20220331_6_NPDES

Attachment 6
Stormwater NOI Package
REcEW-
MAR 31 Yu l
LAND QUALITY
D0114IN0 p ftoGRAI

Memo
SUBJECT
Buechel Stone — Steel Gray Mine Stormwater Application
DATE
October 29, 2021
DEPARTMENT
30105159
COPIES TO
Chris Bucy— Buechel Stone
Brad Karis — Buechel Stone
PARCADIS
TO
NC DEQ — DEMLR Stonmwater
OUR REF
30105159
PROJECT NUMBER
30105159
NAME
Christopher Peters, PG
517.324.5052, 517.927.3611 (m), [e-mail]
See attached for Stormwater Permit Application for Buechel Stone Corporation Steel Gray Mine, Spruce Pine,
North Carolina.
Section 1 —Application Form
Section 2 - Figures (D-sized Plan Sheets)
Figure 1 —Quadrangle Map
Figure 2 — Site Plan — Proposed Plan Modification
Figure 3 —Approximate Drainage Area and Stormwater Features
Section 3 —Attachment 1
Details of erosion and stormwater management features
Stormwater calculations
Arcadis U.S., Inc., 300 S Washington Square, Suite 315, Lansing, Michigan, 517 337 0111, www a,cad,s com
1/1
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Section 1
Application Form

Division of Energy, Mineral, and Land Resources land Quality Section
National Pollutant Discharge Elimination System
NCGO20000
This general permit covers STORMWATER AND/OR WASTEWATER DISCHARGES
associated with activities under SIC (Standard Industrial Classification) Code 14
[Mineral Mining Industry] except for: peat mining, coal mining, metal mining,
oil and gas extraction, tourist gem mines, NCDOT borrow pits, in -stream sand
mining, and discharges from mining operations which are intermixed on site
with stormwater from concrete operations. You can find information on the
DEMLR Stormwater Program at deq.nc.gov/SW.
Directions: Print or type all entries on this application form. Send the original,
signed application with all required items listed in Item (9) below to: NCDEMLR
FOR AGENCY USE ONLY
Date Received
Year Month Da
Certificate of Coverage
Check # I Amount
Permit Assigned to
Stormwater Program, 512 N. Salisbury St.,1612 MSC, Raleigh, NC 27699-1612.
The submission of this form does not guarantee coverage under the General Permit. Prior to coverage under this
General Permit a site inspection will be conducted.
1. Owner/Operator (to whom all permit correspondence will be mailed):
Name of legal organizational entity:
Legally responsible person as signed in Item (10) below:
Buechel Stone Corporation
Chris Bucy
Street address:
City:
State and zip code:
7274 Hwy 221 N
Marion
NC, 28752
Telephone number:
Email address:
828-756-8220
[e-mail]
'%4. Industrial Facility (facility being permitted):
Facility name:
Facility environmental contact:
Steel Gray Mine
Chris Bucy
Street address:
city:
State and zip code:
Altapass Hwy
Spruce Pine
NC, 28777
Telephone Number:
Email address:
Latitude of entrance: 35.904930
Longitude of entrance:-82.032428
Parcel Identification Number (PIN)
1709-00-27-4028
4-digit SIC code:
Facility is:
1
Date operation is to begin or began:
1499
[]New []Proposed Existing
2010
Brief description of the types of minerals mined at this facility:
black quartzite
Is this a processing -only facility for materials mined elsewhere?
Is this an Inactive mine site?
❑ Yes
❑ Yes
I] No
I] No
Does total area of this mine site Include ready -mixed concrete plant and/or asphalt plant areas?
❑Yes, and has separate NPDES stormwater permits (provide permit numbers):
❑ Yes, and does not have separate NPDES stormwater permits
E] No
Does this facility already have a valid Mining Permit from DEMLWs Land Quality Section?
OYes (please provide the Mining Permit Number) 61-19
❑ No (please indicate the status of the Mining Permit application)
Page 1 of 9

