland Channel T-9

Constructed Wetland Channel T-9 Description A constructed wetland channel is a conveyance BMP that is built, in part, to enhance stormwater quality. Constructed wetland channels use dense vegetation to slow down runoff and allow time

More information

Temporary Watercourse Crossing: Fords

Temporary Watercourse Crossing: Fords Temporary Watercourse Crossing: Fords DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1]

More information

Ponds: planning, design, and construction

Ponds: planning, design, and construction Ponds: planning, design, and construction Ponds for many purposes: Fish Production Recreation Water Supply Esthetics Wildlife Habitat Natural ponds: Formed in natural depressions in the landscape Not man-made

More information

Grass Channel STORMWATER MANAGEMENT SUITABILITY KEY CONSIDERATIONS

Grass Channel STORMWATER MANAGEMENT SUITABILITY KEY CONSIDERATIONS 4.0 Structural Stormwater Control Description: Vegetated open channels designed to filter stormwater runoff and meet velocity targets for the water quality design storm and the Streambank Protection storm

More information

Prepared for Urban Drainage and Flood Control District

Prepared for Urban Drainage and Flood Control District BERM FAILURE TECHNICAL ANALYSES SOUTH PLATTE GRAVEL PIT EVALUATION CRITERIA Prepared for Urban Drainage and Flood Control District Wright Water Engineers, Inc. January 2013 121-030.000 TABLE OF CONTENTS

More information

Drop Height For Channel Erosion Control

Drop Height For Channel Erosion Control Drop Height For Channel Erosion Control James C.Y. Guo, Professor and Director Department of Civil Engineering, U. of Colorado at Denver, Denver, Colorado 8017 E-mail: James.Guo@cudenver.edu Introduction

More information

Temporary Stream Crossing

Temporary Stream Crossing Categories EC Erosion Control SE Sediment Control TC Tracking Control WE Wind Erosion Control Non-Stormwater NS Management Control Waste Management and WM Materials Pollution Control Legend: Primary Objective

More information

Temporary Stream Crossing

Temporary Stream Crossing Temporary Stream Crossing NS-4 Objectives EC Erosion Control SE Sediment Control TR Tracking Control WE Wind Erosion Control Non-Stormwater NS Management Control Waste Management and WM Materials Pollution

More information

Written by: Lindsay O Leary Date: 11 /08 /26 Reviewed by: Brandon Klenzendorf Date: 11 /08 /26 YY MM DD YY MM DD

Written by: Lindsay O Leary Date: 11 /08 /26 Reviewed by: Brandon Klenzendorf Date: 11 /08 /26 YY MM DD YY MM DD Page 2 of 21 Written by: Lindsay O Leary Date: 11 /08 /26 Reviewed by: Brandon Klenzendorf Date: 11 /08 /26 YY MM DD YY MM DD Client: Malcolm Pirnie, Inc. Project: ASARCO El Paso Site Project/Proposal

More information

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control [1] Soil Treatment Permanent

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control [1] Soil Treatment Permanent Slope Drains DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control [1] Soil Treatment Permanent [1] Slope drains can act as outlet

More information

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control [1] Soil Treatment Permanent

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control [1] Soil Treatment Permanent Slope Drains DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control [1] Soil Treatment Permanent [1] Slope drains can act as outlet

More information

Catch Drains Part 4: Geotextile-lined

Catch Drains Part 4: Geotextile-lined Catch Drains Part 4: Geotextile-lined DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1]

More information

Appendix D. Erosion Management Sub- Plan

Appendix D. Erosion Management Sub- Plan Appendix D Erosion Management Sub- Plan DRENNAN SOLAR ENERGY FACILITY EROSION MANAGEMENT PLAN PRODUCED FOR ERM ON BEHALF OF SOLAIREDIRECT BY Simon.Todd@3foxes.co.za JUNE 2013 PURPOSE The purpose of the

More information

SURFACE DRAINAGE SYSTEM FOR ROADS. Components of Surface Drainage System

SURFACE DRAINAGE SYSTEM FOR ROADS. Components of Surface Drainage System Lecture Hour-49 UNIT 8 10CV755 HGD SURFACE DRAINAGE SYSTEM FOR ROADS Components of Surface Drainage System The surface water from the roadway and the adjoining land is to be collected and then disposed

More information

HYDROLOGIC AND HYDRAULIC TABLES AND CURVES

HYDROLOGIC AND HYDRAULIC TABLES AND CURVES APPENDIX C HYDROLOGIC AND HYDRAULIC TABLES AND CURVES PRECIPITATION TABLES Table C-1, page C-2, provides local data for use in designing drainage systems as discussed in Chapter 6. HYDROLOGIC SUPPLY CURVES

More information

10(a) Bridge and culvert design information

10(a) Bridge and culvert design information 10(a) Bridge and culvert design information The following information is required to accompany resource consent applications for bridges or culverts on waterways. Please answer all questions if possible.

