I-29_20191206_FINAL_NHC_WIP_SCM_Field_Manual

SCM Inventory and
Assessment Field Plan
New Hope Creek & Little Creek
Watershed Improvement Plan
December 2019 Durham, North Carolina
PREPARED FOR:
City of Durham
Public Works Department
Stormwater & GIS Services Division
CITY OF 101 City Hall Plaza, Third Floor
DURHAM Durham, North Carolina 27701

Kimley>Morn
AECOM
New Hope Creek & Little Creek
Watershed Improvement Plan
SCM Inventory and Assessment
Field Plan
City of Durham
Public Works Department
Stormwater & GIS Services Division
101 City Hall Plaza, Third Floor
CITY OF Durham, North Carolina 27701
DURHAM
December 6, 2019

Kimley-Horn
AECO M
Table of Contents
1.0 Introduction................................................................................................................................. 1
1.1
Watershed Improvement Plan..................................................................................................
1
1.2
Stormwater Control Measure (SCM) Inventory and Assessment .............................................
1
2.0 Assessment of Existing SCMs.....................................................................................................
2
2.1
Fieldwork Preparation..............................................................................................................
2
2.2
Field Data Collection................................................................................................................
3
2.2.1
Background Information...........................................................................................................
3
2.2.2
Control Structure Data.............................................................................................................
3
2.2.3
Outlet Data..............................................................................................................................
4
2.2.4
Presence of Level Spreader....................................................................................................
4
2.2.5
Access Limitations...................................................................................................................
4
2.2.6
Site Constraints.......................................................................................................................
4
2.2.7
Characterization of Receiving Waters......................................................................................
5
2.2.8
Retrofit Potential for Existing SCMs.........................................................................................
5
2.2.9
Contributing Drainage Area Addition........................................................................................
6
2.2.10
Site Recommendation..........................................................................................................
7
2.2.11
Standard Photographs.........................................................................................................
7
2.3
Data Management...................................................................................................................
7
3.0 Assessment of Potential New SCMs...........................................................................................
8
3.1
Fieldwork Preparation..............................................................................................................
8
3.2
Field Data Collection................................................................................................................
8
3.2.1
Background Information...........................................................................................................
8
3.2.2
Characteristics of the Site........................................................................................................
8
3.2.3
Potential New SCM Type.........................................................................................................
9
3.2.4
Contributing Drainage Area Addition........................................................................................
9
3.2.5
Characterization of Receiving Water......................................................................................
10
3.2.6
Standard Photographs...........................................................................................................
10
3.3
Data Management.................................................................................................................
10
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Appendices
Appendix A: Watershed Map
Appendix B: SCM Measurement Guidelines
Appendix C: Existing SCM Field Datasheet
Appendix D: New SCM Field Datasheet
New Hope Creek & Little Creek Watershed Improvement Plan — SCM Inventory and Assessment Field Plan

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1.0 Introduction
1.1 Watershed Improvement Plan
The New Hope Creek and Little Creek Watersheds combine to form an approximately 83
square mile watershed within Orange and Durham Counties (Appendix A is an overview map of
the watersheds in Durham County). Both New Hope Creek and Little Creek discharge into
Jordan Lake (WS IV, CA, NSW). The land use in the watershed is primarily forest and low
density residential in Orange County and a mix of residential, commercial, and forest in Durham
County. Approximately 18.7 square miles of the watershed is within the City of Durham (City)
limits. Sandy Creek and Mud Creek are the key tributaries in the New Hope Creek watershed.
Originating in Chapel Hill, both Bolin Creek and Booker Creek meet to form Little Creek.
The purpose of the SCM Inventory and Assessment of the New Hope Creek and Little Creek
Watershed Improvement Plan (WIP) is described below. The primary goals of the WIP are to
better understand how to improve water quality and restore watershed function to the
watershed, identify and prioritize projects that can improve water quality, and aid the City with
compliance of the Jordan Lake Rules. Portions of the watersheds that are within the City of
Durham limits are the focus of the WIP.
