SW6240703_Stormwater Report_20240724

STORMWATER CALCULATIONS
AND SUPPORTING DATA
Magnolia Hill Apartments
Carthage, North Carolina
SEAL :••
056498
Prepared by:
Engineering
Landscape Architecture
Planning
r
140 Aqua Shed Court
Aberdeen, NC 28315
License # P-1095
June, 2024

STORMWATER ANALYSIS NARRATIVE
MAGNOLIA HILL APARTMENTS
MOORE COUNTY, CARTHAGE
Prepared by:
n Engineering
Landscape Architecture
`� Planning
r
140 Aqua Shed Court
Aberdeen, NC 28315
License # P-1095
June, 2024

Stormwater Analysis Narrative Magnolia Hill Apartments,Carthage NC
Stormwater Narrative
The proposed project is located 0.12 miles North of the intersection of McCaskill Rd. and NC
22Hwy in Carthage, North Carolina. The site is a 23.57 acre parcel that was previously a natural
wooded area with slopes ranging from 2-15%. Southern Pines Apartment Managers, LLC recently
purchased the property with the intent of developing 10 new apartment buildings with
amenities. The site is located in the Cape Fear River Basin and drains to Little River with stream
index number 8-23-(1) and classification WS-III;HQW, thus requiring a State Stormwater Permit.
About 17.91 of the 23.57 acres will be disturbed during construction. We're using bioretention
ponds to treat the first inch while also sizing them to meet the Town's 10-year pre/post
stormwater requirement. Stormwater runoff generated from impervious surfaces and other
portions of the site will be directed to catch basins and inlets strategically placed at low points
throughout the site. Runoff will then be conveyed to the bioretention ponds via the storm pipe
network. The volume of runoff for the first inch was derived using the Simple Method equation
for each pond.The volumes were calculated to be 13,149 cubic feet for pond#1 and 15,101 cubic
feet for pond #2 (see calculations below). The runoff from the first inch will infiltrate at
approximately one inch/hour through the engineered media to the perforated underdrains
located 3 feet below the planted surface. From there the treated water will be directed to the
outlet structure and discharged through the outlet pipe. Using stage storage calculations, 6-inch
orifices have been set on the riser structures just above the treatment volume elevation to allow
for increased discharge which satisfies the 10-year pre/post requirement (see the attached stage
storage charts).
Orifice Calculations
Pond #1 orifice is set at 378', pond volume at 378' is 13,410 cubic feet, required treatment
volume for pond #1 is 13,149 cubic feet
Pond #2 orifice is set at 378', pond volume at 378' is 15,178 cubic feet, required treatment
volume for pond #2 is 15,101 cubic feet
Page 2 of 3

Stormwater Analysis Narrative Magnolia Hill Apartments,Carthage NC
Simple Method Calculations
The Below excerpt is from chapter 3 of the NCDENR Stormwater BMP Manual
3.3.1. Simple Method The Simple Method uses a minimal amount of information such as
watershed drainage area, impervious area, and design storm depth to estimate the volume
of runoff. The Simple Method was developed by measuring the runoff from many watersheds
with known impervious areas and curve-fitting a relationship between the percent
imperviousness and the fraction of rainfall converted to runoff (the runoff coefficient). This
relationship is presented below:
RV = 0.05 +0.9 * IA
Where: RV = Runoff coefficient [storm runoff (in)/storm rainfall (in)], unitless
IA = Impervious fraction [impervious portion of drainage area (ac)/ drainage area (ac)],
unitless.
Once the runoff coefficient is determined, the volume of runoff that must be controlled is
given by the equation below:
V = 3630 * RD * Rv * A
Where: V = Volume of runoff that must be controlled for the design storm (ft3)
RD = Design storm rainfall depth (in) (Typically, 1.0" or 1.5")
A = Watershed area (ac)
Page 3 of 3

Magnolia Hill Apartments
Carthage, North Carolina
Bioretention Pond #1

Bioretention Area DATE
August,2023
PROJECT NAME PROJECT NO.
Magnolia Hill Apartments Spam-23.01
11_0,KE-c LOCATION BY
Carthage,North Carolina TDB
CHECKED BY
Bioretention Pond#1
PAP
Basin Design Criteria
Impervious Grass Forrest
Description Total Area(sf) Area(AC) area 1 CN1 area 2 CN 2 area 3 CN 3 CN
Pre Devel. 249,177.64 5.72 - 98 249,178 39.0 - 55 39.0
Post Devel. 249,177.64 5.72 161,476 98 87,701 39.0 - 55 77.2
SCS Runoff(IN)From IN Rain SCS Volume RO(CF) RO VOL(cf)= RO from 1"
la (%Imp) Rd Rv S 1 5.7 1 5.7 1 VOL(cf)=
0.000 1 0.050 1,038
0.648 1 0.633 13,149
Runoff to treat from new impervious area=l 13,1491
Impervious Grass Forrest
Description Total Area(sf) Area(AC) area 1 C area 2 C area 3 C C
Pre Devel. 249,177.64 5.72 - 0.90 249,178 0.20 - 0.20 0.20
Post Devel. 249,177.64 5.72 161,476 0.90 87,701 0.20 - 0.20 0.65

Bioretention Area DATE
August,2023
PROJECT NAME PROJECT NO.
Magnolia Hill Apartments Spam-23.01
11_0,KE-c LOCATION BY
Carthage,North Carolina TDB
CHECKED BY
Bioretention Pond#1
PAP
Hydrograph formulation-Pre-Construction
Contour Area Incr.Vol. Accum.Vol. Stage Zest
(ft) (sf) (ft^3) (ft^3) (ft) (ft) 4th Order Polynomial
376.00 0 0.00 0 0.00 0.35 Coefficients
376.50 0 0.00 0 0.50 0.35 b 3.545E-01
377.00 9,983 2,495.75 2,496 1.00 0.75 c1 1.668E-04
377.50 10,915 5,224.38 7,720 1.50 1.44 c2 -3.737E-09
378.00 11,846 5,690.13 13,410 2.00 2.05 c3 5.818E-14
378.50 12,649 6,123.75 19,534 2.50 2.57 c4 -3.300E-19
379.00 13,452 6,525.25 26,059 3.00 3.04
379.50 14,380 6,957.89 33,017 3.50 3.49
380.00 15,307 7,421.68 40,439 4.00 3.95
380.50 16,544 7,962.69 48,402 4.50 4.46
381.00 17,780 8,580.93 56,982 5.00 5.01
381.50 19,029 9,202.31 66,185 5.50 5.56
382.00 20,278 9,826.85 76,012 6.00 5.97
382.50 0 5,069.56 0 6.50 0.35
383.00 0 0.00 0 7.00 0.35
383.50 0 0.00 0 7.50 0.35
384.00 0 0.00 0 8.00 0.35
384.50 0 0.00 0 8.50 0.35
385.00 111 0 0.00 0 9.00 0.35
Volume at 378'=13,410 cubic feet

Magnolia Hill Apartments
Carthage, North Carolina
Bioretention Pond #2

Bioretention Area DATE
August,2023
PROJECT NAME PROJECT NO.
Magnolia Hill Apartments Spam-23.01
11_0,KE-c LOCATION BY
Carthage,North Carolina TDB
CHECKED BY
Bioretention Pond#2
PAP
Basin Design Criteria
Impervious Grass Forrest
Description Total Area(sf) Area(AC) area 1 CN1 area 2 CN 2 area 3 CN 3 CN
Pre Devel. 323,546.89 7.43 - 98 323,547 39.0 - 55 39.0
Post Devel. 323,546.89 7.43 183,373 98 140,174 39.0 - 55 72.4
SCS Runoff(IN)From IN Rain SCS Volume RO(CF) RO VOL(cf)= RO from 1"
la (%Imp) Rd Rv S 1 5.7 1 5.7 1 VOL(cf)=
0.000 1 0.050 1,348
0.567 1 0.560 15,101
Runoff to treat from new impervious area=l 15,1011
Impervious Grass Forrest
Description Total Area(sf) Area(AC) area 1 C area 2 C area 3 C C
Pre Devel. 323,546.89 7.43 - 0.90 323,547 0.20 - 0.20 0.20
Post Devel. 323,546.89 7.43 183,373 0.90 140,174 0.20 - 0.20 0.60

