19960995 Ver 1_COMPLETE FILE_19961015

State of North Carolina IT
Department of Environment,
Health and Natural Resources AT4 • •
Division of Water Quality
James B. Hunt,Jr., Governor
Jonathan B. Howes,Secretary C) GH F1
A . Preston Howard, Jr., P.E., D i re c to r
October 21, 1996
Halifax County
DWQ Project # 960995
APPROVAL of 401 Water Quality Certification and ADDITIONAL CONDITIONS
Ms. Jane Burke
Roanoke Rapids Graded School District
536 Hamilton Street
Roanoke Rapids, NC 27870
Dear Ms. Burke:
You have our approval to place fill material in 0.60 acres of wetlands or waters for the purpose of
constructing a school at Roanoke Rapids Elementary School, as you described in your application dated 1
October 1996. After reviewing your application, we have decided that this fill is covered by General Water
Quality Certification Number 2671. This certification allows you to use Nationwide Permit Number 26
when it is issued by the Corps of Engineers.
This approval is only valid for the purpose and design that you described in your application except as
modified below. If you change your project, you must notify us and you may be required to send us a new
application. For this approval to be valid, you must follow the conditions listed in the attached certification
and any additional conditions listed below. The detention pond shall be constructed as described in your 1
October 1996 application. In addition, you should get any other federal, state or local permits before you go
ahead with your project including (but not limited to) Sediment and Erosion Control, Coastal Stormwater,
Non-Discharge and Water Supply Watershed regulations.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing.
You must act within 60 days of the date that you receive this letter. To ask for a hearing, send a written
petition which conforms to Chapter 150B of the North Carolina General Statutes to the Office of
Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 276 1 1-7447. This certification and its conditions
are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water
Act. If you have any questions, please telephone John Dorney at 919-733-1786.
Sincerely,
Pest Howard, r. P.E.
Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Raleigh Field Office
Raleigh DWQ Regional Office
Mr. John Dorney
Central Files
960995.1tr
Division of Water Quality • Environmental Sciences Branch
Environmental Sciences Branch, 4401 Reedy Creek Rd., Raleigh, NC 27607 Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer • 50% recycled/10% post consumer paper
G 601996
Soil & Environmental Consultants, Inc.
211 Wcst Millbrook Road ¦ Raleigh, North C;rrolina 27609 ¦ [phone]M Fax [phone]
October 1, 19*7
/ss?
]`,TCDEH & NR - DEM US Army Corps of Engineers - Regulatory
Water Quality Planning Attn: M I-. John Thomas
Attn: Mr. John Dorney 6508 Falls of the Neuse Road
L1401 Reedy Creek Road Suite 120
-t_fleigh, NC 27607 Raleigh, NC 27615 p,Ft:,!VED
T 1 ? 1996
Dear Messrs. Dorney and Thomas:
V:ie purpose of this letter is to request d Nationwide Permit 26 and 40"1 Water
??uality Certification for the project to be known as the new Roanoke Rapids
F.Ionientary School. The project is located south of Bolling Road (SR 1426), east
;f Robinson Drive and north of West 10th Street in Halifax County, as shown on
enclosed plans and vicinity map.
'Pill-in Waters of the U.S. will be required to develop the site for an elementary
school, including parking and athletic fields. It will be necessary to fill 0.60 acres
., Jurisdictional Waters of the U.S. above Ilea dwate?s for placement of the
prc,posed facilities. Due to the marginal quality of these areas, the proposed
.,)Ipacls do not seem significant All impacts are to jurisdictional areas within an
.01ated upland depression.
t'I,,ase call if you have questions or require further information. Wetland
c :,lineation was performed by S&EC; rop:es of data sheets are enclosed. We
ortinally met John Thomas of the tJSACOF on-site on 3/14/96 to verify our
c0-lineation. The attached map indicates wetlands located by GP,,-',. We have
hr?n unable to obtain survey of our fla};gin,;.
11 You intend to perform a site visit, please call and we can arrange for someone
I, ,iccompanv you.

i<eN in C. Martin
KCM/mag
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DEM ID:
Corps Action ID:
Nationwide Permit Requested (Provide Nationwide Permit ft 26
Pre-Construction Notification Application
For Nationwide Permits that Require:
1) Notification to the Corps of Engineers
2) Application for Section 401 Certification
3) Coordination with the NC Division of Coastal Management
(? t^r'r t wr-n
Co r 1 ; 1996
FNVIRONMFNTAL SCI NCFS
Send the original and (1) copy of this completed form to the appropriate field office of
the Corps of Engineers (see agency addresses sheet). Seven (7) copies should be sent to
the NC Division of Environmental Management (see agency addresses sheet). PLEASE
PRINT.
1. Owner's Name: Roanoke Rapids Graded School District
2. Mailing Address: 536 Hamilton Street
Attn: Ms. Jane B. Burke Subdivision Name:
City: Roanoke Rapids State: NC Zip Code: 27870
Project location address, including subdivision name (if different from mailing address
above):
3) Telephone Number (Home):
(Work): [phone]
4) If applicable, agent's name or responsible corporate official, address, phone
number:
Soil & Environmental Consultants, Inc. Phone: [phone]
244 W. Millbrook Road
Raleigh, NC 27609
5. Location of work (provide a map, preferable a copy of USGS topographic map or
aerial photograph with scale):
County: Halifax
Nearest town or city: Roanoke Rapids
Specific Location (include road numbers, landmarks, etc.):
Between Rolling Road (SR 1426) and W. Tenth Street (SR 1400)
6. Impacted or nearest stream/river: Chockoyotte Creek
River Basin: Roanoke
7a. Is project located near water classified as trout, tidal saltwater (SA), high quality
waters (HQW), outstanding resource waters (ORW), water supply (WS-I or WS-
In? YES (? ) NO (®) If yes, explain:
7b. If the project is located within a North Carolina division of coastal management
area of environmental concern (AEC)? YES (?) NO (Z)
7c. If the project is located within a coastal county (see page 7 for list of coastal
counties), what is the land use plan (LUP) designation?
8a. Have any Section 404 permits been previously requested for use on this property?
YES (? ) NO ( ® ) If yes, provide Action ID number of pervious permit
and any additional information (including photocopy of 401 certification).
8b. Are additional permit requests expected for this property in the future?
YES ( ? ) NO ( ® ) If yes, describe anticipated work:
9a. Estimated total number of acres in tract of land: + 20 acres
9b. Estimated total number or acres of wetlands located on project site:
0.60 acres
10a. Number of acres of wetlands impacted by the proposed project by:
Filling: 0.60 Excavation:
Flooding: Other:
Drainage: Total acres to be impacted: 0.60
10b. (1) Stream channel to be impacted by the proposed project (if relocated,
provide distance both before and after relocation): N/A
Length before:
After:
Width Before (based on normal high water contours):
Width After:
Average depth before:
After:
(2) Stream channel impacts will result from: (check all that apply)
Open channel relocation: ? Placement of pipe in channel: ?
Channel Excavation: ? Construction of a Dam/Flooding: ?
Other:
11. If construction of a pond is proposed, what is the size of the watershed draining to
the pond? NA
What is the expected pond surface area?
12. Description of proposed work including discussion of type of mechanical
equipment to be used (attach plans 81/2" x 11" drawings only):
Construction of an elementary school
13. Purpose of proposed work: To allow construction of an elementary
school including parking, buildings and athletic fields
14. State reasons why it is believed that this activity must be carried out in wetlands
(include any measures taken to minimize wetland impacts): See attached
letter from S&EC
15. You are required to contact the U.S. Fish and Wildlife Service (USFWS) and/or
National Marine Fisheries Service (NMFS) (see agency addresses sheet) regarding
the presence of any federally listed or proposed for listing endangered or
threatened species or critical habitat in the permit area that may be affected by the
proposed project. Date contacted: (attach responses from these agencies).
NA <1 acre NW 26
16. You are required to contact the state historic preservation officer (SHPO) (see
agency address sheet) regarding the presence of historic properties in the permit
area which may be affected by the proposed project. Date contacted:
NA < 1 acre NW 26
17. Does the project involve an expenditure of public funds or the use of public (state)
land?
YES (®) NO (?) If no, go to 18.
a. If yes, does the project require preparation of an environmental document
pursuant to the requirements of the North Carolina Environmental Policy
Act?
YES ( ? ) NO ( ® )
b. If yes, has the document been reviewed through the North Carolina
Department of Administration Stat Clearinghouse?
YES ([-]) NO (F-1)
If answers to 17b is YES, then submit appropriate documentation from the state
clearinghouse to division of environmental management regarding compliance
with the North Carolina Environmental Policy Act.
Questions regarding the State Clearinghouse review process should be directed to
Ms. Chrys Baggett, Director State Clearinghouse, North Carolina Department of
Administration, 116 West Jones Street, Raleigh, North Carolina 27603-8003,
telephone [phone].
18. The following items should be included with this application if proposed activity
involves the discharge of excavated or fill material into wetlands:
a. Wetland delineation map showing all wetlands, streams, lakes and ponds on
the property (for Nationwide Permit numbers 14, 18, 21, 26, 29 and 38). All
streams (intermittent and permanent) on the property must be shown on the
map. Map scales should be 1 inch equals 50 feet or 1 inch equals 100 feet or
their equivalent
b. If available, representative photograph of wetlands to be impacted by project.
C. If delineation was performed by a consultant, include all data sheets relevant
to the placement of the delineation line.
d. Attach a copy of the stormwater management plan, if required.
e. What is land used of surrounding property? Residential/ Urban
If applicable, what is proposed method of sewage disposal?
Municipal
g. Signed and dated agent authorization letter, if applicable.
NOTE: Wetlands or Waters of the U.S. may not be impacted prior to:
1. Issuance of a Section 404 Corps of Engineers Permit,
2. Either the issuance or waiver of a 401 Division of Environmental
Management (Water Quality) certification, and
3. (in the twenty coastal counties only) A letter from the North Carolina
Division of Coastal Management stating the proposed activity is consistent
with the North Carolina Coastal Management program.
Owner' /Agent's ignature
\?dd? ?-
Date
(Agent's signature valid only if
Agent Authorization Letter from
the owner is provided (18 g.))
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Precision Mapping, Copyright 1985,96, Just Softworks Inc., Portions Copyright 1992-1996 TRIUS,Inc
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rmed by: Soil and Environmental Consultants, Inc.
244 W. Millbrook Road
Raleigh, NC 27609
Ph 919/8465900 E ?\d
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: k?? ro1? e ",)A-c, t?\A,A Date: 1 ctApplicant/Owner. County. ?o\' oy'
Investigator. e r /A a ct k r State: lu C-
Do Normal Circumstances exist on the site? Yes No Community ID:
Is the site significantly disturbed
(Atypical Situation)? Yes To Transect ID:
Is the area a potential Problem Area? Yes & Plot ID:
(If needed, explain on reverse.) v ' .
VEGETATION
Dominant Plant S ties Stratum Indicator Dominant Plant S ecies Stratum Indicator
1 A-bT Jzse- e- c. 9.
2 ec L,. (- a- `t-ye c C- 10.
3. GCC kS o\t\c,\los e e o -VJ - 11.
4. 12
5. 13.
6. 14.
7. 15.
8. 16.
Percent of Dominant Species that are OBL, FACW or FAC
(excluding FAC-).
0
Remarks:
HYDROLOGY
e )U1 IAY--
Recorded Data (Describe in Remarks):
Stream, Lake, or Tide Gauge
Aerial Photographs
Other
No Recorded Data Available
Field Observations:
o?
Depth ho Surface Water.
Depth to Free Water in Pit _(in.)
Depth to Saturated Soil: (in-)
«c /M e
Wetland Hydrology Indicators:
Primary Indicators:
J
Secondary Indicators (2 or more required):
Oxidized Root Channels in
upper 12 inches
?_Water•Stained Leaves
Local Soil Survey Data
_FAC-Neutral Test
Saturated in Upper 12 inches
Water Marks
Drift Lines
Sediment Deposits
Drainage Patterns in Wetlands
Other (Explain in Remarks)
Remarks:

