How To Inventory A Sewer Line

Transcription

1 Municipal DataWorks INVENTORY MANUAL for Municipal Sewers Networks September 2008 Ontario Good Roads Association 1

2 INTRODUCTION This manual provides a uniform method of inventorying the physical and service characteristics of all sewer assets included in the MDW master file as follows: Figure 1 There are some attributes that have been included in the Municipal DataWorks master file that are specific to certain municipalities. These attributes do not have a definition, OGRA will continue to work and provide these definitions. MUNICIPAL SEWER NETWORK APPRAISAL INSTRUCTIONS All components of a sewer network under a municipality's jurisdiction should be inventoried in accordance with the instructions contained in this manual. Asset types such as manholes, catchbasins and pump stations may have a record created for each individual asset or for a count of assets of the same type. Sanitary and storm sewer line asset types, shall have one appraisal sheet completed for each individual section and type of sewer. Do not combine sewer lines with different usage on the same appraisal sheet. There is no limit in Municipal DataWorks as to how long a sewer section may be. Consideration should be given to adding sections to the inventory when pipe material type changes, when pipe diameter changes, when pipe alignment changes and when structural condition changes for a significant length of pipe. In developing the section length consideration should be given as to how the system will be managed for capital planning and asset valuation purposes. Sewer sections typically are established for centerline of manhole to centerline of manhole or from centerline of manhole to end of pipe at an outfall (storm sewers). To avoid creating a number of short sections more than one intermediate manhole can be included in the section length providing that pipe material and pipe diameter remain the same over the entire section. 2

3 PART I IDENTIFICATION SECTION This section of the inventory page identifies the Asset Type, Asset ID, Asset Name, Asset Status, Asset Material, GIS ID # and jurisdictional status of a sewer section within the municipality. Asset Type, Asset ID, Asset Name and Asset Status are required fields as denoted by the asterisk (*). Part 1 is applicable to all asset types shown in Figure 1. Asset Type On the add asset pick list, select the asset type. Asset ID Options for Asset ID number are a numeric number, an alpha number or a combination alpha/numeric number and a number that includes a decimal. Municipalities are free to choose a numbering system that makes sense for your municipality. Thought should be given to how the numbering system is established as there may be a future requirement to add new sewer sections into the system that may need to fit into the number system. A municipality may choose to use the road section asset ID as a prefix for the sewer section. For example, 10101_STM could identify the storm sewer, 10101_SAN could be used to identify the sanitary sewer. This numbering system works if all sewer sections in the entire network have the same start and end coordinates as does the road section. Otherwise a unique numbering system should be established, SAN100, STM100. Asset Name This item can accommodate up to 64 characters. It may include some, all or any of the following data: asset ID number, local road name, lot & concession. Asset Status Active assigned to an asset, when the inventory information for that asset is to be used in capital investment planning, asset valuation or other applications Extant (not in Use) assigned to an asset, when the inventory information for that asset is to be retained for legacy purposes Planned Removed assigned to an asset, when the asset has not been assumed by the municipality such assets built under plan of subdivision assigned to an asset, that is no longer in use but not deleted from the inventory 3

4 Unknown Deleted assigned to an asset, where its status is not known selecting delete from the picklist does not remove the asset from the system, but removes the asset from being used by any other MDW module. The asset is retained in the system for legacy purposes. Asset Material Select from the pick list the appropriate pipe material type. If material is unknown select not available from the list. GIS ID Insert the GIS ID number for the section. If GIS integration is being contemplated by the municipality consultation with a GIS provider should be completed prior to establishing the road section. Area If the asset is an upper tier asset in a lower tier municipality or vice versa, a list of available municipalities will be established by the profile administrator. A user may also choose graveyard for assets that you wish to delete from the inventory where the asset information is not required for legacy purposes. From the pick list select the appropriate option. PART 2 DIMENSION All fields of information in this section are optional. Any field which is not populated by the user will not appear on the final inventory page. Part 2 is applicable to all asset types in Figure 1. Although not all asset types contain all of the attributes listed in Part 2. Area Cross-sectional m 2 For a detention pond, area cross-sectional is the area of a cross sectional view of the detention pond taken along mid point of the pond.. For a rectangular pond the cross section would be taken along the longest side of the pond at the mid point of the pond. Measured to the nearest tenth of a meter square. Area m 2 For a detention pond, area is the plan view area of the detention pond. Measured to the nearest tenth of a meter square. For a sewer culvert, area is the cross sectional end area of the culvert. Measured to the nearest tenth of a meter square. 4