Are you applying for a discharge permit in the same location as a previously permitted mine?
❑ Yes (please provide permit number and mine name)
❑° No
If the stormwater discharges to a municipal separate storm sewer system (MS4), name the operator of the MS4:
El N/A
3. Consultant (if aoolicable):
4.
Name of consultant:
Consulting firm:
Christopher S. Peters
Arcadia US, Inc.
Street address:
City:
State and zip code:
300 S Washington Square Suite 315
Lansing
MI 48933
Telephone number:
Email address:
517-324-5052
[e-mail]
ueveiopment Arnwties ana esurrers
Mining operation will precede development activities at this site:
❑ Yes
❑� No
Mine is located within one of the 20 Coastal Counties, and will it add more than 10,000 ftz of impervious surface:
❑ Yes (to both)
❑ No, this mine is within one of the 20 Coastal Counties, but will not at more than 10,000 ftz of impervious surface
❑� No, this mine is not within one of the 20 Coastal Counties
Mine is in the Neuse, Tar -Pamlico, or Catawba River Basins, OR in the Randleman or Jordan Water supply Watersheds?
[]Yes (specify size of stream buffers)
❑� No
S. Mine Dewaterine
Mine dewatering will occur at this site:
❑ Yes ❑� No (mark N/A for the rest of this section)
Mine dewatering from this facility will be discharged to:
❑Surface Waters and/or Wetlands
[]Other (specify)
❑Mine will not discharge dewatering to Surface Waters and/or Wetlands; specify how dewatering will occur and where
water will be directed:
❑• N/A
Wetlands and/or Surface Waters are within 40V of the mine pit perimeter:
404/401 Certification permits required:
[]Yes (specify distance)
❑ Yes (briefly describe)
❑No
No
❑✓ N/A
❑r N/A
Have you been required to obtain a wetland delineation certified by the US Army Corps of Engineers?
❑Yes (please attach to this application) ❑� No
6. Wastewater Treatment
Will this facility wash mined materials?
❑Yes ❑� No
Will discharges of process wastewater treatment systems occur (including possible recycle system overflows)
❑Yes (please describe)
❑° No
Page 2 of 8
M

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Will this facility employ chemical additives to flocculate suspended solids?
❑Yes (specify name/manufacturer/quantity of daily use)
❑✓ No
Note: please visit: https://files.nc.goy/ncdeg/Water+Quality/Environmental+Sciences/ATU/PAMS 30 18.pdf for list of
approved PAMS
Will any of the wastewater treatment facilities at this mine overflow only during rainfall events that exceed the 10-yr, 24-hr
rainfall event?
❑ Yes (specify which systems)
❑� No
Are wastewater treatment facilities (including recycle systems) planned in the 300-yearflood plain?
[]Yes ❑• No
Wastewater Treatment Alternative Review as required by 15A NCAC 2H.0105(c)(2)
Types of wastewater this mine site will discharge: ❑ Mine Dewatering []Process Wastewater
Types of wastewater considered for this alternative review: ❑ Mine Dewatering ❑ Process Wastewater
Are there existing sewer lines within a one -mile radius?
❑ Yes
❑ Wastewater treatment plant will accept wastewater
❑ Is feasible to connect (explain)
❑ Is not feasible to connect (explain)
❑ Wastewater treatment plant will not accept wastewater (please attach letter documenting this)
❑° No
Are you already proposing a closed -loop recycle system (CLRS) that meets design requirements of 15A NCAC 2T .10000?
❑ Yes, for dewatering
❑ Yes, for process wastewater
❑ Yes, for both
❑ No, this option is technologically feasible (explain)
❑ No, this option is not technologically feasible (explain)
❑ No, this option is otherwise feasible (explain)
❑No, this option is otherwise not feasible (explain)
Eventually water would have to be discharged to surface water. Surface water runs downhill and unless it is discharged to groundwater eventually it would have to be discharged.
What is the feasibility of building a CLRS compared to direct surface water discharge?
Surface or Subsurface Disposal System
❑ A surface or subsurface disposal system is technologically feasible (explain)
❑ A surface or subsurface disposal system is not technologically feasible (explain)
❑ A surface or subsurface disposal system is otherwise feasible to implement (explain)
❑• A surface of subsurface disposal system is not otherwise feasible to implement (explain)
Given the low permeability of the rock discharge to groundwater is not feasible.
What is the feasibility of employing a subsurface of surface discharge as compared to a direct discharge to surface waters?
Direct discharge to surface water Is the mast Ietlmolaglrally feasible option. Stormwater mmAll be retained In a sedimentation basin before discharge to remove Particulate metier
Direct Discharge to surface waters is the most environmentally sound alternative to all reasonably cost-effective options
for the wastewaters being considered?
DYes
❑ No
Page 3 of 8