SOILS
Map- Name
(Series and Phase): Drainage Class:
Field Observations
Taxonomy(Subgroup): d e ck V- \A \ Confirm Mapped Type? Ues No
Profile Description
Depth Matrix Color Mottle Colors Mottle Texture, Concretions,
LZ Horizon Munsell Moist Munsell Moist Abundance Contrast Structure etc.
C3- U!- \fix
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Conbent in Surface Layer in Sandy Soil
Sulfidic Odor TOrganic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
AA -A/iP'
Wetland Determination
Hydrophytic Vegetation Present? No (Circle) Is this Sampling Point Within a Wetland?
Wetland Hydrology Present? No ircle)
Hydric Soils Present? No Yes No
Remarks:
U V- e'-r-c-? 'M e,
Delineation Performed by: Soil and Environmental Consultants, Inc.
244 W. Millbrook Road
Raleigh, NC 27609
Ph 919/846-5900
a?
1
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 CO E
W ^Qiqt' lan D eationManual)
Project/Site: e ? ? C'1": ADate: 3 ? ? l C7
Applicant/Owner. County; ?a\? a
Investigator. \ 'j• r r k r- State: fi
Do Normal Circumstances exist on the site? Ye No Community ID:
Is the site significantly disturbed
(Atypical Situation)? Yes ransect ID:
Is the area a potential Problem Area? Yes o Plot ID:
(If needed, explain on reverse.)
VEGETATION
Dominant Plant S ecies
2 e c .,? t v- w.
3. ?x S
4.
5.
6.
7.
8.
Stratum Indicator
-#-c e- c<<-
y.?vL.
Dominant Plant S ecies
9.
10.
11.
12.
13.
14.
15.
16.
Stratum Indicator
Percent of Dominant Species that are OBL, FACW or FAC
(excluding FAC-). `o ?) C) fo
Remarks:
HYDROLOGY
Recorded Data (Describe in Remarks):
Stream, Lake, or Tide Gauge
Aerial Photographs
Other
No Recorded Data Available
Field Observations:
o?
Depth to Surface Water. (in.)
Depth to Free Water in Pit 7 ')- (in.)
Depth to Saturated SoiL- ?- (in.)
Wetland Hydrology Indicators:
Primary Indicators:
Inundated
Saturated in Upper 12 inches
Water Marks
Drift Lines
Sediment Deposits
Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Oxidized Root Channels in
upper 12 inches
Water-Stained Leaves
Local Soil Survey Data
FAC-Neutral Test
Other (Explain in Remarks)
??? y yr ASS ??y
Remarks:

SOILS
Map Unit-Name
l,
(Series and Phase): &C 32' `tom Drainage Class:
l i Field Observations
Taxonomy(Subgroup): %AJV-\ T Confirm Ma"ed Type? QN0
Profile Description:
Depth Matrix Color Mottle Colors
(ins Horizon Munsell Moist
(Mansell Moist)
Mottle
Abundance/Contrast
Texture, Concretions,
Structure etc.
c ?po ?
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soil
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
Wetland Determination
Hydrophytic Vegetation Present? le No (Circle) Is this Sampling Point Within a Wetland?
Wetland Hydrology Present? Yes (Cu.
Hydric Soils Present? Yes o Yes To
Remarks:
\?-_ - vu J(?_ ?__
960998
Soil
244 West
Environmental Consultants, Inc.
ok Road ¦ Raleigh, North Carolina 27609 ¦ [phone] ¦ Fax [phone]
401188
I,??
October 1, 1996
NCDEH & NR - D]
Water Quality Plan
Attn: Mr. John Doi
4:401 Reedy Creek 1
Raleigh, NC 27607
Dear Messrs
tie purpose of this
Quality Certificatio
Elementary School.
of Robinson Drive
the enclosed plans
Fill-in Waters of the
school, including pa
of jurisdictional Wal
proposed facilities.
impacts do not seem
isolated upland dep
and Thomas:
US Army Corps of Engineers - Regulatory
Attn: Mr. John Thomas
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615 RECEIVED
GCT 1 7 1996
ENVIRONMENTAL SCIENCES
?'
Ater is to request a Nationwide Permit 26 and 401 Water
for the project to be known as the new Roanoke Rapids
Che project is located south of Bolling Road (SR 1426), east
d north of West 10th Street in Halifax County, as shown on
Id vicinity map.
J.S. will be required to develop the site for an elementary
king and athletic fields. It will be necessary to fill 0.60 acres
!rs of the U.S. above headwaters for placement of the
)ue to the marginal quality of these areas, the proposed
significant. All impacts are to jurisdictional areas within an
Please call if you have questions or require further information. Wetland
delineation was performed by S&EC; copies of data sheets are enclosed. We
originally met John Thomas of the USACOE on-site on 3/14/96 to verify our
delineation. The attached map indicates wetlands located by GPS. We have
been unable to obtain survey of our flagging.
If you intend to perform a site visit, please call and we can arrange for someone
to accompany you.
Sincerely,
C ?? e e ?/-?
Kevin C. Martin
President
KCM/mag
Soil/Site Evaluation ¦ Mapping and Physical Analysis ¦ Wetlands Mapping and Mitigation ¦ Environmental Audits
On-Site Waste Treatment Systems, Evaluation and Design
DEM ID: Corps Action ID: REC( i'?; r r;
Nationwide Permit Requested (Provide Nationwide Permit ft 26
Pre-Construction Notification Application
For Nationwide Permits that Require:
1) Notification to the Corps of Engineers
2) Application for Section 401 Certification
3) Coordination with the NC Division of Coastal Management
nT 1 ;' +y96
`N?:RUNMET? )'q? aCl; NCFS
Send the original and (1) copy of this completed form to the appropriate field office of
the Corps of Engineers (see agency addresses sheet). Seven (7) copies should be sent to
the NC Division of Environmental Management (see agency addresses sheet). PLEASE
PRINT.
1. Owner's Name: Roanoke Rapids Graded School District
2. Mailing Address: 536 Hamilton Street
Attn: Ms. Jane B. Burke Subdivision Name:
City: Roanoke Rapids State: NC Zip Code: 27870
Project location address, including subdivision name (if different from mailing address
above):
3) Telephone Number (Home):
(Work): [phone]
4) If applicable, agents name or responsible corporate official, address, phone
number:
Soil & Environmental Consultants, Inc. Phone: [phone]
244 W. Millbrook Road
Raleigh, NC 27609
5. Location of work (provide a map, preferable a copy of USGS topographic map or
aerial photograph with scale):
County: Halifax Nearest town or city: Roanoke Rapids
Specific Location (include road numbers, landmarks, etc.):
Between Rolling Road (SR 1426) and W. Tenth Street (SR 1400)
6. Impacted or nearest stream/river: Chockoyotte Creek
River Basin: Roanoke
7a. Is project located near water classified as trout, tidal saltwater (SA), high quality
waters (HQW), outstanding resource waters (ORW), water supply (WS-I or WS-
In? YES (? ) NO (®) If yes, explain:
7b. If the project is located within a North Carolina division of coastal management
area of environmental concern (AEC)? YES (?) NO (Z)
7c. If the project is located within a coastal county (see page 7 for list of coastal
counties), what is the land use plan (LUP) designation?
8a. Have any Section 404 permits been previously requested for use on this property?
YES ( ? ) NO ( ® ) If yes, provide Action ID number of pervious permit
and any additional information (including photocopy of 401 certification).
8b. Are additional permit requests expected for this property in the future?
YES (? ) NO ( ® ) If yes, describe anticipated work:
9a. Estimated total number of acres in tract of land: + 20 acres
9b. Estimated total number or acres of wetlands located on project site:
0.60 acres
10a. Number of acres of wetlands impacted by the proposed project by:
Filling: 0.60 Excavation:
Flooding: Other:
Drainage: Total acres to be impacted: 0.60
10b. (1) Stream channel to be impacted by the proposed project (if relocated,
provide distance both before and after relocation): N/A
Length before:
After:
Width Before (based on normal high water contours):
Width After:
Average depth before:
After:
(2) Stream channel impacts will result from: (check all that apply)
Open channel relocation: ? Placement of pipe in channel: ?
Channel Excavation: ? Construction of a Dam/Flooding: ?
Other:
11. If construction of a pond is proposed, what is the size of the watershed draining to
the pond? NA
What is the expected pond surface area?
12. Description of proposed work including discussion of type of mechanical
equipment to be used (attach plans 81/2" x 11" drawings only):
Construction of an elementary school
13. Purpose of proposed work: To allow construction of an elementary
school including parking, buildings and athletic fields
14. State reasons why it is believed that this activity must be carried out in wetlands
(include any measures taken to minimize wetland impacts): See attached
letter from S&EC
15. You are required to contact the U.S. Fish and Wildlife Service (USFWS) and/or
National Marine Fisheries Service (NMFS) (see agency addresses sheet) regarding
the presence of any federally listed or proposed for listing endangered or
threatened species or critical habitat in the permit area that may be affected by the
proposed project. Date contacted: (attach responses from these agencies).
NA <1 acre NW 26
16. You are required to contact the state historic preservation officer (SHPO) (see
agency address sheet) regarding the presence of historic properties in the permit
area which may be affected by the proposed project. Date contacted:
NA < 1 acre NW 26
17. Does the project involve an expenditure of public funds or the use of public (state)
land?
YES (®) NO (?) If no, go to 18.
a. If yes, does the project require preparation of an environmental document
pursuant to the requirements of the North Carolina Environmental Policy
Act?
YES (?) NO (®)
b. If yes, has the document been reviewed through the North Carolina
Department of Administration Stat Clearinghouse?
YES([:]) NO (?)
If answers to 17b is YES, then submit appropriate documentation from the state
clearinghouse to division of environmental management regarding compliance
with the North Carolina Environmental Policy Act.
Questions regarding the State Clearinghouse review process should be directed to
Ms. Chrys Baggett, Director State Clearinghouse, North Carolina Department of
Administration, 116 West Jones Street, Raleigh, North Carolina 27603-8003,
telephone [phone].
18. The following items should be included with this application if proposed activity
involves the discharge of excavated or fill material into wetlands:
a. Wetland delineation map showing all wetlands, streams, lakes and ponds on
the property (for Nationwide Permit numbers 14, 18, 21, 26, 29 and 38). All
streams (intermittent and permanent) on the property must be shown on the
map. Map scales should be 1 inch equals 50 feet or 1 inch equals 100 feet or
their equivalent.
b. If available, representative photograph of wetlands to be impacted by project.
C. If delineation was performed by a consultant, include all data sheets relevant
to the placement of the delineation line.
d. Attach a copy of the stormwater management plan, if required.
e. What is land used of surrounding property? Residential/ Urban
f. If applicable, what is proposed method of sewage disposal?
Municipal
g. Signed and dated agent authorization letter, if applicable.
NOTE: Wetlands or Waters of the U.S. may not be impacted prior to:
1. Issuance of a Section 404 Corps of Engineers Permit,
2. Either the issuance or waiver of a 401 Division of Environmental
Management (Water Quality) certification, and
3. (in the twenty coastal counties only) A letter from the North Carolina
Division of Coastal Management stating the proposed activity is consistent
with the North Carolina Coastal Management program.
le.
Owner' /Agent's ignature
IOId? b
Date
(Agent's signature valid only if
Agent Authorization Letter from
the owner is provided (18 g.))
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Delineation Performed by: Soil and Environmental Consultants, Inc.
244 W. Millbrook Road
o + Raleigh, NC 27609
N 3? 21 $o S 3 Ph: 919/846-5900
10 ?Id? 3 (c) DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: ?auv,1,kC Lai) ?S C c?AOI Date:_ a 1 h(
Applicant/ Owner. County:
Investigator. A/?a Ctk r State: ?-
Do Normal Circumstances exist on the site? Yes No Community ID:
Is the site significantly disturbed
(Atypical Situation)? Yes To Transect ID:
Is the area a potential Problem Area? Yes Plot ID:
(If needed, explain on reverse.) v .
VEGETATION
Dominant Plant S ecies Stratum
3. Qs.Itc<--5 AVo\los A- y e e-
4.
5.
6.
7.
8.
Indicator
t- L
f C_ Dominant Plant Species
9.
10.
o c.Ui - 11.
12.
13.
14.
15.
16.
Stratum Indicator
Percent of Dominant Species that are OBL, FACW or FAC
(excluding FAC-). 1 ?? l
0
Remarks:
eN,
HYDROLOGY
Recorded Data (Describe in Remarks):
Stream, Lake, or Tide Gauge
Aerial Photographs
Other
No Recorded Data Available
Field Observations:
CS i?
Depth In Surface Water.
Depth to Free Water in Pit (in.)
Depth to Saturated SoiL- (in.)
Wetland Hydrology Indicators:
Primary Indicators:
Saturated in Upper 12 inches
Water Marks
Drift Lines
Sediment Deposits
Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Oxidized Root Channels in
upper 12 inches
Water-Stained Leaves
Local Soil Survey Data
FAC-Neutral Test
Other (Explain in Remarks)
Remarks:
SOILS
Map T-4266-Name (Series and Phase): Drainage Class:
Field Observations
Taxonomy(Subgroup): U e cl V- \k k_?_ Confirm Mapped Type? Ues No
Profile Descriytion:
Depth Matrix Color Mottle Colors Mottle Texture, Concretions,
fins Horizon (Munsell Moist Munsell Moist Abundan a Contrast Structure etc.
O- 1Z ?_ Z 5 ?J ?S -? c C KGs v?
Hydric Soil Indicators:
Histosol Concretions
,Histic Epipedon High Organic Content in Surface Layer in Sandy Soil
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chrome Colors Other (Explain in Remarks)
Remarks:
AA Crl r\G 'Me -1
Wetland Determination
Hydrophytic Vegetation Present? No (Circle) Is this Sampling Point Within a Wetland?
Wetland Hydrology Present? No rrcIe
Hydric Soils Present? es) No (
Remarks:

Delineation Performed by: Soil and Environmental Consultants, Inc.
244 W. Millbrook Road
Raleigh, NC 27609
Ph 919/846-5900 u
DATA FORM
ROUTINE WETLAND DEL MALI TA17ION
(1987 CO E W tlan Delineation. Manual) t C?
Project/Site: \+-? a ?? ? 11.E ? c,'xolDabe: 13 t c \ l C?
Applicant/Owner. County:
Investigator. r State: 'N. L?
Do Normal Circumstances exist on the site? Yes No Community ID:
Is the site significantly disturbed
(Atypical Situation)? Yes ransect ID:
Is the area a potential Problem Area? Yes o Plot ID:
(If needed, explain on reverse.)
VEGETATION
Dominant Plant S ecies
1 ""-- ?e
2 e c "i -
3. ?X
4.
5.
6.
7.
8.
Stratum Indicator
-?-cc? ccG
4? c_
Dominant Plant S ecies
9.
10.
11.
12
13.
14.
15.
16.
Stratum Indicator
Percent of Dominant Species that are OBL, FACW or FAC
(excluding FAC-).
L
Remarks:
HYDROLOGY
Recorded Data (Describe in Remarks):
Stream, Lake, or Tide Gauge
Aerial Photographs
Other
No Recorded Data Available
Field Observations:
Depth to Surface Water. (in.
Depth to Free Water in Pit '7 ':> (in.)
Depth to Saturated SoiL• "-? ?- (in.)
Wetland Hydrology Indicators:
Primary Indicators:
Inundated
Saturated in Upper 12 inches
Water Marks
Drift Lines
Sediment Deposits
Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Oxidized Root Channels in
upper 12 inches
Water-Stained Leaves
Local Soil Survey Data
FAC-Neutral Test
Oth
er (Explain in Remarks)
??o?? U rr`?SS ??y
Remarks:

SOILS
Mdr Uitit-Name
(Series and Phase):?1 Drainage Class:
a . ? Field Observations
TaxonomY(Sub$rouP): W ` ?u Confirm Mapped Type? QNO
Profile Descriytion:
Depth Matrix Color Mottle Colors Mottle
Uns.) Horizon Munsell Moist
U 3
(Mansell Moist) Abundance /Contrast
Hydric Soil Indicators:
Texture, Concretions,
Structure etc. Q
cr- 1t?o
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soil
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
N?4Q?
Wetland Determination
H dro h tic Vegetation Present?
Y P Y e No (Circle) Is this Sampling Point Within a Wetland?
Wetland Hydrology Present? Yes S& (Cir??
Hydric Soils Present? Yes o Yes ' iVo l
Remarks:

ql L_t'),
o a 1006
Soil & Environmental Consultants, Inc.
244 West Millbrook Road ¦ Raleigh, North Carolina 27609 ¦ [phone] ¦ Fax [phone]
October 1, 1996
NCDEH & NR - DEM
Water Quality Planning
Attn: Mr. John Dorney
4401 Reedy Creek Road
Raleigh, NC 27607
Dear Messrs. Dorney and Thomas:
US Army Corps of Engineers - Regulatory
Attn: Mr. John Thomas
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615
The purpose of this letter is to request a Nationwide Permit 26 and 401 Water
Quality Certification for the project to be known as the new Roanoke Rapids
Elementary School. The project is located south of Bolling Road (SR 1426), east
of Robinson Drive and north of West 10th Street in Halifax County, as shown on
the enclosed plans and vicinity map.
Fill-in Waters of the U.S. will be required to develop the site for an elementary
school, including parking and athletic fields. It will be necessary to fill 0.60 acres
of jurisdictional Waters of the U.S. above headwaters for placement of the
proposed facilities. Due to the marginal quality of these areas, the proposed
impacts do not seem significant. All impacts are to jurisdictional areas within an
isolated upland depression.
Please call if you have questions or require further information. Wetland
delineation was performed by S&EC; copies of data sheets are enclosed. We
originally met John Thomas of the USACOE on-site on 3/14/96 to verify our
delineation. The attached map indicates wetlands located by GPS. We have
been unable to obtain survey of our flagging.
If you intend to perform a site visit, please call and we can arrange for someone
to accompany you.
Sincerely,

