Sewer Line Requests

City of Las Vegas

Clark County Water Reclamation District (CCWRD)

Sewer Capacity Study

  • For modeling purposes, all flow is assumed to enter the sewer system at the most upstream manhole in each tributary basin area. This provides a conservative design throughout the system.
  • a Manning's “n” of 0.013 shall be used for hydraulic design. Sewers less than 12“ diameter shall be design to flow half full at peak flow rate. Sewers 12” or larger shall be designed to flow two-thirds at peak flow rate.

Average Flow Rate

  • Need
    • Number of homes/apartments - example 365 units
    • Number of people per home or apartment - example 2.15 persons
    • Person uses 100 gpd (gallons water per day) per person
  • Calculation of Average Day Flow
    • Average Day Flow = 365 units * 2.15 persons/units * 100 gpd/person = 82,775 gpd (0.13 cfs)

Peak Day Flow

  • Peak Day Flow = 2 * Average Day Flow = 2 * 82,775 gpd (0.13 cfs) = 165,550 gpd (0.26 cfs)

Sewer Main Size

Modeling Software

Hydraflow Express

Civil 3D Pipe Network Export to Agencies

Civil 3D Pipes Network

  1. Pipe Network - not alignment, select all existing
  2. How do you change pipe direction
  • Create Pipe Network from Object

Civil 3D Create Sewer Laterals

Step 1 - Open Pipe Network Source Drawing

  • T:\CAD\Job#\Drawings\External References\Source Drawings\Pipe Networks\C-Job#-PIPE-SS.dwg
    • Note - cannot edit Pipe Networks in Data Shortcut (DREF) or XREF drawings, must edit the source
  • XREF in X-Job#-UT.dwg (should have 2D layout of sewer main and laterals)

Step 2 - Select Pipe Catalog

View Pipe Network Part Catalog

    • Tools → Internet Options → Security tab
    • Security Settings
  • Step B - Windows Explorer and Internet Explorer
    • use Windows Explorer to navigate to parts catalog
    • right click on US Imperial Structures.htm and select Open With - Internet Explorer
    • Open with IE
  • Step C - IE Developer Mode
    • Press F12 to open DOM Explorer at the bottom of IE window
    • Document Mode = 5
    • View Pipe Network Part Catalog


Step 3 - Select Main Pipe Network

  • Select Pipe Network
  • Edit Pipe Network button to open Network Layout Tools dialog box
  • Change default pipe style from “Inside pipe wall” to “LCU-SD-EX” for storm drains
    • Storm Drain Style
  • Draw Lateral from uphill (stub) to downhill (main)
    • Slope 2% (uphill) or -2% (downhill)
    • Upslope and Downslope
    • invert elevation at main, increase 3“ (0.083') above main invert. Brian at Lochsa likes to model based on pipe centerline instead of inverts.
    • Sewer Connect Lateral at Inverts

Step 4 - Add Drop Inlets

  • Select Lateral
  • Edit Pipe Network
  • Network Layout Tools Dialog Box - Select Drop Inlet
    • Storm Drain Drop Inlet

Step 5 - Edit Invert Elevations

  • Pipe Network Vistas
  • Pipes tab
    • Start Invert
    • End Invert

Step 6 - Add to Profile

  • Select Pipe in Plan View
  • Pipe Networks context ribbon
    • Network Tools → Draw Parts in Profile
    • Click Profile View Grid

Civil 3D Sewer Layers

  • C3D Sewer Layers

Civil 3D Manhole Structures

  • Structure Properties - Drop Value
  • How to add RIM elevation to a pipe Structure
    • Automatic Surface Adjustment: False (default is true - which means rim elevation cannot be changed)
    • Rim elevation of pipe structure
  • Errors

Sewer Manholes

  • “The drop across the cast-in-place or pre-cast manhole invert shall be 0.2 ft minimum” (DCSWCS 2.3.19 Manholes and Manhole Appurtenances)
  • CCWRD Manhole Inverts
  • Install a manhole on existing sewer main. The incoming new sewer main must have invert elevation (2450.30') must 0.2' higher than existing inverts (2450.10')
    • Sewer Manhole Inverts