Bioretention Area DATE
August,2023
PROJECT NAME PROJECT NO.
Magnolia Hill Apartments Spam-23.01
11_0,KE-c LOCATION BY
Carthage,North Carolina TDB
CHECKED BY
Bioretention Pond#2
PAP
Hydrograph formulation-Pre-Construction
Contour Area Incr.Vol. Accum.Vol. Stage Zest
(ft) (sf) (ft^3) (ft^3) (ft) (ft) 4th Order Polynomial
376.00 0 0.00 0 0.00 0.36 Coefficients
376.50 0 0.00 0 0.50 0.36 b 3.642E-01
377.00 10,488 2,622.00 2,622 1.00 0.74 c1 1.514E-04
377.50 12,556 5,760.97 8,383 1.50 1.43 c2 -3.318E-09
378.00 14,624 6,794.92 15,178 2.00 2.05 c3 4.766E-14
378.50 15,360 7,495.87 22,674 2.50 2.58 c4 -2.409E-19
379.00 16,096 7,863.83 30,538 3.00 3.04
379.50 16,843 8,234.57 38,772 3.50 3.48
380.00 17,590 8,608.08 47,380 4.00 3.94
380.50 18,349 8,984.75 56,365 4.50 4.46
381.00 19,109 9,364.55 65,730 5.00 5.02
381.50 19,881 9,747.51 75,477 5.50 5.56
382.00 20,653 J 10,133.61 85,611 6.00 5.97
382.50 0 5,163.33 0 6.50 0.36
383.00 0 0.00 0 7.00 0.36
383.50 0 0.00 0 7.50 0.36
384.00 0 0.00 0 8.00 0.36
384.50 0 0.00 0 8.50 0.36
385.00 111 0 0.00 0 9.00 0.36
Volume at 378'=15,178 cubic feet

Magnolia Hill Apartments
Carthage, North Carolina
Drainage Area Map

/ 1-\\''''/ \\I i4 -\\\ \A\ —\ \ \\\'���` N.
\ � \\_/\ / \, _1 /11 I REVISIONS ....n.. •
�I \ \ \\��` _� �� DESCRIPTION IDATE BY\ \ \ N. • •.
\S . � ; % / Ji ,� \ \ \ / \ � \ //i \ �_ . . . , �� Iyr \ \\\ \ \ \ l \ �) • , . � �....
/ 1 1 // � /_ . / 1i
/ \�I � \ , \ \ \ \ \ \ I \ \ <� \\ j f1 �\ �\\ \ /
1 I ' 1 \ \\ \ \ \ \\ \ \\ \ \ ' . =/ � . • 7� / I/ \ — /// I �in I�l0� �o � 000t� T
•
iyl/I l \ VA \\\ \ V\\\\V\AAV\ \ / /I 14 �\ \ \\ \ \ \ I r� r � \_ —/ // � Il/ 1 Cm
� � � 7jr1�\.� --/ /� 1 v�� a^ oo Z
ro\ 'A" \\\\\\\\\ \ \ \ \ \ � /\ , 7/ //� Ol7vCQlO7\ \ I
\-.N.-\.\ ' )`' �\\ \ ,\\\ A i��� \ --,-.1.:. � 315 �j/-/j��\ 'O ,
1 ' \ \\\V \\\VA � —/,„j% le w ., / i
O, J
N
4-1 / ...,N._1—
l
\h� /� /y- \\ \ \\\\ \ --� - ---J� l\ \ / \_ ��j 325/// // I I
VI \ \\\\ - — �\ \Z.> =�— /��// 3i%ii/�= 1 CU L. ate,
\�\\kI?1j; ��\\\�\�\�\���_--_ �—_ - � __-,/�� cy �/� ^\\ ' \_ a
vA \ \ \ —mot1_— - �� i�/ii�tb/z ��\ c
\`1'\ I 1 -�� \�� __,-_- _ %%%�'=—i �//�� tip=
'1 �\\\�/ii — /%mil /� i36%//�\� �� J
`f\II �\ �/'n 1 �.. ' \\\r�r 3-4 — /�, 1 BMP-2 //3 "\\ /
\IIII 1 /' \ \� r�L�� 3- 4 !DA: 7.42 ACS. j%i \ 1\\ // 1
�IuII I 44 l l�=\_\�1L��\lJZ 350_�� - 3$0��
\ I� I 1 —` ��= \\ \�\��\\ // i / 3so ro`0°/y���� �—r \ +Y� zl i 1
....9
—1\ \ NX -4,1-- ------='------ ----- , . , .
____T\,\'\ \ ,) i„i! . ,If-,-•---,---:--±____. '- --,2----_-_-_-_-_-__6 5-,--, _-__-------±-------__------_-_-_,_----------- ; kl ..?. t , 7 ? - ---,‘-,.___,_._ ,N,--_ , 1
111\'\\P /: , , -j; ,:" --__---- --__
\ II\
�I
A�1111�IVIIII�1� � % I � Avv�% i/i�. 'y� % , 3��' �, 1
II 1 6 �I ���� BMPliA\..„!„..004N
\V� /////-� TM
II/ //�--' -37._DA: 2ACS. �� //j/��1 ' 11 ( ems. ���///,oa I 392 — i 1
III 11, I V II II ---- v� //i -.' 1 :',"\138','
�� �"
II 11 I II� l\� "' � \\� �/j/777.71
8B ��m
1 1 1 A �.s� \ _— 380\ \\\\_��- // //. 13g '', —390 d1 \� � / / 388 ... -�,..�J I ' z1� 11�1 I j� � - �..',I////JIB,�,) 'j i \0 . _\ _ _u �% 0 Q
I / l 1' II\I > �.ni, - -�0116-: T �� _�1 ��3gj i� � O. ` /' _ ` I IJ ce
4 1/ /// hf, 1 i VI / cC� .� �� / rei\' \\ \} LAB M—I k 1 IOa i I I III l' I, E� ,irl /�L ��j ; /� 389 ; \\ �•�I +MI � wa y/' %" �a�i 1111 I�I�� (I I ®"� �i , I 4 /3g6 � iiii % ®I ;--'a _ • "°M'1 I Q
fitI �1I 1."I s e" - e a� �� — Z
11 )_ _ eh---0�- ,_ —s j� �9ti WtrI Q
/ I
11 I��— C�� �� ,���✓ av� ,�► • — /
� E 9
/ — Imo— I, K 1` I 6 8 a/ .11.4)ti �� \ \ s 1: i‘ ' 141 • _ ov.----k,r \E NI, .-8-8. . Ii. 0 _..\\‘, bis,lc / . '' 'ate/ W�
1
G `
7 � \' R Y �,d sue" 9� `ter -9. /y�/ J m
1.\,\�` Z `° yq;, B 9P J\ �..,,i'i„°" �r� ° / yr' /
I yee3e r 3a. s �j s" i w s / �. / //�� / H o
\\\ \ I I \ 1''III+ I . •� sip,,*. i % -�,� 3\° , �'W% c / / / I Q cw
\ \\ �\\ III n 8a\ ��` 388 /I ��/� 38B /�388 / ai
II '� 0� J 388 /" af• / Q
I A
a /` c
1 \ J ill I� I ' '/ 4�s°***" 1 .-� �`/ �_, jI / / G U
1 \ \\\ IIII\ \ 9i�9 , \ 3g/ �s�
\ I ,ter 1vivo
\ F
'S'
e \\ 'I� \\'III •I n I �� ^/ � /
E \ ) ) II ,y ,,III,' ) I ` ,/ -""
\ Ir, I y o /" / i o . ea ,eo
I \ 1 11\\ '' I I -/''� / I I I DATE: March,2023
I I IL\ \\ I >-
fly8 9ti //� %// /g ' — / \ GRAPHIC SCALE
FULL 512E SHEET 22"x34
(IN FEET) DESIGNED: JDM
iA I \ % _ _ DRAWN: JDM
vI %� 1! � CHECKED'�.I _ _
_
m //.