If this review Included all wastewater discharge types, would excluding some types make any of the above non -discharge
options feasible for some the wastewaters?
❑ Yes
S No
7. Outfalls(s) At least one outfall is required to be eligible for coverage.
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is impaired.
001
1 North Toe River
WS-V; Tr
[]This watershed has a TMDL
Discharge from this outfall is from:
❑• Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
0 Only during a rainfall event
❑ Intermittently (please Indicate how often)
❑ Continuously (please Indicate flow in CFS)
Latitude of outfall: 35"54'7.64"N
Longitude of outfall: 82" 2'3.95"W
Brief description of the industrial activities that drain to this outfall:
Stormwater from holding ponds
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑This water is impaired.
❑ This watershed has a TMDL
Discharge from this outfall is from:
❑ Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
[]Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is impaired.
❑This watershed has a TMDL
Discharge from this outfall is from:
❑ Stormwater []Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
Page 4 of 8
`*.'IV

All outfalls must be listed and at least one outfall is required. Additional outfalls may be added in the section
"Additional Outfalls" found on the last page of this N01.
8. Other Facility Conditions (check all that apply and explain accordingly):
\00
9.
S%U/
❑ This facility has any other NPDES permits. If checked, list the permit numbers for all current NPDES permits:
❑ This facility has Non -Discharge permits (e.g. recycle permit). If checked, list the permit numbers for all current Non -
Discharge permits:
(] This facility uses best management practices or structural stormwater control measures.
If checked, briefly describe the practices/measures and show on site diagram:
Retention basin to prevent sediment(parficulate matter from discharging to surface water. Hay bales as needed to hold back sediemnt
[]This facility has a Stormwater Pollution Prevention Plan (SWPPP).
If checked, please list date that SWPPP was implemented:
❑This facility stores hazardous waste stored in the 100-year floodplain.
If checked, describe how the area is protected from flooding:
❑ This facility is a (mark all that apply)
❑Hazardous Waste Generation Facility
❑Hazardous Waste Treatment Facility
❑ Hazardous Waste Storage Facility
❑ Hazardous Waste Disposal Facility
If checked, indicate:
Kilograms of waste generated each month:
Type(s) of waste:
How material is stored:
Where material is stored:
Number of waste shipments per year:
Name of transport/disposal vendor:
Transport/disposal vendor EPA ID:
Vendor address:
❑ This facility is located on a Brownfield or SUPERFUND site
If checked, briefly describe the site conditions:
❑ Facility provides appropriate secondary containment for bulk storage of liquid materials
If checked, briefly describe these measures:
❑ Site has an active landfill within the mining permit boundary
If checked, please indicate type:
a) ❑ LCID (Land clearing and Inert Debris)
b) []other (specify)
Required Items (Application will be returned unless all of the following items have been Included):
(] Check for $100 made payable to NCDEQ
❑ Copy of most recent Annual Report to the NC Secretary of State
ElThis completed application and any supporting documentation
❑ Copy of the approved mining permit or indication of mining permit application status
❑ Copy of US Army Corps — approved wetland delineation (if applicable)
Page 5 of 8

Line drawing of the water flow through the facility or block flow diagram
❑� Pictorial description of the nature of any sources of water and any collection and treatment measures
❑ A site diagram showing, at a minimum, existing and proposed:
a) outline of drainage areas
b) surface waters
c) stormwater management structures
d) location of stormwater outfalls corresponding to the drainage areas
e) runoff conveyance features
f) areas where materials are stored
g) impervious areas
h) site property lines
❑� 2 copies of large scale (24"x36" minimum) site plan showing:
a) topographical lines
b) all outfall locations
c) applicable buffers and delineated wetlands
d) receiving waters
e) 100-year flood plain (if applicable)
0 Copy of county map or USGS quad sheet with the location of the facility clearly marked
If mines site is in one of the 20 Coastal Counties (if applicable)
❑ Applicant has check with the appropriate regional office to verify the need for a Coastal State Stormwater permit.
a) Indicate the Regional Office Contact:
Detailed list of:
a) impervious surface areas and percentages
b) sub -drainage areas
c) total drainage area
If mine is dewatering and near wetlands, or may otherwise impact surface waters or groundwater (if
applicable)
0 2 copies of large scale (24"x36" minimum) plans delineating areas on the listing acreage including:
a) wetlands
b) ditches
c) well -placements
d) pits
e) borrow areas
f) overburden storage
g) stormwatercontrols/BMPs
h) vehicle maintenance areas
i) settling basins
j) product process (such as screening, stockpiles, and waste piles)
k) total drainage area
1) Impervious surface percentages (if state Stormwater programs apply)
m) applicable buffers
n) access and/or haul roads
❑ Pump dewatering size and Information on its specifications
❑ Well Information (design, depths, maintenance)
❑ Physical monitoring for the wetland areas
❑ Settling pond size information, if applicable
❑ Level spreader design, if applicable
❑ Details about dewatering method
❑ cone of influence calculations
Page 6 of 8
`�

l Description of measures to prevent erosion and flooding
❑ Description and information about 401/404 permits that have been obtained
❑ Copy of US Army Corps of Engineers wetlands delineations or approved wetland delineation (if applicable)
❑ I have contacted my local regional office about a Pumping Operation and Monitoring (POM) plan
a) Regional Office Contact:
b) Date Contacted:
10. Applicant Certification:
North Carolina General Statute 143-215.613 (1) provides that: Any person who knowingly makes any false statement,
representation, or certification in any application, record, report, plan, or other document filed or required to be maintained
under this Article or a rule implementing this Article ... shall be guilty of a Class 2 misdemeanor which may include a fine not
to exceed ten thousand dollars ($10,000).1 hereby request coverage under the referenced General Permit.
Under penalty of law, I certify that:
I am the person responsible for the permitted industrial activity, for satisfying the requirements of this permit, and for
any civil or criminal penalties incurred due to violations of this permit.
❑� The information submitted in this NO1 is, to the best of my knowledge and belief, true, accurate, and complete based on
my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the
information.
I will abide by all conditions of the NCG02 permit. I understand that coverage under this permit will constitute the
permit requirements for the discharge(s) and Is enforceable in the same manner as an individual permit.
❑� I hereby request coverage under the NCG020000 General Permit and understand that coverage under this permit will
constitute the permit requirements for the discharge(s) and is enforceable in the same manner as an individual permit.
Printed Name of Person Signing:
`o, Title:
C a _10/29/2021
(Signature of Applicant) (Date Signed)
Mail the entire package to: DEMLR—Stormwater Program
Department of Environmental Quality
512 N. Salisbury Street, Vh floor
1612 Mail Service Center
Raleigh, NC 27699-1612
Page 7 of 8

Additional Outfalls
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is on the 303(d) list.
❑ This watershed has a TM DL.
Discharge from this outfall is from:
❑Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is on the 303(d) list.
❑ This watershed has a TMDL
Discharge from this outfall is from:
❑ stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
❑ Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged overthe calendar year?
3-4 digit identifier:
Name of receiving water:
Classification:
❑ This water is on the 303(d) list.
❑This watershed has a TMDL
Discharge from this outfall Is from:
❑Stormwater ❑ Mine Dewatering ❑ Process Wastewater
Discharge occurs from this outfall:
❑ Only during a rainfall event
❑ Intermittently (please indicate how often)
[]Continuously (please indicate flow in CFS)
Latitude of outfall:
Longitude of outfall:
Brief description of the industrial activities that drain to this outfall:
Do Vehicle Maintenance Activities occur in the drainage are of this outfall? ❑ Yes ❑ No
If yes, how many gallons of new motor oil are used each month when averaged over the calendar year?
Page 8 of 8
U

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Section 2
Figures (D-Sized Plan Sheets)

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BUECHEL STONE CORPORATION
STEEL GRAY MINE
SPRUCE PINE, NORTH CAROLINA
SITE LOCATION MAP
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LEGEND:
— — — — — — PERMIT BOUNDARY
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MAX CLEARING LIMITS
(5.67 ACRES)
FEMA FLOOD HAZARD LIMIT
I'VED
MAR 3 1 2011
LAND QUALITY
MINING PROGRAM
SOURCE
1. BASEMAP COORDINATE SPACE IS NORTH CAROLINA STATE
PLANE, NAD83 (NC83F).
2. PARCEL DATA PROVIDED BY MITCHELL COUNTY, NC83F,
PUBLISHED APRIL 2021.
3. SURVEY FILE PROVIDED BY MOUNTAINEER LAND SURVEYING.
4. AERIAL PROVIDED BY 2021 MICROSOFT CORPORATION,
DISTRIBUTION AIRBUS DS 2021.
0 100, 200'
GRAPHIC SCALE