1.2 Stormwater Control Measure (SCM) Inventory and
Assessment
The SCM Inventory and Assessment Field Plan focuses on acquiring data to meet goals of the
New Hope and Little Creek Watershed Improvement Plan (WIP), including (1) acquisition of
data to develop a watershed model, (2) identification of retrofits to existing SCMs to improve
stormwater treatment and (3) the evaluation of potential new SCM locations to treat areas not
currently served. The specific objectives of the SCM Inventory and Assessment are to:
1. Collect physical attributes on the components of SCMs so that they may be modeled in
PC-SWMM
2. Evaluate the conditions of existing SCMs and provide photo documentation
3. Record information on the surrounding site including access, utilities and land use
4. Recommend potential retrofits for each existing SCM evaluated
5. Evaluate potential new SCM locations
6. Collect detailed information on potential new SCM locations including recommendations
for specific types of SCMs at each site
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7. Populate a geodatabase of existing and new SCM sites within the City of Durham New
Hope and Little Creek Watersheds
Identification of existing and potential new SCMs to be evaluated will be completed through a
GIS analysis performed by Kimley-Horn, Inc., staff. Field crews will have 12 field days to
complete a field inventory and assessment within the City of Durham limits of up to 120
opportunities for stormwater retrofits, which will consist of retrofits to existing SCMs and
installation of new SCMs.
2.0 Assessment of Existing SCMs
Assessment will be performed on SCMs that have been identified and passed a pre-screening
by Kimley-Horn staff. Field evaluation of the SCMs will involve characterization of the site (land
use, access, and utility conflicts), collection of quantitative data on the SCM (control structure
and outlet data), recommendations for SCM retrofits, and photographic documentation. If any
maintenance issues are encountered at an existing SCM, comments will be added to the notes
portion describing said issue (for example, erosion, blocked inlets, outfall, or orifice, invasive
vegetation, illicit discharges, utility line exposed or visibly damaged, etc.).
2.1 Fieldwork Preparation
A handheld tablet with Collector for ArcGIS installed will be provided to each field team for the
existing SCMs to be evaluated. The tablet will contain the GIS layers deemed necessary (such
as utility pipe layers, property lines, and FEMA floodplains) to navigate to and complete the field
tasks for each existing SCM. The tablet will be used to fill out the field forms for each SCM,
record the SCM GPS location, and take the required photos. The camera within the tablet will
be used for all photo documentation, unless technical issues require the use of a backup
camera. An additional camera will be carried to provide photos for social media and other
outreach. A photo log will be completed for that camera to describe the location and general
description of the photos.
This field manual should accompany each field team as a reference manual since it includes
more detailed descriptions for each SCM parameter to be collected than provided on the tablet
device.
Each field team will need the following equipment for each day of field work (at a minimum):
• An appropriate tablet with GPS location capability
• SCM Assessment Field Plan
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• 100' and 300' measuring tape
• Survey rod or pocket rod (min 10')
• Backup hard copy data sheets and backup camera (can be kept in field vehicles)
• Waders / knee boots
• First aid kit (can be kept in field vehicle)
• Safety vest — reflective orange or yellow
• Identification credentials
• Personal items such as water, hat, sunscreen, insect repellant, etc.
• Informational placard
• Flashlight
2.2 Field Data Collection
There will be two field teams visiting sites in the watershed on each field day. Each field team
will consist of one Kimley-Horn field lead and one Three Oaks employee. Data will be collected
using a tablet running Collector for ArcGIS software. Field datasheets will serve as back-up if
there is a problem with the functionality of the tablet. Sample Field datasheets are included in
Appendix C. After data is collected for each SCM, the SCM will be highlighted on the
watershed -scale map to depict that data collection has been completed.
