SW6210301_1633-CALCULATIONS_20210326

Spirng Village
Wet Pond #1
Main Pond Volume Below Normal Pool
Conto� Contoirr Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
300.15
-
-
300.15
6,811
3
3
301.15
7,631
7,221
7,224
302.15
8,621
8,126
15,350
303.15
9,600
9,111
24,461
304.15
10,562
10,081
34,542
304.65
11,095
5,414
39,956
305.15
12,620
5,929
45,885
Forebay Volume Below Normal Pool
Contotrr Contour Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (,f) (cf) (cf)
300.15
-
-
300.15
871
0
0
301.15
1,179
1,025
1,025
302.15
1,501
1,340
2,365
303.15
1,836
1,669
4,034
304.15
2,182
2,009
6,043
304.65
2,358
1,135
7,178
305.15
2,905
1,316
8,494

Spirng Village
Wet Pond #2
Main Pond Volume Below Normal Pool
Conto� Contoirr Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
315.2
-
-
316.7
6,943
5,207
5,207
317.7
7,717
7,330
12,537
318.7
8,518
8,118
20,655
319.7
9,345
8,932
29,586
320.7
10,196
9,771
39,357
321.2
11,512
5,427
44,784
Forebay Volume Below Normal Pool
Contotrr Contour Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (,f) (cf) (cf)
315.7
-
-
316.7
1,135
568
568
317.7
1,364
1,250
1,817
318.7
1,608
1,486
3,303
319.7
1,868
1,738
5,041
320.1
2,144
802
5,943
321.2
2,579
2,598
8,441

Spirng Village
Wet Pond #3
Main Pond Volume Below Normal Pool
Conto� Contoirr Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
299.0
-
-
299.0
3,838
2
2
299.5
4,084
1,981
1,982
300.5
4,586
4,335
6,317
301.5
5,103
4,945
11,162
302.5
5,634
5,369
16,530
303.5
6,179
5,907
22,437
304.0
7,023
3,301
25,737
Forebay Volume Below Normal Pool
Contotrr Contour Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (,f) (cf) (cf)
299.0
-
-
299.0
500
0
0
299.5
573
268
268
300.5
731
652
920
301.5
905
818
1,738
302.5
1,097
1,001
2,739
303.5
1,305
1,201
3,940
304.0
1,648
738
4,679

Spirng Village
Wet Pond #4
Main Pond Volume Below Normal Pool
Conto� Contoirr Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
298.5
-
-
298.5
11,028
0
0
299.5
11,834
11,431
11,431
300.5
12,657
12,246
23,677
301.0
13,075
6,433
30,110
302.0
13,922
13,499
43,608
303.0
14,788
14,355
57,963
303.5
16,113
7,725
65,688
Forebay Volume Below Normal Pool
Contotrr Contour Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (,f) (cf) (cf)
298.5
-
-
298.5
1,620
0
0
299.5
1,937
1,779
1,779
300.5
2,283
2,110
3,889
301.0
2,464
1,187
5,075
302.0
2,837
2,651
7,726
303.0
3,222
3,030
10,755
303.5
3,823
1,761
12,517

Spirng Village
Wet Pond #5
Main Pond Volume Below Normal Pool
Conto� Contoirr Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
301.5
-
-
301.5
3,862
0
0
302.0
4,258
2,030
2,030
303.0
5,061
4,660
6,690
304.0
5,881
5,471
12,161
305.0
6,714
6,298
18,458
306.0
7,562
7,138
25,596
306.5
8,863
4,106
29,702
Forebay Volume Below Normal Pool
Contotrr Contour Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (,f) (cf) (cf)
301.0
-
-
301.0
741
0
0
302.0
826
784
794
303.0
1,010
918
1,702
304.0
1,211
1,111
2,812
305.0
1,432
1,322
4,134
305.5
1,670
776
4,909
306.0
2,061
933
5,942

Spirng Village
Wet Pond #6
Main Pond Volume Below Normal Pool
Conto� Contoirr Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
294.0
-
-
294.0
2,171
1
1
295.0
2,171
2,171
2,172
296.0
2,171
2,171
4,343
297.0
2,171
2,171
6,514
298.0
2,662
2,417
8,931
298.5
3,429
1,523
10,453
Forebay Volume Below Normal Pool
Contotrr Contour Iner. Aceurn.
Elev. Area Storage Storage (S)
(ft) (,f) (cf) (cf)
294.0
-
-
294.0
335
0
0
295.0
335
335
335
296.0
335
335
670
297.0
335
335
1,005
298.0
335
335
1,340
298.5
450
196
1,536