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MAR 31 1011
GRAPHIC SCALE LAND QUALITY
MINING PROGRAM

Section 3
Attachment 1:
• Details of Erosion and Stormwater Management Features
• Stormwater Calculation

r..,
Attachment 2
Stormwater and Erosion Control Calculations
RECEIVED
MAR 3 12022
LAND QUALITY
MINING PROGRAM

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Figure 6.62a Installation detail of a sediment fence
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Steel Gray Mine
Sediment Trap
Trap /
Skimmer Size Drainage Area
Surface Storage Spillway
Area Volume length
T-1
16'X60'X4
0.6 acres
960ft2
3840ft3
4.0'
T-IA
10'X33'X4'
0.12 acres
330ftz
1320ft3
4.0'
T-2
20'x110'x4'
1.87 acres
2200ft2
8800ft3
6.0'
T-3
26'x100'x3'
2.12 acres
2600ftz
10400ft3
6.0'
T-4
36'x125'x4'
3.5 acres
4500ft2
18000ft3
10.0'
T-5
36'x99'x4'
1.95 acres
3564ft2
14256ft3
9.54

Runoff Calculations for Trap T-1
rlascrintinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.6
0.5
0.3
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
Totals 0.6 0.3
C = 0.3 (coef) / 0.6 (acres) = 0.5
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.5 X 7.06 X 0.6 = 2.118 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.5 X 5.21 X 0.6 = 1.563 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.5 X 8.09 X 0.6 = 2.427 cfs

llww� lqwv
Sediment Trap Trap T 1
Trapping Effeclency
Drainage Area Acres 0.6
A = 0.01 X (0) 1 2.118 = 0.0212 X 43560 922.E M Required
Basin Size 16'X60 M(minimu n)
Ft2 Surface area 960
Ft3 Storage area 3840
Trap to be deaned at the plont where the basin no longer funclions well or Is at 50% capadty.
\„�

Runoff Calculations for Trap T-1A
Description
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.21
0.5
0.105
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
t otals U.21 U.1 Ub
C = 0.105 (coef) / 0.21 (acres) = 0.5
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.5 X 7.06 X 0.21 = 0.7413 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.5 X 5.21 X 0.21 = 0.54705 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.5 X 8.09 X 0.21 = 0.84945 cfs

M
m
Sediment Trap Trap T 1A
Trapping Effeciency
Drainage Area Acres 0.21
A = 0.01 X (0) 0.74 = 0.0074 X 43560 =1 322.3 fl2 Required
Basin Size 10'X3TXC(mtnimum)
Ft2 Surface area 330
Ft3 Storage area 1320
Trap to be deaned at the piont where the basin no longer functions well or Is at 50% c apadty.
\4WOO/

Runoff Calculations for Trap T-2
flacrrintinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.75
0.5
0.375
Grassland & disturbed Areas
0
0.5
0
Woodlands
1.12
0.3
0.336
Roadway ravel
0
0.65
0
Totals 1.87 0.711
C = 0.711 (coef) / 1.87 (acres) = 0.3802139
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.38021 X 7.06 X 1.87 = 5.01966 cfs
i = Rainfall Intensity for 2 yea( 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.38021 X 5.21 X 1.87 = 3.70431 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.38021 X 8.09 X 1.87 = 5,75199 cfs

\00
�.d Sediment Trap
EM-3
Trap T 2
Trapping Effeciency
Drainage Area Acres 1.87
A = 0.01 X (0) 5.02 = 0.0502 X 43660
Basin Size 2VX1 I UM(minimum)
Fit Surface area 2200
Ft3 Storage area 8800
2186.7 ft2 Required
Trap to be cleaned at the plont where the basin no longer functions well or is at 50% capacity.