2.2.1 Background Information
The field crew will choose the Existing SCM form from Collector for ArcGIS. Information
on the SCM site and field crew doing the evaluation will be entered first into the data
from. This includes the SCM site identification code, subwatershed code, date, and the
characterization of surrounding land use as Low Density Residential, High Density
Residential, Parks and Open Space, Commercial, Industrial, Institutional, or Other. Next,
the type of SCM must be entered. Options cover all those identified in the GIS
prescreening: Wet Pond, Dry Pond, Constructed Wetland, Pocket Wetland, Bioretention,
Sand filter, Treatment Swale (Wet or Dry), Regenerative Stormwater Conveyance, and
Other. The HSG soil group for the site will also be entered from the tablet. Also, for
vertical measurements, if a datum other that the bottom of the SCM is used, provide that
information in the notes.
2.2.2 Control Structure Data
In order to properly model existing SCMs, physical parameters must be identified and
measured. Appendix B contains a figure entitled SCM Measurement Guidelines, which
depicts measurements of control structure data and outlet data.
Length and width of the SCM (taken at normal pool for wet ponds, dry ponds, and
stormwater wetlands) is the first measurement taken. This will be done in the field for
smaller SCMs where taking measurements is feasible. Large SCMs may be evaluated in
the office using GIS aerial photographs. Next, the number, type, and size of inlets are
described. Inlets into most SCMs will be an open channel or a pipe. If the inlet is an
open channel, the cross -sectional area of that channel will be measured and if it is a
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pipe, the inside pipe diameter will be measured. In this section the presence of a forebay
at the inlet will also be indicated.
2.2.3 Outlet Data
An SCM will either have a riser structure (refer to diagram in Appendix B) or an outlet
pipe that serves as the primary outlet. The presence or absence of a riser structure will
be input into the data form. If there is a riser structure, the field team will record the
dimensions of the top of the riser (diameter or width and length). The field team will also
note whether there is an orifice (a small circular opening or pipe) lower on the structure
that sets the water level for the SCM. The distance from the bottom of the SCM to the
invert of the orifice (referred to as the Stage) will be recorded as the Orifice Stage along
with the dimensions of the orifice. If there is a second orifice, the stage and dimensions
of that orifice will be entered.
The Primary Outlet for the SCM will be located on the riser structure if one is present;
otherwise it will be its own structure. The primary outlet may be one of the following: a V-
notched weir, weir (broad crested or the length of the top of the riser), orifice, or an
underdrain. If it is a weir, the weir length will be recorded (this will be the circumference
of a pipe or riser structure). If it is an orifice, the diameter, or width and height, and stage
(distance from the bottom of SCM to the invert) will be recorded.
The Primary Outlet is connected to an outfall, which is where water completely leaves
the SCM (See diagram in Appendix B). The diameter of the outfall and material of the
pipe will be recorded. Note the presence or absence of an emergency spillway and the
stage and length of the spillway invert above the SCM bottom. Additionally, note whether
or not the SCM appears to be functioning as designed.
2.2.4 Presence of Level Spreader
Level spreaders may be located below an SCM outfall. The presence or absence of a
level spreader will be recorded. Vegetation often covers the level spreader post -
construction, so it may not be outwardly apparent and could require examining the
ground surrounding the outfall area.
2.2.5 Access Limitations
The level of accessibility to an SCM will aid in determining if it is a candidate for retrofits.
Accessibility will be categorized as by foot or by vehicle access.
2.2.6 Site Constraints
The field team will identify any possible constraints that may hinder the feasibility of
doing retrofits or maintenance on the existing SCM. The presence of utilities on site that
could interfere with retrofits, and utility lines within the immediate vicinity of the SCM
must be recorded. Options include water lines, sanitary sewer lines, gas lines, telecom,
and power lines. The potential presence of wetlands and the possible encroachment into
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riparian buffers are also options for site constraints. For the purposes of this project
riparian buffer widths are assumed to be 50 feet on perennial and intermittent streams.
Incompatible land use can also be selected for sites located in areas that may be
restrictive to further development such as community open space or parks. Driveways,
roads, parking lots, and/or houses or other structures in the vicinity may also be a
constraint. Steep slopes, topography of the site, or site accessibility may also restrict the
site. Two site constraints can be recorded in this section. Select the most restricting
constraints observed (if any) and if there are additional conflicts they should be recorded
in the notes section.