Magnolia Hill Apartments
Carthage, North Carolina
Storm Pipe and Culvert
Calculations

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 PRELIM / /
L PROJECT NAME PROJECT NO CONSTR /X/
Magnolia Hill Apartments Spam-23.01 REVISION %/
LOCATION BY RECORD / /
Carthage,North Carolina FDW OTHER / //
CHECKED BY (SPECIFY)
TAC
n= 0.013 STORM DRAINAGE SCHEDULE CONTINUED -k
9= 210
h= 21
INLET Tc I Cc
INLET INLET Cc INLET TOTAL INLET PIPE TIME RUNOFF
FROM TO AREAS AREA AREA Soils Impervious RUNOFF DISCHARGE AREAS TIME TIME OF CONC. INTENSITY COEFF.
(INLETS) (SF) (AC) )%) )%) COEFF. (CFS) (AC) (MIN) (MIN) (MIN) (IN/HR)
CI-01 FES-02 1 8013.85 0.18 0.45 0.55 0.61 0.90 0.18 5.00 0.00 5.00 8.02 0.61
CI-3 CI-4 3 5467.52 0.13 0.15 0.85 0.84 0.84 0.126 5.00 0.00 5.00 8.02 0.84
CI-4 CI-5 3-4 10127.69 0.23 0.15 0.85 0.84 1.56 0.358 5.00 0.17 5.17 7.96 0.84
CI-5 CI-6 3-5 7325.31 0.17 0.10 0.90 0.88 1.18 0.526 5.00 0.31 5.31 7.92 0.85
CI-6 CI-7 3-6 4895.34 0.11 0.15 0.85 0.84 0.75 0.639 5.00 0.44 5.44 7.88 0.85
CI-7 CI-8 3-7 9799.59 0.22 0.20 0.80 0.80 1.44 0.864 5.00 0.74 5.74 7.80 0.84
CI-8 CI-9 3-8 3577.10 0.08 0.27 0.73 0.75 0.49 0.946 5.00 0.88 5.88 7.76 0.83
CI-9 CI-10 3-9 5353.33 0.12 0.19 0.81 0.81 0.80 1.069 5.00 1.14 6.14 7.68 0.83
CI-10 CI-11F 3-10 34217.39 0.79 0.18 0.82 0.82 5.13 1.854 5.00 1.68 6.68 7.53 0.82
CI-11F CI-11 3-11 118.65 0.00 0.09 0.91 0.88 0.02 1.857 5.00 1.89 6.89 7.47 0.82
CI-11 CI-12 3-11F 17782.46 0.41 0.23 0.77 0.78 2.54 2.265 5.00 2.12 7.12 7.41 0.81
CI-12 CI-13 3-12 8962.04 0.21 0.25 0.75 0.76 1.26 2.471 5.00 2.32 7.32 7.36 0.81
CI-13 FES-14 3-13 4541.03 0.10 0.00 1.00 0.95 0.79 2.575 6.00 2.55 7.55 7.31 0.81
GI-11A GI-11B 11A 5502.95 0.13 0.10 0.90 0.88 0.89 0.126 5.00 0.00 5.00 8.02 0.88
GI-11B GI-11C 11A-11B 22371.71 0.51 0.70 0.30 0.43 1.75 0.640 5.00 0.56 5.56 7.85 0.51
GI-11C CI-11C2 11A-11C 5352.18 0.12 0.50 0.50 0.58 0.57 0.763 5.00 0.83 5.83 7.77 0.52
CI-11C2 CI-11D 11A-11C2 7513.01 0.17 0.15 0.85 0.84 1.16 0.935 5.00 1.11 6.11 7.69 0.58
CI-11D CI-11 11A-11D 1509.72 0.03 0.10 0.90 0.88 0.24 0.970 6.00 1.17 6.17 7.67 0.59
CI-09A CI-09B 09A 23856.77 0.55 0.22 0.78 0.79 3.45 0.548 5.00 0.00 5.00 8.02 0.79
CI-09B CI-09C 09A-09B 4664.81 0.11 0.31 0.69 0.72 0.62 0.655 5.00 0.63 5.63 7.83 0.77
CI-09C CI-09 09A-09C 910.09 0.02 0.00 1.00 0.95 0.16 0.676 5.00 0.85 5.85 7.76 0.78
01-11C1 GI-11C2 11C1 6895.51 0.16 0.15 0.85 0.84 1.06 0.158 5.00 0.00 5.00 8.02 0.84
CI-11E CI-11F 11E 19979.26 0.46 0.27 0.73 0.75 2.75 0.459 5.00 0.00 5.00 8.02 0.75
CI-15 CI-16 15 6649.84 0.15 0.15 0.85 0.84 1.02 0.153 5.00 0.00 5.00 8.02 0.84
CI-16 01-17 15-16 8990.05 0.21 0.20 0.80 0.80 1.32 0.359 5.00 0.07 5.07 7.99 0.82
01-17 CI-18 15-17 6055.99 0.14 0.45 0.55 0.61 0.68 0.498 5.00 0.23 5.23 7.95 0.76
CI-18 CI-19 15-18 8674.23 0.20 0.20 0.80 0.80 1.28 0.697 5.00 0.39 5.39 7.90 0.77
CI-19 CI-20 15-19 14506.51 0.33 0.10 0.90 0.88 2.34 1.030 5.00 0.85 5.85 7.76 0.80
CI-20 CI-21 15-20 8695.43 0.20 0.25 0.75 0.76 1.22 1.230 5.00 1.31 6.31 7.63 0.80
CI-21 CI-22 15-21 8971.56 0.21 0.25 0.75 0.76 1.26 1.436 5.00 1.73 6.73 7.52 0.79
CI-22 CI-23 15-22 7492.04 0.17 0.50 0.50 0.58 0.79 1.608 5.00 2.25 7.25 7.38 0.77
CI-23 SDMH-24B 15-23 7553.20 0.17 0.10 0.90 0.88 1.22 1.781 5.00 2.58 7.58 7.30 0.78
SDMH-24B CI-24 15-24B 1487.19 0.03 0.00 1.00 0.95 0.26 1.815 6.00 2.82 7.82 7.24 0.78
CI-24 SDMH-25 15-24 16609.10 0.38 0.25 0.75 0.76 2.33 2.162 5.00 2.82 7.82 7.24 0.78
SDMH-25 FES-26 15-25 1752.07 0.04 0.00 1.00 0.95 0.31 2.203 5.00 2.91 7.91 7.21 0.78
1
GI-18A CI-18 18A 592.50 0.01 0.00 1.00 0.95 0.10 0.014 5.00 0.00 5.00 8.02 0.95
CI-21A CI-21 21A 9208.20 0.21 0.20 0.80 0.80 1.36 0.211 5.00 0.00 5.00 8.02 0.80
Page 1 of 8