Kevin C. Martin
President
F11?
vt'
KCM/mag
Soil/Site Evaluation ¦ Mapping -i--1 physical Analysis ¦ Wetlands Mal-ping and Mitigar;- 'q Environmental Audits
On-Site Waste Treatment Systems, Evalua"ion and Design
DEM ID: , _ :., . , r, Corps Action ID:
J 41
Nationwide Permit Requested (Provide Nationwide Permit ft 26
Pre-Construction Notification Application
For Nationwide Permits that Require:
1) Notification to the Corps of Engineers
2) Application for Section 401 Certification
3) Coordination with the NC Division of Coastal Management
Send the original and (1) copy of this completed form to the appropriate field office of
the Corps of Engineers (see agency addresses sheet). Seven (7) copies should be sent to
the NC Division of Environmental Management (see agency addresses sheet). PLEASE
PRINT.
1. Owner's Name: Roanoke Rapids Graded School District
2. Mailing Address: 536 Hamilton Street
Attn: Ms. Jane B. Burke Subdivision Name:
City: Roanoke Rapids State: NC Zip Code: 27870
Project location address, including subdivision name (if different from mailing address
above):
3) Telephone Number (Home):
(Work): [phone]
4) If applicable, agent's name or responsible corporate official, address, phone
number:
Soil & Environmental Consultants, Inc. Phone: [phone]
244 W. Millbrook Road
Raleigh, NC 27609
5. Location of work (provide a map, preferable a copy of USGS topographic map or
aerial photograph with scale):
County: Halifax Nearest town or city: Roanoke Rapids
Specific Location (include road numbers, landmarks, etc.):
Between Rolling Road (SR 1426) and W. Tenth Street (SR 1400)
6. Impacted or nearest stream/river: Chockovotte Creek
River Basin: Roanoke
7a. Is project located near water classified as trout, tidal saltwater (SA), high quality
waters (HQW), outstanding resource waters (ORW), water supply (WS-I or WS-
In? YES ( ? ) NO (® ) If yes, explain:
7b. If the project is located within a North Carolina division of coastal management
area of environmental concern (AEC)? YES (?) NO (Z)
7c. If the project is located within a coastal county (see page 7 for list of coastal
counties), what is the land use plan (LUP) designation?
8a. Have an Section 404 permits been previously requested for use on this property?
YES ( Fj ) NO ( ® ) If yes, provide Action ID number of pervious permit
and any additional information (including photocopy of 401 certification).
8b. Are additional permit requests expected for this property in the future?
YES ( ? ) NO ( ® ) If yes, describe anticipated work:
9a. Estimated total number of acres in tract of land: + 20 acres
9b. Estimated total number or acres of wetlands located on project site:
0.60 acres
13. Purpose of proposed work: To allow construction of an elementary
school including parking buildings and athletic fields
14. State reasons why it is believed that this activity must be carried out in wetlands
(include any measures taken to minimize wetland impacts): See attached
letter from S&EC
15. You are required to contact the U.S. Fish and Wildlife Service (USFWS) and/or
National Marine Fisheries Service (NMFS) (see agency addresses sheet) regarding
the presence of any federally listed or proposed for listing endangered or
threatened species or critical habitat in the permit area that may be affected by the
proposed project. Date contacted: (attach responses from these agencies).
NA <1 acre NW 26
16. You are required to contact the state historic preservation officer (SHPO) (see
agency address sheet) regarding the presence of historic properties in the permit
area which may be affected by the proposed project. Date contacted:
NA < 1 acre NW 26
17. Does the project involve an expenditure of public funds or the use of public (state)
land?
YES (N) NO (?) If no, go to 18.
a. If yes, does the project require preparation of an environmental document
pursuant to the requirements of the North Carolina Environmental Policy
Act?
YES (?) NO (N)
b. If yes, has the document been reviewed through the North Carolina
Department of Administration Stat Clearinghouse?
YES (?) NO (?)
If answers to 17b is YES, then submit appropriate documentation from the state
clearinghouse to division of environmental management regarding compliance
with the North Carolina Environmental Policy Act.
Questions regarding the State Clearinghouse review process should be directed to
Ms. Chrys Baggett, Director State Clearinghouse, North Carolina Department of
Administration, 116 West Jones Street, Raleigh, North Carolina 27603-8003,
telephone [phone].
18. The following items should be included with this application if proposed activity
involves the discharge of excavated or fill material into wetlands:
a. Wetland delineation map showing all wetlands, streams, lakes and ponds on
the property (for Nationwide Permit numbers 14, 18, 21, 26, 29 and 38). All
streams (intermittent and permanent) on the property must be shown on the
map. Map scales should be 1 inch equals 50 feet or 1 inch equals 100 feet or
their equivalent
b. If available, representative photograph of wetlands to be impacted by project.
C. If delineation was performed by a consultant, include all data sheets relevant
to the placement of the delineation line.
d. Attach a copy of the stormwater management plan, if required.
e. What is land used of surrounding property? Residential/ Urban
f. If applicable, what is proposed method of sewage disposal?
Municipal
g. Signed and dated agent authorization letter, if applicable.
NOTE: Wetlands or Waters of the U.S. may not be impacted prior to:
1. Issuance of a Section 404 Corps of Engineers Permit,
2. Either the issuance or waiver of a 401 Division of Environmental
Management (Water Quality) certification, and
3. (in the twenty coastal counties only) A letter from the North Carolina
Division of Coastal Management stating the proposed activity is consistent
with the North Carolina Coastal Management program.
C(,- If ?,- C /
e?
Owner' /Agent's ignature
I d(? L
Date
(Agent's signature valid only if
Agent Authorization Letter from
the owner is provided (18 g.))
rimmon mapping, copynght jb9 ,96, Just Soft orks Inc., Portions Copyright 1992-1988 TRIUS,Inc.
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Delineation Performed by: Soil and Environmental Consultants, Inc.
244 W. Millbrook Road
,. ' k Raleigh, NC 27609
N 3? ' ?? ?i $n S 3 Ph: 919/8465900
DATA FORM
ROUTINE WETLAND DE1 UMUNATION
(1987 COE Wetlands Delineation Manual)
Project/Site: D? ?v rr ^ , A Date: 1
APplicant/Owner. County:---cx\. t 4X
Investigator. e ,J , vN /A/l_d ;-t-% r State: N L
Do Normal Circumstances exist on the site? Y?No Community ID.
Is the site significantly disturbed
(Atypical Situation)? Yes %) Transect ID:
Is the area a potential Problem Area? Yes Co) Plot ID:
(If needed, explain on reverse.)
VEGETATION
Dominant Plant S ecies
1 r,u S a e-c).o_
2 t c- ",A3
3.V ?cc kS n?o\lo?
4.
5.
6.
7.
8.
Stratum Indicator
re_ e- ".C_
ce_ c `

Dominant Plant S ecies
9.
10.
11.
12.
13.
14.
15.
16.
Stratum Indicator
Percent of Dominant Species that are OBL, FACW or FAC
(excluding FAC-). I r,\ ^'? I
Remarks:
HYDROLOGY
e
Recorded Data (Describe in Remarks):
Stream, Lake, or Tide Gauge
Aerial Photographs
Other
No Recorded Data Available
Field Observations:
o7? Z
Depth it Surface Water. " 1 (in.)
Depth to Free Water in Pit (in.)
Depth to Saturated Soil: (in,)
AV-,, C.CAei c'Q '1 e
Wetland Hydrology Indicators:
Primary, Indicators:
Saturated in Upper 12 inches
Water Marks
Drift Lines
Sediment Deposits
Drainage patterns m Wetlands
Secondary Indicators (2 or more required):
Oxidized Root Channels in
upper 12 inches
-L_WaberStained Leaves
Local Soil Survey Data
FAC-Neutral Test
Other (Explain in Remarks)
Remarks: -

SOILS
Map -Name
(Series and Phase): '??o cc Drainage Class: \
Field Observations
Taxonomy(Subgroup): 'A e a V- u ` Confirm Ir4npped Type? Ues No
Profile Description:
Depth Matrix Color Mottle Colors Mottle Texture, Concretions,
fims? Horizon (Munsell Moist) unse Moist Abundance Contrast Structure etc.
o- ?z A_ \r1A iZ l
Hydric Soil Indicators:
Histosol Concretions
,"Histic Epipedon High Organic Content in Surface Layer in Sandy Soil
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
k C_ _('C4,\ Cg_,er?G A111_?
Wetland Determination
Hydrophytic Vegetation Present? No (Circle) Is this Sampling Point Within a Wetland?
Wetland Hydrology Present? No ((ccm)
Hydric Soils Present? es) No es u No
Remarks:
v- C -Ir-C _S _//V? P_

SOILS
Asap-Hre*Name
(Series and Phase):_-O r Drainage Class:
bgroup): Field Observations ?
Taxonomy(Su -
Confirm Mapped Type?,?No
Profile Des-- Rg2V
Depth Matrix Color Mottle Colors Mottle
Texture, Concretions,
HH?on unsell A-* (Munsell Moist) Abundance/Contrast Structure etc.
At C, 4 C' Y-4
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soil
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
4Q? V\ u4Ck c ?.,)

Wetland Determimfion
Hydrophytic Vegetation Present? (jj? No (Circle) Is this Sampling Point Within a Wetland?
Wetland Hydrology Present? Yes & (Cir
Hydric Soils Present? Yes )o Yes ?o:)
Remarks:

Detention Design and Stormwater Credit Summary
NEW ELEMENTARY SCHOOL ROANOKE R APIDS, NC
DETENTION POND #1
HYDROGRAPH PARAMETERS
Item Existing Proposed
Drainage Area
Pervious [acres] 2.80 0.00 Ref: Topgraphic
Impervious [acres] 0.00 3.70 Mapping
Drainage Area [acres] 2.80 3.70
100.0% < %impervious
Rational C
Pervious C 0.35 0.35 Ref: Hydrology an d Water Quantity
Impervious C 0.95 0.95
Composite Rational C 0.35 0.95

Time of Concentration, Tc

Length 439 762
H 18
TC /minJ 2.9 773
--
- Kirpich's Equation
-- -
-
Use 5.0 mi n
Intensities, I _,
2-year [in/hr] 6.05 6.05 Ref: National Climatic
10-year [in/hrl 7.58 7.58 Weather Center, Asheville, NC
25-year [in/hrl 8.60 8.60
Peak Discharge, Qp 1 -- - Q = CIA
2-year [cfsl 5.93 21.27
10-year Icfs1 7.43 26.64
25-year [cfsl 8.43 30.23

Curve Number, CN
Pervious CN 50.0 50.0

Impervious CN 98.0 98.0
Composite CN 50.0 98.0
S 10.0 0.2
Precipitation Amount, P for 5 minute storm
2-year ?[inch esl 2.78 2.78 Ref Nat ional Clim atic
10-year finches 1 3.94 3.94 Weather Center, Asheville, NC
25-year [inches] 4.62 4.62
Page 1
Detention Design and Stormwater Credit Summary
Volume of Runoff, V, from six-hour storm
2-year [inches] 0.06 2.55 v - ((p-.2S)^2)/(p+.8s)
10-year [inches] 0.32 3.71
25-year finches] 0.54 4.38
2 -year [acre-feet] 0.01 0.79
10-year [acre-feet] 0.071 1.14
25-year [acre-feet] 0.13 1.35
Time-to-Peak, Tp ( for use in routing) f
-
-
2 -year - -
[minutes] { 19.3 Tp = V/ (1 .39*Qp)
10-year [minutes] 22.4
25-year [minutes] 23.4
,

Time Interval for R outing
year
2
- [minutes]
ear
1
0- ] 1
25-year [minutes] 1 for peak def inition
25-year [minutes] 60 to ensure basin empties

BASIN PARAMETERS

Riser Barrel Emergency Spillway
24 = Dia. riser (inches) 12 = Dia. barrel (inches) 0
_
_ = Length
__
3.3 = Cw riser 0.55 = Cd barrel 0
0.0 = Cwl
178.0 = Crest elev. riser 178 = Invert elev. barrel 0.0 = Crest elevation
0 = height outlet 1 lin.l i
0 length outlet1 [ft] Basin II
0 - Cd outlet 1 55 1 _ invert barrel
width@
0.0 = Invert outlet 1 110, = length @ invert barrel
l
0 = height outlet 2[in.] 31: 1 = shape factor
0 = length outlet 2 [ftl 178.0! = Initial elev. water level
0 = Cd outlet 2 1 - j -- l
0.0 = Invert outlet 2
Results
Event Pre-Development
Peak Volume
Dischar
e
- g
[cfs] lac-ft]
2 5.93 i 0.013
10 7.43 n/a
25 8.43 n/a
Post Development Post Development
With Controls No controls
Peak Peak Volume Peak Volume
Discharge Elevation Discharge
[cfs] lac-ft] [cfs] [ac-ft]
i
5.31
180.88
0.780
21.3
0.789