2.2.7 Characterization of Receiving Waters
This section is for characterizing the waterway or water body receiving discharge from
the SCM. Choices include a perennial/intermittent stream, pipe, ditch, and "other." The
field team will use its best judgment to determine if it is perennial/intermittent. An
example of "other" would be a situation where the outlet connected directly to a storm
drain system.
Indicate if there is a headcut observed at the outfall. The immediate and directly
downstream area of the SCM that is reasonably accessible should be observed.
Generally, investigate 50-100 feet downstream of the outfall if feasible.
2.2.8 Retrofit Potential for Existing SCMs
This section moves beyond characterization of the existing SCM to an evaluation of
potential retrofitting activities where there are currently none to facilitate water quality
improvement of the existing SCM. There are three types of retrofits examined: structural
retrofits, volume retrofits, and add -on retrofits. Selections should be made keeping in
mind the potential for combinations utilizing options from more than one category.
Proposed retrofits are not intended to diagnose or remedy maintenance issues. If there
are any maintenance issues, they should be noted in the notes section but not included
as a retrofit opportunity. For example, if the SCM has clogged orifices on the outlet
structure, that should not be marked as "structural retrofit, modify outlet structure."
Instead, generally describe the issue in the notes section. The reason for the retrofit
selections should be briefly described in the notes section.
Structural Retrofit
Structural retrofits will incorporate some manner of redesign. These may be simple
changes such as control structure modification or lowering the water level to gain more
storage during storm events. This also includes the redesign of the entire SCM such as
changing a dry pond to a constructed wetland or wet pond. A maximum of two of the
previously described options for structural retrofits may be entered for each SCM.
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Volume Retrofits
Volume retrofits involve increasing the storage area within the existing SCM so that it
can treat a larger design storm by storing a larger volume of water. This may be from
dredging the SCM to provide additional volume, enlarging the pond volume by raising
the embankment, enlarging the pond volume by increasing the footprint, or
moving/rebuilding the dam downstream. Two of the previously described options for
volume retrofits may be entered for each SCM.
Add -on Retrofits
Add -on retrofits involve adding components to the existing SCM to improve water quality
treatment capability. This may include pre-treatment, targeting of nutrient removal, or
stabilization. Choices are: build sediment forebay, add internal berm or baffle, add
floating wetland islands (only if minimum pond depth is 3' or deeper), build littoral shelf
(only if pond volume can still be adequate once the shelf is constructed), and add level
spreader -filter strip per NCDEQs minimum design criteria (MDC). Although adding
berms and baffles could be deployed in almost any wet pond, they should only be
proposed if the objective is to prevent short circuiting. A level spreader with filter strip per
the MDC is only relevant for SCMs that appear to be designed to a previous standard
and would require the level spreader and filter strip to meet current standards. Two of
the previously described options for add -on retrofits can be entered for each existing
SCM. Other opportunities, such as downspout disconnection, should be added under the
"Retrofit Notes."
2.2.9 Contributing Drainage Area Addition
For certain existing SCMs there may be potential to create a treatment train (series of
SCMs) that will better serve the contributing drainage area. These are smaller scale,
parcel level SCMs that could be implemented in the contributing drainage area.
Individually they are not large enough to be considered new SCMs. An example is a
drainage area that has many trees in a configuration that would support the installation
of tree box filters (Filterras). This may include adding one of the following to treat the
water entering the existing SCM or the effluent from the SCM: filter strip, treatment swale
(wet or dry), rainwater harvesting system, removal of impervious surface, proprietary
devices (such as Filterra or Silva cells, specify in the notes section), permeable
pavement, green stormwater infrastructure (such as downspout disconnection, rain
gardens, or residential cisterns if multiple could be deployed, specify in the notes
section), and riparian buffer restoration, or other. Filterras should only be proposed if
multiple installations could be completed on the site. Three options for the contributing
drainage area addition can be entered for each SCM. Describe the reasoning behind the
contributing drainage area additions in the notes section.
