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DIVERSION DITCH CALCULATIONS
DIVERSION
DITCH ID
BOTTOM
WIDTH (FT)
DEPTH (FT)
TOP WIDTH (FT)
SIDE SLOPES
(V:H)
SLOPE (%)
LENGTH (FT)
DRAINAGE
AREA (AC)
Q10 (CFS)
LINING TYPE
FLOW
VELOCITY (FT/S)
TD-1
2.0
1.5
11.0
3:1
0.55%
123
0.24
0.45
BARE
1.22
TD-2
2.0
1.5
11.0
3:1
0.75%
146
0.24
0.45
BARE
1.45
TD-3
2.0
1.5
11.0
3:1
2.75%
189
0.24
0.45
JUTE
1.96
TD-4
2.0
1.5
11.0
3:1
5.50%
124
0.20
0.37
JUTE
2.39
DRAINAGE AREA MAP
(NOT TO SCALE)
Residential Construction Sequence
I � �
LOGBRIDGE
RD.
SITE
� I
\ SCOTT
RIDGE I
\ DRIVE -
-1 I
I
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VICINITY MAP
(NOT TO SCALE)
EROSION CONTROL LEGEND
• SILT FENCE OUTLET
SF SILT FENCE
TP TREE PROTECTION
>To TEMPORARY DIVERSION DITCH
LD LIMITS OF DISTURBANCE
WOODED AREA
I WATTLE
■ CONCRETE WASHOUT
1. Submit a Land Disturbing Permit Application at least 30 days prior to any land disturbing activity occurring.
2. Organize pre -construction meeting with Chatham County Watershed Protection Department to review site plan prior to land disturbing activities. Land -Disturbing Permit and Approved Plans will be
provided at this meeting.
3. Install all temporary erosion control measures according to the information discussed during the pre -construction meeting. Minimal clearing may occur in the immediate area of all measures to provide
for installation.
4. Permitted land disturbing activities may begin once measures are installed.
5. Complete self -inspections weekly and within 24 hours or a 0.5" or greater rainfall event.
6. Maintain all erosion and sediment control measures in good working order. Silt fence, inlet protection and other similar measures must be cleaned out when they are half full. Clogged silt fence outlets
must be refreshed/replaced. Silt fence cannot have holes or tears.
7. Ground cover shall be provided as follows:
7.1. Stabilize basins with ground cover immediately after installation. (If applicable)
7.2. Stabilize diversion ditches intended to be in service for 14 days or more with temporary seeding and erosion control matting. If applicable)
( ) Y p rY 9 9 ( pp )
7.3. For all areas of moderate and/or steep slopes, stabilize area with seed and matting if the slope has not been disturbed for a period of (7) days.
7.4. Provide ground cover sufficient to restrain erosion on any portion of the site upon which further land -disturbing activity is not being undertaken within (14) calendar days of temporarily or
permanently suspending land disturbing activity.
7.5. Establish permanent ground cover sufficient to restrain erosion immediately following completion of construction or development and/or prior to final inspection.
8. Re -install adequate erosion and sediment control measures and/or increase maintenance frequency where approved measures fail to prevent accelerated erosion, off -site sedimentation, or repetitive
non-compliance issues.
9. Modifications to the approved and permitted plans shall be approved, by Chatham County Watershed Protection Department staff only, prior to removal or installation. Contact Chatham County
Watershed Protection Department staff to request an inspection and obtain a sign -off on the plans or an approved Field Revision.
10. Once grading and construction activities are complete, temporary measures are removed, and the site is stabilized call Chatham County Watershed Protection Division staff to schedule the final
inspection.
11. Once the final inspection is complete the permit will be closed and no additional ground disturbing activities can occur.
NCDENR Self -Inspection Program
The sedimentation pollution control act was amended in 2006 to require that persons responsible for land -disturbing activities inspect a project after each phase of the project to make sure that the approved
erosion and sedimentation control plan is being followed.
Rules detailing the documentation of these inspections take effect October 1, 2010.
The self -inspection program is separate from the weekly self -monitoring program of NPDES stormwater permit for construction activities. The focus of the self -inspection report is the installation and
maintenance of erosion and sedimentation control measures according to the approved plan. The inspections should be conducted after each phase of the project, and continued until permanent ground
is established.
The self -inspection report form is available as a excel spreadhseet from the land quality web site,
http://portal. ncdenr. org/webAr/erosion
NOTES:
1. The property lies in zones "X" and "AE" per national flood insurance program flood insurance rate map community number 3710976500k dated 11/17/2017.
2. All distances are horizontal ground distances and all bearings are based on GPS observation, NAD 83 / NSRS 2011 / SPC unless otherwise shown.
3. Site zoned "r-1" per Chatham county GIS.
4. Zone R1 building setbacks per Chatham county UDO:
Front:40' Side: 25' Rear: 25'
5. Areas computed by coordinate method.
6. This survey was prepared by Bateman civil survey company, under the supervision of Steven P. Carson, PLS.
7. Survey performed without the benefit of a title report.
8. This map has not been reviewed by a local government agency for compliance with any applicable land development regulations.
9. No investigation into the existence of jurisdictional wetlands or riparian buffers performed by this firm.
10. Property owner: Shenandoah Homes, LLC.
3724 National Drive, STE. 215
Raleigh, NC 27612
11. Contours shown on this plan were taken from the Chatham County GIS Website.
12. The proposed lot will comply with Chatham County Stormwater Ordinance by adhering to Article 4 Section 400(5)(d)(ii). See Appendix C for Guidelines.
13. During utility trenching in Scott Ridge Drive the spoils must be placed on the higher side of the utility trench. Immediate stabilization will be required after the completion of the utility installation.
14. The proposed grading will match existing contours closely to limit earthwork.
15. Development of redevelopment of a minor subdivision of an individual residential lot cumulatively exceeding 20,000 square feet of land disturbance shall comply with Section 165.045(E)(D) and (E)
[Formerly section 400(5)(D) and (E)] of Chatham Count Stormwater Ordinance
APPENDIX C:
SINGLE-FAMILY RESIDENTIAL LOT GUIDELINES FOR STORMWATER MANAGEMENT
The practices below are required for better lot design with regard to managing stormwater runoff from single-family residential uses. Chatham County requires
the use of one or more of these practices to reduce total runoff quantity and quality from a lot. It also serves to limit negative impacts to downstream or
off -site property in terms of scour, sedimentation, flooding or other potential damages.
Single Family Residential Lots
• All roof downspouts shall discharge onto the surface of the natural ground at -least 25 feet from the property boundary and in accordance with all applicable
Buildinq Codes. 0
NOTE: SILT FENCE LINE
HAS BEEN OFFSET FROM
LIMITS OF DISTURBANCE
FOR PLAN LEGIBILITY
NORTH
50 0 25 50 100
SCALE: 1 inch = 50 ft.
PRELIMINARY DRAWING
NOT FOR CONSTRUCTION
E)
SHENANDOAH
Hr, m GS
Shenandoah Homes, LLC
Residential Developer / Land Development
NCBELS Firm License #D-0428
Raleigh, NC 27612 Phone: [phone]
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OWNER:
SHENANDOAH HOMES, LLC.
3724 NATIONAL DR.
STE. 215
RALEIGH, NC 27612
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FARO
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ON Y E M
02-01-2023
APPROVED:
AEM
PROJECT:
DL-2023-E
CHECKED:
AEM
SCALE:
1" = 50'
DESIGNED:
CHG
RELEASE:
02-02-2023
SHEET
LIMITS OF DISTURBANCE: 3.95 AC
PURPOSES.
EC-
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