Sewer Manhole Max Distance Between

Sewer Manhole Collar

Sewer Mains

Sewer Profiles

  • [Q] How do you add sewer main to the profile?
    • Profile View Properties → Pipe Networks → check Yes on structure
    • Add Sewer To Profile

Connect New Main to Existing Manhole

    • 2.3.8.D. New sewers to existing manholes:
      • The base of the manhole shall be core-drilled in accordance with Section 3.16.4 and an appropriate seal boot, per Agency’s approved materials list, shall be used to positively seal against infiltration and exfiltration. Break-in connections shall not be permitted. The flow channels in the bases of existing manholes to which new sewers are connected shall be modified in accordance with Section 2.3.19.b to provide for efficient passage of wastewater flows. Manhole flow channel modifications shall generally conform to Standard Drawing SD-9. Where the new sewers are larger than 15-inches in diameter, the connection requirements to existing manholes will be determined on a case-by-case basis. The Engineer shall contact the Agency as soon as possible in the Project design process to determine sewer connection requirements.
  • Evansville Water and Sewer Utility - New Pipe Connection to Existing Manhole
    • Evansville - New Pipe Connection to Existing Manhole

Sewer Laterals and Manholes

Parallel Separations Water and Sewer Mains

  • UDACS 2.22 Water and Sewer/Storm Main Crossings and Clearances
    • 2.22.01 Parallel Separations (Mains)
      • A.1. Water mains and sewer lines shall be installed in separate trenches with at least ten (10) feet of separation measured horizontally from exterior pipe walls.
      • UDACS water and sewer separation
    • Water mains and sewer lines shall be installed in separate trenches with at least ten (10) feet of separation measured horizontally from exterior pipe walls. (UDACS 2nd, 2.19.01 p. 2-25)

Min Depth of Cover

  • DCSWCS 2019 - 2.3.6 Sewer Line Depths and Alignments
    • Design Standards

Min and Max Pipe Slopes

  • Mannings Equation
  • Table D - Pipe Slopes
  • Uniform Plumbing Code - Grade of Horizontal Drainage Piping

Wastewater Treatment

  • Primary Treatment Standards
    • influent treatment - screen to remove rags, bottles, etc.
  • Secondary Treatment Standards resulting effluent discharged to a stream/lake surface water
    • 5-day biochemical oxygen demand (BOD5)
    • Total Suspended Solids (TSS) removal
    • pH
    • Nutrients
      • phosporas
      • nitrogen
  • Tertiary Treatment
  • Clean Water Act requires National Pollutant (NPDES permit)

Sewer Drawing Guidelines

A. Title Block

  1. Project Name
  2. Developer's Name, Business Address, Business Phone Number, 24/7 Emergency Contact Phone Number and Name
  3. Engineer's Company Name, Business Address, Business Phone Number, 24/7 Emergency Contact Phone Number and Name
  4. Engineer's Stamp
  5. Drawing Scale (Vertical & Horizontal), both numerical and bar graph form
  6. Revision Block
  7. Provide Vicinity Map (this should go on the Cover Sheet)

B. Cover Sheet

  1. Agency Signature Block
  2. Vicinity Map (Major Cross Streets)
  3. APN Number
  4. Benchmarks & basis of bearing

C. Notes Sheet

  1. General Notes per Approving Agency
  2. Agency Signature Block
  3. Deviation from Design Standards Signature Block
  4. Sewer Quantity List

Sewer General Notes

D. Master Utility Sheet

  • Master Utility Plan Sheets shall be provided for all projects having two or more utility sheets and for all subdivisions, unless otherwise required by Agency.
  1. Agency Signature Block
  2. Include 'North' arrow
  3. Plan View
    • Manhole Numbers
  4. Public Manhole Table (include)
    • Manhole Numbers
    • Northing and Easting
    • Station/Offset (centerline of street/easement unless otherwise noted by approving agency)
    • RIM Elevations
    • Invert In - all invert in directions
    • Invert Out
    • Depth
    • Diameter
    • Indicated if Corrosion Protected or Not