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2.2.10 Site Recommendation
Three options are provided for recommending the site. Most sites would fall under "yes"
it is recommended or "no" it is not recommended. In a few situations, a group of SCMs
may be recommended together (Yes, as a group), but this option is not for sites that
would also be recommended individually; but for sites that are ONLY recommended as
part of a group. For example, multiple dry ponds in a neighborhood that could be
retrofitted to wet ponds or constructed wetlands, but individually would not provide
enough treatment to be recommended as standalone retrofits.
2.2.11 Standard Photographs
There are seven standard photographs taken at each existing SCM. Pictures will be
taken using the tablet in the same order each time.
#1: Inlet conditions
#2: View of SCM looking from inlet towards the outlet (capture as much of the SCM in
the photo as feasible)
#3: View of SCM from control structure (capture as much of the SCM in the photo as
feasible)
#4: View of control structure
#5: Inside of control structure
#6: General view downstream of SCM
#7: Conditions at discharge location
Additional photographs can be taken for items of note including issues with the
dam/berm, erosion on pond side slopes, issues with the other structures, etc. A photo
log should be maintained by each field crew.
2.3 Data Management
Data collected will be uploaded and stored on the Kimley-Horn's ArcGIS Online account at the
end of each field day at a minimum so that the geodatabase is continually updated. The server
will be backed up each night. The City will have access to Kimley-Horn's ArcGIS Online account
and will be able to view all uploaded data.
A QA/QC of the data will be performed twice during the SCM assessment, once after the first
two days of assessment and again at the end of the first week of SCM assessment. When the
inventory is complete, a QA/QC will be performed by senior staff.
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3.0 Assessment of Potential New SCMs
The assessment of potential new SCMs will involve evaluation of sites identified during the GIS
pre-screening process. Evaluation will consist of characterization of the proposed site and
selecting a recommendation for SCM type.
3.1 Fieldwork Preparation
A tablet with Collector for ArcGIS installed will be provided to each field team for the potential
new SCM sites to be evaluated. The tablet will contain the GIS layers deemed necessary (such
as utility pipes, property lines, and FEMA floodplains) to navigate to and complete the field
tasks. The tablet will be used to fill out the field forms for each SCM, record the potential new
SCM site GPS location, and take the required photos. The camera within the tablet will be used
for all photo documentation, unless technical issues require the use of a backup camera. An
additional camera will be carried to provide photos for social media and other outreach. A photo
log will be completed for that camera to describe the location and general description of the
photos. Items listed in Section 2.1 should be necessary for each day of field work.
3.2 Field Data Collection
There will be two field teams visiting sites in the watershed on each field day as described in
Section 2.2.
3.2.1 Background Information
The field crew will choose the New SCM form from the Collector for ArcG IS. Information on the
SCM site and field crew doing the evaluation will be entered first into the data form. This
includes the SCM site identification code, subwatershed code, date, and characterization of
surrounding land use as Low Density Residential, High Density Residential, Parks and Open
Space, Commercial, Industrial, Institutional, or Other. Next, the type of SCM must be entered.
Options cover all those identified in the GIS prescreening: Wet Pond, Dry Pond, Constructed
Wetland, Pocket Wetland, Bioretention, Sand filter, Treatment Swale (Wet or Dry), Regenerative
Stormwater Conveyance, and Other. The HSG soil group for the site will also be entered from
the field map. Also, for vertical measurements, if a datum other that the bottom of the SCM is
used, provide that information in the notes.
3.2.2 Characteristics of the Site
The first category in the data form under the new SCMs is the suitability of this site. All sites will
have been pre-screened in a GIS evaluation to ensure it meets certain criteria; however, the
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field evaluation must confirm the viability. A site may be deemed unsuitable if there are utilities
on site that would have to be moved to install an SCM, making it financially impractical. It may
also have other site constraints such as buffer encroachments, incompatible uses, or potential
wetlands which should are also to be recorded. Other constraints may also include inadequate
space for the SCM that may not be identified during the desktop screening. The type of existing
land cover should be recorded in the notes field. If a site is deemed unsuitable by the field
evaluators, an explanation is also to be provided in the notes field. Also, see Sections 2.2.5
Access Limitations and 2.2.6 Site Constraints for additional information.
