CHAPTER 9. Outlet Protection

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "CHAPTER 9. Outlet Protection"

Transcription

1 CHAPTER 9 Outlet Protection

2 General Considerations Not an ABACT, but should be used in all watersheds to prevent erosion due to concentrated discharges For channel or swale, use guidance for pipe with equivalent cross-sectional area & design discharge to channel or swale

3 Pipe Not Flowing Full For pipe flowing full, continuity equation typically used to determine capacity & flow velocity: Q = VA When pipe is not flowing full, different procedure should be used to determine velocity Due to increased friction that occurs along the wetted perimeter, full flow does not = greatest flow capacity For circular pipes, peak flow occurs at 93% of total inside diameter Likewise, average velocity of pipe flowing ½ full = that for one flowing full Anticipated velocity should be determined either by Manning s equation for circular channels, standard design nomographs, or by use of Figure 9.1 (limited to pipes with gradients <0.05 ft/ft)

4 Figure 9.1 NOTE: Do not use this nomograph to determine equivalent pipe sizes for discharges (Qd) which do not intersect curves corresponding to proposed pipe sizes on Figures 9.3 and 9.4

5 Riprap Aprons May be used to prevent scour at pipe or channel outfalls where: Anticipated discharge velocities < 17.0 fps Sufficient room to construct apron Aprons can be installed on level grade Where discharge velocities > 17.0 fps, suitable means of velocity reduction (e.g. drop structure) to be used prior to discharging significant flows onto riprap apron

6 Riprap Aprons To be oriented so discharge enters receiving channel at < 90 O to channel flow direction (see Figure 9.2) In no case should discharge enter channel at angle > 90 O to channel flow direction

7 Figure 9.2 Proper Outfall Orientation to Receiving Stream *Chapter 105 permit(s) required. Provide sediment barrier to protect stream and outfall channels

8 Riprap Aprons To be constructed according to dimensions shown in SCD# 9-1 (for outfalls having an endwall) or SCD# 9-2 (for outfalls with no endwall) For discharge directly into stream flowing away from pipe, use SCD# 9-3 Aprons to be constructed at or near zero grade from back to front & side to side Where constructed with gradient back to front, rock size and/or apron length to be adjusted upwards to compensate Aprons not to be constructed with back to front gradient > 0.05 ft/ft

9 Max or Min Tailwater Min Tailwater - depth of flow in receiving watercourse, as calculated by Manning s equation, < ½ diameter of discharge pipe, or where no channel or swale exists at point of discharge Use Figure 9.3 If resulting apron width wider than existing channel width & discharge is directly into downslope channel (SCD# 9-3), use channel width as width of apron Max Tailwater - depth of flow in receiving watercourse, as calculated by Manning s equation, > ½ diameter of discharge pipe Use Figure 9.4 If resulting apron width wider than existing channel width & discharge is directly into downslope channel (SCD# 9-3), use channel width as width of apron Figure 9.3 & 9.4 not to be used for designing outlet protection below Box Culverts

10 High Velocities & Low Flows If discharge velocity > max allowable (Table 6.6) for riprap size taken from Figure 9.3 or 9.4, size of riprap should be increased to size whose permissible velocity is not exceeded If velocity exceeds max permissible for riprap (i.e fps), a suitable method of reducing velocity prior to discharge onto rock (e.g. drop structure or dissipater) should be used If design Q does not intersect curve for pipe diameter, use lowest point on that curve to determine apron dimensions (Do not extrapolate)

11 Grouting Riprap Not recommended for most installations Where riprap is grouted, following applies: Precautions to be taken to prevent uncured concrete from coming into contact with any surface waters Grout to be placed in layer with thickness = d50 stone size over entire extent of apron prior to rock placement After stone placement, void spaces to be filled with grout

12 Standard Construction Detail # 9-1 Riprap Apron at Pipe Outlet with Flared End Section or Endwall

13 SCD# 9-1Notes Construct all aprons to dimensions shown Adjust terminal widths as necessary to match receiving channels Inspect all aprons weekly & after each runoff event Replace displaced riprap within apron immediately

14 Standard Construction Detail # 9-2 Riprap Apron at Pipe Outlet without Flared Endwall

15 SCD# 9-2 Notes Construct all aprons to dimensions shown Adjust terminal widths as necessary to match receiving channels Extend riprap on back side of apron to at least ½ depth of pipe on both sides to prevent scour around pipe Inspect all aprons weekly & after each runoff event Replace displaced riprap within apron immediately

16 Standard Construction Detail # 9-3 Riprap Apron at Pipe Discharge to an Existing Channel

17 SCD# 9-3 Notes Construct all aprons to dimensions shown Adjust terminal widths as necessary to match receiving channels Inspect all aprons weekly & after each runoff event Replace displaced riprap within apron immediately

18 Figure 9.3 Riprap Apron Design, Minimum Tailwater Condition Not to be used for Box Culverts

19 Using Figures 9.3 and 9.4 For < full-pipe flow conditions, calculate anticipated velocity & adjust riprap size where necessary to comply with Table 6.6 Locate design discharge along bottom of Figure 9.3 or 9.4 Follow vertical line to point where it intersects first curve corresponding to diameter of discharge pipe From that point follow horizontal line to right to determine min R-size of riprap Do not extrapolate curve lines Where flows are below curve for specific pipe size, use min Rock Size & apron dimensions indicated at lower ends of curves for proposed pipe size Other guidance same as before