Runoff Calculations for Culvert C-1
nimgn.rinfinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.85
0.7
0.595
Grassland & disturbed Areas
0
0.5
0
Woodlands
1.12
0.3
0.336
Roadway ravel
0
0.65
0
Totals 1.97 0.931
C = 0.931 (coef) 1 1.97 (acres) = 0.4725888
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.47259 X 7.06 X 1.97 = 6.57286 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.47259 X 5.21 X 1.97 = 4.85051 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.47259 X 8.09 X 1.97 = 7.53179 cfs

\11111110,
Project Description
Worksheet
Circular Channel - C-1
Flow Element
Circular Channel
Method
Manning's Formula
Solve For
Channel Depth
Input Data
Mannings Coefficient
0.010
Slope
0.010000 Rift
Diameter
15 In
Discharge
7.53 cis
Results
Depth
0.92 ft
Flow Area
1.0 fr
Wetted Perimeter
2.59 ft
Top Width
1.10 ft
Critical Depth
1.09 ft
Percent Full
73.9 %
Critical Slope
0.007304 Rift
Velocity
7.74 ftfs
Velocity Head
0.93 ft
Specific Energy
1.86 ft
Froude Number
1.45
Maximum Discharge
9.03 cis
Discharge Full
8.40 cis
Slope Full
0.008041 Rift
Flow Type
Supercritical
� tb to
0.92 It I
lI
V:t�
H:1
NTS
`44

Runoff Calculations for Ditch DB-2
nescrintinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.6
0.7
0.42
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
Totals 0.6 0.42
C = 0.42 (coef) / 0.6 (acres) = 0.7
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.7 X 7.06 X 0.6 = 2.9652 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.7 X 5.21 X 0.6 = 2.1882 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.7 X 8.09 X 0.6 = 3.3978 cfs

M
Project Description
Worksheet Trapezoidal Channel - DB-2
Flow Element Trapezoidal Channel
Method Manninjs Formula
Solve For Channel Depth
Input Data
Mannings
0.104
Coefficient
Slope
0.020000 ftlft
Left Side Slope
2.00 V : H
Right Side Slope
2.00 V : H
Bottom Width
2.00 ft
Discharge
3.39 cfs
Results
Depth
0.97 ft
Flow Area
2.4 fN
Wetted Perimeter
4.17 ft
Top Width
2.97 ft
Critical Depth
0.43 ft
Critical Slope
0.280312 ft/ft
Velocity
1.40 ft/s
Velocity Head
0.03 ft
Specific Energy
1.00 ft
Froude Number
0.27
Flow Type
Subcdflcal
Determine sheer stress: T= 62.4X 0.97 X 0.02 s 1.21 IbV Permissible Sheer Stress 4.0 IMF Rip Rap Lining OK
0.87 k
-2.00
V:1
H2.0
NTS
`4.

Runoff Calculations for Ditch DB-2A
r)escrintinn
Acres C-Value Coef.
Bare Sandy Soil level
0
0.5
0
Bare Soil (sloping)
0.24
0.7
0.168
Grassland & disturbed Areas
0
0.5
0
Woodlands
0
0.3
0
Roadway ravel
0
0.65
0
Totals 0.24 0.168
C = 0.168 (coef) / 0.24 (acres) = 0.7
i = Rainfall Intensity for 10 year, 1 day storm = 7.06 inches
Q = (C)(i)(A) = 0.7 X 7.06 X 0.24 = 1.18608 cfs
i = Rainfall Intensity for 2 year, 1 day storm = 5.21 inches
Q = (C)(i)(A) = 0.7 X 5.21 X 0.24 = 0.87528 cfs
i = Rainfall Intensity for 25 year, 1 day storm = 8.09 inches
Q = (C)(i)(A) = 0.7 X 8.09 X 0.24 = 1.35912 cfs

\whov
\VAFi
Project Description
Worksheet
Trapezoidal Channel - DB-2A
Flow Element
Trapezoidal Channel
Method
Manning's Formula
Solve For
Channel Depth
Input Data
Mannings Coefficient
0.104
Slope
0.020000 ft1ft
Left Side Slope
2.00 V : H
Right Side Slope
2.00 V : H
Bottom Width
2.00 ft
Discharge
1.36 cfs
Results
Depth
0.66 ft
Flow Area
1.3 ftz
Wetted Perimeter
3.24 ft
Top Width
2.55 ft
Critical Depth
0.24 ft
Critical Slope
0.305306 ft/ft
Velocity
1.08 ft/8
Velocity Head
0.02 ft
Specific Energy
0.57 ft
Froude Number
0.27
Flow Type
Subcritical
Determine sheer stress: T= 62.0 0.66 X 0.02 0 0.69bW Permissible Sheer Stress 4.0 IMP Rip Rap Uning OK
0.55 ft
.._i-
VAN
H2.0
HTs