3.2.3 Potential New SCM Type
The field crew evaluator is able to make two recommendations for each potential new SCM
type. The list of possibilities include a wet pond, dry pond, constructed wetland, pocket wetland,
bioretention, sand filter, treatment swale (wet or dry), regenerative stormwater conveyance, or
other. If "other" is selected, write option in the notes section. Options for other could include
proprietary devices (Filterra, Silva cells), permeable pavement, or level spreader -filter strip.
Recommendations will be from the professional opinions of field staff, and may be influenced by
available space, surrounding land use, proximity to receiving waters, and accessibility.
Once recommendations are made, the length and width of space available for the SCM should
be measured and recorded. A rough sketch of the potential SCM should be drawn in the
Collector for ArcGIS application. The sketch should include the SCM site identification code,
layout of the SCM, surrounding physical site features (e.g., roads, homes, buildings, etc.), inlet
and outlet locations, receiving water, potential constraints, and access route. The completed
sketch should be linked to the evaluated potential project site.
3.2.4 Contributing Drainage Area Addition
For certain existing SCMs there may be potential to create a treatment train (series of SCMs)
that will better serve the contributing drainage area. These are smaller scale, parcel level SCMs
that could be implemented in the contributing drainage area. Individually they are not large
enough to be considered new SCMs. An example is a drainage area that has many trees in a
configuration that would support the installation of tree box filters. This may include adding one
of the following to treat the water entering the existing SCM or the effluent from the SCM: filter
strip, treatment swale (wet or dry), rainwater harvesting system, removal of impervious surface,
proprietary devices (such as Filterra or Silva cells, specify in the notes section), permeable
pavement, green stormwater infrastructure (such as downspout disconnection, rain gardens, or
residential cisterns if multiple could be deployed, specify in the notes section), and riparian
buffer restoration, or other. Filterras should only be proposed if multiple installations could be
completed on the site. Three options for the contributing drainage area addition can be entered
for each SCM. Describe the reasoning behind the contributing drainage area additions in the
notes section.
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3.2.5 Characterization of Receiving Water
This section is for characterizing the waterway or water body receiving discharge from the SCM.
Choices include a perennial/intermittent stream, pipe, ditch, and "other." The field team will use
its best judgment to determine if it is perennial or intermittent. An example of "other" would be a
situation where the outlet connected directly to a storm drain system.
3.2.6 Standard Photographs
There are four standard photographs to be taken by field evaluators at each Potential New SCM
site. Photographs should be taken in the same order each time. Additional photos can
incorporate any other important site features and should be noted in a photo log.
#1: Conditions at potential inlet location
#2: Overall site conditions from inlet location
#3: Overall site conditions from outlet location
#4: Conditions at potential discharge location
#5: Completed SCM sketch
3.3 Data Management
Data collected will be uploaded and stored on the Kimley-Horn's ArcGIS Online account at the
end of each field day at a minimum so that the geodatabase is continually updated. The server
will be backed up each night. The City will have access to Kimley-Horn's ArcGIS Online account
and will be able to view all uploaded data. A QA/QC of the data will be performed twice during
the SCM assessment, once after the first two days of assessment and again at the end of the
first week of SCM assessment. When the inventory is complete, a QA/QC by senior staff will be
performed.