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHA'DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 0 PRELIM / /
LPMPROJECT NAME PROJECT NO 0 CONSTR /X/
Magnolia Hill Apartments Spam-23.01 0 REVISION %/
LOCATION BY 0 RECORD / /
Carthage,North Carolina FDW 0 OTHER / //
CHECKED BY 0 (SPECIFY)
TAC
n= 0.013 STORM DRAINAGE SCHEDULE-CONTINUED
S. 210
h= 21
Q Q UPSTREAM
SIDE- THEO. CAPACITY SEGMENT UPPER UPPER LOWER LOWER RIM
FROM TO DISCHARGE STREAM SLOPE SIZE DIA. (FULL) V FULL LENGTH TIME Pipe Rim INV. Pipe Rim INV. ELEV.
(CFS) (CFS) (IN) (IN) (CFS) (FPS) (FT) (MIN) (FT) (FT) (FT) (FT) (FT)
CI-01 FES-02 0.90 0.0094 7.25 15 6.3 5.1 43 0.14 380.65 379.40 380.25 379.00 382.40
01-3 CI-4 0.84 0.0317 5.62 15 11.5 9.4 95 0.17 386.42 385.17 383.41 382.16 388.17
CI-4 01-5 2.39 0.0050 11.75 15 4.6 3.7 30 0.14 383.31 382.06 383.16 381.91 386.62
CI-5 CI-6 3.54 0.0050 13.62 15 4.6 3.7 66 0.29 383.06 381.81 382.73 381.48 386.14
CI-6 01-7 4.27 0.0050 14.61 15 4.6 3.7 32 0.14 382.63 381.38 382.47 381.22 386.50
_ 01-7 CI-8 5.62 0.0050 16.20 18 7.4 4.2 66 0.26 382.47 380.97 382.14 380.64 386.14
_ CI-8 01-9 6.07 0.0050 16.67 18 _ 7.4 4.2 136 0.54 382.04 380.54 381.36 379.86 387.32
_ 01-9 01-10 10.86 4.09 0.0050 23.38 24 16.0 5.1 65 0.21 381.36 379.36 381.03 379.03 386.27
01-10 CI-11F 15.55 0.0050 23.73 24 16.0 5.1 70 0.23 380.93 378.93 380.59 378.59 385.22
CI-11F CI-11 18.23 2.75 0.0049 26.64 30 28.7 5.8 70 0.20 380.58 378.08 380.24 377.74 385.50
CI-11 CI-12 24.90 4.41 0.0050 30.09 30 29.0 5.9 80 0.23 380.24 377.74 379.84 377.34 385.00
_ CI-12 CI-13 25.96 0.0050 28.75 30 29.0 5.9 137 0.39 379.74 377.24 379.06 376.56 386.37
CI-13 FES-14 26.57 0.0050 29.00 30 29.0 5.9 19 0.05 378.98 376.48 378.89 376.39 384.96
01-11A GI-11B 0.89 0.0061 7.81 15 5.0 4.1 138 0.56 384.60 383.35 383.76 382.51 387.50
01-11B GI-11C 2.58 0.0050 12.10 15 4.6 3.7 61 0.27 381.02 379.77 380.72 379.47 385.50
GI-11C CI-11C2 3.10 0.0045 13.22 15 4.3 3.5 15 0.07 380.62 379.37 380.55 379.30 385.00
CI-1102 CI-11D 4.18 0.0050 14.50 15 4.6 3.7 84 0.38 380.45 379.20 380.03 378.78 385.66
CI-11D CI-11 4.41 0.0050 14.78 15 4.6 3.7 26 0.12 379.93 378.68 379.80 378.55 386.66
CI-09A CI-09B 3.45 0.0050 13.48 15 _ 4.6 3.7 140 0.63 382.86 381.61 382.16 380.91 388.81
_ CI-09B CI-09C 3.97 0.0050 14.21 15 4.6 3.7 49 0.22 382.06 380.81 381.82 380.57 388.32
CI-09C CI-09 4.09 0.0050 14.38 15 4.6 3.7 72 0.32 381.72 380.47 381.36 380.11 387.64
01-1101 GI-11C2 1.06 0.0050 8.67 15 4.6 3.7 58 0.26 383.05 381.80 382.76 381.51 385.95
CI-11E CI-11F 2.75 0.0050 12.39 15 4.6 3.7 74 0.33 380.95 379.70 380.58 379.33 386.66
CI-15 01-16 1.02 0.0050 8.56 15 4.6 3.7 16 0.07 389.63 388.38 389.55 388.30 391.38
CI-16 01-17 2.34 0.0050 11.66 15 4.6 3.7 35 0.16 388.58 387.33 388.40 387.15 391.47
01-17 CI-18 3.00 0.0050 12.81 15 4.6 3.7 104 0.47 387.96 386.71 387.44 386.19 391.00
CI-18 CI-19 4.35 0.10 0.0050 14.84 15 4.6 3.7 102 0.46 387.34 386.09 386.83 385.58 391.45
CI-19 CI-20 6.54 0.0050 17.14 18 7.4 4.2 105 0.42 385.71 384.21 385.19 383.69 390.16
CI-20 CI-21 7.59 0.0050 18.17 24 15.9 5.1 157 0.52 385.19 383.19 384.41 382.41 389.00
_ CI-21 CI-22 10.02 1.36 0.0050 21.10 24 16.0 5.1 102 0.34 384.31 382.31 383.80 381.80 388.22
_ CI-22 CI-23 14.57 3.98 0.0050 25.35 30 29.0 5.9 83 0.23 382.20 379.70 381.78 379.28 387.19
CI-23 SDMH-24B 17.89 2.31 0.0050 26.13 30 29.1 5.9 34 0.09 381.68 379.18 381.51 379.01 386.38
_ SDMH-24B CI-24 18.04 0.0047 25.37 30 28.1 5.7 29 0.09 381.51 379.01 381.37 378.87 386.90
CI-24 SDMH-25 20.24 0.33 0.0050 26.35 30 29.0 5.9 69 0.19 381.27 378.77 380.93 378.43 386.25
SDMH-25 FES-26 20.47 0.0050 26.30 30 29.0 5.9 60 0.17 380.83 378.33 380.53 i 378.03 387.09
01-18A CI-18 0.10 0.0262 2.66 15 10.5 8.5 38 0.07 389.75 388.50 388.76 387.51 391.50
CI-21A CI-21 1.36 0.0050 9.50 15 4.6 3.7 60 0.27 384.37 383.12 384.07 382.82 388.22
Page of