5 Average Depth - mm If upstream and downstream depths are known, use those fields. If unknown, average depth is an estimate of the average depth of the pipe from the surface to the top of the pipe and expressed as an average over the entire length of the section. Measured to the millimeter. Barrel Diameter mm Barrell diameter of a maintenance hole is the inside diameter of the maintenance hole measured at the mid point below the tapered cone top, if any. Measured in millimeters to the closest 100mm. Berm Elevation m Is the average geodetic elevation of the top of the berm surrounding a sewage lagoon. Measured in meters to the millimeter. Count - items This field is used for asset types were it is appropriate for the asset to be measured by a count. Count could be used for pooling of pipes although it is not recommended. Cover Diameter mm Is the inside diameter of the cast iron maintenance hole frame onto which the cover sits. Measured in increments of 10 millimeters on the inside of the maintenance hole frame. Depth m Depth for a sewer line is a measurement from the ground surface to the top of pipe measured at the downstream maintenance hole. Measured in meters to the closest millimeter. Depth for a maintenance hole is a measurement from the surface from the rim of the maintenance hole frame to the invert of the benching at the mid point of the maintenance hole. Measured in meters to the closest millimeter. Depth for a detention pond is the depth of the pond from the surface of the water to the bottom of the pond measured at the mid point of the pond. Measured to the millimeter. Depth for a sewer culvert is the depth from the surface at the centerline of the structure (if a road, from the crown of the road) to the invert of the culvert at centerline. Design Storage Volume m 3 For a sewage lagoon, design storage volume is the amount of effluent the lagoon is designed to retain. Measured to the nearest tenth of a meter cubed. 5

6 Design Water Level Elevation m For a sewage lagoon, the design water level elevation is the design maximum geodetic level the lagoon for the effluent. Measured in meters to the millimeter. Diameter mm Diameter is the inside diameter of the pipe measured from invert to obvert. Measured to the millimeter. Down Invert m Is the invert elevation of the pipe at the downstream maintenance hole. Measured in meters to the millimeter. For a Catchbasin with a pipe flowing in and flowing out of the catchbasin the down invert is the invert for the pipe outlet of the catchbasin. Measured in meters to the millimeter. Drop Diameter mm Is the diameter of the drop pipe at the downstream maintenance hole, if the maintenance hole is so equipped. Measured from invert to obvert. Drop Invert mm Is the invert elevation of the drop pipe at the downstream maintenance hole. Downstream Depth m Depth is a measurement from the surface to the top of pipe measured at the downstream maintenance hole. Depth is measured to the nearest tenth of a meter. Downstream Elevation m Is the invert elevation at the downstream end of the pipe or culvert. Downstream Elevation is measured to the nearest millimeter. External Diameter mm Is the outside diameter of a sewer device. Measured to the millimeter. Fill Depth, Fill on Structure m Is the height of the fill measure from the top of the structure to the surface (if a road, to the crown of the road) at the centerline of the structure. Measured to the closest tenth of a meter. Ground Water Depth m Is the depth where ground water may be encountered. Measured to the closest tenth of a meter from the surface. 6