Sewer Main Pipe Table

    • Civil 3D Table Style Sewer Main
    • Civil 3D Table Style Sewer Manhole

E. Utility Plan Sheet

  1. Include North arrow
  2. Street Names (if 'private' label as such)
  3. Show sewer mains (label as 'private' or 'public')
  4. Lot numbers and block number
  5. Indicated the number of lots to be served by the Project and if the Project is a phase of a larger development indicate the total number of lots for full build-out (if known)
  6. Finish floor elevations
  7. Station/Offset (centerline of street)
  8. Lateral locations
  9. Typical lateral layout details
  10. agency signature block
  11. manhole number
  12. manhole rim elevation
  13. show all utilities, include size and type
  14. All horizontal dimensions including clearances with other utilities
  15. Construction notes are to include lateral and backwater valve (BWV) information per Southern Nevada Building Official's Amendments and Current UPC

F. Plan & Profile Sheets

  1. Include North arrow
  2. Plan View
    • provide azimuths or bearing angles (upstream to downstream) for new sanitary sewers
    • street names
    • show flow arrows on all sewer lines
    • show all right of way widths for all utilities
    • street stationing/offset (centerline of street)
    • show all sewer and patent easement boundaries
    • show all utilities, include type and size, vertical and horizontal location
    • show distance between horizontal utilities, dimension from outside to outside of pipe
    • Label Point Of Connection as “POC”
    • show all Sewer mains (label 'Private' or 'Public')
    • Show launching/receiving shafts (where required) for pipe jacking
    • show all laterals, existing and new
    • Show the 'drivable access' in accordance with Section 2.3.20 provided for facility maintenance. Provide a structural roadway section of materials and design for the 'drivable access'.
    • Identify upstream and downstream termini
  3. Profile view
    • indicate manhole numbers
    • indicate manhole stations
    • indicate manhole offset
    • indicate manhole size, type and depth
    • indicate manhole northing and easting
    • indicate manhole rim elevation
    • indicate manhole invert in - all invert in directions
    • indicate manhole invert out
    • indicate street stationing
    • indicated pipe length (manhole to manhole)
    • indicate pipe diameter
    • indicate pipe slope
    • indicate pipe material
    • show grade elevations
    • show all utility crossings (dimension from outside to outside), include any specifics required if clearances do not meet minimum requirements
  4. Construction Notes - include all items necessary to construct sewer shown on sheet. Keep notes consistent from sheet to sheet. Call out appropriate DCSWCS Standard Drawings for all sewer appurtenances.

Sewer Demand

Sewer Line Rules

Grease Interceptor

  • Grease Interceptor

Wastewater Treatment

Wetland Construction

Idaho Department of Environmental Quality

Removal of Phosphate


Seepage Bed - Parking Onsite Retention

  • Figure 1-0 Carl's Jr - Jerome ID Seepage Bed

Abandon Septic Tank - New Sewer Connection


  1. Building Permit Number (PAC# for Clark County)
  2. CCWRD Plan Review (no review or inspection fees)
    1. submit Data Sheet
    2. only 1 copy of plan
    3. calculations must be on both plan and data sheet
    4. Data sheet needs both Engineer's email and Client's email address
  3. Mylar signatures
  4. Mylar approval
    1. no signature required by SNHD
  5. Sewer Connection Application (Clark County Water Reclamation ? Customer Service ? Sewer Connection ? Download application)
    1. Rate Resolution (fee chart)
    2. fee \$1600 conversion from septic to public sewer

- fee \$2195 new construction

  1. Offsite Building Permit
    1. Posting Bonds (702-455-1087)
    2. Bond
    3. Off-site improvement agreement(OSIA)
    4. Legal description
    5. Personal check for county fees
    6. Articles of Organization of Secretary of State Proof of Signatory
    7. Certificate of Liability Proof of Insurance (\$1,000,000)
  2. hire Class A General Contractor
  3. fill in septic tank with soil
    1. take pictures and submit to SNHD


Sewer Standards

California - Camarillo

California - Sacramento Area Sewer District


Civil Engineering Engineering - Computer Engineering - Electrical Mechanical Engineering

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