Spring Village
Pond 41
Antiflotation Calculation
Input Data
Safety Factor:
1.50
Top Width of Riser (ft)
3.00
Top Length of Riser (ft)
4.00
Thickness of Riser (ft)
0.50
Thickness of Bottom of Riser (ft)
0.50
Top of Riser (ft)
309.20
Invert of Riser (ft)
306.00
Volume of Riser (cf)
25.20
Unit Weight Of Concrete (lb/cf)
150.00
Unit Weight of Water (lb/cf)
62.40
Block Height (ft)
0.00
Block Width (ft)
0.00
Block Length (ft),
0.00
Output
Fw (Uplift Force, lb)
2396.16
Fc (Weight of Concrete,lb)
3780.00
Design Volume (cf),
25.20
Design Safety Factorl
Volume OK
1633-POND I Antiflotation.xls 2/23/2021

Spring Village Pond #1 Required Storm Volume
Wet Pond
Drainage Area:
10.62 acres
Impervious Area: 181,944 sf (4.18 ac)
Impervious: 39.3%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*39.3%
= 0.4037
For volume that must be controlled:
Volume=3, 630* Rd * Rv*A
Volume = 3,630*(1 inch)*(0.4037)*10.62 acres = 15,563 cf
Temporary volume stored = 22,163 cf
SA/DA ratio is 1.51 for a depth of 3.0 feet
Required surface area = 10.62 ac * (0.0151) = 0.160362 ac or 6,985 sf
Surface area provided (main permanent pool) = 12,620 sf
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1 910-426-6777 fax [phone] license number I C-2354
On time, every time. I www.4Dsitesolutions.com

Spirng Village
Wet Pond #1
Main Pond Volume Below Normal Pool
Contour Contoirr Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
300.15
-
-
300.15
6,811
3
3
301.15
7,631
7,221
7,224
302.15
8,621
8,126
15,350
303.15
9,600
9,111
24,461
304.15
10,562
10,081
34,542
304.65
11,095
5,414
39,956
305.15
12,620
5,929
45,885
Avg depth: 3.6 ft
Forebay Volume Below Normal Pool
Contour Contour Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
300.15
-
-
300.15
871
0
0
301.15
1,179
1,025
1,025
302.15
1,501
1,340
2,365
303.15
1,836
1,669
4,034
304.15
2,182
2,009
6,043
304.65
2,358
1,135
7,178
305.15
2,905
1,316
8,494
% Forebay size
18%

Spring Village Pond #1
Drawdown Time
Temporary storage volume =
Orifice #1 diameter=
Area of orifice =
Orifice #2 diameter =
Area of orifice =
Orifice Coefficient (Cd) _
Orifice elevation --
Water elevation ---
Driving head (H) _
Discharge (Q) _
Drawdown time =
22,163 cf
2.5 in
1
0.0341 sf
0 in
0
0.0000 sf
0.60
305.18 ft
306.67 ft
0.50 ft
0.1157 cfs
191575 s
53.2 hr
2_2 days
1633-Drawdown.xlsx Printed 4/23/2021

Spring Village Pond #2 Required Storm Volume
Wet Pond
Drainage Area:
7.25 acres
Impervious Area: 108,320 sf (2.49 ac)
Impervious: 34.9%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*34.9%
= 0.3641
For volume that must be controlled:
Volume=3, 630* Rd * Rv*A
Volume = 3,630*(1 inch)*(0.3641)*7.25 acres = 9,582 cf
Temporary volume stored = 14,550 cf
SA/DA ratio is 1.34 for a depth of 3.0 feet
Required surface area = 7.25 ac * (0.0134) = 0.09715 ac or 4,231 sf
Surface area provided (main permanent pool) = 11,512 sf
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1 910-426-6777 fax [phone] license number I C-2354
On time, every time. I www.4Dsitesolutions.com

Spirng Village
Wet Pond #2
Main Pond Volume Below Normal Pool
Contour Contoirr Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
315.2
-
-
316.7
6,943
5,207
5,207
317.7
7,717
7,330
12,537
318.7
8,518
8,118
20,655
319.7
9,345
8,932
29,586
320.7
10,196
9,771
39,357
321.2
11,512
5,427
44,784
Avg depth: 3.9 ft
Forebay Volume Below Normal Pool
Contour Contour Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
315.7
-
-
316.7
1,135
568
568
317.7
1,364
1,250
1,817
318.7
1,608
1,486
3,303
319.7
1,868
1,738
5,041
320.1
2,144
802
5,843
321.2
2,579
2,598
8,441
% Forebay size
19%