6.41
181.93
1 -
26.6
6.97 182.55 11 30.2
Page 2
Detention Design and Stormwater Credit Summary
(OUTIN G AND AN ALYSIS -- 2- year storm 1
O utlet Hy draulics
Time Inflow Storage Stage Outflow Surf. Area Q -barrel O.-ri ser Q Q Q
[min] [cfs] [cubic ft] [ft] [cfs] [sq.ft] weir orifice em.spil outlet1 outlet2
0 0.0 0 178.0 0.0 6050 0.0 0.0 0.0 0 0.0 0.0
1.0 0.1 0 178.0 0.0 6050 0.0 0.0 0.0 0 0.0 0.0
2.0 0.6 8 178.0 0.0 6051 0.0 0.0 0.6 0 0.0 0.0
3.0 1.2 42 178.0 0.0 6057 0.0 0.0 1.3 0 0.0 0.0
4.0 2.2 116 178.0 0.0 6069 0.0 0.1 2.1 0 0.0 0.0
5.0 3.3 243 178.0 0.1 6090 0.1 0.2 3.0 0 0.0 0.0
6.0 4.7 437 178.1 0.2 6121 0.2 0.4 4.1 0 0.0 0.0
7.0 6.2 707 178.1 0.3 6165 0.3 0.8 5.1 0 0.0 0.0
8.0 7.8 1,061 178.2 0.4 6222 0.4 1.5 6.3 0 0.0 0.0
9.0 9.5 1,504 178.2 0.6 6294 0.6 2.5 7.5 0 0.0 0.0-
10.0 11.2 2,039 178.3 0.8 6379 0.8 3.9 8.7 0 0.0 0.0
11.0 12.9 2,665 178.4 1.0 6478 1.0 5.8 9.9 0 0.0 0.0
12.0 14.6 3,379 178.5 1.3 6590 1.3 8.1 111 0 0.0 0.0
13.0 16.1 4,176 178.7 1.6 6714 1.6 11.0 12.2 0 0.0 0.0
14.0 17.5 5,049 178.8 1.9 6848 1.9 14.4 13.4 0 0.0 0.0
15.0 18.8 5,986 178.9 2.3 6991 2.3 18.3 14.5 0 0.0 0.0
16.0 19.8 6,977 179.1 2.6 7141 2.6 22.7 15.6 0 0.0 0.0
17.0 20.5 8,007 179.2 2.9 7295 2.9 27.4 16.6 0 0.0 0.0
18.0 21.0 9,064 179.3 3.2 7451 3.2 32.5 17.6 0 0.0 0.0
19.0 21.3 10,134 179.5 3.4 7608 3.4 37.8 18.5 0 0.0 0.0
20.0 21.2 1 1 , 203 179.6 3.7 7763 3.7 43.3 19.3 0 0.0 0.0
21 .1 .0 20.9 179.8 9 7914 9 '
22.0 20.3 13,27 1
79.9 4 -8
059 4.
1 54.2 20.8
) 0 0.0 0.0
23.0 19.4 14,241 180.0 4.3 8197 4.3 1 59.5 21.5 0 0.0 0.0
24
0 18.3 149
1 15 180.1 4.4 8324 4.41 64.6 22.1 0 0.0 0.0
.
25.0 17.1 ,
15,983 180.2 4.6 8441 4.6 ? 69.2 22.6 l 0 0.0 0-9
26.0 16.0 16,738 180.3 4.7 8546 4.7 73.5 23.1 0 0.0 0.0
27.0 15.0 17,419 180.4 4.8 8640 4.8 77.4 23 5 0 0.0 0.0
28.0 14.0 18,031 180.5 4.9 8724 4.9 80.9 23.8 0 0.0 0.0
29.0 13.1 18,579 180.5 4.9 8799 4.9 84.0 24.1 0 0.0 0.0
30.0 12.2 19,068 180.6 5.0 8866 5.0 86.9 24.4 0 0.0 0.0
31.0 11.4 19,502 180.6 5.1 8925 5.1 89.4 24.6 0 0.0 0.0
32.0 10.7 19,884 180.7 5.1 8977 5.1 91.6 24.8 0 0.0 0.0
33.0 10.0 20,218 180.7 5.2 9023 5.2 93.6 25.0 0 0.0 0.0
34.0 9.4 I 20,508 180.8 5.2 9062 5.2 95.3 25.2 0 0.0 0.0
35.0 8.7 i 20,757 180.8 5.2 9096 5.2 96.8 1 25.3 0
- 0.0 0.0
36.0 1
8.2 -- -
20,967 -
180.8 _
-
j 5.3 9124 5.3 1 98.O a 25.4 0 0.0 0.0
37
0 7.6 21
141 180.8 53 9147 5.3 99.0 1 25.5 0 0.0 0.0
.
38.0 7.1 ,
21,282 180.9 5.3 9166 5.3 1 99.9 25.5 1 0 0.0 0.0
-
39.0 6.7
i 1 .9
1 5.

1

25
.6
j

1
0
1 0.0
1 0.0
1
40.0 6.2 _

{
,474
21,47- -
180.9 --
5.3 - -
9192 -
5.3 -
101.0
' 25
.
6
1 0
1 0.0
0.0
41
0 5
8 21
528 180.9 -
{ 5.3 9200 5.3 1 101.3 25.7 ; 0 0.0 O.C
.
42.0 .
( 5.5 ,
I 21 ,558 1 180.9 1 5.3 9204 5.3 1 101 .5 25.7 j 0 1 0.0 ! O.C
50.0 3.2 21,094 180.8 5.3 9141 5.3 98.8 1 25.5 ! 0 1 0.0 1 0.(
Page 3
Detention Design and Stormwater Credit Summary
60.0 1.6 19,415 180.6 5.1 8914 5.1 88.9 24.6 0 0.0 0.0
70.0 0.8 17,193 180.4 4.7 8609 4.7 76.1 23.3 0 0.0 0.0
80.0 0.4 14,820 180.1 4.4 8278 4.4 62.7 21.9 0 0.0 0.0
90.0 0.2 12,502 179.8 3.9 7950 3.9 50.1 20.3 0 0.0 0.0
100.0 0.1 10,350 179.5 3.5 7640 3.5 38.9 18.7 0 0.0 0.0
110.0 0.1 8,428 179.3 3.0 7357 3.0 29.4 17.0 0 0.0 0.0
120.0 0.0 6,773 179.0 2.5 7110 2.5 21.7 15.4 0 0.0 0.0
130.0 0.0 5,404 178.8 2.0 6903 2.0 15.9 13.8 0 0.0 0.0
140.0 0.0 4,295 178.7 1.6 6732 1.6 11.4 12.4 0 0.0 0.0
150.0 0.0 3,402 178.5 1.3 6594 1.3 8.2 11.1 0 0.0 0.0
160.0 0.0 2,688 178.4 1.1 6482 1.1 5.8 9.9 0 0.0 0.0
170.0 0.0 2,119 178.3 0.8 6392 0.8 4.1 8.8 0 0.0 0.0
180.0 0.0 1,668 178.3 0.7 6320 0.7 2.9 7.9 0 0.0 0.0
190.0 0.0 1,311 178.2 0.5 6263 0.5 2.0 7.0 0 0.0 0.0
200.0 0.0 1,030 178.2 0.4 6217 0.4 1.4 6.2 0 0.0 0.0
210.0 0.0 808 178.1 0.3 6181 0.3 1.0 5.5 0 0.0 0.0
220.0 0.0 633 178.1 0.3 53
61 0.3 0.7 4.9 0 0.0 0.0
230.0 0.0 496 178.1 0.2 ,
6131 0.2 0.5 4.3 0 0.0 0.0
240.0 0.0 389 178.1 0.2 6113 0.2 0.3 3.8 0 0.0 0.0

180.9 5.3 < m aximum 2-y ear
0.79 < =volu me without 0.78 < vo lume with controls
contr ols
Page 4
Detention Design and Stormwater Credit Summary
ROUTIN

Time
[min]
0 G AND AN

Inflow
[cfs]
0.0 ALYSIS -- 1

Storage
[cubic ft]
0 0-year storm

Stage
[ft]
178.0

Outflow
[cfs]
0.0

Surf. Area
[sq.ft]
6050

Q -barrel

0.0
O
Q -ri
weir
0.0
utlet Hy
ser
orifice
0.0
draulics
a
em.spil
0

Q
outlet'
0.0

Q
outlet2
0.0
1
2 0.1
0.5 0
8 178.0
178.0 0.0
0.0 6050
6051 0.0
0.0 0.0
0.0 0.0
0.5 0
0 0.0
0.0 0.0
0.0
3 1.2 39 178.0 0.0 6056 0.0 0.0 1.2 0 0.0 0.0
4 2.0 108 178.0 0.0 6068 0.0 0.0 2.0 0 0.0 0.0
5 3.1 228 178.0 0.1 6087 0.1 0.2 2.9 0 0.0 0.0
6 4.4 411 178.1 0.2 6117 0.2 0.4 3.9 0 0.0 0.0
7 5.9 668 178.1 0.3 6159 0.3 0.8 5.0 0 0.0 0.0
8 7.5 1,007 178.2 0.4 6214 0.4 1.4 6.1 0 0.0 0.0
9 9.3 1,436 178.2 0.6 6283 0.6 2.3 7.3 0 0.0 0.0
10 11.1 1,958 178.3 0.8 6366 0.8 3.7 8.5 0 0.0 0.0
11 13.0 2,578 178.4 -
1.0 6464 ± 1.0 5.5 9.7 0 0.0 0.0
12 14.8 3,294 178.
5 1.3 6577 1.3 7.8 10.9 0 0.0 - 0.0
13 16.7 -
-,
4,107 -.----
-
178.6 1 .6 6703 1 .6 10.7 12.1 0 0.0 0.0
14 18.4 5,011 178.8 1.9 6843 1.9 14.2 13.3 0 0.0 0.0
15 20.1 6,002 178.9 2.3 6994 2.3 18.4 14.5 0 0.0 0.0
16 21.6 7,073 179.1 2.6 7155 2.6 23.1 15.7 0 0.0 0.0
17 23.0 8,213 179.2 3.0 7326 3.0 28.4 16.8 0 0.0 0.0
18 24.2 9,416 179.4 3.3 7503 3.3 34.2 17.9 0 0.0 0.0
19 25.2 10,671 179.6 3.6 7686 3.6 40.5 18.9 0 0.0 0.0
20 25.9 11,966 179.7 3.8 7873 3.8 47.3 19.9 0 0.0 0.0
21 26.4 13,289 179.9 4.1 8062 4.1 54.3 20.9 0 0.0 0.0
22
23
24 26.6
26.6
26.3 _ 14,627
15,964
17,287
- 180.1
180.2
180.4 4.3
4.6
4.8 8251
8438
8622 4.3
4.6
4.8 61.7
69.1
76.6 21.8
22.6
23.4 0
0
0 0.0
0.0
0.0 0.0
0.0
0.0
25 25.8 18,580 180.5 4.9 8799 4.9 84.0 24.1 0 0.0 0.0
26 25.0 19,829 180.7 5.1 8970 5.1 91.3 24.8 0 0.0 0.0
27 24.0 21,020 180.8 5.3 9131 5.3 98.3 25.4 0 0.0 0.0
28 22.8 22,142 180.9 5.4 9282 5.4 105.0 26.0 0 0.0 0.0
29 21.5 23,182 181.1 5.5 9421 5.5 1111.2 26.5 0 0.0 0.0
30 20.3 24,139 181.2 5.7 9548 5.7 116.9 26.9 0 0.0 0.0
31 19.1 25,015 181.3 5.8 9664 5.8 122.2 27.3 0 0.0 0.0
32 18.0 25,818 181.3 5.8 9770 5.8 127.1 27.7 0 0.0 0.0
33 17.0 26,550 181.4 1 5.9 9866 5.9 131.6 28.0 0 0.0 0.0
34 16.1 27,216 181.5 1 6.0 9953 6.0 135.6 28.3 0 0.0 0.0
35
36 37