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 PRELIM / /
L PROJECT NAMECONSTR /X/
Magnolia Hill Apartments Spam-23.01
PROJECTNO REVISION %/
LOCATION NO
BY RECORD / /
Carthage,North Carolina FDW OTHER / //
CHECKED BY (SPECIFY)
TAC
n= 0.013 HYDRAULIC GRADE LINE CONTINUED -1.
9= 210 BEND LOSS KS
h= 21 90 DEG=0.7 45 DEG=0.42 30 DEG=0.28
60 DEG=0.55 15 DEG=0.10
PIPE HYDRAULIC SIDESTREAM HEAD LOSS BEND FRICTION FRICTION
FROM TO AREA RADIUS SUMMATION Hf He He Hb Ht LOSS SLOPE VELOCITY
(FT) (FT) (CFS) K (FT/FT) (FPS)
CI-01 FES-02 1.2272 0.3125 0.00 0.01 0.00 0.00 0.00 0.01 0.00 0.0002 0.73
CI-3 CI-4 1.2272 0.3125 0.00 0.02 0.00 0.00 0.00 0.02 0.00 0.0002 0.68
CI-4 CI-5 1.22 1 0.3125 0.00 0.04 0.01 0.02 0.00 0.08 0.00 0.0014 1.94
CI-5 CI-6 1.2272 0.3125 0.00 0.20 0.03 0.04 0.00 0.27 0.00 0.0030 2.88
CI-6 CI-7 1.2272 0.3125 0.00 0.14 0.05 0.07 0.00 0.25 0.00 0.0043 3.46
CI-7 CI-8 1.7671 0.3750 0.00 0.19 0.04 0.05 0.02 0.30 0.10 0.0028 3.17
C1-8 CI-9 1.7671 0.3750 0.00 0.45 0.05 0.06 0.13 0.69 0.70 0.0033 3.42
CI-9 CI-10 3.1416 0.5000 4.09 0.15 0.05 0.06 0.02 0.28 0.10 0.0023 3.44
CI-10 CI-11F 3.1416 0.5000 4.09 0.33 0.09 0.13 0.00 0.55 0.00 0.0047 4.92
CI-11F CI-11 4.9087 0.6250 6.84 0.14 0.05 0.07 0.02 0.28 0.10 0.0020 3.69
CI-11 CI-12 4.9087 0.6250 11.24 0.29 0.10 0.14 0.22 0.75 0.55 0.0037 5.04
CI-12 CI-13 4.9087 0.6250 11.24 0.54 0.11 0.15 0.04 0.84 0.10 0.0040 5.26
CI-13 FES-14 4.9087 0.6250 11.24 0.08 0.11 0.16 0.25 0.60 0.55 0.0042 5.38
GI-11A GI-11B 1.2272 0.3125 0.00 0.03 0.00 0.00 0.00 0.03 0.00 0.0002 0.72
GI-11B GI-11C 1.2272 0.3125 0.00 0.10 0.02 0.02 0.00 0.14 0.00 0.0016 2.09
GI-11C CI-11C2 1.2272 0.3125 0.00 0.03 0.02 0.03 0.00 0.09 0.00 0.0023 2.52
CI-11C2 CI-11D 1.2272 0.3125 0.00 0.35 0.04 0.06 0.13 0.58 0.70 0.0042 3.40
CI-11D CI-11 1.2272 0.3125 0.00 0.12 0.05 0.07 0.08 0.32 0.42 0.0046 3.58
CI-09A CI-09B 1.2272 0.3125 0.00 0.40 0.03 0.04 0.00 0.47 0.00 0.0028 2.80
CI-09B CI-09C 1.2272 0.3125 0.00 0.18 0.04 0.06 0.11 0.39 0.70 0.0038 3.22
CI-09C CI-09 1.2272 0.3125 0.00 0.29 0.04 0.06 0.12 0.51 0.70 0.0040 3.32
GI-11C1 GI-11C2 1.2272 0.3125 0.00 0.02 0.00 0.00 0.00 0.02 0.00 0.0003 0.86
CI-11E CI-11F 1.2272 0.3125 0.00 0.13 0.02 0.03 0.00 0.18 _' 0.00 0.0018 2.23
CI-15 CI-16 1.2272 0.3125 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.0003 0.83
CI-16 GI-17 1.2272 0.3125 0.00 0.05 0.01 0.02 0.00 0.08 0.00 0.0013 1.90
GI-17 CI-18 1.2272 0.3125 0.00 0.22 0.02 0.03 0.00 0.28 0.00 0.0022 2.44
CI-18 CI-19 1.2272 0.3125 0.10 0.46 0.05 0.07 0.00 0.58 0.00 0.0045 3.53
CI-19 CI-20 1.7671 0.3750 0.10 0.40 0.05 0.07 0.02 0.55 0.10 0.0039 3.68
CI-20 CI-21 3.1416 0.5000 0.10 0.18 0.02 0.03 0.06 0.29 0.70 0.0011 2.40
CI-21 CI-22 3.1416 0.5000 1.46 0.20 0.04 0.05 0.02 0.31 0.10 0.0019 3.17
CI-22 CI-23 4.9087 0.6250 5.44 0.10 0.03 0.05 0.00 0.19 0.00 0.0013 2.95
CI-23 SDMH-24B 4.9087 0.6250 7.75 0.06 0.05 0.07 0.11 0.30 _ 0.55 0.0019 3.62
SDMH-24B CI-24 4.9087 0.6250 7.75 0.06 0.05 0.07 0.06 0.24 _ 0.28 0.0019 3.65
CI-24 SDMH-25 4.9087 0.6250 8.08 0.17 0.07 0.09 0.11 0.43 0.42 0.0024 4.10
SDMH-25 FES-26 4.9087 0.6250 8.08 0.15 0.07 0.09 0.11 0.42 0.42 0.0025 4.15
GI-18A CI-18 1.2272 0.3125 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0000 0.08
CI-21A CI-21 1.2272 0.3125 0.00 0.03 0.00 0.01 0.00 0.04 0.00 0.0004 1.10
Page of8

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 PRELIM / /
p
PROJECT NAME PROJECT NO CONSTR /X/
Magnolia Hill Apartments Spam-23.01 REVISION / /
LOCATION BY RECORD / /
Carthage,North Carolina FDW OTHER / //
CHECKED BY (SPECIFY)
TAC
DESIGN CRITERIA:
n= 0.013 HYDRAULIC GRADE LINE-CONTINUED 1.DESIGN FOR THE 10 YR STORM
g= 210 2.ASSUME TIME OF CONCENTRATION TO
h= 21 AN INDIVIDUAL INLET=5 MIN.(Unless otherwise noted)
INLET W.S.ELEV. FREE- 3.INTENSITY=g/(h+T),FOR 10 YR STORM
OUTLET OUTLET INLET USE FLOW BOARD (g and h were derived from Raleigh,N.C.Intensity-
FROM TO W.S.ELEV CONTOL CONTROL CONDITION RIM COMMENTS Duration-Frequency Charts,REF:NC Erosion and
(FT) (FT) (FT) (FT) CONTROL (FT) Sediment Control Planning and Design Manual)
CI-01 FES-02 380.00 380.01 380.05 380.05 INLET 2.35 OK
INV.EL. 379.00
CI-3 Cl-4 383.28 383.30 385.82 385.82 INLET _ I 2.35 OK
CI-4 CI-5 383.20 383.28 382.85 383.28 OUTLET 1 3.34 OK
CI-5 CI-6 382.93 383.20 382.79 383.20 OUTLET 1 2.94 OK
CI-6 CI-7 382.68 382.93 382.52 382.93 OUTLET 3.57 OK
CI-7 CI-8 382.38 382.68 382.16 382.68 OUTLET 3.46 OK
CI-8 CI-9 381.70 382.38 381.80 382.38 OUTLET 4.94 OK
CI-9 CI-10 381.42 381.70 380.88 381.70 OUTLET 4.57 OK
CI-10 CI-11F 380.87 381.42 380.99 381.42 OUTLET 3.80 OK
CI-11F CI-11 380.58 380.87 379.92 380.87 OUTLET 4.63 OK
CI-11 CI-12 379.84 380.58 380.10 380.58 OUTLET 4.42 OK
CI-12 CI-13 378.99 379.84 379.70 379.84 OUTLET 6.53 OK
CI-13 FES-14 378.39 378.98 378.99 378.99 INLET 5.97 OK
INV.EL. 376.39
GI-11A GI-11B 383.51 383.54 384.00 384.00 INLET 3.50 OK
GI-11B GI-11C 381.26 381.40 380.59 381.40 OUTLET 4.10 OK
GI-11C CI-11C2 381.17 381.26 380.27 381.26 OUTLET 3.74 OK
CI-11C2 CI-11D 380.58 381.17 380.33 381.17 OUTLET 4.49 OK
CI-11D CI-11 379.55 379.87 379.86 379.87 OUTLET 6.79 OK
WS ELEV CI-11 380.58
CI-09A CI-09B 382.60 383.07 382.58 383.07 OUTLET 5.74 OK
CI-09B CI-09C 382.21 382.60 381.89 382.60 OUTLET 5.72 OK
CI-09C CI-09 381.70 382.21 381.57 382.21 OUTLET 5.43 OK
WS ELEV CI-11 381.70
GI-11C1 GI-11C2 382.51 382.53 382.46 382.53 OUTLET 3.42 OK
WS ELEV CI-11C 381.26
CI-11E CI-11F 380.87 381.05 380.54 381.05 OUTLET 5.61 OK
WS ELEV CI-11B 380.87
CI-15 CI-16 389.30 389.31 389.04 389.31 OUTLET 2.07 OK
CI-16 01-17 388.15 388.23 388.11 388.23 OUTLET 3.24 OK
01-17 CI-18 387.25 387.53 387.59 387.59 INLET 3.41 OK
CI-18 CI-19 386.58 387.15 387.25 387.25 INLET 4.20 OK
CI-19 CI-20 384.89 385.44 385.55 385.55 INLET 4.61 OK
CI-20 CI-21 384.01 384.30 384.44 384.44 INLET 4.56 OK
CI-21 CI-22 383.40 383.71 383.75 383.75 INLET 4.47 OK
CI-22 CI-23 381.42 381.60 381.33 381.60 OUTLET 5.59 OK
CI-23 SDMH-24B 381.12 381.42 381.01 381.42 OUTLET 4.96 OK
SDMH-24B CI-24 380.88 381.12 380.84 381.12 OUTLET 5.78 OK
CI-24 SDMH-25 380.45 380.88 380.75 380.88 OUTLET 5.37 OK
SDMH-25 FES-26 380.03 380.45 380.33 380.45 OUTLET 6.64 OK
INV.EL. 378.03
GI-18A CI-18 388.51 388.51 389.13 389.13 INLET 2.37 OK
WS ELEV CI-18 387.51
CI-21A CI-21 383.82 383.86 383.80 383.86 OUTLET 4.36 OK
WS ELEV CI-21 383.75
Page 4 of 8