More information

Awareness Training. Overview of Proposed Changes. John Showler, P.E. NJDA-SSCC

Awareness Training. Overview of Proposed Changes. John Showler, P.E. NJDA-SSCC Awareness Training Overview of Proposed Changes John Showler, P.E. NJDA-SSCC December 12, 2012 Revised review process in the Governor s office added to timeline (was not present in 1999) Several revised

More information

BMP-17. To provide for the conveyance of concentrated surface runoff water to a receiving channel or system without damage from erosion.

BMP-17. To provide for the conveyance of concentrated surface runoff water to a receiving channel or system without damage from erosion. BMP-17 BMP: STORMWATER CONVEYANCE CHANNEL Definition A permanent, designed waterway, shaped, sized, and lined with appropriate vegetation or structural material used to safely convey stormwater runoff

More information

DRAINAGE & DESIGN OF DRAINAGE SYSTEM

DRAINAGE & DESIGN OF DRAINAGE SYSTEM Drainage on Highways DRAINAGE & DESIGN OF DRAINAGE SYSTEM P. R.D. Fernando Chartered Engineer B.Sc.(Hons), M.Eng. C.Eng., MIE(SL) Drainage Requirement of Highway Drainage System Introduction Drainage means

More information

Module 7: Hydraulic Design of Sewers and Storm Water Drains. Lecture 7: Hydraulic Design of Sewers and Storm Water Drains

Module 7: Hydraulic Design of Sewers and Storm Water Drains. Lecture 7: Hydraulic Design of Sewers and Storm Water Drains Module 7: Hydraulic Design of Sewers and Storm Water Drains Lecture 7: Hydraulic Design of Sewers and Storm Water Drains 7.0 HYDRAULIC DESIGN OF SEWERS AND STORM WATER DRAINS 7.1 General Consideration

More information

Organic Filter Tubes. Fe= (Depends on soil type)

Organic Filter Tubes. Fe= (Depends on soil type) 3.6 Sediment Control Description: Organic filter tubes are comprised of an open weave, mesh tube that is filled with a filter material (compost, wood chips, straw, coir, aspen fiber, or a mixture of materials).

More information

CHAPTER 8 SEEPAGE CONTROL IN EMBANKMENTS

CHAPTER 8 SEEPAGE CONTROL IN EMBANKMENTS CHAPTER 8 SEEPAGE CONTROL IN EMBANKMENTS 8-1. General. All earth and rock-fill dams are subject to seepage through the embankment, foundation, and abutments. Seepage control is necessary to prevent excessive

More information

Dry Swale Wet Swale Grass Channel Dry Well Permeable Pavement Bioretention DESIGN ELEMENTS

Dry Swale Wet Swale Grass Channel Dry Well Permeable Pavement Bioretention DESIGN ELEMENTS FACILITY ID: DATE: / / ASSESSED BY: NAME: ADDRESS: PHOTO IDS: SECTION 1- BACKGROUND INFORMATION (GIS) BMP TYPE : Dry Detention Pond Extended Detention Pond Wet Pond Filter (specify: ) Infiltration (specify:

More information

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1]

Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] Energy Dissipaters DRAINAGE CONTROL TECHNIQUE Low Gradient Velocity Control Short Term Steep Gradient Channel Lining Medium-Long Term Outlet Control Soil Treatment Permanent [1] [1] The design of permanent

More information

Development of a Stream Rating Curve

Development of a Stream Rating Curve Development of a Stream Rating Curve Luis F. Andino Galeano landino@illinois.edu Abstract. Understanding the characteristics of streams is necessary to design and apply methods to achieve a sustainable

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

Ponds. Pond A water impoundment made by excavating a pit, or constructing a dam or an embankment.