7 Hydraulic Radius mm In a pipe flowing full, hydraulic radius is the area of flow divided by the wetted perimeter. Input the results of the calculation in the field. Height mm Height is used in conjunction with width for non-circular pipes. Height on a catchbasin is a measurement from the floor of the catchbasin to the top of grate. For catchbasins with a sloped top the measurement is to the center of the top on the sloped side. Measured to the millimeter. Inlet Diameter mm Is the inside diameter of the inlet pipe to a pumpstation. Measured to the millimeter. Inlet Elevation m Is the geodetic invert elevation of the inlet pipe to a pump station. Measured in meters to the millimeter Internal Diameter mm Is the interior diameter of a sewer device. Measured to the millimeter. Lagoon Bottom Elevation m Is the design geodetic elevation for the bottom of the sewage lagoon. Measured in meters to the millimeter. Length km Length of a sewer pipe is measured horizontally from centerline of maintenance hole to centerline of maintenance hole. Measured to the nearest hundredth of a kilometre. Length m, mm Length of a sewer pipe is measured horizontally from centerline of maintenance hole to centerline of maintenance hole. Measured to the nearest tenth of a meter for a measurement of length per meter or measured to the millimeter. Length of a detention pond is measured at the mid point of the detention pond. Measured to the nearest tenth of a meter. Length of a sewer culvert is measured horizontially along the centerline of the culvert from the upstream end to the downstream end. Measured to the nearest tenth of a meter. 7

8 Line Depth m For a catchbasin with a single outlet, the line depth is the invert elevation of the outlet pipe. Measured in meters to the millimeter from the top of the grate to the invert of the pipe. For slope topped catchbasins measured from the low \est opening of the slopped top to the invert of the pipe Liner Thickness m Is the thickness of a lagoon liner material. Measured in meters to the millimeter. Maximum Depth m Manufacturers specify a maximum depth of bury for various pipe sizes, which is dependant on the wall thickness of the pipe. In this field enter the maximum recommended depth of cover for a pipe. Measured to the nearest tenth of a metre from the surface to the top of pipe. Maximum Storage Volume m 3 For a sewage lagoon, the maximum effluent storage volume may be a lesser amount than the design storage volume. Measured to the nearest tenth of a meter cubed. Minimum Depth m In this field enter the minimum depth of cover for a pipe recommended for your area to prevent the pipe from freezing. Measured to the nearest tenth of a metre from the surface to the top of pipe. Nominal Diameter mm Actual pipe diameter may vary from the nominal diameter. In this field enter the nominal diameter. Number of Connections items Is a count of the service connections from the sewer main to property line on either side of the main. Number of Pipes in items Is the count of the number of pipes that carry effluent into a maintenance hole. Number of Pipes out items Is the count of the number of pipes that carry effluent away from a maintenance hole. Number of Pumps items Is the count of the number of permanent pump stations that are used to control water levels in a detention pond. 8

9 Number of Safety Platforms items Deep maintenance hole may contain one or more safety platforms. Number of safety platforms is the count of such platforms. Outlet Structure Outfall Elevation m For a sewage lagoon, the outfall elevation is the geodetic elevation of the invert of the outlet structure. Measured in meters to the millimeter. Platform Width m Platform Width is the horizontal distance measured from top of ditch slope on one side of the road to the top of ditch slope on the opposite side, including rounding. Measured to the nearest tenth of a metre. Primary Inlet Elevation m For a sewage lagoon, the primary inlet elevation is the geodetic elevation of the invert of the inlet structure. Measured in meters to the millimeter. Property Line Depth m Is the depth of a service connection or sewer device measured from the surface to the top of the service connection or device. Measured to the nearest tenth of a metre. Pump Discharge Elevation m Is the geodetic elevation of the discharge pipe or pipes from a pump station. Measured in meters to the millimeter. Roadway Width m By definition a Roadway means that part of a highway designed or intended for use by vehicular traffic and includes the shoulders. Roadway Width is the horizontal distance measured from edge of shoulder one side of the road to the edge of shoulder on the opposite side. Measured to the nearest tenth of a metre. Slope % For a sewerline, slope of the pipe from the upstream maintenance hole to the downstream maintenance hole and is calculated as the difference in elevation divided by the length in run from centerline of maintenance hole to centerline of maintenance hole. For a maintenance hole, slope of the benching across the maintenance hole from inlet to outlet. Sump Depth m Is the vertical distance measured from the lowest invert of a catchbasin or sewer device to the top of the floor of the catchbasin or sewer device. Measured to the millimeter. 9

