Mapping storm water management facilities in Old Towne, Havre de Grace, Maryland
Cora Summerfield
Mentored by Mr. Timothy Palmer
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Potential storm water systems
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Map 2 (left): Shows the storm water management
system in Havre de Grace with storm water inlets,
outlets, manholes, and water ways in ArcGIS®.
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Image 1: Shows the three-dimensional image of Havre de Grace with
exaggerated elevations produced in ArcGlobe®. The center crest is located on
Freedom Lane. This was used extensively for analysis.
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Map 1: Shows a close-up of the updated Havre de Grace impervious area map
in ArcGIS®.
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Discussion
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Map 3 (above): Shows a close-up along St. John
Street of the storm water management system in
Havre de Grace with storm water inlets, outlets,
manholes, and water ways in ArcGIS®(same map
legend as Map 2).
Introduction
Methods
In 2010, the EPA enacted the Watershed
Implementation Plan (WIP) to reduce the amount of
pollution, runoff, and sediments entering the
Chesapeake Bay watershed. Havre de Grace did not
have a completed and accurate digital map of the
storm water system which was needed to quantify
inputs and reductions. Havre de Grace’s paper map
was from 1970. In order to determine potential and
needed areas for storm water structures, an accurate
and completed map of Havre de Grace’s storm water
system had to be created. The area being observed
and mapped is east of Juniata Street, also known as
Old Towne, Havre de Grace.
A Trimble® GPS was used to ascertain accurate storm water inlet, outlet,
manhole, pond, and trench locations. The points were transferred to ArcGIS® and
connected based on the 1970 map data and field observation (Map 1).
Data on impervious area, empty lots, and parks was retrieved from Harford
County GIS servers to determine potential storm water facility locations (Map 2).
The size and location of each identified area was taken into consideration when
determining the kind of storm water structure that would best suit each area (e.g. a
storm water management pond would not be appropriate in a recreational park).
Drainage areas were determined based on updated storm water systems and a
three-dimensional land elevation image produced in ArcGlobe® as seen in Image 1.
The final data was put on a website to be available to Havre de Grace
Government for emergency preparedness (i.e. fuel spills, fires, etc.), city planning
(i.e. new buildings, building updates), and EPA Compliance (i.e. rules, laws).
Old Towne, Havre de Grace has a defined ridge
running along Freedom Lane which splits the storm
water runoff evenly (Image 1). Approximately half
of the water directly enters the Susquehanna River
and half enters Lily Run before entering the
Susquehanna River. All of the storm water
management facilities are built to accommodate the
natural ridge.
Lily Run floods when there is a significant amount
of rain due to the increased flow of water. More
storm water facilities would assist in the steady flow
of storm water into Lily Run as well as cleaning the
water before entering the Chesapeake Bay watershed.
This project could be further developed by creating
more accurate storm water system drainage areas
using the lines of elevation. In addition, the project
could include exploring ways to decrease flooding of
Lily Run.
Acknowledgments
Special Thanks to Mr. Timothy Palmer (mentor), to
Mr. Jeff Keithley and Mrs. Dianne Klair (Havre de
Grace), to Ms. Jessica Petty, Mrs. Erica Sutherland,
and Mr. Frank Middleton (Staff Scientists, CEM) and
to Mrs. Yvonne Gabriel (faculty advisor).