38
39
40
41

42 43 15.2
1134.3 .5

12.7
12.0
--.11.3-
10.7
19.5- 27,821

,367
2828,859
29,299
29,6911
30,038
30,342
30,606
30,832 181.6

181.6
181.7
1 181.7
181.8
1 181.8
181.8
{
181.8 6.1

6.1
6.2
6.2
6.2
6.3
6.3
66.3 .4 10032

10103
1 10167
10224
10274
10319
, 10358
1 1104210392 6.1

6.1
6.2
6.2
` 6.2_
I 6.3
1 6.3
66.3 .4 139.3

142.7
I 145.7
148.4
I 150.8
1 153.0
154.9
156.5
157.9 28.5

28.8
29.0
29.2
29.3
29.4
29.6
29.7
29.8 0

0
0
0
0
0
0
0
0 0.0

0.0
0.0
0.0
1 0.0
1 0.0
! 0.0
1 0.0
1 0.0 0.0?

0.
0.0
0.0
0.0
1 0.0
1 0.0
1 0.0
' 0.0
Page b
Detention Design and Stormwater Credit Summary
44 9.0 31,022 181.9 6.4 10446 6.4 159.1 29.8 0 0.0 0.0
45 8.5 31,179 181 .9 6.4 10466 6.4 160.0 29.9 0 0.0 0.0
46 8.0 31,305 181.9 6.4 10482 6.4 160.8 29.9 0 0.0 0.0
47 7.6 31,402 181.9 6.4 10494 6.4 161.4 30.0 0 0.0 0.0
48 7.1 31,471 181.9 6.4 10503 6.4 161 .8 30.0 0 0.0 0.0
181 .9 6.4 < _ = -maximum 10-yr
Page 6
Detention Design and Stormwater Credit Summary
TOUTIN G AND AN ALYSIS -- 2 5 -year stor m
- Outlet Hy draulics
Time Inflow Storage Stage Outflow Surf. Area Q barrel Q riser Q Q Q
[mini [cfs] [cubic ft] [ft] [cfsI [sq.ft] weir orifice em.spil outlet1 outlet2

0 0
0 0 178.0 0.0 6050 0.0 0.01 0.0 0 0.0 0.0
1 .
0
1 0 178.0 0.0 6050 0.0 0.0 0.0 0 0.0 0.0
2 .
0.5 8 178.0 0.0 6051 0.0 0.0 0.6 0 0.0 0.0
3 1
2 41 178.0 0.0 6057 0.0 0.0, 1.2 0 0.0 0.0
4 .
2.1 113 178.0 0.0 6068 0.0 0.1 2.1 0 0.0 0.0
5 3
3 238 178.0 0.1 6089 0.1 0.21 3.0 0 0.0 _ 0.0
6 .
4
7 430 1781 0.2 6120 0.2 0.4 4.0 0 0.0 0.0
7 .
2
6 699 178.1 0.3 6164 0.3 0.8 5.1 0 0.0 0.0
8 .
7
9 056
1 178.2 0.4 6221 0.4 1 .5 6.3 0 0.0 0.0
9 .
9
8 ,
507
1 178.2 0.6 6294 0.6 2.5 7.5 0 0.0 0.
10 .
11
7 ,
058
2 178.3 0.8 6382 0.8 4.0 8.7 0 0.0 0.0
11 .
13
7 ,
714
2 178.4 1.1 6486 1.1 5.9 10.0 0 0.0 0.0
12 .
8
15 ,
474
3 178.5 1.3 6605 1.3 8.4 11.2 -
0 0.0 0.0

13 .
17
8 ,
----- -
-4
-340- --- -
17817
1.7
6739
1.7
11.6
12.5
0
0.0
0.
--
14 .
----- --
19
8 ,
--- ---
308
5
178.8
2.0
6888
2.0
15.5
13.7
0
0.0
0.0
15 .
21
6 ,
372
6 179.0 2.4 7050 2.4 20.0 14.9 0 0.0 0.0
16 .
23.4 ,
7,528 179.1 2.8 7224 2.8 25.2 16.1 0 0_.0 _ 0.0
17 25
0 767
8 179.3 3.1 7408 3.1 31.1 17.3 0 0.0 0.0

18 .
- - ---
5
26 ,
-- - -
082
10 -
179.5 - - -
3.4 -- _ ?
7601
3.4
37.6
18.4
0
0.0
0.0
19 .
27
7 ,
1 1
465 179.7 3.7 7801 3.7 44.6 19.5 0 0.0 0.
20 .
28
7 ,
903
12 179.9 4.0 8007 4.0 52.3 20.6 0 0.0 0.0
21 .
29
5 ,
384
14 180.0 4.3 8217 4.3 60.3 21.6 0 0.0 0.0
-
22 .
0
30 ,
,
896
15
180.2
4.5
8429 i1
4.5 ? 68.7 22.6 0 0.0 0.0

23 .
30.2 ,
17,422
180.4
4.8
8640 4.8 1i 77.4 23.5 0 0.0 0.0

-
-
24 2
30 948
18 180.6 5.0 {
8850 5.0 1 86.2 1 24.3 0 0.0 0.0
25 .
29.9 ,
20,458 180.8 5.2 9055 5.2 95.0 25.1 0 0.0 0.0
26 29.3 21,938 180.9 5.4 9255 5.4 103.8 25.9 0 0.0 0.0

27 ---------- -
28
4 -
371
23
181.1
5.6
9446
5.6
112.3
26.6
0
0.0
0.0
28 .
27
4 ,
744
24 181.2 5.7 9628 5.7 120.6 27.2 0 0.0 0.
29 .
1
26 ,
043
26 181.4 5.9 9799 5.9 128.5 27.8 0 0.0 0.
30 .
24
7 ,
256
27 181.5 6.0 9958 6.0 135.9 28.3 0 0.0 0.
31 .
4
23 ,
378
28 181.6 6.1 10104 6.1 142.7 28.8 0 0.0 0.
32 .
1
22 ,
413
29 181.7 6.2 10238 6.2 149.1 29.2 0 0.0 0.
33 .
9
20 ,
366
30 181
8 6.3 10361 6.3 155.0 29.6 0 0.0 0.0
34 .
19
8 ,
,
241
31 .
181.9 6.4 10474 6.4 160.4 29.9 0 0.0 0.0
35 .
18.7 ,
32,044 182.0 6.5 10576 6.5 165.4 30.2 0 0.0
-
- 0.0

-
--
36 17.7 32,778 182.1 6.5 10670 6.5 170.0 30.5 0 .0
0 0
0.
37 16.7 33,447 182.1 6.6 10755 6.6 174 - 1 ' 30.7 0 0.0 0.0
38 15.8 34,055 182.2 6.6 10832 6.6 177.9 31.0 0 0.0 0.0
39 15.0 i 34,605 182.2 1 6.7 10902 6.7 181.41, 31.2 0 0.0
- 0.0
--
40 14.2 1 35,101 182.3 6.7 1 10964 6.7 184.51 31.3 0 0-.0 0 0
41 ? 134 I 35,546 182.3 6.8 11020 1 6.8 1187.31: 31.5

? 0 0.0
- 0.0

42
12.7 -
35,942
i ?
? 182.4
6.8
11070 i 6.8 ' 31.6
189.71 0 0.0 0.0
43 ?
12.0 36,294 182.4 6.8 11114 6.8 191.91, 31.8 0 0.0 0.0
Page 7
Detention Design and Stormwater Credit Summary
44 11.3 36,602 182.4 6.9 11153 6.9 193.9 31.9 0 0.0 0.0
45
46
47 10.7
10.1
9.6 36,869
37,099
37,293 182.5
182.5
182.5 6.9
6.9
6.9 11187
11215,
11239 6.9
6.9
6.9 195.5
197.0
198.2 32.0
32.0
321 0
0
0 0.0
0.0
0.0 0.0
0.0
0.9-
48 9.1 37,452 182.5 6.9 11259 6.9 199.2 32.2 0 0.0 -0.0-
49 8.6 37,580 182.5 6.9 11275 6.9 200.0 32.2 0 0.0 0.0
50 8.1 37,678 182.5 7.0 11288 7.0 200.6 32.2 0 0.0 0.0
51 7.7 37,747 182.5 7.0 11296 7.0 201.1 32.3 0 0.0 0.0
52 7.3 37,790 182.6 7.0 11302 7.0 201.3 32.3 0 0:9 0.0
53 6.9 37,807 182.6 7.0 11304 7 0 201.4 32.3 0 0.0 0.0
54 6.5 37,801 182.6 7.0 -
11303 7.0
[ 201.4 32.3 0 0.0 0.0-
I 1 4
182.6 7.0 _
< = = m _
aximum (50 -yr)
Page 8
Detention Design and Stormwater Credit Summary
NEW ELEMENTARY SCHOOL- ROANOKE RAPIDS, NC
DETENTION POND #2
HYDROGRAPH PARAMETERS

Item Existing Proposed

Drainage Area
Pervious [acres] 11.51 0.00 Ref: Topgraphic
Impervious [acres] 0.00 2.93 Mapping
Drainage Area [acres] 11.51 2.93
100.0% < %impervious
Rational C
Pervious C 0.35 0.40 Ref: Hydrology and Water Quantity
Impervious C 0.95 0.95 Wanielista, Martin
Composite Rational C 0.35 0.95

Time o f Concentration, Tc

Length 1058 454
H 16 4
TC [min] 8.4 5.5 Kirpich's Equation
Use 5.0 mi n
Intensi ties, I
2-year [in/hr] 6.05 6.05 Ref: City of Greensboro
10-year [in/hr] 7.58 7.58 Engineering Department
25-year [in/hr] 8.60 8.60

Peak D ischarge, Qp Q = CIA
2-year [cfsl 24.37 16.84
10-year [cfsl 30.54 21.10
25-year [cfs] 34.65 23.94

Curve Number, CN
Pervious CN 55.0 55.0
Impervious CN 98.0 98.0
Composite CN 55.0 98.0
S 8.2 0.2