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Appendix A:
Watershed Map

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Appendix B:
SCM Measurement Guidelines

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Adapted from the Field Plan of the DATE
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Improvement Plan DRAWN BY
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Field Measurement Guidelines

Appendix C:
Existing SCM Field Datasheet

New Hope Creek & Little Creek SCM Assessment
SCM Existing
SCM Site ID
Date:
Field Team:
Subwatershed:
Surrounding Land use (Circle one):
Low Density Residential High Density Residential Institutional
Industrial Commercial Parks & Open Space Other
Site Info Notes (Include HSG group from map):
Existing SCM Type (Circle One):
Wet Pond Dry Pond Constructed Wetland Pocket Wetland
Sand Filter Level Spreader Bioretention
Bioretention w/o IWS Erosion Control Device
Existing Water Retention Feature (i.e. farm pond) Other
SCM Length (ft):
SCM Width (ft):
Number of Inlets to SCM:
Inlet Pipe 1 (Circle One): Yes No
Inlet Pipe 1 Diameter (in):
Inlet Pipe 2 (Circle One): Yes No
Inlet Pipe 2 Diameter (in):
v
Inlet Channel 1 (Circle One): Yes No
Inlet Channel 1 Cross -Sectional Area (ft):
Inlet Channel 2 (Circle One): Yes No
Inlet Channel 2 Cross -Sectional Area (ft2):
Presence of Forebay (Circle One): Yes No
Presence of Riser Structure (Circle One):
Yes No
Top of Riser Dimensions (ft):
Diameter Width Length
Presence of Orifice on Riser (Circle One):
Yes No
U
U
2
Stage of Orifice on Riser (ft):
Y
v
Dimensions of Orifice on Riser (in):
Diameter Width Height
Presence of Second Orifice on Riser (Circle One):
Yes No
Stage of Second Orifice on Riser (ft):
Second Orifice Dimensions on Riser (in):
Diameter Width Height
v Primary Outlet Type (Circle One): V-Notched Weir Weir Orifice Underdrain Inaccessible
Y
O Primary Outlet Length of Weir (ft):
Primary Outlet Dimensions of Orifice (in): Diameter Width Height
a Primary Outlet Stage (ft):

New Hope Creek & Little Creek SCM Assessment
SCM Existing
Presence of Emergency Spillway (Circle One):
Yes No
n
Emergency Spillway (ft):
Stage Length
oPresence
of Outfall Pipe (Circle One):
Yes No
Size of Outfall Pipe (in):
Y
0
Material of Outlet Pipe (Circle One):
RCP CMP BCMP Inaccessible Other
Presence of Level Spreader (Circle One):
Yes No
Site Access Quality (Circle One): Accessible by foot Accessible by Vehicle
Site Constraint #1 (Circle One): Wetlands Buffer Encroachment Utility - Water Line
Utility - Sanitary Sewer Line Utility - Gas Line
Utility - Power Line Utility - Telecom Incompatible Use
Accessibility Inadequate Area Houses/Structures
Driveway/Road/Parking Lot Steep Slope/Topography Other
Site Constraint #2 (Circle One): Wetlands Buffer Encroachment Utility - Water Line
Utility - Sanitary Sewer Line Utility - Gas Line
Utility - Power Line Utility - Telecom Incompatible Use
Accessibility Inadequate Area Houses/Structures
Driveway/Road/Parking Lot Steep Slope/Topography Other
Type of Receiving Water (Circle One): Perennial/ Intermittent Stream Ditch Pipe Other
�Headcut at the outfall (Circle One): Yes No
Is the SCM functionine orooerly? Yes No
SCM Notes:
SCM Structural Retrofits Recommendation #1
None Simple Control Structure Modification
o2
(Circle One):
Lower Water Level to Gain Storage Redesign Control Structure
Redesign to Wet Pond Redesign to Constructed Wetland
v
Redesign to Pocket Wetland
76
Y
SCM Structural Retrofits Recommendation #2
None Simple Control Structure Modification
L(Circle
One):
Lower Water Level to Gain Storage Redesign Control Structure
U;
Redesign to Wet Pond Redesign to Constructed Wetland
Redesign to Pocket Wetland
Volume Retrofit Recommendation #1 (Circle
None Dredge Wet Pond Excavate Dry Pond
One)
Enlarge Pond -Raise Height of Embankment
oEnlarge
Pond -Increase Footprint
05