10 Surface Area m 2 For a sewage lagoon, surface area is the plan view area of the lagoon. Measured to the nearest tenth of a meter square. Total Depth m Total depth of a maintenance hole is the depth of the structure measured during construction from the rim of the maintenance hole frame to the bottom (underside) of the maintenance hole floor. Measured to the nearest tenth of a meter. Up Invert m Is the invert elevation of the pipe at the upstream maintenance hole. Measured to the millimeter. For a Catchbasin with a pipe flowing in and flowing out of the catchbasin the up invert is the invert for the pipe inlet of the catchbasin. Measured in meters to the millimeter. Up Elevation m Is the surface elevation at the upstream end of the pipe. Up Elevation is measured to the nearest tenth of a meter. Upstream Elevation m Is the invert elevation at the upstream end of the pipe or culvert. Measured to the nearest millimeter. Wet Well High Level Elevation m Is the design high water level for a pump station. Measured in meters to the millimeter. Wet Well Low Water Elevation m Is the design low water level for a pump station. Measured in meters to the millimeter. Width mm Width is used in conjunction with height for non-circular pipes or culverts. Measured in millimeters. Width would be used with non-circular maintenance hole and catchbasins. Measured in millimeters to the closest 100mm. If the catchbasin or maintenance hole is rectangular a second width attribute would need to be added by the profile administrator. Width of a detention pond is measured at the mid point of the detention pond. Measured to the nearest tenth of a meter. 10

11 PART 3 SURROUNDINGS All fields of information in this section are optional. Any field which is not populated by the user will not appear on the final inventory page. Pick lists are populated and edited by the profile administrator. Part 3 is applicable to all asset types shown in Figure 1. Backfill Type From the pick list, select the type of backfill used to fill the pipe excavation. Bedding From the pick list, select the type of bedding used for the pipe. Roadside Environment From the pick list, select the appropriate roadside environment for the road section. Rural Roadside Environment is defined as being: areas with sparse development or where development is less than 50% of the frontage, including developed areas extending less than 300 metres on one side or 200 metres on both sides and no curbs and gutters. Semi-Urban Roadside Environment is defined as being: development exceeds 50% of the frontage for a minimum of 300 metres on one side or 200 metres on both sides and no curbs and gutters, with or without storm/combination sewers or curb and gutter on one side only without storm/combination sewers or for subdivisions, the majority of the lot frontages are 30 metres or greater Urban Roadside Environment is defined as being: curb and gutter on both sides with or served by storm/combination sewers or curb and gutter on one side with or served by storm/combination sewers or reversed paved shoulders with or served by storm/combination sewers for subdivisions, the majority of the lot frontages should be less than 30 metres. Soil Condition From the pick list, select the soil condition for the sub grade material. Surf Type Is the type of surface over the pipe for example paved, grassed, etc. Terrain and Soil Type From the pick list, select the predominant soil type and terrain through which the sewer is located. 11

12 PART 4 SEWER SECTION All fields of information in this section are optional. Any field which is not populated by the user will not appear on the final inventory page. Pick lists are populated and edited by the profile administrator. Part 4 is applicable to all asset types in Figure 1. Although not all asset types contain all of the attributes listed in Part 4. Alternate Asset ID Identifies the historical or legacy asset naming system or a previous asset ID numbering. Architectural Elements Describe any architectural elements that may be located at a detention pond including; signs, fountains, sculptures, etc, ASTM CSA Is the class of pipe. For example SDR35. Backflow Preventor Type Identifies the type of backflow preventor Base Type Base Type is either precast or made of unreinforced portland cement concrete poured into a basin formed in the bottom of the manhole excavation. In the field insert either precast or poured in place. Building Exists Check the tick box if a building exists on the site of the detention pond that may house pumps, values or other appurtenances of the detention pond. Check the tick box if a building exists at a pump station. Capacity Capacity of a detention pond is different in every situation, Insert in this filed the capacity of the detention pond in. Capacity of a pump station is the volume of storm water or effluent in litres per second that can be pumped by the pump station. 12