20 Flow Transition Mat May be used to prevent scour below pipe outfalls where anticipated flow depth of tailwater < 1/3 pipe diameter (D) Mats should be placed at pipe outlet, preferably in contact with pipe & centered laterally with pipe (see Figure 9.5) Surface on which mats are placed to be smooth & uniform If thick uniform sod not present, Turf Reinforcement Mat (TRM) or High Performance TRM (HPTRM) to be installed as underlayment for mats TRM (or HPTRM) should be capable of withstanding velocity > 5.5 fps in unvegetated condition

21 Flow Transition Mat Since Transition Mats do not dissipate energy, receiving channel should be capable of handling design discharge without accelerated erosion If this is not the case, additional energy dissipation to be provided Mats may also be used for other applications (e.g. streambank stabilization) if manufacturer s recommendations followed

22 Figure 9.5 Typical Transition Mat Installation NOTE: For permanent installations, replace sandbags with concrete or rock

23 Flow Transition Mat Design Flow Transition Mats to be installed on smooth, level (side to side) surface to avoid water concentration Where necessary, surface to be graded to remove any unevenness Mats not to be used where change in slope > 25% If thick sod not present, turf reinforcement mat (TRM) underlayment to be installed For slopes > 10H:1V, High Performance TRM (HPTRM) should be used TRMs should be capable of withstanding velocities > 5.5 fps

24 Flow Transition Mat Design Finish elevation of top of mats should be at or slightly below (3 max.) pipe outlet Width of mats should = downstream channel Where discharging directly into surface water, design should allow for as much expansion of flow width as possible to reduce velocities & promote infiltration Downstream slope should be as flat as possible to avoid increasing velocity Length of mat to be determined from Figure 9.6

25 Flow Transition Mat Design Double layer of mats (with the open area of the second layer offset from those of first layer) should be used where any of following conditions apply: Installation is on erodible soils Installation is located in Special Protection Watershed Discharge velocity > 7 fps Slope on which mat is placed > 10H:1V Anchor transition mats to achieve consistent contact with underlying surface & prevent seepage under mat Locate outlet & transition mat where adequate sunlight available to promote healthy vegetation Failure of transition mat has occurred when rill forms under mat Wherever that occurs, mat should be removed, rill graded, & higher form of protection provided

26 Figure 9.6 Minimum Coverage Length vs Exit Velocity for Flow Transition Mats

27 Stilling Basin (Plunge Pool) May be used at pipe outfalls where discharge at or near horizontal & sufficient room exists to construct basin between pipe & receiving watercourse Size & shape based upon anticipated scour hole below pipe outfall due to design discharge Experience has shown that size & amount of riprap required for stilling basin often < what would be required for riprap apron Should be designed & constructed according to details shown in SCD9-4 Geotextile may be substituted for filter stone underlayment Min vertical distance from bottom of pipe to max water surface elevation = 12

28 Standard Construction Detail # 9-4 Stilling Basin Riprap thickness to be 1.5 times max stone size Determine d50 Stone Size (d) for stilling basin from Figure 9.7 using design discharge & pipe diameter Guidance for calculating h and X unchanged

29 Figure 9.7 d50 Stone Size for Stilling Basins

30 Stilling Well May be used where little floating or rolling debris expected Tailwater increases efficiency, therefore well should be located in sump or depressed area Riprap protection should be provided for distance > 3 X well diameter downstream Should be constructed according to details shown in Figure 9.8

31 Figure 9.8 Stilling Well Height Guidance for determining well dimensions not changed

32 Energy Dissipaters Often used to reduce outlet velocity from pipe outfalls & box culverts where anticipated velocities >max permissible for other types of outlet protection Design procedures for 2 typical energy dissipaters provided in Appendix F Many other types of dissipaters may be approved if supporting calculations provided that show anticipated velocities have been reduced to acceptable levels & details showing all critical dimensions provided on plan drawings Wherever dissipaters are proposed, should be in place & functional prior to directing any proposed discharge to that point

33 Drop Structures Significant energy reduction can be accomplished by using drop structures within piped outfall system (see Figure 9.11) Resulting velocities at discharge point often within those allowable for typical apron protection Should be considered wherever anticipated velocities > 13.0 FPS May also be desirable for lower velocities to reduce size of rock in an apron or its overall dimensions To avoid potential problems with backup of water within manhole, depth of manhole should be > 2 times inflow pipe diameter Outlet pipe diameter should be larger than inflow unless hydraulic calculations show that pipe of equal diameter is sufficient to convey design discharge without backup