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 PRELIM / /
L PROJECT NAME PROJECT NO CONSTR /X/
Magnolia Hill Apartments Spam-23.01 REVISION %/
LOCATION BY RECORD / /
Carthage,North Carolina FDW OTHER / //
CHECKED BY (SPECIFY)
TAC
n= 0.013 STORM DRAINAGE SCHEDULE CONTINUED -k
9= 210
h= 21
INLET Tc I Cc
INLET INLET Cc INLET TOTAL INLET PIPE TIME RUNOFF
FROM TO AREAS AREA AREA Soils Impervious RUNOFF DISCHARGE AREAS TIME TIME OF CONC. INTENSITY COEFF.
(INLETS) (SF) (AC) (%) (%) COEFF. (CFS) (AC) (MIN) (MIN) (MIN) (IN/HR)
DB-22A DB-22B 22A 5738.11 0.13 0.40 0.60 0.65 0.69 0.132 5.00 0.00 5.00 8.02 0.65
DB-22B DB-22C 22A-22B 11615.11 0.27 0.75 0.25 0.39 0.83 0.398 5.00 0.53 5.53 7.86 0.47
DB-22C CI-22D 22A-22C 4883.43 0.11 0.40 0.60 0.65 0.58 0.510 5.00 0.92 5.92 7.74 0.51
CI-22D CI-22 22A-22D 4285.69 0.10 0.15 0.85 0.84 0.66 0.609 5.00 1.30 6.30 7.64 0.57
GI-22E CI-22 22E 18965.16 0.44 0.75 0.25 0.39 1.35 0.435 5.00 0.00 5.00 8.02 0.39
CI-23A CI-23B 23A 9150.26 0.21 0.40 0.60 0.65 1.09 0.210 5.00 0.00 5.00 8.02 0.65
CI-23B CI-23 23A-23B I 8837.23 0.20 0.25 0.75 0.76 1.24 0.413 5.00 0.24 5.24 7.94 0.71
1
CI-24A CI-24 24A 8940.17 0.21 1.00 0.00 0.20 0.33 0.205 5.00 0.00 5.00 8.02 0.20
DB-27 DB-28A 27 3040.48 0.07 0.75 0.25 0.39 0.22 0.070 5.00 0.00 5.00 8.02 0.39
DB-28A DB-28 27-28A 4034.32 0.09 0.50 0.50 0.58 0.43 0.093 5.00 0.52 5.52 7.86 1.02
DB-28 DB-30A 27-28 6864.92 0.16 0.50 0.50 0.58 0.73 0.227 5.00 0.96 5.96 7.73 0.52
DB-30A CI-30 27-29 2782.21 0.06 0.10 0.90 0.88 0.45 0.291 5.00 1.21 6.21 7.66 0.60
CI-30 CI-31 27-30 6885.65 0.16 0.30 0.70 0.73 0.92 0.449 5.00 1.66 6.66 7.54 0.64
CI-31 CI-32 27-31 16304.09 0.37 0.25 0.75 0.76 2.29 0.824 5.00 2.07 7.07 7.43 0.70
CI-32 SDMH-33A 27-32 6134.69 0.14 0.25 0.75 0.76 0.86 0.964 6.00 2.64 7.64 7.28 0.71
SDMH-33A FES-33 27-33A 2356.38 0.14 0.00 1.00 0.95 1.07 0.964 5.00 2.64 7.64 7.28 0.73
GI-32A GI-32B 32A 3540.73 0.08 1.00 0.00 0.20 0.13 0.081 5.00 0.00 5.00 8.02 0.20
GI-32B CI-32 32A-32B 11363.97 0.26 0.75 0.25 0.39 0.81 0.342 5.00 0.43 5.43 7.89 0.34
GI-32B1 GI-32B 32B1 20999.25 0.48 0.75 0.25 0.39 1.50 0.482 5.00 0.00 5.00 8.02 0.39
FES-35 FES-36 35-36 77153.05 1.77 0.75 0.25 0.39 5.50 1.771 5.00 0.00 5.00 8.02 0.39
FES-37 FES-38 37-38 258764.42 5.94 0.75 0.25 0.39 18.45 5.940 5.00 0.00 5.00 8.02 0.39
Page 5 of 8

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHA:DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 0 PRELIM / /
LPMPROJECT NAME PROJECT NO 0 CONSTR /X/
Magnolia Hill Apartments Spam-23.01 0 REVISION %/
LOCATION BY 0 RECORD / /
Carthage,North Carolina FDW 0 OTHER / //
CHECKED BY 0 (SPECIFY)
TAC
n= 0.013 STORM DRAINAGE SCHEDULE-CONTINUED
S. 210
h= 21 _
Q Q UPSTREAM
SIDE- THEO. CAPACITY SEGMENT UPPER UPPER LOWER LOWER RIM
FROM TO DISCHARGE STREAM SLOPE SIZE DIA. (FULL) V FULL LENGTH TIME Pipe Rim INV. Pipe Rim INV. ELEV.
(CFS) (CFS) (IN) (IN) (CFS) (FPS) (FT) (MIN) (FT) (FT) (FT) (FT) (FT)
_ DB-22A DB-22B 0.69 0.0069 6.92 8 _ 1.0 2.9 92 _ 0.53 384.31 383.64 383.67 383.00 387.50
_ DB-22B DB-22C 1.48 0.0050 9.83 12 2.5 3.2 74 0.38 383.07 382.07 382.70 381.70 386.00
_ DB-22C CI-22D 2.03 0.0050 11.05 12 2.5 3.2 18 0.10 382.60 381.60 382.51 381.51 386.50
CI-22D 01-22 2.63 0.0050 12.18 15 4.6 3.7 60 0.27 382.51 381.26 382.21 380.96 387.19
GI-22E 01-22 1.35 0.0155 7.68 15 8.0 6.5 63 0.16 384.50 383.25 383.52 382.27 386.25
CI-23A CI-23B 1.09 0.0050 8.77 15 4.6 3.7 54 0.24 383.06 381.81 382.79 381.54 386.25
CI-23B 01-23 2.31 0.0050 11.63 15 4.5 3.7 61 0.27 382.69 381.44 382.39 381.14 386.47
CI-24A 01-24 0.33 0.0281 4.04 15 10.8 8.8 120 0.23 385.85 384.60 382.48 381.23 388.60
DB-27 DB-28A 0.22 0.0050 4.78 6 0.4 2.0 63 0.52 389.32 388.82 389.00 388.50 393.00
DB-28A DB-28 0.74 0.0050 7.58 8 0.9 2.4 64 0.44 389.00 388.33 388.68 388.01 394.00
_ DB-28 DB-30A 0.91 0.0050 8.18 12 2.5 3.2 48 _ 0.25 387.65 386.65 387.41 386.41 393.00
DB-30A CI-30 1.33 0.0050 9.45 15 4.5 3.7 101 0.46 387.41 386.16 386.91 385.66 391.22
CI-30 01-31 2.17 0.0050 11.34 15 4.6 3.7 90 0.40 386.81 385.56 386.36 385.11 391.26
CI-31 01-32 4.26 0.0050 14.60 15 4.6 3.7 128 0.58 386.26 385.01 385.62 384.37 391.80
CI-32 SDMH-33A 7.38 2.42 0.0360 13.78 15 12.3 10.0 55 0.09 385.52 384.27 383.55 382.30 390.67
SDMH-33A FES-33 7.57 0.0419 13.49 15 13.2 10.8 54 0.08 383.46 382.21 381.19 379.94 391.92
GI-32A GI-32B 0.13 0.0082 _ 3.60 15 5.9 4.8 122 0.43 387.50 386.25 386.49 385.24 389.25
GI-32B 01-32 2.42 1.50 _ 0.0082 _ 12.89 15 5.9 4.8 100 0.35 386.49 385.24 385.67 I 384.42 388.50
I
GI-32B1 GI-32B 1.50 0.0075 9.14 15 5.6 4.6 100 0.37 387.00 385.75 386.25 385.00 388.75
FES-35 FES-36 5.50 0.0131 13.41 15 7.4 6.0 100 0.28 387.00 385.75 385.69 384.44 388.75
FES-37 FES-38 18.45 0.0572 16.02 18 25.1 14.2 100 0.12 387.00 385.50 381.29 379.79 388.75
Page 6 of