13 Catchbasin Type For this field there is a choice, either manually enter the catchbasin type in this field or alternatively use the field titled structure type and select structure type from the pick list. Channel Type Cast-in-place concrete manholes have wastewater channels formed by hand often referred to as benching. In this field insert either factory benching or field benching. Classification For a sewerline insert one of the following classifications: combined, wastewater, storm For an inlet, there are four types of stormwater inlet, insert one of the following classifications: curb-opening inlets, grated inlets, combination inlets and multiple inlets. Clean Out Private Clean outs can be located inside or outside a building or on the property line.. Insert in this field: interior, exterior or property line. Clean Out Type In this field identify whether or not an exterior clean out is above grade, below grade or below grade with a detectable cap. Connection Type From the picklist select the appropriate method used to connect a service to the main or for some asset types options for appropriate connection types are; saddle, strapped saddle, tee or wye Cover Type For a catchbasin manhole or maintenance hole, input the appropriate OPSD maintenance hole cover number. Crossing Skew Crossing skew is the angle between a line projected at a right angle (90 ) to the centerline of a road and the angle of the centerline of a sewer culvert. Culvert Crossing Type From the picklist, select road cross culvert or entrance culvert. Design Flow Is measured in litres per second. 13

14 Design Level Design level is the design maximum flow elevation for the pipe or detention pond. Detention Pond Type Detention ponds may be either a dry pond or a wet pond. In this field enter one of those two options. Driveway Exists Check the tick box, if a driveway exists to the pump house. DWF Cap or DWF Actual Insert in this field the Dry Weather Flow capacity. Electrical Elements Options for completing this filed are: A typical pump station uses a three-phase electrical system that is able to operate higher horsepower loads because the current is distributed over the three phases. The main disconnect switch may be fused, a circuit breaker, or simply a disconnect switch to allow the isolation of the entire electrical system within the pump station. There is also a transfer switch that may be manually or automatically operated when the utility power source is lost. Pump stations also have a Motor Control Center that houses the controls for all the motors and electrical equipment operated within the station. Insert in this field the electrical elements that best describe the pump station. Encasing Material Is the material used to encase the pipe such as concrete, insulation, steel, etc. Equiv Pop Served The equivalent population is the actual population which is used to determine the amount of effluent the pump station will need to handle. Fence Exists Check the tick box, if a fence exists that surrounds the detention pond. Fibre Optic Use Identifies whether or not a pipe is used as a conduit for fibre optic cable. Insert Yes or No in the field. Flow Direction Measured as North, South, East or West or could be used to identify if the flow in the pipe is against pipe grade, necessary for reverse grade pipes or force mains. Flow Restrictor Indicate the type of flow restrictor, if any, attached to the inlet pipe. 14

15 Flow Restriction Type Flow restrictors may be a weir, check dam or orifice. Insert in this field the appropriate flow restrictor type. Flow Type From the pick list select the appropriate types of effluent in the pipe or for some asset types manually insert the effluent type Generator Set In this field insert the type of standby power that may be available which includes a diesel generator or direct drive diesel engine. Grate Type For a catchbasin, input the appropriate OPSD catchbasin frame and grate number. Has Aux Power Check the tick box if, a maintenance hole has auxiliary power supply. Has Benching Check the tick box if, a maintenance hole has benching. Has Bypass Check the tick box if, a sewer device has a bypass. Has Cleanout Check the tick box if, if the service connection has a cleanout at property line Has Control Has Drop Pipe Check the tick box if, the maintenance hole has a drop pipe. Has Foundation Drain Connection Check the tick box if, the storm service has a connection to the foundation drains. Has Flowthrough Plug Has Frost Lug Check the tick box if, the maintenance hole has a frost lug around the exterior perimeter of the maintenance hole to prevent/minimize frost upheave. Has Grate Check the tick box if an inlet has a grate covering the entrance. 15