34 Figure 9.11 Typical Drop Structure

35 Earthen Level Spreaders LOCATION - Normally used where diversion ditches or dikes outlet onto areas of established vegetation (grass, typically not brush or forested). Not to be used below traps, basins, or stormwater pipes May be used for drainage areas < 1 acre where sediment-free stormwater runoff can be released in sheet flow down stabilized slope without causing erosion Where downstream slope is stabilized with grass, a min uniform cover of 90% required Wooded areas, with little or no grass cover, not considered stabilized areas for this purpose Should only be used where there will be no construction traffic over level spreader To avoid reconcentrating flow downstream of spreader, max distance from earthen level spreader to existing or constructed defined drainage course = 100 ft with 6% max slope & where very uniform & very stable site conditions exist Greater distances may be considered on case-by-case basis for very mild slopes & heavily vegetated areas but should not normally exceed 150 ft Earthen level spreaders should be constructed on soil, not on fill

36 Earthen Level Spreaders Max drainage area = 1 acre Max discharge = 1 cfs per ft of length based on peak rate of flow from a 10-yr frequency rainfall event Acceptable simplified method for determining minimum length (Lmin) Lmin = 5 ft/acre of drainage area

37 Earthen Level Spreaders Grade of the last 20 ft of diversion channel that feeds spreader should create smooth transition from channel grade to the spreader &, where possible, should be < 1% Construct earthen level spreaders to 0% Min width = 6 ft Transition section should be constructed between diversion channel & earthen spreader if widths different Protect lip with erosion-resistant material (e.g. reinforced erosion control blanket or TRM) Permanent installation - rigid lip of non-erodible material (e.g. pressure-treated timbers or concrete curbing) All unchanged

38 Earthen Level Spreaders Smooth transition to be provided between level spreader & native ground downslope Vegetated lip- erosion-control matting should be min 4, wide & extend 6 over lip Upstream edge to be buried at least 6 deep in vertical trench The downstream edge to be securely held in place with closely spaced, heavy-duty staples, at least 12 long Rigid level lip to be entrenched at least 2 below ground surface & securely anchored to prevent displacement Immediately after spreader constructed, entire area of spreader to be appropriately seeded & mulched Typical details of earthen level spreaders - SCD# 9-5

39 Standard Construction Detail # 9-5 Earthen Level Spreader

40 Structural Level Spreaders Usually individually designed to accommodate specific site conditions May be used below traps, basins, or stormwater pipes where no other means is available to discharge into a surface water Often desirable where basins discharge to wetlands, to encourage sheet flow rather than channel flow to wetlands Other applications include sites where groundwater recharge is objective Each site different - design criteria must be flexible; Plan preparer should use sound engineering judgment, & provide documentation for design criteria selected Should be constructed according to standards provided in Appendix G or approved alternative

41 Darl Rosenquest Sr. Civil Engineer DEP Waterways Engr & Wetlands California Mining Office 25 Technology Drive Coal Center, PA

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

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

More information

Outlet stabilization structure

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

More information

ENERGY DISSIPATION CHAPTER 7

ENERGY DISSIPATION CHAPTER 7 CHAPTER 7 ENERGY DISSIPATION 7.1 Overview... 7-1 7.2 Design Criteria... 7-1 7.2.1 General Criteria... 7-1 7.2.2 Erosion Hazards... 7-1 7.2.3 Recommended Dissipators... 7-1 7.3 Riprap Aprons... 7-2 7.3.1

More information

CITY UTILITIES DESIGN STANDARDS MANUAL

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.

More information

Suggested Stormwater Management Practices For Private Driveways and Roads

Suggested Stormwater Management Practices For Private Driveways and Roads Suggested Stormwater Management Practices For Private Driveways and Roads These practices are necessary to satisfy the water quantity and water quality criteria of the Rappahannock Stormwater Ordinance.

More information

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. 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

More information

Riprap-lined Swale (RS)

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

More information

City of Shelbyville Site Inspection Checklist

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

More information

Emergency Spillways (Sediment basins)

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]

More information

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 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

More information

STORM DRAINS CHAPTER 7

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

More information

City of Quinte West Storm Flow Management Section 7.0 Engineering Design Page 7-1 Standards January 2012

City of Quinte West Storm Flow Management Section 7.0 Engineering Design Page 7-1 Standards January 2012 Engineering Design Page 7-1 1.0 Storm Flow Management The objective of Storm Flow Management is to provide: The safe conveyance of stormwater to legal and adequate outlets Water quality control Flooding

More information

Chapter 11 Outfall Systems

Chapter 11 Outfall Systems Chapter 11 Outfall Systems This section presents the methods, criteria and details for analysis and design of outfall systems. Properly designed outfalls are critical to reducing the chance of adverse

More information

Table 4.9 Storm Drain Inlet Protetion Applicable for

Table 4.9 Storm Drain Inlet Protetion Applicable for BMP C220: Storm Drain Inlet Protection Purpose To prevent coarse sediment from entering drainage systems prior to permanent stabilization of the disturbed area. Conditions of Use Type of Inlet Protection

More information

CHAPTER 3 STORM DRAINAGE SYSTEMS

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

More information

DESIGN MANUAL CHAPTER 7: Energy Dissipation

DESIGN MANUAL CHAPTER 7: Energy Dissipation DESIGN MANUAL CHAPTER 7: Energy Dissipation 7.0 ENERGY DISSIPATION... 7-1 7.1 SYMBOLS AND DEFINITIONS... 7-1 7.2 DESIGN CRITERIA... 7-2 7.2.1 GENERAL CRITERIA... 7-2 7.2.2 EROSION HAZARDS... 7-2 7.2.3