Ponds. Pond A water impoundment made by excavating a pit, or constructing a dam or an embankment. POND SITE SELECTION AND CONSTRUCTION Uses, Planning, & Design David Krietemeyer Area Engineer USDA-NRCS June 20, 2008 Uses Considerations for Location of Commonly Used Terms Pond A water impoundment made

More information

Geotechnical Investigation Long Timber Brewing Building Highway 99 and Kelly Street Monroe, Oregon TABLE OF CONTENTS

Geotechnical Investigation Long Timber Brewing Building Highway 99 and Kelly Street Monroe, Oregon TABLE OF CONTENTS Highway 99 and Kelly Street TABLE OF CONTENTS PROJECT INFORMATION... 1 FIELD EXPLORATION... 1 SITE CONDITIONS... 2 Surface Conditions:... 2 Subsurface Conditions:... 2 FILL.... 2 Topsoil.... 2 Clay Alluvium....

More information

0.0. Pervious CN = 40. (Unconnected impervious) (Total impervious) Total impervious area (percent) Composite CN

0.0. Pervious CN = 40. (Unconnected impervious) (Total impervious) Total impervious area (percent) Composite CN Figure 2-3 Composite CN with connected impervious area. 100 Composite CN 90 80 70 60 Pervious CN = 90 80 70 60 50 40 50 40 0 10 20 30 40 50 60 70 80 90 100 Connected impervious area (percent) Figure 2-4

More information

Interpretations and Management of Soil

Interpretations and Management of Soil Interpretations and Management of Soil Lesson 12: Interpretations and Management of Soil The first steps in evaluating soils involve learning how to identify horizons and site characteristics, and how

More information

EEEEEE. ARWMmmMINU NTMNWiS ENPUINENT STATION VICKS8URO NS HYDRA. (U) AND DENOSThNTIO.. MUIION 7WM.7SSFFIJD R SWAT ETAL.RPR79 ESAAL- PF/ 13/2 11.

EEEEEE. ARWMmmMINU NTMNWiS ENPUINENT STATION VICKS8URO NS HYDRA. (U) AND DENOSThNTIO.. MUIION 7WM.7SSFFIJD R SWAT ETAL.RPR79 ESAAL- PF/ 13/2 11. 4Fm EEEEEE SECTION MUIION n2 PROGA AND DENOSThNTIO.. stumsmu (U) iroslm ARWMmmMINU COm. vi NTMNWiS ENPUINENT STATION VICKS8URO NS HYDRA. 7WM.7SSFFIJD R SWAT ETAL.RPR79 ESAAL- PF/ 13/2 11. .......... 1........

More information

EC-04 ROLLED EROSION CONTROL PRODUCTS (RECP)

EC-04 ROLLED EROSION CONTROL PRODUCTS (RECP) Greenville County Technical Specification EC-04 ROLLED EROSION CONTROL PRODUCTS (RECP) 1.0 Rolled Erosion Control Products (RECP) 1.1 Description A variety of Rolled Erosion Control Products (RECP) are

More information

SECTION EROSION CONTROLS

SECTION EROSION CONTROLS SECTION 31 25 13 EROSION CONTROLS PART 1 GENERAL 1.1 SUMMARY A. Section Includes installing, maintaining and removing: 1. Silt Fence. 2. Temporary Construction Entrances. 3. Diversion Channels. 4. Sediment

More information

1.2 REGULATORY REQUIREMENTS

1.2 REGULATORY REQUIREMENTS Table 1.1. Soil textural classes and general terminology used in soil descriptions (Source: US Environmental Protection Agency 1977). Name Texture Basic soil textural common class names Sandy soils Coarse

More information

Module 7: Hydraulic Design of Sewers and Storm Water Drains. Lecture 7 : Hydraulic Design of Sewers and Storm Water Drains

Module 7: Hydraulic Design of Sewers and Storm Water Drains. Lecture 7 : Hydraulic Design of Sewers and Storm Water Drains 1 P age Module 7: Hydraulic Design of Sewers and Storm Water Drains Lecture 7 : Hydraulic Design of Sewers and Storm Water Drains 2 P age 7.1 General Consideration Generally, sewers are laid at steeper