16 Has Insulation Check the tick box if, the service connection is insulated. Has Overflow Weir Combined manholes are sometimes equipped with an overflow weir. When the quantity of rainfall exceeds capacity of the combined sewer the weir allows the surplus to flow to the storm sewer. Check the tick box if an overflow weir exists. Has Roof Drain Connection Check the tick box if, the storm service connection has a connection to roof drains or eavestrough. Has Sump Check the tick box if, the inlet has a sump. Has Trace Wire Check the tick box if, a trace wire is in place for future locates. HGL Model Identifies the type of hydraulic model used for design flow and capacity calculations. Is Drop Pipe Check the tick box if the downstream maintenance hole has a drop structure. Is Drop MH Check the tick box if, the maintenance hole is a drop maintenance hole. Is Metered Check the tick box if, the effluent in the maintenance hole is metered for volume. Is Prefabricated Check the tick box if, the pumpstation is prefabricated. Is Sump Check the tick box if the catchbasin has a sump. Joint Type Options for joint type would be; butt joint, wrapped butt joint, bell and spigot, gasket bell and spigot, etc Junction Type Sewer junctions are used to join large diameter trunk sewers when the connection cannot be made in a manhole. In this field describe the junction type. 16

17 Ladder Type Insert the appropriate OPSD number Lock Type In this field describe the type of lock used to secure the maintenance hole cover. Line Type Identify the type of effluent; storm, combined, sanitary Liner Material Describe the material used to line a lagoon. Liner Type Options for liner type are impermeable or porous Maintenance Hole Type Insert the appropriate OPSD number. Manufacturer Insert the name of the manufacturer of the sewer device Make For a catchbasin insert the OPSD number in this field Mechanical Elements Describe the mechanical elements that may be part of the pump station. Model Insert the model number of the sewer device. Number of Pipes Insert the total number of pipes flowing into and out of the maintenance hole. Old asset ID Identifies the historical or legacy asset naming system or a previous asset ID numbering, see alternate asset ID. Outlet Structure Control Type Outlet structure types include automated and manual. Pump Station Type Options for pump station type are; waste water, storm, combined. 17

18 Purpose Insert the purpose for the sewer structure. Rated Capacity The amount of wastewater that a collection system will convey is determined by careful analysis of the present and probably future quantities of domestic, commercial and industrial wastewaters, as well as anticipated groundwater infiltration and surface water inflow produced in the service area. In this field identify the desin capacity of the sewer line. Safety Grates or Safety Grate Type Insert the appropriate OPSD number. Safety Platform Type Insert the appropriate OPSD number. Serial Number Insert the sewer devices serial number. Service Type Option for service type are: storm, waste water or combined. Structure type could be used as an option. Sewer Function Sewer Function identifies the type of effluent in the pipe; storm water, sanitary or combined sanitary and storm. Shape Identifies the shape of the pipe; round, elliptical, oval, square, rectangle, etc Steps Type Insert the appropriate OPSD number. Structure Type From the picklist select the appropriate structure types or for some asset types manually insert the appropriate structure type. Surface Type or Surf Type Options for this field would include; boulevard, sidewalk or pavement Surface Material Options for this field would include; grass, concrete, asphalt, surface treatement, gravel, etc 18

19 Total Capacity Is the total pumping capacity of a pump station. Measured in litres per second. Total Infli Contri The total amount of groundwater that seeps into the pump station that has to be accounted for in the design and pumping capacity. Total Inflow Contri The total amount of water discharged into the pump station from sources such as, but not limited to, roof leaders, cellars, yard and area drains, foundation drains, cooling water discharges and through holes in covers, etc. User Type. A user types would be: residential, commercial or industrial Utility Poles Check the tick box, if utility poles are used to supply hydro to any pumps/buildings. 19