More information

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 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

More information

City of Waupun. Public Works Department 201 E. Main St. Waupun, WI (920)

City of Waupun. Public Works Department 201 E. Main St. Waupun, WI (920) 1 STORM WATER MANAGEMENT PERMIT INFORMATION...2 2 SUBMITTAL CHECKLIST...3 3 PROJECT SUMMARY SHEET...4 4 PLAN SHEET CHECKLIST...6 5 GENERAL DESIGN REQUIREMENTS CHECKLIST...8 6 WET POND SUMMARY SHEET...11

More information

3.4 DRAINAGE PLAN. 3.4.1 Characteristics of Existing Drainages. 3.4.2 Master Drainage System. Section 3: Development Plan BUTTERFIELD SPECIFIC PLAN

3.4 DRAINAGE PLAN. 3.4.1 Characteristics of Existing Drainages. 3.4.2 Master Drainage System. Section 3: Development Plan BUTTERFIELD SPECIFIC PLAN 3.4 DRAINAGE PLAN This section describes the existing onsite drainage characteristics and improvements proposed within this Specific Plan. Following this description, drainage plan development standards

More information

Orifices may be constructed on a pipe, tee riser, baffle, or other structure intended for conveyance.

Orifices may be constructed on a pipe, tee riser, baffle, or other structure intended for conveyance. APPENDIX F CONTROL STRUCTURES FOR DETENTION SYSTEMS This appendix presents the methods and equations for the design of flow control structures. It includes illustrations and equations for the design of

More information

Preparing the Erosion and Sedimentation Control Plan

Preparing the Erosion and Sedimentation Control Plan 4 Preparing the Erosion and Sedimentation Control Plan Preparing the Erosion and Sedimentation Control Plan 4 Preparing the Erosion and Sedimentation Control Plan GENERAL CONSIDERATIONS Before preparing

More information

SECTION 08000 STORM DRAINAGE TABLE OF CONTENTS

SECTION 08000 STORM DRAINAGE TABLE OF CONTENTS 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

More information

Storm Drainage Systems 11.9-1

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

More information

SECTION 5 - STORM DRAINS

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

More information

APPENDIX G HYDRAULIC GRADE LINE

APPENDIX G HYDRAULIC GRADE LINE Storm Drainage 13-G-1 APPENDIX G HYDRAULIC GRADE LINE 1.0 Introduction The hydraulic grade line is used to aid the designer in determining the acceptability of a proposed or evaluation of an existing storm

More information

Chapter 3 CULVERTS. Description. Importance to Maintenance & Water Quality. Culvert Profile

Chapter 3 CULVERTS. Description. Importance to Maintenance & Water Quality. Culvert Profile Chapter 3 CULVERTS Description A culvert is a closed conduit used to convey water from one area to another, usually from one side of a road to the other side. Importance to Maintenance & Water Quality

More information

2016 NYS Standards and Specifications for Erosion and Sediment Control Finalized

2016 NYS Standards and Specifications for Erosion and Sediment Control Finalized August, 2016 2016 NYS Standards and Specifications for Erosion and Sediment Control Finalized DEC has finalized updates to the New York State Standards and Specifications for Erosion and Sediment Control

More information

Stormwater/Wetland Pond Construction Inspection Checklist

Stormwater/Wetland Pond Construction Inspection Checklist : Construction Inspection ChecklistsTools Stormwater/Wetland Pond Construction Inspection Checklist Project: Location: Site Status: Date: Time: Inspector: SATISFACTORY/ UNSATISFACTORY COMMENTS Pre-Construction/Materials

More information

1. brief narrative. 3. maintenance plan. 6. site development plan

1. brief narrative. 3. maintenance plan. 6. site development plan 7 7 Attached is a sample erosion and sedimentation control plan based on one This sample plan was developed in detail for instructive purposes. The should select the most practical and effective practices

More information

CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL SECTION 1100 ADDITIONAL HYDRAULIC STRUCTURES

CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL SECTION 1100 ADDITIONAL HYDRAULIC STRUCTURES CLARK COUNTY REGIONAL FLOOD CONTROL DISTRICT HYDROLOGIC CRITERIA AND DRAINAGE DESIGN MANUAL SECTION 1100 ADDITIONAL HYDRAULIC STRUCTURES TABLE OF CONTENTS Page 1101 INTRODUCTION 1102 1102 CHANNEL DROPS

More information

Topic 8: Open Channel Flow

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,

More information

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

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

More information

CHAPTER IX HYDRAULICS AND DRAINAGE

CHAPTER IX HYDRAULICS AND DRAINAGE CHAPTER IX HYDRAULICS AND DRAINAGE 9-04.1 GENERAL. Providing for the control of erosion is a necessary part of the complete design of any highway construction project. These provisions must include measures

More information

Storm Drain Inlet Protection - IP

Storm Drain Inlet Protection - IP Storm Drain Inlet Protection - IP DEFINITION A temporary protective device formed around a storm drain drop inlet to trap sediment. PURPOSE To prevent sediment from entering storm drainage systems, prior