More information

DESIGN OF ROADSIDE CHANNELS WITH FLEXIBLE LININGS

DESIGN OF ROADSIDE CHANNELS WITH FLEXIBLE LININGS AD-A205 702 - - f;) f lydraulic [ngineering Circular No. 15 US Department of Transportation Publication No. -ItWA-IP-87-7 Federal Highway April 1988 Administration DTIC electe DESIGN OF ROADSIDE CHANNELS

More information

TDOT DESIGN DIVISION DRAINAGE MANUAL CHAPTER V ROADSIDE DITCHES & STREAMS

TDOT DESIGN DIVISION DRAINAGE MANUAL CHAPTER V ROADSIDE DITCHES & STREAMS TDOT DESIGN DIVISION DRAINAGE MANUAL CHAPTER V ROADSIDE DITCHES & STREAMS CHAPTER 5 ROADSIDE DITCHES AND STREAMS SECTION 5.01 INTRODUCTION 5.01 INTRODUCTION... 5-1 SECTION 5.02 DOCUMENTATION PROCEDURES

More information

HISTORY OF CONSTRUCTION 40 CFR (c)(1)(i)-(xii) PLANT WANSLEY ASH POND (AP-1) GEORGIA POWER COMPANY. Carrollton, Georgia 30116

HISTORY OF CONSTRUCTION 40 CFR (c)(1)(i)-(xii) PLANT WANSLEY ASH POND (AP-1) GEORGIA POWER COMPANY. Carrollton, Georgia 30116 (i) Site Name and Ownership Information: HISTORY OF CONSTRUCTION 40 CFR 257.73(c)(1)(i)-(xii) PLANT WANSLEY ASH POND (AP-1) GEORGIA POWER COMPANY Site Name: Site Location: Site Address: Owner: Owner Address:

More information

Sediment Basin. Fe= (Depends on soil type)

Sediment Basin. Fe= (Depends on soil type) 3.9 Sediment Control Description: A sediment basin is an embankment with a controlled outlet that detains stormwater runoff, resulting in the settling of suspended sediment. The basin provides treatment

More information

SECTION EROSION CONTROL DEVICES

SECTION EROSION CONTROL DEVICES SECTION 02374 PART 1 GENERAL EROSION CONTROL DEVICES 1.1 SUMMARY A. Section Includes: 1. Diversion Channels. 2. Rock Energy Dissipator. 3. Paved Energy Dissipator. 4. Rock Basin. 5. Rock Barriers. 6. Sediment

More information

FIELD PHOSPHORUS RISK ASSESSMENT

FIELD PHOSPHORUS RISK ASSESSMENT NEBRASKA DEPARTMENT OF ENVIRONMENTAL QUALITY AGRICULTURE SECTION * 1200 N STREET, SUITE 400 * LINCOLN, NE 68509-8922 TEL: (402)471-4239 *FAX: (402) 471-2909 * WEB SITE: www.ndeq.state.ne.us APPENDIX F

More information

Non-Vegetative Stabilization

Non-Vegetative Stabilization Categories EC Erosion Control SE Sediment Control TR Tracking Control WE Wind Erosion Control NS Non-Stormwater Management Control WM Waste Management and Materials Pollution Control Legend: Primary Category

More information

SOILS INFORMATION FOR GEORGIA

SOILS INFORMATION FOR GEORGIA APPENDIX SOILS INFORMATION FOR GEORGIA (Source: Manual for Erosion and Sediment Control in Georgia, Fifth Edition, 2000) B Appendix B-1 SOILS INFORMATION The soils information in Appendix B has been assembled

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

Excavation &Trenching

Excavation &Trenching Excavation &Trenching The Hazards of Excavation and Trenching and How to Control Them Whitman College Department of Environmental Health & Safety and the Washington State Department of Labor & Industries

More information

Highway Surface Drainage

Highway Surface Drainage Highway Surface Drainage R obert D. M iles, Research Engineer Joint Highway Research Project, and Assistant Professor of Highway Engineering, School of Civil Engineering Purdue University IN T R O D U

More information

Surface flow - above ground

Surface flow - above ground SAICE (R&H) - Short Course: Drainage II Surface Flow May 2011 Surface flow - above ground 1 A Proper Surface Drain System Should: 1. Prevent or restrict water from entering substructure 2. Discharge water