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 PRELIM / /
L PROJECT NAMECONSTR /X/
Magnolia Hill Apartments Spam-23.01
PROJECTNO REVISION %/
LOCATION NO
BY RECORD / /
Carthage,North Carolina FDW OTHER / //
CHECKED BY (SPECIFY)
TAC
n= 0.013 HYDRAULIC GRADE LINE CONTINUED -1.
9= 210 BEND LOSS KS
h= 21 90 DEG=0.7 45 DEG=0.42 30 DEG=0.28
60 DEG=0.55 15 DEG=0.10
PIPE HYDRAULIC SIDESTREAM HEAD LOSS BEND FRICTION FRICTION
FROM TO AREA RADIUS SUMMATION Hf He He Hb Ht LOSS SLOPE VELOCITY
(FT) (FT) (CFS) K (FT/FT) (FPS)
4
DB-22A DB-22B 0.3491 0.1667 0.00 0.30 0.01 0.02 0.00 0.33 0.00 0.0032 1.96
DB-22B DB-22C 0.7854 0.2500 0.00 0.13 0.01 0.02 0.00 0.16 0.00 0.0017 1.88
DB-22C CI-22D 0.7854 0.2500 0.00 0.06 0.03 0.04 0.07 0.19 0.70 0.0032 2.57
CI-22D CI-22 1.2272 0.3125 0.00 0.10 0.02 0.02 0.01 0.15 0.10 0.0016 2.13
GI-22E CI-22 1.2272 0.3125 0.00 0.03 0.00 0.01 0.00 0.04 0.00 0.0004 1.10
CI-23A CI-23B 1.2272 0.3125 0.00 0.02 0.00 0.00 0.00 0.02 0.00 0.0003 0.89
CI-23B CI-23 1.2272 0.3125 0.00 0.08 0.01 0.02 0.04 0.15 0.70 0.0013 1.88
CI-24A CI-24 1.2272 0.3125 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0000 0.27
DB-27 DB-28A 0.1963 0.1250 0.00 0.09 0.00 0.01 0.00 0.11 0.00 0.0015 1.10
DB-28A DB-28 0.3491 0.1667 0.00 0.24 0.02 0.02 0.07 0.35 1.00 0.0038 2.12
DB-28 DB-30A 0.7854 0.2500 0.00 0.03 0.01 0.01 0.01 0.06 0.70 0.0007 1.16
DB-30A CI-30 1.2272 0.3125 0.00 0.04 0.00 0.01 0.01 0.07 0.70 0.0004 1.08
CI-30 CI-31 1.2272 0.3125 0.00 0.10 0.01 0.02 0.00 0.13 _ 0.00 0.0011 1.76
CI-31 CI-32 1.2272 0.3125 0.00 0.56 0.05 0.07 0.10 0.77 0.55 0.0043 3.46
CI-32 SDMH-33A 1.2272 0.3125 2.42 0.71 0.14 0.20 0.23 1.28 0.42 0.0130 5.99
SDMH-33A FES-33 1.2272 0.3125 2.42 0.74 0.15 0.21 0.32 1.42 0.551 0.0137 6.15
GI-32A GI-32B 1.2272 0.3125 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0000 0.11
GI-32B CI-32 1.2272 0.3125 1.50 0.14 0.02 0.02 0.04 0.22 0.70 0.0014 1.97
01-3281 GI-32B 1.2272 0.3125 0.00 0.05 0.01 0.01 0.00 0.07 0.00 0.0005 1.22
FES-35 FES-36 1.2272 0.3125 0.00 0.72 0.08 0.11 0.00 0.91 0.00 0.0072 4.47
FES-37 FES-38 1.7671 0.3750 0.00 3.06 0.42 0.59 0.00 4.07 0.00 0.0307 10.40
Page of

STORM DRAINAGE/HYDRAULIC GRADE LINE DATE DESIGN PHASE
ANALYSIS: 10 YEAR Au.ust,2023 PRELIM / /
p
PROJECT NAME PROJECT NO CONSTR /X/
Magnolia Hill Apartments Spam-23.01 REVISION / /
LOCATION BY RECORD / /
Carthage,North Carolina FDW OTHER / //
CHECKED BY (SPECIFY)
TAC
DESIGN CRITERIA:
n= 0.013 HYDRAULIC GRADE LINE-CONTINUED 1.DESIGN FOR THE 10 YR STORM
g= 210 2.ASSUME TIME OF CONCENTRATION TO
h= 21 AN INDIVIDUAL INLET=5 MIN.(Unless otherwise noted)
INLET W.S.ELEV. FREE- 3.INTENSITY=g/(h+T),FOR 10 YR STORM
OUTLET OUTLET INLET USE FLOW BOARD (g and h were derived from Raleigh,N.C.Intensity-
FROM TO W.S.ELEV CONTOL CONTROL CONDITION RIM COMMENTS Duration-Frequency Charts,REF:NC Erosion and
(FT) (FT) (FT) (FT) CONTROL (FT) Sediment Control Planning and Design Manual)
DB-22A DB-22B 383.54 383.87 384.14 384.14 INLET 3.36_ OK
DB-22B DB-22C 382.50 382.66 382.72 382.72 INLET 3.28 OK
DB-22C CI-22D 382.31 382.50 382.39 382.50 OUTLET 4.00 OK
CI-22D CI-22 381.96 382.11 382.08 382.11 OUTLET 5.08 OK
WS ELEV CI-22 381.60
GI-22E CI-22 383.27 383.31 383.93 383.93 INLET 2.32 OK
WS ELEV CI-22 381.60
CI-23A CI-23B 382.54 382.56 382.47 382.56 OUTLET 3.69 OK
CI-23B CI-23 382.14 382.29 382.22 382.29 OUTLET 4.18 OK
WS ELEV CI-23 381.42
CI-24A CI-24 382.23 382.23 385.23 385.23 INLET 3.37 OK
WS ELEV CI-24 380.88
DB-27 DB-28A 388.90 389.01 389.12 389.12 INLET 3.88 OK
DB-28A DB-28 388.55 388.90 388.86 388.90 OUTLET 5.10 OK
DB-28 DB-30A 387.42 387.48 387.21 387.48 OUTLET 5.52 OK
DB-30A CI-30 387.35 387.42 386.83 387.42 OUTLET 3.80 OK
CI-30 CI-31 387.22 387.35 386.32 387.35 OUTLET 3.91 OK
CI-31 CI-32 386.45 387.22 386.15 387.22 OUTLET 4.58 OK
CI-32 SDMH-33A 384.48 385.76 386.45 386.45 INLET 4.22 OK
SDMH-33A FES-33 380.94 382.36 384.48 384.48 INLET 7.44 OK
INV.EL. 379.94
GI-32A GI-32B 387.44 387.44 386.88 387.44 OUTLET 1.81 OK
GI-32B CI-32 387.22 387.44 386.04 387.44 OUTLET 1.06 OK
WS ELEV CI-32 387.22
GI-32B1 GI-32B 387.44 387.51 386.44 387.51 OUTLET 1.24 OK
WS ELEV CI-32B 387.44
FES-35 FES-36 385.44 386.35 387.24 387.24 INLET 1.51 OK
WS ELEV CI-32B 0.00
FES-37 FES-38 380.99 385.06 390.95 390.95 INLET (2.20) OVERFLOW
WS ELEV CI-32B 0.00
Page of