More information

9.4 EXTENDED DETENTION BASINS

9.4 EXTENDED DETENTION BASINS 9.4 EXTENDED DETENTION BASINS An extended detention basin is a stormwater management facility that temporarily stores and attenuates stormwater runoff. In addition, extended detention basins provide pollutant

More information

FIRST RESPONSE: STORM DAMAGE MITIGATION OF A BMP FAILURE

FIRST RESPONSE: STORM DAMAGE MITIGATION OF A BMP FAILURE FIRST RESPONSE: STORM DAMAGE MITIGATION OF A BMP FAILURE Author: Audrey G. Beaulac, P.E., CPSWQ Company: (Hoyle, Tanner), Manchester, New Hampshire INTRODUCTION In early July 2013, 2 inches of rain fell

More information

EROSION & SEDIMENT CONTROL (E&S) PLAN For projects disturbing less than one (1) acre

EROSION & SEDIMENT CONTROL (E&S) PLAN For projects disturbing less than one (1) acre Revised September 2014 EROSION & SEDIMENT CONTROL (E&S) PLAN For projects disturbing less than one (1) acre According to state regulations, any earth disturbance activity totaling 5,000 square feet or

More information

STANDARD AND SPECIFICATIONS FOR STORM DRAIN INLET PROTECTION

STANDARD AND SPECIFICATIONS FOR STORM DRAIN INLET PROTECTION STANDARD AND SPECIFICATIONS FOR STORM DRAIN INLET PROTECTION Design Criteria Drainage Area The drainage area for storm drain inlets shall not exceed one acre. The crest elevations of these practices shall

More information

SECTION EROSION AND SEDIMENTATION CONTROL

SECTION EROSION AND SEDIMENTATION CONTROL SECTION 31 25 00 EROSION AND SEDIMENTATION CONTROL PART 1 GENERAL 1.01 SECTION INCLUDES A. This WORK shall consist of temporary measures needed to control erosion and water pollution. These temporary measures

More information

Engineering Specifications February, 2004 Schedule H to Bylaw 7452, Subdivision Bylaw Page 18

Engineering Specifications February, 2004 Schedule H to Bylaw 7452, Subdivision Bylaw Page 18 Schedule H to Bylaw 7452, Subdivision Bylaw Page 18 3.4 Sanitary Sewers 3.4.1 Materials 3.4.1.1 The class and type of pipe and fittings, together with required class of bedding and trench widths, shall

More information

CHAPTER 5. Storm Sewer and Open Channels

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

More information

Town of Elkton & Cecil Soil Conservation District Checklist for Joint Agency Review Stormwater Management / Erosion and Sediment Control

Town of Elkton & Cecil Soil Conservation District Checklist for Joint Agency Review Stormwater Management / Erosion and Sediment Control Town of Elkton & Cecil Soil Conservation District Checklist for Joint Agency Review Stormwater Management / Erosion and Sediment Control Project Name: Tax Map Parcel: Acreage: Plat: ADC Map & Grid Engineering

More information

1. Carry water under the canal 2. Carry water over the canal 3. Carry water into the canal

1. Carry water under the canal 2. Carry water over the canal 3. Carry water into the canal Lecture 21 Culvert Design & Analysis Much of the following is based on the USBR publication: Design of Small Canal Structures (1978) I. Cross-Drainage Structures Cross-drainage is required when a canal

More information

SECTION 108 - INLETS 108.1 INLET LOCATIONS

SECTION 108 - INLETS 108.1 INLET LOCATIONS Greene County Design Standards -Adopted April 5, 1999 SECTION 108 - INLETS SECTION 108 - INLETS 108.1 INLET LOCATIONS 108.2 INLET INTERCEPTION CAPACITIES 108.2.1 Clogging Factors 108.3 INTERCEPTION AND

More information

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 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

More information

DESCRIPTION OF STORMWATER STRUCTURAL CONTROLS IN MS4 PERMITS

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

More information

Temporary Erosion-Control Measures

Temporary Erosion-Control Measures A Guide to Temporary Erosion-Control Measures for Contractors, Designers and Inspectors June 2001 North Dakota Department of Health Division of Water Quality A Guide to Temporary Erosion-Control Measures

More information

Minimizes sediment and debris from entering storm drains that lead to waterways and watercourses.

Minimizes sediment and debris from entering storm drains that lead to waterways and watercourses. 4.5-p DRAIN INLET PROTECTION Alternative Names: DI protection, Drop Inlet Protection DESCRIPTION Storm drain inlet (DI) protection slows and ponds stormwater, and filters sediment and debris before it

More information

Basic Hydrology. Time of Concentration Methodology

Basic Hydrology. Time of Concentration Methodology Basic Hydrology Time of Concentration Methodology By: Paul Schiariti, P.E., CPESC Mercer County Soil Conservation District What is the Time of Concentration? The time it takes for runoff to travel from

More information

SE-10 STORM DRAIN INLET PROTECTION. Objectives

SE-10 STORM DRAIN INLET PROTECTION. Objectives STORM DRAIN INLET PROTECTION SE-10 Objectives Erosion Control - EC Sediment Control - SE Tracking Control - TC Wind Erosion Control - WE Non-Storm Water Management - NS Waste and Materials Management -