More information

Misan University - College of Engineering Civil Engineering Department

Misan University - College of Engineering Civil Engineering Department CHAPTER 2 Soil and Excavations Soil investigation including two phases: surface investigation and subsurface investigation Surface investigation involves making a preliminary judgment about the site s

More information

Grassed Waterway Improvement and Gully Restoration

Grassed Waterway Improvement and Gully Restoration Revised April 2007 Agdex 573-5 Grassed Waterway Improvement and Gully Restoration Each year, tonnes of topsoil are eroded from localized areas on some Alberta farms. This loss is serious for several reasons:

More information

LAYING IBSTOCK CLAY PAVERS FOR PERMEABLE PAVEMENTS

LAYING IBSTOCK CLAY PAVERS FOR PERMEABLE PAVEMENTS PERMEABLE PAVEMENTS (SUDS) This leaflet highlights the basic requirements for laying Ibstock clay pavers to form a permeable pavement. Ibstock clay pavers are intended for domestic use only i.e. patios

More information

Training on Roads for Water and Resilience

Training on Roads for Water and Resilience Training on Roads for Water and Resilience 1 DRAINAGE FROM UNPAVED ROADS Outline 3 1. 2. 3. 4. 5. 6. 7. Introduction Important considerations Drainage management Surface drainage features Subsurface drainage

More information

Typical Local Erosion Control Requirements (Storm Water Management Authority, Inc.)

Typical Local Erosion Control Requirements (Storm Water Management Authority, Inc.) Module 2: Selection of Controls and Site Planning for Construction Site Erosion Prevention Robert Pitt Department of Civil, Construction, and Environmental Engineering University of Alabama Tuscaloosa,

More information

SE-6 GRAVEL BAG BERM. Objectives. Potential Alternatives

SE-6 GRAVEL BAG BERM. Objectives. Potential Alternatives Objectives Erosion Control - EC Sediment Control - SE Tracking Control - TC Wind Erosion Control - WE Non-Storm Water Management - NS Materials and Waste Management - WM DESCRIPTION AND PURPOSE A gravel

More information

APPENDIX B PROJECT DESCRIPTION AND ALTERNATIVE ANALYSIS

APPENDIX B PROJECT DESCRIPTION AND ALTERNATIVE ANALYSIS APPENDIX B PROJECT DESCRIPTION AND ALTERNATIVE ANALYSIS INTRODUCTION The Chesapeake Energy Center (Station), owned and operated by Virginia Electric and Power Company dba Dominion Virginia Power (Dominion),

More information

Session A6- Mannings "n" roughness characteristic occurring in semi-smooth turbulent flow of nature- Iike fishways

Session A6- Mannings n roughness characteristic occurring in semi-smooth turbulent flow of nature- Iike fishways University of Massachusetts - Amherst ScholarWorks@UMass Amherst International Conference on Engineering and Ecohydrology for Fish Passage International Conference on Engineering and Ecohydrology for Fish

More information

Low Impact Development Construction, Inspection & Maintenance Field Handbook Edition 1.0 September 2016

Low Impact Development Construction, Inspection & Maintenance Field Handbook Edition 1.0 September 2016 Low Impact Development Construction, Inspection & Maintenance Field Handbook Edition 1.0 September 2016 LID Construction, Inspection and Maintenance Field Handbook I City of Edmonton LID Construction,

More information

Construction Site Inspections

Construction Site Inspections Construction Site Inspections Keep The Mud Out of The Creek Barry Tonning, Tetra Tech Inspections help to identify and correct problems! Inspection requirements Must inspect site every 14 days (LA) Some

More information

NATURAL RESOURCES CONSERVATION SERVICE ILLINOIS URBAN MANUAL PRACTICE STANDARD SUBSURFACE DRAIN. (ft.) CODE 945

NATURAL RESOURCES CONSERVATION SERVICE ILLINOIS URBAN MANUAL PRACTICE STANDARD SUBSURFACE DRAIN. (ft.) CODE 945 NATURAL RESOURCES CONSERVATION SERVICE ILLINOIS URBAN MANUAL PRACTICE STANDARD SUBSURFACE DRAIN (ft.) CODE 945 (Source: MN Protecting Water Quality in Urban Areas) DEFINITION A conduit, such as corrugated

More information

Welded Mesh Gabions and Mattresses River Protection Design Guide Anping County Zhuoda Hardware Mesh Co.,Ltd. Wire Mesh Industrial Zone, Anping