Spring Village Pond #2
Drawdown Time
Temporary storage volume =
Orifice #1 diameter=
Area of orifice =
Orifice #2 diameter =
Area of orifice =
Orifice Coefficient (Cd) _
Orifice elevation --
Water elevation ---
Driving head (H) _
Discharge (Q) _
Drawdown time =
14,550 cf
2 in
1
0.0218 sf
0 in
0
0.0000 sf
0.60
321.20 ft
322.40 ft
0.40 ft
0.0664 cfs
218975 s
60.8 hr
2_5 days
1633-Drawdown.xlsx Printed 4/23/2021

Spring Village
Pond 93
Antiflotation Calculation
Input Data
Safety Factor:
1.50
Top Width of Riser (ft)
3.00
Top Length of Riser (ft)
4.00
Thickness of Riser (ft)
0.50
Thickness of Bottom of Riser (ft)
0.50
Top of Riser (ft)
307.70
Invert of Riser (ft)
304.00
Volume of Riser (cf)
28.20
Unit Weight Of Concrete (lb/cf)
150.00
Unit Weight of Water (lb/cf)
62.40
Block Height (11)
0.00
Block Width (ft)
0.00
Block Length (ft),
0.00
Output
Fw (Uplift Force, lb)
2770.56
Fc (Weight of Concrete,lb)
4230.00
Design Volume (cf),
28.20
Design Safety Factorl
1.53
Volume OK
1633-POND 3 Antiflotation.xIs 2/23/2021

Spring Village Pond #3 Required Storm Volume
Wet Pond
Drainage Area:
4.62 acres
Impervious Area: 115,960 sf (2.66 ac)
Impervious: 57.7%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*57.7%
= 0.56939
For volume that must be controlled:
Volume=3, 630* Rd * Rv*A
Volume = 3,630*(1 inch)*(0.5693)*4.62 acres = 9,548 cf
Temporary volume stored = 14,529 cf
SA/DA ratio is 2.09 for a depth of 3.0 feet
Required surface area = 4.62 ac * (0.0209) = 0.096558 ac or 4,206 sf
Surface area provided (main permanent pool) = 7,023 sf
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1 910-426-6777 fax [phone] license number I C-2354
On time, every time. I www.4Dsitesolutions.com

Spirng Village
Wet Pond #3
Main Pond Volume Below Normal Pool
Contour Contoirr Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
299.0
-
-
299.0
3,838
2
2
299.5
4,084
1,981
1,982
300.5
4,586
4,335
6,317
301.5
5,103
4,845
11,162
302.5
5,634
5,369
16,530
303.5
6,179
5,907
22,437
304.0
7,023
3,301
25,737
Avg depth: 3.7 ft
Forebay Volume Below Normal Pool
Contour Contour Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
299.0
-
-
299.0
500
0
0
299.5
573
268
268
300.5
731
652
920
301.5
905
818
1,738
302.5
1,097
1,001
2,739
303.5
1,305
1,201
3,940
304.0
1,648
738
4,679
% Forebay size
18%

Spring Village Pond #3
Drawdown Time
Temporary storage volume =
Orifice #1 diameter=
Area of orifice =
Orifice #2 diameter =
Area of orifice =
Orifice Coefficient (Cd) _
Orifice elevation --
Water elevation ---
Driving head (H) _
Discharge (Q) _
Drawdown time =
14,529 cf
2 in
1
0.0218 sf
0 in
0
0.0000 sf
0.60
304.00 ft
305.69 ft
0.56 ft
0.0789 cfs
184253 s
51.2 hr
2_1 days
1633-Drawdown.xlsx Printed 4/23/2021