Precipi tation Amount, P for six hour storm
2-year [inches] 2.78 2.78
10-year [inches] 3.94 3.94
25-year [inches] 4.62 4.62

Page 1
Detention Design and Stormwater Credit Summary
Volume of Runoff, V, from six-hour storm
2-year [inches] 0.14 2.55 v = ((p-.2S)"2)/(p+.8s)
10-year [inches] 0.51 3.71
25-year [inches] 0.80 4.38

2-year [acre-feet] 0.13 0.62
10-year [acre-feet] 0.49 0.90
25-year [acre-feet] 0.76 1.07

Time-to-Peak, Tp ( for use in routing)
2-year [minutes] _ 19.3 _ Tp = V/(1.39*Qp)
10-year [minutes] 22.4
25-year [minutes] 23.4

Time Interval for R outing
2-year [minutes] 1
10-year [minutes] 1
25-year [minutes] 1 for peak definition
25-year [minutes] 60 to ensure basin empties

BASIN PARAMETERS

Riser Barrel Emergency Spillway _
24 = Dia. riser (inches) 15 = Dia. barrel (inches) 0 = Length
3.3 = Cw riser 0.55 = Cd barrel 0.00 = Cw
183.5 = Crest elev. riser 183.5 = Invert elev. barrel 0.0 = Crest elevation
0 = height outlet 1 [in.]
0 = length outlet1 [ft] Basin
0 = Cd outlet 1 35 = width @ invert barrel
0.0 = Invert outlet 1 70 = length @ invert barrel
0 = height outlet 2[in.] 3 :1 = shape factor
0 = length outlet 2 [ft] 183.5 = Initial elev. water level
0 = Cd outlet 2
0.0 = Invert outlet 2
Results
Event Pre-Development Post Development Post Development Post Development
With Controls Field Total
Peak Volume Peak Peak Volume Peak Volume Peak
Discharge Discharge Elevation Discharge Discharge
[cfs] [ac-ft] [cfs] [ac-ft] [cfs] [ac-ft] [cfs]

2 24.37 0.135 8.58 186.64 0.623 16.0 0.625 24.6
10 30.54 n/a 10.25 187.72 20.0 30.3
25 34.65 n/a 11.14 188.37 22.7 33.9

Page 2
Detention Design and Stormwater Credit Summary
ROUTI NG AND AN ALYSIS -- 2-year storm
Outlet Hydraulics
-
Time Inflow Storage Stage Outflow Surf. Area Q barrel Q_riser Q Q Q
mi
n [cfs] [cubic ft] [ft] [cfs] [sq.ft] weir orifice em.spil outlet1 outlet2

r 0.0 0 183.5 0.0 2450 0.0 0.0 0.0 0 0.0 0.0
o 0.1 0 183.5 0.0 2450 0.0 0.0 0.0 0 0.0 0.0
. 0.4 7 183.5 0.0 2452 0.0 0.0 0.8 0 0.0 0.0
3.0 1.0 33 183.5 0.0 2458 0.0 0.0 1.8 0 0.0 0.0
4.0 1.7 90 183.5 0.1 2473 0.1 0.1 2.9 0 0.0 0.0
5.0 2.6 186 183.6 0.3 2498 0.3 0.4 4.1 0 0.0 0.0
6.0 3.7 329 183.6 0.5 2534 0.5 1.0 5.5 0 0.0 0.0
7.0 4.9 524 183.7 0.7 2583 0.7 2.0 6.9 0 0.0 0.0
8.0 6.2 775 183.8 1.0 2645 _ 1.0 3.5 8.3 0 0.0 0.0
9.0 7.5 1,083 183.9 1.4 2721 1.4 5.6 9.8 0 0.0 0.0
10.0 8.9 1,449 184.1 1.9 2809 1.9 8.5 11.2 0 0.0 0.0
11.0 10.3 1,869 184.2 2.4 2909 2.4 12.1 12.7 0 0.0 0.0
12.0 11.6 2,341 184.4 2.9 3019 2.9 16.5 14.0 0 0.0 0.0
13.0 12.8 2,858 184.5 3.5 3137 3.5 21.7 15.4 0 0.0 0.0
14.0 13.9 3,413 184.7 4.1 3262 4.1 27.5 16.6 0 0.0 0.0
15.0 14.9 4,000 184.9 4.7 3392 4.7 33.8 17.8 0 0.0 0.0
16.0 15.7 4,608 185.1 5.2 3525 5.2 _ 40.6 18.9 0 0.0 0.0
17.0 16.3 5,232 185.2 5.7 3659 5.7 47.8 20.0 0 0.0 0.0
18.0 16.7 5,864 185.4 6.2 3792 6.2 55.2 21.0 0 0.0 0.0
19.0 16.8 6,494 185.6 6.5 3923 6.5 62.6 21.9 0 0.0 0.0
20.0 16.8 7,111 185.8 6.9 4051 6.9 70.0 22.7 0 0.0 0.0
21.0 16.5 7,705 185.9 7.2 4171 7.2 77.2 23.4 0 0.0 0.0
22.0 16.0 8,263 186.0 7.5 4284 7.5 84.0 24.1 0 0.0 0.0
23.0 15.4 8,777 186.2 7.7 4387 7.7 90.3 24.7 0 0.0 0.0
24.0 14.5 9,235 186.3 7.9 4478 7.9 96.0 25.2 0 0.0 0.0
25.0 13.6 9,629 186.4 8.1 4555 8.1 100.8 25.6 0 0.0 0.0
26.0 12.7 9,957 186.4 8.2 4619 8.2 104.9 26.0 0 0.0 0.0
27.0 11.9 10,224 186.5 8.3 4672 8.3 108.2 26.2 _ 0 0.0 0.0
28.0 11.1 10,435 186.6 8.4 4713 8.4 110.8 26.4 0 0.0 0.0
29.0 10.4 10,594 186.6 8.5 4744 8.5 112.8 26.6 0 0.0 0.0
30.0 9.7 10,707 186.6 8.5 4765 8.5 114.2 26.7 0 0.0 0.0
31.0 9.1 10,776 186.6 8.6 4779 8.6 115.1 26.8 1 0 0.0 0.0
32.0 8.5 10,805 186.6 8.6 4784 8.6 115.5 26.8 0 0.0 0.0
33.0 7.9 10,799 186.6 8.6 4783 8.6 115.4 26.8 0 0.0 0.0
34.0 7.4 10,760 186.6 8.6 4776 8.6 114.9 26.8 0 0.0 0.0
35.0 6.9 10,690 186.6 8.5 4762 8.5 114.0 26.7 0 0.0 0.0
36.0 6.5 10,594 186.6 8.5 4743 8.5 112.8 26.6 0 0.0 0.0
37.0 6.1 10,472 186.6 8.4 4720 8.4 111.3 26.5 0 0.0 0.0
38.0 5.7 10,328 186.5 8.4 4692 8.4 109.5 26.3 0 0.0 0.0
39.0 5.3 10,164 186.5 8.3 4660 8.3 107.5 26.2 0 0.0 0.0
40.0 4.9 9,982 186.5 8.3 4624 8.3 105.2 26.0 0 0.0 0.0
41.0 4.6 9,783 186.4 8.2 4585 8.2 102.8 25.8 0 0.0 0.0
42.0 4.3 9,570 186.4 8.1 4544 8.1 100.1 25.6 0 0.0 0.0
50.0 2.5 7,536 185.9 7.1 4137 7.1 75.2 23.2 0 0.0 0.0
Page 3
Detention Design and Stormwater Credit Summary
60.0 1.3 4,833 185.1 5.4 3573 5.4 43.2 19.3 0 0.0 0.0
70.0 0.7 2,718 184.5 3.4 3105 3.4 20.3 15.0 0 0.0 0.0
80.0 0.3 1,433 184.0 1.9 2805 1.9 8.4 11.2 0 0.0 0.0
90.0 0.2 728 183.8 1.0 2633 1.0 3.2 8.1 0 0.0 0.0
100.0 0.1 362 183.6 0.5 2542 0.5 1.1 5.8 0 0.0 0.0
110.0 0.0 179 183.6 0.2 2496 0.2 0.4 4.1 0 0.0 0.0
120.0 0.0 89 183.5 0.1 2473 0.1 0.1 2.9 0 0.0 0.0
130.0 0.0 46 183.5 0.1 2462 0.1 0.1 2.1 0 0.0 0.0

186.6 8.6 < = = maximum 2-year
0.62 < _ =volume without 0.62 < = = volume with controls
controls
Page 4
Detention Design and Stormwater Credit Summary
ROUTING AND ANALYSIS -- 10-year storm
Outlet Hydraulics
Time Inflow Storage Stage Outflow Surf. Area Q_barrel Q_riser Q Q Q
[min] [cfs] [cubic ft] [ft] [cfs] [sq.ft] weir orifice em.spil outlet1 outlet2

