04_Penfield_Data_Collection_Book

Town of Penfield

Sanitary / Storm

Mapping

Data Collection

Field Book

Sewer/Storm Mapping Project

Phase Two Regulations

The current status of the sewer mapping project, as of August 2005, is that the

majority of the town’s sewer lines and storm mains have been mapped so long as the

maps have been scanned. The major subdivisions have been added and the major

extension projects have been added so long as the maps were scanned.

The current sewer print out has been handed to Sewer Department to check and

add scan numbers. The next big portion of the project is to collect the field data and a

process for doing that, is still under consideration.

A problem has arisen and needs to be considered for the completion of this

project. The problem is that some of the small storm/sewer projects have been marked

with the GPS unit and could be placed into the sewer network in Arc Map. The problem

is that the current way that the maps are added is by stretching them to fit the current

parcel layer. In short, the problem with mixing GPS located marks and scanned marks is

that they could be off by as much as 20 feet. Now from an office view that may

excellent, but from the field stand point, that margin of error is worse than guessing.

To have a proper system mapped with all the needed data that could be utilized

for the purposed uses, the town really needs to look into having the whole system GPSed.

Obviously to GPS the whole system would take a lot more time and a lot more money but

the end product would be a system that a minimal margin of error, actual size grates, and

accurate invert data. Not only would the system benefit from this style of mapping but

also it would give the town a chance to inspect each structure and comment on what

repairs may be needed and what if any miss connections between storm and sanitary may

exist.

Other benefits to the town from this system is that when it is complete it can be

used to locate man holes in the winter, help support the local fire department during any

hazardous material spill, and the need for inspections and maintenance of the current

system.

Although this style will cause headaches and appears as if we are starting over

again, which we really are. The end system will be much better and serve the public

much more efficiently and accurately then the current mapping style.

Procedure to input map scans:

1. Place a copy of the scanned map in:

G:\OriginalGISData(restricted)\Engineering\sewerscans

2. To place the scan into the Arc Map go to the tool box (Red Box icon), from there

open the copy raster command, find the correct number scan from the right folder and

start the raster process.

3. Once the map is in the system find an anchor point on the map and click on the

georeferencing tab: click the add control point icon, then click your anchor point one the

scan first then find the same point on the main map.

4. Repeat this at least once more for a total of two control points. Make sure your

control points are close to the data point you will be entering.

5. Start editing and enter each data point, making sure you have the correct main

size, type of manhole, or size of catch basin.

6. Save often.

Summer Intern 2005

Kenneth Meding

Procedure for Elevation Data Recording of System Structures

The Elevation Data for System Structures is the next step for the completion of the Phase

Two Regulations for Strom and Sanitary Mapping. The data that needs to be recorded is

listed out in the following procedure.

Step One: Data Sheet

Use the correct data sheets located in the back of the Data Collection Field Book.

Fill out the current data on the sheet in regards to the date and weather conditions.

Step Two: Location of Structure

The location of the structure can be determined by using the Quad Sheets for that

type of system. The first sheet in the Quad Sheets section of the Data Collection Field

Book is an overview of all of the Quad sheets for the town. Use this sheet to get a idea of

which Quad the structure might be in. Using the more detailed 16 Square Sheets that

follow the overview sheet, find the exact Quad name for that structure. Use land marks

on the map like road intersections, road bends, and counting structures back from a

known location, to help ensure that right Quad name is used.

Step Three: Naming of the Structure

The procedure for naming structures is in the Data Collection Field Book and

should be followed to name any structure. Along with naming the structure also find the

watershed or main sewer district that the structure lies in. Record that data on the sheet.

Step Four: Rim Conditions

As the structure is being named and the data sheet is being filled out, use the GPS

unit to find the elevation of the rim. This measurement is vital to all other data necessary

to complete of the Phase Two Regulations. Also determine the size of the rim and the

type of the rim, whether it is an open or closed structure. Record that data on the sheet.

Step Five: Inspection of Conditions

Remove the cover (If covered) of the structure and inspect the conditions of the

coating, the bench, the steps, and record any data and comments that are necessary on the

data sheet.

Step Five: Elevations and Diameters

The elevations and diameters of the laterals in any structure can be measured

without the need to get into the structure. Use the following steps to gather the necessary

data.