Spring Village
Pond 44
Antiflotation Calculation
Input Data
Safety Factor:
1.50
Top Width of Riser (ft)
3.00
Top Length of Riser (ft)
4.00
Thickness of Riser (ft)
0.50
Thickness of Bottom of Riser (ft)
0.50
Top of Riser (ft)
307.35
Invert of Riser (ft)
303.50
Volume of Riser (cf)
29.10
Unit Weight Of Concrete (lb/cf)
150.00
Unit Weight of Water (lb/cf)
62.40
Block Height (ft)
0.00
Block Width (ft)
0.00
Block Length (ft),
0.00
Output
Fw (Uplift Force, lb)
2882.88
Fc (Weight of Concrete,lb)
4365.00
Design Volume (cf),
29.10
Design Safety Factorl
1.51
Volume OK
1633-POND 4 Antiflotation.xls 2/23/2021

Spring Village Pond #4 Required Storm Volume
Wet Pond
Drainage Area:
14.14 acres
Impervious Area: 254,685 sf (5.85 ac)
Impervious: 41.3%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*41.3
= 0.4217
For volume that must be controlled:
Volume=3,630*Rd*Rv*A
Volume = 3,630*(1 inch)*(0.4217)*14.14 acres = 21,645 cf
Temporary volume stored = 32,282 cf
SA/DA ratio is 1.58 for a depth of 3.0 feet
Required surface area = 14.14 ac * (0.0158) = 0.223412 ac or 9,732 sf
Surface area provided (main permanent pool) = 16,116 sf
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1 910-426-6777 fax [phone] license number I C-2354
On time, every time. I www.4Dsitesolutions.com

Spirng Village
Wet Pond #4
Main Pond Volume Below Normal Pool
Contour Contoirr Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
298.5
-
-
298.5
11,028
0
0
299.5
11,834
11,431
11,431
300.5
12,657
12,246
23,677
301.0
13,075
6,433
30,110
302.0
13,922
13,499
43,608
303.0
14,788
14,355
57,963
303.5
16,113
7,725
65,688
Avg depth: 4.1 ft
Forebay Volume Below Normal Pool
Contour Contour Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
298.5
-
-
298.5
1,620
0
0
299.5
1,937
1,779
1,779
300.5
2,283
2,110
3,889
301.0
2,464
1,187
5,075
302.0
2,837
2,651
7,726
303.0
3,222
3,030
10,755
303.5
3,823
1,761
12,517
% Forebay size
19%

Spring Village Pond #4
Drawdown Time
Temporary storage volume =
Orifice #1 diameter=
Area of orifice =
Orifice #2 diameter =
Area of orifice =
Orifice Coefficient (Cd) _
Orifice elevation --
Water elevation ---
Driving head (H) _
Discharge (Q) _
Drawdown time =
32,282 cf
3 in
1
0.0491 sf
0 in
0
0.0000 sf
0.60
303.50 ft
305.22 ft
0.57 ft
0.1790 cfs
180358 s
50.1 hr
2_1 days
1633-Drawdown.xlsx Printed 4/23/2021

Spring Village
Pond 95
Antiflotation Calculation
Input Data
Safety Factor:
1.50
Top Width of Riser (ft)
3.00
Top Length of Riser (ft)
4.00
Thickness of Riser (ft)
0.50
Thickness of Bottom of Riser (ft)
0.50
Top of Riser (ft)
309.30
Invert of Riser (ft)
306.50
Volume of Riser (cf)
22.80
Unit Weight Of Concrete (lb/cf)
150.00
Unit Weight of Water (lb/cf)
62.40
Block Height (11)
0.00
Block Width (ft)
0.00
Block Length (ft),
0.00
Output
Fw (Uplift Force, lb)
2096.64
Fc (Weight of Concrete,lb)
3420.00
Design Volume (cf),
22.80
Design Safety Factorl
1.63
Volume OK
1633-POND 5 Antiflotation.xls 2/23/2021

Spring Village Pond #5 Required Storm Volume
Wet Pond
Drainage Area:
5.54 acres
Impervious Area: 123,797 sf (2.84 ac)
Impervious: 51.3%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*51.3%
= 0.5117
For volume that must be controlled:
Volume=3,630*Rd*Rv*A
Volume = 3,630*(1 inch)*(0.5117)*5.54 acres = 10,290 cf
Temporary volume stored = 14,007 cf
SA/DA ratio is 1.79 for a depth of 3.0 feet
Required surface area = 5.54 ac * (0.0179) = 0.099166 ac or 4,320 sf
Surface area provided (main permanent pool) = 8,863 sf
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1 910-426-6777 fax [phone] license number I C-2354
On time, every time. I www.4Dsitesolutions.com