Magnolia Hill Apartments
Carthage, North Carolina
Supporting Data

Custom Soil Resource Report
RI Soil Map (SPAM Soil) K1
N
643300 6434W 643500 643600 6437W 6433800 643900 644000 644100 644200 644300 644400 644500 644600 644700 644800
35°16'12"N 35°16'12"N
8
Little-Rimier
414 8 lig
We
,,a.." ;,` ,. MdE
44 Ilk AeD sw.0
AeD, k w �.
""" T "r
Ud 1 ,. / 'i \ ' • • .' I -1 FaB K yMccas •• '
If
it
Ct � t '! . B. : /
. ... - . / _},—
AeD
, AeB \ , ..
".
4.2
8 �000J ��ay�otb, a0ot.;h�d '��aOQ° 1 s t,
35°15'38"N a I~ - _....A[ 35°15'38"N
643300 643400 643500 643600 6437W 643800 643900 644000 6441W 6442W 6443W 6444W 6445W 6446W 6447W 644800
3 3
b, 1
Map Scale:1:7,380 if printed on A landscape(11"x 8.5")sheet. v
Meters
k'' A
N 0 100 200 400 600 r:
Feet
0 350 700 1400 2100
Map projection:Web Mercator Corner coordinates:WGS84 Edge tics:UTM Zone 17N WGS84
9

Custom Soil Resource Report
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) 14 Spoil Area The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) 1:24,000.
Q Stony Spot
Soilsit Very Stony Spot
0 Soil Map Unit Polygons Warning:Soil Map may not be valid at this scale.
Wet Spot
,..,. Soil Map Unit Lines Enlargement of maps beyond the scale of mapping can cause
p Other misunderstandingof the detail of mapping and accuracyof soil
p Soil Map Unit Points pp 9
.• Special Line Features line placement.The maps do not show the small areas of
Special Point Features contrasting soils that could have been shown at a more detailed
Blowout Water Features scale.
Streams and Canals
kg Borrow Pit
Transportation Please rely on the bar scale on each map sheet for map
* clay Spot 1.44 Rails measurements.
0 Closed Depression
o,/ Interstate Highways
Gravel Pit Source of Map: Natural Resources Conservation Service
.r US Routes Web Soil Survey URL:
Gravelly Spot Major Roads Coordinate System: Web Mercator(EPSG:3857)
® Landfill Local Roads Maps from the Web Soil Survey are based on the Web Mercator
• Lava Flow Background projection,which preserves direction and shape but distorts
distance and area.A projection that preserves area,such as the
46 Marsh or swamp Aerial Photography Albers equal-area conic projection,should be used if more
It Mine or Quarry accurate calculations of distance or area are required.
4 Miscellaneous Water This product is generated from the USDA-NRCS certified data as
O Perennial Water of the version date(s)listed below.
v Rock Outcrop Soil Survey Area: Moore County,North Carolina
+ Saline Spot Survey Area Data: Version 26,Sep 13,2023
Sandy Spot Soil map units are labeled(as space allows)for map scales
Severely Eroded Spot 1:50,000 or larger.
• Sinkhole Date(s)aerial images were photographed: Apr 23,2022—Apr
31 Slide or Slip 27,2022
oa Sodic Spot The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps.As a result,some minor
shifting of map unit boundaries may be evident.
10

Custom Soil Resource Report
Map Unit Legend (SPAM Soil)
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
AeB Ailey loamy sand,2 to 8 percent 2.9 1.5%
slopes
AeD Ailey loamy sand,8 to 15 15.0 7.5%
percent slopes
CaB Candor sand,0 to 4 percent 37.2 18.6%
slopes
DoB Dothan loamy sand,2 to 6 18.8 9.4%
percent slopes
FaB Fuquay loamy sand,0 to 6 9.5 4.7%
percent slopes
MdE Mayodan fine sandy loam, 15 to 6.3 3.1%
25 percent slopes
PkF Pinkston silt loam, 15 to 40 17.4 8.7%
percent slopes
Ud Udorthents, loamy 24.3 12.2%
W Water 4.0 2.0%
We Wehadkee loam,0 to 2 percent 64.3 32.2%
slopes,frequently flooded
Totals for Area of Interest 199.7 100.0%
Map Unit Descriptions (SPAM Soil)
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
11

Scott Cole,NCLSS
312 Copples Road Ext
Asheboro,NC 27205
[phone]
LKC Engineering,PLLC December 7, 2023
Attn: Mr. Philip Picerno, PE
140 Aqua Shed Court
Aberdeen,NC 28315
Re: Seasonal High-Water Table Identification: Magnolia Hill Apartments; McCaskill Rd/NC Hwy 22,Carthage,
NC; Moore County,NC parcel 00031348
Soil conditions on the above-referenced property were evaluated within the areas shown on the attached map to determine
the depth to the seasonal high-water table. Work was conducted to satisfy the requirements of the North Carolina
Department of Environmental Quality Stormwater Design Manual. Samples were collected with a hand auger.
SEASONAL HIGH WATER TABLE IDENTIFICATION
Seasonal High Water Table depth is determined by field evaluation for soil wetness conditions which are indicated by the
presence of redoximorphic(redox)features with a chroma of 2 or less(in Munsell color notation)in mottles or the horizon
matrix. Colors of chroma 2 or less due to relic minerals from parent material(underlying rock), anaerobic activity created
by placement of fill material, or soil textural class transitions(perched water) are not considered as indicators for seasonal
high water. Upon determination of SHWT depth,an additional 6"will be deducted from the observed depth to account for
capillary fringe water movement above the SHWT.
The SHWT for this project was not observed within 15' of the ground surface at any location.
A summary of observations within the proposed Stormwater BMP Devices are shown in the table below.
Contour/elevation data obtained from nconemap.gov
Test location# Total Depth Profile Summary SHWT Munsell Color
elevation) Notation
1 (384') 15' (Elevation 0-4': LS(coarse) Not Observed N/A
4-6': SCL
369') 6-9': Clay
9-15': mixed soil
textures
2 (386') 16' (Elevation 0-2.5': SL Not Observed N/A
2.5-6': Saprolite
370 ) 6-10.5': mixed textures
(layered;mottled)
10.5-16': LS/SCL
(layered;mottled)
3 (381') 15' (Elevation 0-5': LS Not Observed N/A
5-8': SCL(mottled)
366 ) 8-9': SC(cemented)
9-15': mixed textures
(layered;mottled)
I am pleased to be of service in this matter and can be contacted at your convenience should you have questions concerning
information within this report.
() L
Scott Cole e�, � f�North Carolina Licensed Soil Scientist Uo ° " .

cz
01
co
\ v.
co
Mo tCO
oMyd
OR fA Oo 36 c
O
d 0
_0
+-'
0
in Z
••.0
co L t'
C R ~ VCI •
mWI—--V) co
O
O
111c/ 9
5 * co
•
♦Mg co
co el; coco
0 OOD
O I..
CO t0
N00
00 t
ZW
..
17;�N
2
JJ`Z
/ _
cr\\ N.
M 13
IP
CJ ����� ;�. d
co co
M vO co
O
Fo Ea Z
Co
M —L
L
N O.
C O.co
O) * O a)-a
NO O O'00i_
N
CO C al
co C 03
coC •
O1 •t0
co �O~o CO W HN
CO T
CO
M Z MI
co •
coC:::A
O r ■ 133
N t7 0
v.
co
(NI
C •co
cc to
1 \YV
n •
�
`
d o PM � 04.
on O Zco �, _ d.
rt
_ , MW CIQ C G.N ..t C b O * O CD•O le• e y� IM S~ 7p CO�A0 9
r ,H(0pcoN a- mWN . .i 41.
co
03
co co
M V J
0
N
—'.."'.'mm.2
39 I I �,
ZZ 5N �.-- J
el a U�,
314 N 316 382 c
c o \ c ._
o c o r 5