Move/Rebuild Dam Downstream
v
E
Volume Retrofit Recommendation #2 (Circle
None Dredge Wet Pond Excavate Dry Pond
o
One)
Enlarge Pond -Raise Height of Embankment
Enlarge Pond -Increase Footprint
Move/Rebuild Dam Downstream

New Hope Creek & Little Creek SCM Assessment
SCM Existing
Add -on Retrofit Recommendation #1 (Circle None Build Sediment Forebay Add Internal Berms or Baffle Add
o One) Floating Wetland Islands Build Littoral Shelf
0) Add Level Spreader -Filter Strip per MDC
c
O Add -on Retrofit Recommendation #2 (Circle None Build Sediment Forebay Add Internal Berms or Baffle Add
00 One) Floating Wetland Islands Build Littoral Shelf
Q Add Level Spreader -Filter Strip per MDC
c
Contributing Drainage Area Addition #1 Proprietary Filter Strip Treatment Swale - Wet
0
+�
Treatment Swale - Dry Rainwater Harvesting System
QRemoval
of Impervious Surface Riparian Buffer Restoration
Permeable Pavement Green Stormwater Infrastructure Other
v
Q
Contributing Drainage Area Addition #2 Proprietary Filter Strip Treatment Swale - Wet
v
Treatment Swale - Dry Rainwater Harvesting System
c
Removal of Impervious Surface Riparian Buffer Restoration
o
Permeable Pavement Green Stormwater Infrastructure Other
ao
c
Contributing Drainage Area Addition #3 Proprietary Filter Strip Treatment Swale - Wet
Treatment Swale - Dry Rainwater Harvesting System
oRemoval
of Impervious Surface Riparian Buffer Restoration
u
Permeable Pavement Green Stormwater Infrastructure Other
Is the Site Recommended? Yes Yes, as a group No
Retrofit Notes

Appendix D:
New SCM Field Datasheet

New Hope Creek & Little Creek SCM Assessment
SCM New
SCM Site ID:
Date:
Field Team:
Subwatershed
Low Density Residential High Density Residential Institutional
Surrounding Land use (Circle one):
Industrial Commercial Parks & Open Space Other
Site Info Notes (Include HSG group from
map):
Site Suitability (Circle one):
Suitable Unsuitable
Wet Pond Dry Pond Constructed Wetland Pocket Wetland Bioretention
Sand Filter Treatment Swale -Wet
Potential New SCM Type #1 (Circle One):
Treatment Swale - Dry Regenerative Stormwater Conveyance Other
Wet Pond Dry Pond Constructed Wetland Pocket Wetland Bioretention
Sand Filter Treatment Swale -Wet
Potential New SCM Type #2 (Circle One):
Treatment Swale - Dry Regenerative Stormwater Conveyance Other
Contributing Drainage Area Addition #1 (Circle
Proprietary Filter Strip Treatment Swale - Wet
One)
Treatment Swale - Dry Rainwater Harvesting System
Removal of Impervious Surface Riparian Buffer Restoration Permeable
Pavement Green Stormwater Infrastructure Other
Contributing Drainage Area Addition #2 (Circle
Proprietary Filter Strip Treatment Swale - Wet
One)
Treatment Swale - Dry Rainwater Harvesting System
Removal of Impervious Surface Riparian Buffer Restoration Permeable
Pavement Green Stormwater Infrastructure Other
Length of Available Area (ft):
Width of Available Area (ft):
Site Access (Circle One): Accessible by Foot Accessible by Vehicle
Site Constraint #1 (Circle all that apply): Wetlands Buffer Encroachment Utility - Water Line
Utility - Sanitary Sewer Line Utility - Gas Line
Utility - Power Line Utility - Telecom Incompatible Use Accessibility
Inadequate Area Houses/Structures Driveway/Road/Parking Lot Steep
Slope/Topography Other
Site Constraint #2 (Circle all that apply): Wetlands Buffer Encroachment Utility - Water Line
Utility - Sanitary Sewer Line Utility - Gas Line
Utility - Power Line Utility - Telecom Incompatible Use Accessibility
Inadequate Area Houses/Structures Driveway/Road/Parking Lot Steep
Slope/Topography Other
Land Cover in SCM footprint (Circle One): Roof Roadway Parking/Driveway/Sidewalk Protected Forest
Other Pervious/Landscaping
Type of Receiving Water (Circle One): Perennial/ Intermittent Stream Ditch Pipe Other
Is the Site Recommended? Yes Yes, as a group No
Notes: (Also, create and photograph sketch)