More information

Lecture 24 Flumes & Channel Transitions. I. General Characteristics of Flumes. Flumes are often used:

Lecture 24 Flumes & Channel Transitions. I. General Characteristics of Flumes. Flumes are often used: Lecture 24 Flumes & Channel Transitions I. General Characteristics of Flumes Flumes are often used: 1. Along contours of steep slopes where minimal excavation is desired 2. On flat terrain where it is

More information

Lecture 22 Example Culvert Design Much of the following is based on the USBR technical publication Design of Small Canal Structures (1978)

Lecture 22 Example Culvert Design Much of the following is based on the USBR technical publication Design of Small Canal Structures (1978) Lecture 22 Example Culvert Design Much of the following is based on the USBR technical publication Design of Small Canal Structures (1978) I. An Example Culvert Design Design a concrete culvert using the

More information

BMP-7. A sediment filter or an excavated impounding area around a storm drain drop inlet or curb inlet.

BMP-7. A sediment filter or an excavated impounding area around a storm drain drop inlet or curb inlet. BMP-7 BMP: STORM DRAIN INLET PROTECTION Definition A sediment filter or an excavated impounding area around a storm drain drop inlet or curb inlet. To prevent sediment from entering storm drainage systems

More information

Storm Drain Inlet Protection

Storm Drain Inlet Protection 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 Control Legend: Primary Objective

More information

Guidelines for the Construction of Low Flow Bypass Devices

Guidelines for the Construction of Low Flow Bypass Devices TECHNICAL FACT SHEETS IN THIS SERIES Sheet 3a On-Stream Dams Sheet 3b Off-Stream Diversions Sheet 3c Off-Stream Diversion with a 50:50 Flow Split Small Weir to Divert Low Flows caption to go here Guidelines

More information

CHAPTER 5. Storm Sewer

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

More information

CHAPTER 2 HYDRAULICS OF SEWERS

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

More information

TRAPEZOIDAL FLUME. User s Manual. Trapezodidal Flume User s Manual

TRAPEZOIDAL FLUME. User s Manual. Trapezodidal Flume User s Manual TRAPEZOIDAL FLUME User s Manual i Trapezodidal Flume User s Manual TABLE OF CONTENTS Introduction to the Trapezoidal Flume... 1 Development... 1 Function... 1 Design... 2 Standards... 3 Accuracy... 3

More information

DIVISION V SECTION 5100 EROSION AND SEDIMENT CONTROL

DIVISION V SECTION 5100 EROSION AND SEDIMENT CONTROL DIVISION V SECTION 5100 EROSION AND SEDIMENT CONTROL (September 15, 2010) APWA 5100 September 2010 DIVISION V DESIGN CRITERIA 5100 EROSION AND SEDIMENT CONTROL APPROVED AND ADOPTED THIS 15 DAY OF SEPTEMBER

More information

APPENDIX B DESIGN GUIDELINES FOR APPROVED TREATMENT METHODS

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

More information

CHAPTER 5 OPEN CHANNEL HYDROLOGY

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

More information

Block and Gravel Inlet Protection (BIP)

Block and Gravel Inlet Protection (BIP) Block and Gravel Inlet Protection (BIP) Practice Description Block and gravel inlet protection is a sediment control barrier formed around a storm drain inlet by the use of standard concrete block and

More information

Storm Drain Inlet Protection

Storm Drain Inlet Protection 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 Category

More information

SUSTAINABLE URBAN DRAINAGE SYSTEMS

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

More information

SECTION 5: SANITARY SEWER SYSTEM DESIGN

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

More information

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

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

More information

CHAPTER 4 STORM DRAINAGE SYSTEMS

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

More information

CHAPTER 5 STORMWATER DRAINAGE SYSTEM DESIGN. Table of Contents SECTION 5.1 STORMWATER DRAINAGE DESIGN OVERVIEW

CHAPTER 5 STORMWATER DRAINAGE SYSTEM DESIGN. Table of Contents SECTION 5.1 STORMWATER DRAINAGE DESIGN OVERVIEW 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

More information

SEDIMENT/STORMWATER MANAGEMENT BASIN CONSTRUCTION CHECKLIST

SEDIMENT/STORMWATER MANAGEMENT BASIN CONSTRUCTION CHECKLIST SEDIMENT/STORMWATER MANAGEMENT BASIN CONSTRUCTION CHECKLIST For permanent structures per Delaware SCS Pond Code 378 and Delaware Sediment and Stormwater Regulations KEY PROJECT INFORMATION Item meets standard

More information

Enhanced Swales STORMWATER MANAGEMENT SUITABILITY

Enhanced Swales STORMWATER MANAGEMENT SUITABILITY 3.0 General Application Structural Stormwater Control Description: Vegetated open channels that are explicitly designed and constructed to capture and treat stormwater runoff within dry or wet cells formed

More information

SECTION 7- STORM SEWER

SECTION 7- STORM SEWER SECTION 7- STORM SEWER 7.1. STORM SEWERS.... 7-1 7.2. SUMP DRAINS... 7-3 7.3. CATCH BASINS... 7-3 7.4. MANHOLES... 7-4 7.5. STORM SEWER CALCULATIONS... 7-4 7.6. CULVERTS AND BRIDGES... 7-5 7.7. OPEN CHANNELS...