USE THESE STEPS IF ELEVATION MEASURMENT IS DIFFCULT

Step ABLE

Using a compass find the directions of each lateral

Step BAKER

Using the Elevation/Diameter Tool with the Elevation Tip on the

end, measure IN INCHES the distance from the inside of the rim to about the center of

the lateral. This distance is the hypontuse of a triangle(H-Value).

Step CHARILE

Using a tape measure, measure IN INCHES the distance from the

inside of the rim, the same spot used to step BETA, to center of the lateral on the top

of the structure. This distance is the horizontal distance between the two(X-Value).

Step DOG

With two sides of the triangle known use the Elevation Sheets in

the Data Collection Field Book (The H-Values are on the right and left sides, the X-

Values are on the Top and Bottom, and the Y-Values are in the chart) to find the vertical

distance between the rim and lateral. When you know the true vertical distance from the

rim to the center of the lateral then subtract that vertical distance from the elevation of the

rim. This will give the true elevation of the lateral. Remember to convert back to feet.

Step EASY

Using the Elevation/Diameter Tool with the Diameter Tip on the

end, measure the diameter of each lateral and record the values.

Step FOX

Repeat all steps for each lateral and record data.

USE ACCOMPING DRAWINGS AND EXAMPLES FOR HELP IF NECESSARY

Step Six: Pictures

If requested take pictures if possible for inspection purposes. Record picture

number and roll number on the data sheet.

Step Seven: Conclusion

Add any comments necessary and return cover to structure.

Classification Procedure for System Structure

The naming of structures for the phase two regulations of Strom and Sanitary systems

will consist of five parts. An example is below and each part is explained in full.

System – Type of structure – Quad – Year of installation – Number within quad

Example:

ST - MH - B26 - 2005 – 3

System: The system part referrers to which one of the two systems the structure belongs

to. The only options are Sanitary (SA) or Storm (ST).

Type of structure: Types of structures to be inspected and named are: Man Holes (MH),

Catch Basins (CB), Inlets (IL), Outlets (OL), Clean Outs (CO), and Outfalls (OF).

Other consideration needs to be taken into account as to whether the structure is open or

closed. This should portrait to the storm structures only. If a storm structure is open to

then the part with the Type of structure will be followed with an (O). Example below:

ST - MHO - B26 - 2005 – 3

Catch Basins are to be considered to be open already and do not need to have the extra

notation.

Quad: In the Sanitary/Storm Mapping Data Collection Field Book there are quad maps

made from the Arc View mapping of the two systems. These maps are not complete and

not up to date, but the Quad location names will not change and will work well for the

Quad part of the classification of structures. The use of the Quad name should be done in

an alphanumeric fashion. The letter should be first and followed by the number. If a

structure falls onto the Quad lines on the map pages then the best guess by the inspector

is to be taken and used. To indicate that a guess had to be made follow the Quad part

with an (*). Example below:

ST - MHO - B26* – 2005 – 3

Year of installation: If the year of installation is known then it should be used for this

part. If the year is not known then the current year that the inspection is taking place will

be used and followed by and (*) to indicate that the year of installation is not currently

known. Example below:

ST - MHO - B26* – 2005* – 3

Number within quad: The number within the quad that a structure lies will be counted

from the upper most left corner first and ending the bottom most right corner. If a

structure falls onto the Quad lines on the map pages then the best guess by the inspector

is to be taken and used. To indicate that a guess had to be made follow the Number

within quad part with an (*). Example below:

ST - MHO - B26* – 2005* – 3*

Elevation/Diameter Tool

The Elevation/Diameter Tool is a simple tool made form EMT that has inches

measures out on the length of the tool. These inch marks will be used to determine the

distance to find the true elevation of a lateral without having to enter a manhole.

The tool needs to have one end with threads to allow the addition of other tips to

increase the accuracy of measurements.

The Elevation Tip is nothing more then a blunt end to the EMT. The tip could be

paint a bright color so that is can be seen within the manhole.

The Diameter Tip is nothing more then a ruler added to the end of the EMT to

determine the diameter of laterals. The T-section of the tip needs to have inches marked

out on it for measurements.