0 0.0 0 183.5 0.0 2450 0.0 0.0 0.0 0 0.0 0.0
1 0.1 0 183.5 0.0 2450 0.0 0.0 0.0 0 0.0 0.0
2 0.4 6 183.5 0.0 2452 0.0 0.0 0.8 0 0.0 0.0
3 0.9 31 183.5 0.0 2458 0.0 0.0 1.7 0 0.0 0.0
4 1.6 84 183.5 0.1 2472 0.1 0.1 2.8 0 0.0 0.0
5 2.5 174 183.6 0.2 2495 0.2 0.4 4.0 0 0.0 0.0
6 3.5 309 183.6 0.4 2529 0.4 0.9 5.3 0 0.0 0.0
7 4.7 495 183.7 0.7 2576 0.7 1.8 6.7 0 0.0 0.0
8 6.0 736 183.8 1.0 2635 1.0 3.2 8.1 0 0.0 0.0
9 7.3 1,035 183.9 1.4 2709 1.4 5.3 9.6 0 0.0 0.0
10 8.8 1,393 184.0 1.8 2796 1.8 8.1 11.0 0 0.0 0.0
11 10.3 1,811 184.2 2.3 2895 2.3 11.6 12.5 0 0.0 0.0
12 11.7 2,287 184.3 2.9 3006 2.9 16.0 13.9 0 0.0 0.0
13 13.2 2,818 184.5 3.5 3128 3.5 21.3 15.3 0 0.0 0.0
14 14.6 3,401 184.7 4.1 3259 4.1 27.3 16.6 0 0.0 0.0
15 15.9 4,030 184.9 4.7 3399 4.7 34.2 17.9 0 0.0 0.0
16 17.1 4,700 185.1 5.3 3544 -.5.3 41.7- --- 19.1 0 0.0 0.0
17 18.2 5,408 185.3 5.8 3696 5.8 49.8 20.3 0 0.0 0.0
18 19.2 6,151 185.5 6.3 3852 6.3 58.5 21.4 0 0.0 0.0
19 19.9 6,920 185.7 6.8 4011 6.8 67.7 22.4 0 0.0 0.0
20 20.5 7,708 185.9 7.2 4172 7.2 77.3 23.5 0 0.0 0.0
21 20.9 8,506 186.1 7.6 4333 7.6 87.0 24.4 0 0.0 0.0
22 21.1 9,304 186.3 8.0 4491 8.0 96.8 25.3 0 0.0 0.0
23 21.1 10,091 186.5 8.3 4646 8.3 106.6 26.1 0 0.0 0.0
24 20.8 10,857 186.7 8.6 4794 8.6 116.1 26.9 0 0.0 0.0
25 20.4 11,591 186.8 8.9 4935 8.9 125.2 27.5 0 0.0 0.0
26 19.8 12,282 187.0 9.1 5067 9.1 133.9 28.2 0 0.0 0.0
27 19.0 12,922 187.1 9.3 5188 9.3 141.9 28.7 0 0.0 0.0
28 18.0 13,501 187.2 9.5 5297 9.5 149.1 29.2 0 0.0 0.0
29 17.0 14,011 187.3 9.7 5392 9.7 155.5 29.6 0 0.0 0.0
30 16.0 14,450 187.4 9.8 5474 9.8 161.0 30.0 0 0.0 0.0
31 15.1 14,824 187.5 9.9 5543 9.9 165.7 30.2 0 0.0 0.0
32 14.3 15,137 187.6 10.0 5601 10.0 169.6 30.5 0 0.0 0.0
33 13.5 15,393 187.6 10.1 5648 10.1 172.8 30.7 0 0.0 0.0
34 12.7 15,596 187.7 10.2 5685 10.2 175.3 30.8 0 0.0 0.0
35 12.0 15,751 187.7 10.2 5713 10.2 177.3 30.9 0 0.0 0.0
36 11.3 15,859 187.7 10.2 5733 10.2 178.6 31.0 0 0.0 0.0
37 10.7 15,925 187.7 10.2 5745 10.2 179.5 31.1 0 0.0 0.0
38 10.1 15,952 187.7 10.3 5750 10.3 179.8 31.1 0 0.0 0.0
39 9.5 15,942 187.7 10.3 5748 10.3 179.7 31.1 0 0.0 0.0
40 9.0 15,898 187.7 10.2 5740 10.2 179.1 31.0 0 0.0 0.0
41 8.5 15,822 187.7 10.2 5727 10.2 178.2 31.0 0 0.0 0.0
42 8.0 15,718 187.7 10.2 5707 10.2 176.9 30.9 0 0.0 0.0
43 7.5 15,586 187.6 10.2 5683 10.2 175.2 30.8 0 0.0 0.0
Page 5
Detention Design and Stormwater Credit Summary
44 7.1 15,430 187.6 10.1 5655 10.1 173.3 30.7 0 0.0 0.0
45 6.7 15,251 187.6 10.1 5622 10.1 171.0 _ 30.6 0 0.0 0.0
46 6.3 15,051 187.5 10.0 5585 10.0 168.5 30.4 0 0.0 0.0
47 6.0 14,831 187.5 9.9 5544 9.9 165.8 30.2 0 0.0 0.0
48 5.6 14,594 187.5 9.9 5501 9.9 162.8 30.1 0 0.0 0.0
49 5.3 14,341 187.4 9.8 5454 9.8 159.6 29.9 0 0.0 0.0
50 5.0 14,074 187.3 9.7 5404 9.7 156.3 29.7 0 0.0 0.0
51 4.7 13,793 187.3 9.6 5352 9.6 152.8 29.4 0 0.0 0.0
52 4.5 13,501 187.2 9.5 5297 9.5 149.1 29.2 0 0.0 0.0
62 2.5 10,183 186.5 8.3 4664 8.3 107.7 26.2 0 0.0 0.0
72 1.4 6,774 185.7 6.7 3981 6.7 66.0 22.2 0 0.0 0.0
82 0.8 3,939 184.9 4.7 3379 4.7 33.2 17.7 0 0.0 0.0
92 0.4 2,091 184.3 2.7 2961 2.7 14.2 13.3 0 0.0 0.0
102 0.2 1,071 183.9 1.4 2718 1.4 5.5 9.7 -0 0.0 0.0
112 0.1 541 183.7 0.7 2587 0.7 2.1 7.0 0 0.0 0.0
122 0.1 273 183.6 0.4 2520 0.4 0.8 _ 5.0 0 0.0 0.0
132 0.0 139 183.6 0.2 2486 0.2 0.3 3.6 0 0.0 0.0
133 0.0 130 183.6 0.2 2483 0.2 0.3 3.5 0 0.0 0.0

187.7 10.3 < maximum 10-yr

Page 6
Detention Design and Stormwater Credit Summary
ROUTI NG AND ANALYSIS -- 25 -year storm
Outlet Hydraulics
Time Inflow Storage Stage Outflow Surf. Area Q_barrel Q_riser Q Q Q
[min] [cfs] [cubic ft] [ft] [cfs] [sq.ft] weir orifice em.spil outlet1 outlet2

0 0.0 0 183.5 0.0 2450 0.0 0.0 0.0 0 0.0 0.0
1 0.1 0 183.5 0.0 2450 0.0 0.0 0.0 0 0.0 0.0
2 0.4 6 183.5 0.0 2452 0.0 0.0 0.8 0 0.0 0.0
3 1.0 32 183.5 0.0 2458 0.0 0.0 1.7 0 0.0 0.0
4 1.7 88 183.5 0.1 2473 0.1 0.1 2.9 0 0.0 0.0
5 2.6 182 183.6 0.3 2497 0.3 0.4 4.1 0 0.0 0.0
6 3.7 323 183.6 0.4 2532 0.4 1.0 5.5 0 0.0 0.0
7 4.9 518 183.7 0.7 2581 0.7 1.9 6.9 0 0.0 0.0
8 6.3 771 183.8 1.0 2644 1.0 3.5 8.3 0 0.0 0.0
9 7.8 1,087 183.9 1.4 2721 1.4 5.7 9.8 0 0.0 0.0
10 9.3 1,465 184.1 1.9 2813 1.9 8.6 11.3 0 0.0 0.0
11 10.9 1,908 184.2 2.4 2918 2.4 12.5 12.8 0 0.0 0.0
12 12.5 2,415 184.4 3.0 3036 3.0 17.3 14.2 0 0.0 0.0
13 14.1 2,982 184.6 3.7 3165 3.7 23.0 15.6 0 0.0 0.0
14 15.6 3,608 184.8 4.3 3306 4.3 29.6 17.0 0 0.0 0.0
15 17.1 4,287 185.0 5.0 3455 5.0 37.0 18.3 0 0.0 0.0
16 18.5 5,017 185.2 5.6 3613 5.6 45.3 19.6 0 0.0 0.0
17 19.8 5,796 185.4 6.1 3778 6.1 54.3 20.9 0 0.0 0.0
18 21.0 6,619 185.6 6.6 3949 6.6 64.1 22.0 0 0.0 0.0
19 21.9 7,480 185.8 7.1 4126 7.1 74.5 23.2 0 0.0 0.0
20 22.7 8,371 186.1 7.5 4306 7.5 85.3 24.2 0 0.0 0.0
21 23.3 9,283 186.3 8.0 4487 8.0 96.6 25.3 0 0.0 0.0
22 23.7 10,206 186.5 8.3 4668 8.3 108.0 26.2 0 0.0 0.0
23 23.9 11,130 186.7 8.7 4847 8.7 119.5 27.1 0 0.0 0.0
24 23.9 12,043 186.9 9.0 5022 9.0 130.9 28.0 0 0.0 0.0
25 23.6 12,935 187.1 9.3 5191 9.3 142.0 28.7 0 0.0 0.0
26 23.2 13,793 187.3 9.6 5352 9.6 152.8 29.4 0 0.0 0.0
27 22.5 14,608 187.5 9.9 5503 9.9 163.0 30.1 0 0.0 0.0
28 21.7 15,367 187.6 10.1 5643 10.1 172.5 30.6 0 0.0 0.0
29 20.6 16,062 187.7 10.3 5771 10.3 181.2 31.2 0 0.0 0.0
30 19.6 16,684 187.9 10.5 5884 10.5 188.9 31.6 0 0.0 0.0
31 18.5 17,231 188.0 10.6 5983 10.6 195.8 32.0 0 0.0 0.0
32 17.5 17,705 188.1 10.7 6068 10.7 201.7 32.3 0 0.0 0.0
33 16.6 18,111 188.1 10.8 6141 10.8 206.8 32.6 0 0.0 0.0
34 15.7 18,455 188.2 10.9 6203 10.9 211.0 32.8 0 0.0 0.0
35 14.8 18,739 188.2 11.0 6254 11.0 214.6 33.0 0 0.0 0.0
36 14.0 18,969 188.3 11.0 6295 11.0 217.4 33.1 0 0.0 0.0
37 13.2 19,147 188.3 11.1 6326 11.1 219.7 33.2 0 0.0 0.0
38 12.5 19,277 188.3 11.1 6350 11.1 221.3 33.3 0 0.0 0.0
39 11.9 19,362 188.4 11.1 6365 11.1 222.3 33.4 0 0.0 0.0
40 11.2 19,405 188.4 11.1 6372 11.1 222.9 33.4 0 0.0 0.0
41 10.6 19,409 188.4 11.1 6373 11.1 222.9 33.4 0 0.0 0.0
42 10.0 19,376 188.4 11.1 6367 11.1 222.5 33.4 0 0.0 0.0
43 9.5 19,310 188.4 11.1 6355 11.1 221.7 33.3 0 0.0 0.0
Page 7
Detention Design and Stormwater Credit Summary
44 9.0 19,212 188.3 11.1 6338 11.1 220.5 33.3 0 0.0 0.0
45 8.5 19,084 188.3 11.1 6315 11.1 218.9 33.2 0 0.0 0.0
46 8.0 18,930 188.3 11.0 6288 11.0 217.0 33.1 0 0.0 0.0
47 7.6 18,750 188.3 11.0 6256 11.0 214.7 33.0 0 0.0 0.0
48 7.2 18,546 188.2 10.9 6219 10.9 212.2 32.8 0 0.0 0.0
49 6.8 18,321 188.2 10.9 6179 10.9 209.4 32.7 0 0.0 0.0
50 6.4 18,076 188.1 10.8 6135 10.8 206.3 32.5 0 0.0 0.0
51 6.1 17,812 188.1 10.8 6088 10.8 203.0 32.4 0 0.0 0.0
52 5.7 17,532 188.0 10.7 6037 10.7 199.5 32.2 0 0.0 0.0
53 5.4 17,236 188.0 10.6 5984 10.6 195.8 32.0 0 0.0 0.0
54 5.1 16,926 187.9 10.5 5928 10.5 192.0 31.8 0 0.0 --- 0.0
188.4 11.11 < == maximum (50-yr)
Page 8