More information

STORMWATER MANAGEMENT CHECKLIST

STORMWATER MANAGEMENT CHECKLIST STORMWATER MANAGEMENT CHECKLIST *This checklist must be completed and part of the Land Disturbing Permit submittal for review if the acreage disturbed is one (1) acre or more: I. SUPPORTING DATA Narrative

More information

SECTION 6A STORM DRAIN DESIGN Mar. 2002 S E C T I O N 6A STORM DRAIN - DESIGN

SECTION 6A STORM DRAIN DESIGN Mar. 2002 S E C T I O N 6A STORM DRAIN - DESIGN S E C T I O N 6A STORM DRAIN - DESIGN 6A.l Scope 6A.2 Storm Water Quantity 6A.3 Storm Drain Hydraulics 6A.4 Depths 6A.5 Locations 6A.6 Curved Storm Drains 6A.7 Manholes 6A.8 Catch basins 6A.9 Storm Drain

More information

SECTION 5. Sediment Control Measures

SECTION 5. Sediment Control Measures SECTION 5 Sediment Control Measures 60. STORM DRAIN INLET PROTECTION When Runoff from earth change activities will discharge to a catch basin or storm drain inlet. A newly constructed catch basin or storm

More information

City of Doral 8300 NW 53 rd St. Doral, FL (305)

City of Doral 8300 NW 53 rd St. Doral, FL (305) City of Doral 8300 NW 53 rd St. Doral, FL 33166 (305) 593-6725 National Pollution Discharge Elimination System (NPDES) Construction Site Erosion and Sedimentation Control Introduction: The City of Doral

More information

Section 3. HYDRAULIC DESIGN A. Weirs and Orifices

Section 3. HYDRAULIC DESIGN A. Weirs and Orifices Section 3. HYDRAULIC DESIGN A. Weirs and Orifices NOTE: Some of the graphs contained in this section are copied from the Los Angeles Hydraulics Manual and we wish to give them credit for their efforts.

More information

The Low Risk Site Handbook. for Erosion Prevention and Sediment Control

The Low Risk Site Handbook. for Erosion Prevention and Sediment Control The Low Risk Site Handbook for Erosion Prevention and Sediment Control August 2006 The Low Risk Site Handbook for Erosion Prevention and Sediment Control Any construction activity that disturbs 1 or more

More information

Time of Concentration

Time of Concentration Design Manual Chapter 2 - Stormwater 2B - Urban Hydrology and Runoff 2B-3 Time of Concentration A. Introduction Time of concentration (T c ) is the time required for runoff to travel from the hydraulically

More information

Single Family Residential Erosion and Sediment Control Standards

Single Family Residential Erosion and Sediment Control Standards July 2011 Planning and Development Services Single Family Residential Erosion and Sediment Control Standards This booklet contains standard plans and procedures appropriate for typical residential building

More information

CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN TEMPLATE

CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN TEMPLATE CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN TEMPLATE The following template may be used as a general guide for development of a Stormwater Pollution Prevention Plan (SWPPP) for construction activities.

More information

NOTE: A HARDCOPY OF THE DRAINAGE REPORT AND CONSTRUCTION DRAWINGS MUST BE SUBMITTED TO PUBLIC WORKS FOR REVIEW.

NOTE: A HARDCOPY OF THE DRAINAGE REPORT AND CONSTRUCTION DRAWINGS MUST BE SUBMITTED TO PUBLIC WORKS FOR REVIEW. Weld County Public Works Change of Zone Drainage Report Outline The following checklist is to be utilized as guidance, and may not be all inclusive. Other concerns not included in this checklist may arise

More information

STORM DRAIN DESIGN STANDARDS SECTION 4

STORM DRAIN DESIGN STANDARDS SECTION 4 STORM DRAIN DESIGN STANDARDS SECTION 4 4.100 GENERAL All drainage facilities shall be designed in accordance with accepted engineering principles, and shall conform to these Design Standards. 4.200 SUBMITTAL

More information

CHAPTER 9 STORM DRAINAGE

CHAPTER 9 STORM DRAINAGE CHAPTER 9 STORM DRAINAGE Section Page 9.01 General...1 9.02 Design Standards...1 9.03 Construction Stormwater Pollution Prevention...2 9.04 Department of Ecology Stormwater Permits...4 9.05 Maintenance

More information

Using Site Design Techniques to Meet Development Standards for Stormwater Quality

Using Site Design Techniques to Meet Development Standards for Stormwater Quality Using Site Design Techniques to Meet Development Standards for Stormwater Quality A Companion Document to Start at the Source May 2003 Bay Area Stormwater Management Agencies Association Bay Area Stormwater

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

Instructions for the Installation of Driveway Entrances

Instructions for the Installation of Driveway Entrances Instructions for the Installation of Driveway Entrances 1 Step 1 - Permits Complete the Work Within Highway Right-of-Way Permit. A representative from the Department of Transportation and Infrastructure

