Stormwater drainage system GIS pilot project

[From the U.S. Government Printing Office, www.gpo.gov]

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Storm Water
ux Draina e System
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GIS Pilot Project

October 1, 1996

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Funding Source

This project was funded in part by a grant from the Office of State

Planning, New Hampshire Coastal Program, as authorized by the

National Oceanic and Atmospheric Administration (NOAA), Grant

Award Number NA570ZO320.

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TABLE OF CONTENTS
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I Narrative
I Project Summary
I Maps
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NARRA TIVE

The City of Dover was awarded supplemental NH Coastal Program Funds to

develop a Geographic Information System pilot project. The project goal was to

design and build a database layer for the stormwater drainage system in a portion

of Dover from which the entire stormwater drainage system could be built over

time. The pilot area is located in the downtown area of Dover where the highest

concentration development occurs adjacent to the tidal portion of the Cocheco

River. The development of a GIS data layer for the stormwater drainage system is

important for several reasons. It will provide timely access to the stormwater

system for emergency crews in the field responding to spills that occur on City

streets. It will allow the City Engineer to model stormwater management on

existing system and proposed modifications to the system. It will allow the DPW

to create a maintenance program to inspect and clean the drainage structures.

Maintenance directly affects the ability of the stormwater system to reduce

sediment load reaching the discharge points.

The NH Coastal Program provided a maximum of $ 10,000 for the project with the

City of Dover providing match as in kind services.

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1 roject Summary
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PROJECTSUMMARY

The pilot project consisted of three parts. Project design, data collection, and data

conversion. The project design evolved as the project progressed. Our initial

thoughts about the best way to capture the data were not the method we used. We

believed that a GPS data collector would be the most efficient way to collect

structure locations then fill in the pipes between. After analyzing our existing hard

copy records, the intimate knowledge that some DPW personnel who maintain the

stormwater drainage system possess, and the limited resources we had to complete

the project we settled on a strategy that utilized our DPW personnel to highest

advantage. This strategy paid big dividends as the maps the DPW Drain Division

Supervisor prepared which we thought would be a preliminary map were so

meticulously done that we were able to use the for data conversion purposes. We

consider ourselves most fortunate to have had Dave Quint prepare these maps. As

a result of the map quality we hired Integrated Mapping Services Inc. of

Holderness NH to digitize a small portion of the project area as a test. Integrated

Mapping Services Inc was chosen because of their experience with data conversion

and their ability to provide the graphic maps and linkages in the same format used

by the.City's GIS without translations. The test area showed that the maps

prepared by Dave Quint were of high enough quality for project development.

The success obtained in converting the test area maps to digital maps cleared the

way to continue converting the remaining maps in the pilot project area. In concert

with the data conversion the City employed the use of student interns to collect

field data about each stormwater drainage structure. The data collected included

such items as depths of inlets and outlet pipes, pipe diameter, pipe material, size of

sump, and condition of the structure. These records were then loaded into a

relational database linked to the structures and pipes.

A map of the pilot project area is included in the report as well as a sample of the

stormwater drainage system. The pilot project was performed economically using

the available resources in the City and the services of a contractor.

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CITY OF DOVER

STORMWATER DRAINAGE SYSTEM

G.I.S. PILOT PROJECT AREA

ASTAL SERVICES CTR LIBRAR

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