Welded Mesh Gabions and Mattresses River Protection Design Guide Anping County Zhuoda Hardware Mesh Co.,Ltd. Wire Mesh Industrial Zone, Anping Welded Mesh Gabions and Mattresses River Protection Design Guide Anping County Zhuoda Hardware Mesh Co.,Ltd. Wire Mesh Industrial Zone, Anping County, Hebei, P. R. China. Tel : 0086-318-7752001 7531068

More information

SECTION 4 STORM DRAINAGE

SECTION 4 STORM DRAINAGE 4.01 GENERAL SECTION 4 STORM DRAINAGE These standards shall provide minimum requirements for the design of Storm Drainage and related appurtenances within the City of West Sacramento rights of way and

More information

2017 VTAS&S. APPENDIX C Virginia Tech Stormwater Design Manual

2017 VTAS&S. APPENDIX C Virginia Tech Stormwater Design Manual APPENDIX C Virginia Tech Stormwater Design Manual Table of Contents 1.0 Stormwater Hydrology...1 1.1 References...1 1.2 Design Frequencies...1 1.2.1 General...1 1.2.2 Storm Drainage Systems...1 1.3 Stormwater

More information

Faculty of Applied Science and Engineering. Department of Civil Engineering. Hydrology and Hydraulics. Final Exam, April 21, 2017

Faculty of Applied Science and Engineering. Department of Civil Engineering. Hydrology and Hydraulics. Final Exam, April 21, 2017 F Name: Student #: University of Toronto Faculty of Applied Science and Engineering Department of Civil Engineering C1V250 - Hydrology and Hydraulics Final Exam, April 21, 2017 Duration: 2 and V2 hrs The

More information

CITY UTILITIES DESIGN STANDARDS MANUAL

CITY UTILITIES DESIGN STANDARDS MANUAL CITY UTILITIES DESIGN STANDARDS MANUAL () September 2017 Page Chapter 1 Acronyms and Definitions 1.01 Purpose 1 1.02 Acronyms 1 1.03 Definitions 3 Chapter 2 Introduction 2.01 Purpose 1 2.02 Applicability

More information

Development and Use of HYCHL for Channel Design

Development and Use of HYCHL for Channel Design 8 TRANSPORTATION RESEARCH RECORD 1350 Development and Use of HYCHL for Channel Design ROGER T. KILGORE AND KENNETH w. SNODGRASS The HYCHL program is introduced and ways it is an enhanced combination of

More information

Treatment Volume: Curve Numbers. Composite CN or Not? Treatment Volume: Curve Numbers. Treatment Volume: Calculation. Treatment Volume: Calculation

Treatment Volume: Curve Numbers. Composite CN or Not? Treatment Volume: Curve Numbers. Treatment Volume: Calculation. Treatment Volume: Calculation Stormwater Engineering Bioretention Design Bill Hunt, PE, Ph.D. Extension Specialist & Assistant Professor NCSU-BAE www.bae.ncsu.edu/stormwater Bioretention Design Six Step Process 1 Determine Volume to

More information

Ohio Department of Transportation Division of Production Management Office of Geotechnical Engineering. Geotechnical Bulletin

Ohio Department of Transportation Division of Production Management Office of Geotechnical Engineering. Geotechnical Bulletin Ohio Department of Transportation Division of Production Management Office of Geotechnical Engineering Geotechnical Bulletin GB 2 SPECIAL BENCHING AND SIDEHILL EMBANKMENT FILLS Geotechnical Bulletin GB2

More information

Channel Stabilization (CS)

Channel Stabilization (CS) Channel Stabilization (CS) Practice Description Channel stabilization is stabilizing a channel, either natural or artificial, in which water flows with a free surface. The purpose of this practice is to

More information

TRENCHING AND EXCAVATION

TRENCHING AND EXCAVATION TRENCHING AND EXCAVATION The following guide is an aid intended for students who have completed the ClickSafety training course or module associated with Trenching and Excavation. This guide is a resource

More information

Brush layering construction

Brush layering construction Brush layering construction Brush layering consists of embedding live branches on successive horizontal rows along contours on the face of a slope. Rooted plants can also be placed among the live branches.

More information

ILLINOIS URBAN MANUAL PRACTICE STANDARD TEMPORARY STREAM CROSSING (no.) CODE 975. Source: Hey and Associates, Inc.