More information

SAMPLE COPY. Stormwater Pollution Prevention Plan. A site map must be developed and must contain, at a minimum, the following information:

SAMPLE COPY. Stormwater Pollution Prevention Plan. A site map must be developed and must contain, at a minimum, the following information: Stormwater Pollution Prevention Plan "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure

More information

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

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

More information

DEPARTMENT OF DEVELOPMENT SERVICES Development Services Center 215 W. Hickory Street Denton, Texas voice: (940)

DEPARTMENT OF DEVELOPMENT SERVICES Development Services Center 215 W. Hickory Street Denton, Texas voice: (940) Property Information: Project Name: Parcel(s) Tax ID# (Required): Project Address (Location): Total Acres: Previous Project Number (If Applicable): Existing Zoning: # of Existing Lots: # of Existing Units:

More information

SECTION 300 STORM SEWER AND SUMP PUMP DRAIN SYSTEMS

SECTION 300 STORM SEWER AND SUMP PUMP DRAIN SYSTEMS SECTION 300 STORM SEWER AND SUMP PUMP DRAIN SYSTEMS Section Title Page 301 General................................... 18 302 Materials.................................. 18 303 Design Requirements........................

More information

DRAINAGE MANUAL CHAPTER VII STORM DRAINAGE SYSTEMS

DRAINAGE MANUAL CHAPTER VII STORM DRAINAGE SYSTEMS TDOT DESIGN DIVISION DRAINAGE MANUAL CHAPTER VII STORM DRAINAGE SYSTEMS August 1, 2012 CHAPTER 7 STORM DRAINAGE SYSTEMS SECTION 7.01 INTRODUCTION 7.01 INTRODUCTION...7-1 SECTION 7.02 DOCUMENTATION PROCEDURES

More information

Sediment Control and Pollution Prevention Presentation 3 of 3

Sediment Control and Pollution Prevention Presentation 3 of 3 Sediment Control and Pollution Prevention Presentation 3 of 3 This presentation was produced by the JOHNSON COUNTY STORMWATER MANAGEMENT PROGRAM 1800 W. 56 Highway Olathe, KS 66061 Sediment Controls Device

More information

Guo, James C.Y. (2004). Design of Urban Channel Drop Structure, J. of Flood Hazards News, December,

Guo, James C.Y. (2004). Design of Urban Channel Drop Structure, J. of Flood Hazards News, December, Guo, James C.. (004). esign of Urban Channel rop Structure, J. of Flood azards News, ecember, Guo, James C.., (009) Grade Control for Urban Channel esign, submitted to Elsevier Science, J. of ydro-environmental

More information

Infiltration Sump System

Infiltration Sump System Stormwater Management Goals Achieved Acceptable Sizing Methodologies Pollution Reduction.... NA Flow Control. PRES Destination PRES This facility is classified as an Underground Injection Control structure

More information

SC-07 STORM DRAIN INLET PROTECTION

SC-07 STORM DRAIN INLET PROTECTION Greenville County Technical Specification for: SC-07 STORM DRAIN INLET PROTECTION 1.0 Storm Drain Inlet Protection 1.1 Description Provide Storm Drain Inlet Protection at all existing and newly installed

More information

City of Bozeman. Construction Site Management Program

City of Bozeman. Construction Site Management Program City of Bozeman Construction Site Management Program Best Management Practice (BMP) Manual for Construction Sites Version 3 September 1, 2016 Section 1 Overview Table of Contents Manual Introduction 3

More information

CW EXCAVATION BEDDING AND BACKFILL TABLE OF CONTENTS

CW EXCAVATION BEDDING AND BACKFILL TABLE OF CONTENTS February 2005 DIVISION 3 - CW 2030 R7 CW 2030 - EXCAVATION BEDDING AND BACKFILL TABLE OF CONTENTS 1. DESCRIPTION...1 1.1 General...1 1.2 Definitions...1 1.3 Referenced Standard Construction Specifications...1

More information

Drainage System Maintenance

Drainage System Maintenance Drainage System Drainage Goals Keep channels and basins clear of debris Maintain flood carrying and storage capacity Protect water quality Introduction and Purpose Scope Pequannock s storm water collection

More information

SITE-SPECIFIC BEST MANAGEMENT PRACTICES (SSBMP) PLAN/STORM WATER POLLUTION PREVENTION PLAN (SWPPP) REVIEW CHECKLIST

SITE-SPECIFIC BEST MANAGEMENT PRACTICES (SSBMP) PLAN/STORM WATER POLLUTION PREVENTION PLAN (SWPPP) REVIEW CHECKLIST This checklist may be used by applicants for encroachment permits, and contractors in development of Site Specific Best Management Practice (SSBMP) Plans or Storm Water Pollution Prevention Plans (SWPPP)

More information

Road Drainage Alternatives

Road Drainage Alternatives Road Drainage Alternatives By Don Lindsay, CEG, PE Engineering Geologist/Civil Engineer California Geological Survey don.lindsay@conservation.ca.gov Three of the most important aspects of road design drainage,

More information