Spirng Village
Wet Pond #5
Main Pond Volume Below Normal Pool
Contour Contoirr Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
301.5
-
-
301.5
3,862
0
0
302.0
4,258
2,030
2,030
303.0
5,061
4,660
6,690
304.0
5,881
5,471
12,161
305.0
6,714
6,298
18,458
306.0
7,562
7,138
25,596
306.5
8,863
4,106
29,702
Avg depth: 3.4 ft
Forebay Volume Below Normal Pool
Contour Contour Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
301.0
-
-
301.0
741
0
0
302.0
826
784
784
303.0
1,010
918
1,702
304.0
1,211
1,111
2,812
305.0
1,432
1,322
4,134
305.5
1,670
776
4,909
306.0
2,061
933
5,842
% Forebay size:
19%

Spring Village Pond #5
Drawdown Time
Temporary storage volume =
Orifice #1 diameter=
Area of orifice =
Orifice #2 diameter =
Area of orifice =
Orifice Coefficient (Cd) _
Orifice elevation --
Water elevation ---
Driving head (H) _
Discharge (Q) _
Drawdown time =
14,007 cf
2 in
1
0.0218 sf
0 in
0
0.0000 sf
0.60
306.50 ft
307.84 ft
0.45 ft
0.0702 cfs
199487 s
55.4 hr
2_3 days
1633-Drawdown.xlsx Printed 4/23/2021

Spring Village
Pond 46
Antiflotation Calculation
Input Data
Safety Factor:
1.50
Top Width of Riser (ft)
3.00
Top Length of Riser (ft)
4.00
Thickness of Riser (ft)
0.50
Thickness of Bottom of Riser (ft)
0.50
Top of Riser (ft)
301.19
Invert of Riser (ft)
298.50
Volume of Riser (cf)
22.14
Unit Weight Of Concrete (lb/cf)
150.00
Unit Weight of Water (lb/cf)
62.40
Block Height (ft)
0.00
Block Width (ft)
0.00
Block Length (ft),
0.00
Output
Fw (Uplift Force, lb)
2014.27
Fc (Weight of Concrete,lb)
3321.00
Design Volume (cf),
22.14
Design Safety Factorl
1.65
Volume OK
1633-POND 6 Antiflotation.xls 2/23/2021

Spring Village Pond #6 Required Storm Volume
Wet Pond
Drainage Area:
2.25 acres
Impervious Area: 54,278 sf (1.25 ac)
Impervious: 55.4%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*55.4%
For volume that must be controlled:
Volume=3,630*Rd*Rv*A
Volume = 3,630*(1 inch)*(0.5486)*2.25 acres = 4,481 cf
Temporary volume stored = 6,139 cf
SA/DA ratio is 1.94 for a depth of 3.0 feet
Required surface area = 2.25ac * (0.0194) = 0.04365 ac or 1,901 sf
Surface area provided (main permanent pool) = 3,429 sf
409 Chicago Drive, Suite 112, Fayetteville, NC 28306
office 1 910-426-6777 fax [phone] license number I C-2354
On time, every time. I www.4Dsitesolutions.com

Spirng Village
Wet Pond #6
Main Pond Volume Below Normal Pool
Contour Contoirr Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
294.0
-
-
294.0
2,171
1
1
295.0
2,171
2,171
2,172
296.0
2,171
2,171
4,343
297.0
2,171
2,171
6,514
298.0
2,662
2,417
8,931
298.5
3,429
1,523
10,453
Avg depth: 3.0 ft
Forebay Volume Below Normal Pool
Contour Contour Incr. Accum.
Elev. Area Storage Storage (S)
(ft) (sf) (cf) (cf)
294.0
-
-
294.0
335
0
0
295.0
335
335
335
296.0
335
335
670
297.0
335
335
1,005
298.0
335
335
1,340
298.5
450
196
1,536
%Forebay size
15%

Spring Village Pond #6
Drawdown Time
Temporary storage volume =
Orifice #1 diameter=
Area of orifice =
Orifice #2 diameter =
Area of orifice =
Orifice Coefficient (Cd) _
Orifice elevation --
Water elevation ---
Driving head (H) _
Discharge (Q) _
Drawdown time =
6,139 cf
1.25 in
1
0.0085 sf
0 in
0
0.0000 sf
0.60
298.50 ft
299.92 ft
0.47 ft
0.0282 cfs
217428 s
60.4 hr
2_5 days
1633-Drawdown.xlsx Printed 4/23/2021