ILLINOIS URBAN MANUAL PRACTICE STANDARD TEMPORARY STREAM CROSSING (no.) CODE 975. Source: Hey and Associates, Inc. ILLINOIS URBAN MANUAL PRACTICE STANDARD TEMPORARY STREAM CROSSING (no.) CODE 975 Source: Hey and Associates, Inc. DEFINITION A bridge or culvert crossing installed across a stream or watercourse for short-term

More information

Coal Combustion Facility Assessment Report. October 20, 2010

Coal Combustion Facility Assessment Report. October 20, 2010 Coal Combustion Facility Assessment Report October 20, 2010 Introduction Stantec Consulting Services Inc. North American Consulting Firm 10,000 Engineers, Geologists, Architects, Scientists and Technicians

More information

NOVEMBER 2016 GRANDWALL. retaining walls installation guide

NOVEMBER 2016 GRANDWALL. retaining walls installation guide NOVEMBER 2016 GRANDWALL retaining walls installation guide RETAINING WALL INSTALLATION GUIDE RETAINING WALL information Austral Masonry Grandwall retaining wall blocks are an ideal choice for retaining

More information

Chapter 4. Main problems in a canal network 4.1 INTRODUCTION

Chapter 4. Main problems in a canal network 4.1 INTRODUCTION Canals 21 Chapter 4 4.1 INTRODUCTION This chapter looks at problems which are frequently encountered in irrigation canal systems. Some of these are described in detail. The last section of this chapter

More information

1993 SPECIFICATIONS CSJ SPECIAL SPECIFICATION ITEM 4110 CONCRETE ENCASED DUCT BANK

1993 SPECIFICATIONS CSJ SPECIAL SPECIFICATION ITEM 4110 CONCRETE ENCASED DUCT BANK 1993 SPECIFICATIONS CSJ 581-1-95 SPECIAL SPECIFICATION ITEM 4110 CONCRETE ENCASED DUCT BANK 1. DESCRIPTION. This Item shall govern for the furnishing and installation of all materials and equipment for

More information

Technical Memorandum

Technical Memorandum Tucson Office 3031 West Ina Road Tucson, AZ 85741 Tel 520.297.7723 Fax 520.297.7724 www.tetratech.com Technical Memorandum To: Kathy Arnold From: Greg Hemmen, P.E. Company: Rosemont Copper Company Date:

More information

BLOCKING AND FILLING SURFACE DRAINAGE DITCHES

BLOCKING AND FILLING SURFACE DRAINAGE DITCHES MINNESOTA WETLAND RESTORATION GUIDE BLOCKING AND FILLING SURFACE DRAINAGE DITCHES TECHNICAL GUIDANCE DOCUMENT Document No.: WRG 4A-1 Publication Date: 10/14/2015 Table of Contents Introduction Application

More information

Groundwater Mounding Causes, Issues and Prevention

Groundwater Mounding Causes, Issues and Prevention Groundwater Mounding Causes, Issues and Prevention WCOWMA - Onsite Wastewater Association of BC 2017 Annual Convention and Tradeshow March 11, 2017 Presented by Daniel Watterson, P.Geo., LHG Watterson

More information

PROJECT SCREENING MATRIX: A User s Guide

PROJECT SCREENING MATRIX: A User s Guide Version 2.0 Page 1 of 7 November 9, 2010 PROJECT SCREENING MATRIX: A User s Guide BACKGROUND The Project Screening Matrix (Screening Matrix) is one of several tools that comprise the River Restoration

More information

Chapter 2: Selecting Best Management Practices (BMPs)

Chapter 2: Selecting Best Management Practices (BMPs) Chapter 2: Selecting Best Management Practices (BMPs) 2.1 - Temporary versus Permanent BMPs The same level of care should be taken to select both temporary BMPs and permanent BMPs. The same level of care

More information

freestone eco Prestige & quality DIY vertical wall Large blocks - 10/m 2 Smooth surface finish No concrete footings

freestone eco Prestige & quality DIY vertical wall Large blocks - 10/m 2 Smooth surface finish No concrete footings freestone eco Retaining Wall SystemTM The Freestone ECO Retaining Wall System TM is a more sustainable DIY, vertical retaining wall which is manufactured with up to 40% recycled glass aggregate to provide

More information