SW3180305_ASBUILTS_6028-MCC-Calc Book_20201117

ENGINEERING CALCULATIONS
FOR
MITCHELL COMMUNITY COLLEGE
HEALTH SCIENCES BUILDING
Prepared by:
LandDesign, Inc.
223 North Graham St.
Calculations by: GR
Checked by: MDM
"CAR,',,
�J
03 KA -
17 Nov 2020
AS-BUILTS:
November 10, 2020
LandDesign PN: 1016028
LandDesign

1S
Pre -development Area
S4
Reach on L
ink
4S
Post-dev lopment
On site
2S A 5P
O
Post -development to Sand Filter Flow plitter
Basin
6S
Post -development
Off -site

6028 Sand Filter
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 2
Notes Listing (all nodes)
Line# Node Notes
Number
is 50% woods & 50% pasture

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 3
Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment1S: Pre-developmentArea Runoff Area=2.000 ac 7.00% Impervious Runoff Depth=0.22"
Flow Length=422' Tc=13.4 min CN=87 Runoff=0.78 cfs 0.037 of
Subcatchment2S: Post-developmentto Runoff Area=0.810 ac 8.64% Impervious Runoff Depth=0.22"
Tc=10.0 min CN=87 Runoff=0.37 cfs 0.015 of
Subcatchment4S: Post -development Runoff Area=1.190 ac 58.82% Impervious Runoff Depth=0.45"
Tc=5.0 min CN=93 Runoff=1.39 cfs 0.045 of
Subcatchment6S: Post -development Runoff Area=1.320 ac 0.00% Impervious Runoff Depth=0.00"
Tc=5.0 min CN=69 Runoff=0.00 cfs 0.000 of
Pond 3P: Sand Filter Peak Elev=893.87' Storage=2,044 cf Inflow=1.18 cfs 0.054 of
Outflow=0.04 cfs 0.054 of
Pond 5P: Flow Splitter Peak Elev=892.97' Inflow=1.39 cfs 0.045 of
Primary=0.90 cfs 0.039 of Secondary=0.49 cfs 0.006 of Outflow=1.39 cfs 0.045 of
Total Runoff Area = 5.320 ac Runoff Volume = 0.097 of Average Runoff Depth = 0.22"
82.89% Pervious = 4.410 ac 17.11% Impervious = 0.910 ac

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 1S: Pre -development Area
50% woods & 50% pasture
Runoff = 0.78 cfs @ 3.08 hrs, Volume= 0.037 af, Depth= 0.22"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 6-hr 1-in 6-hr WQv Rainfall=1.00"
Area (ac)
CN
Description
0.140
98
Paved parking, HSG B
1.860
86
Fallow, bare soil, HSG B
2.000
87
Weighted Average
1.860
93.00% Pervious Area
0.140
7.00% Impervious Area
Tc
Length
Slope
Velocity Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec) (cfs)
12.2
100
0.0270
0.14
Sheet Flow,
n= 0.240 P2= 3.45"
1.2
322
0.0712
4.30
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
13.4 422 Total
Subcatchment 1S: Pre -development Area
Hydrograph
—
I --I
—
—I --I——7—T—r—r—I--I—;-7-7—T—r—r—I--I--I-7—;—T—T—;—;—I--I--I7 ———r—
r—r—I-
0.85.85—I--I--I---+—+—+———I--I—+——+—+——---I--I———+—+———I--I---—+—+—�—�—�
O 8 0.78 cfs I I I I I I I I I I I I I I I
0.75 I II ----- — — — —IL ---- LI— LI — — — — ------ JI — — — — — IL ------ — — — L —L
---------------------------------------------------------------
07 6,he
'— —' — —' — —' —'
I I �-�-T-7-�-I--I-�-�-7-T-r-7-� -I- I-�-,-T-T-�-�-I--I- I--1-_T-7-r-7-,
0.65- 1--Jn-,6-hr WQV Rai'l"fa n I .0'0''
-----+-+-+-+-+----+-+-+-+-+-r-I--I-
0.6--I--I- - - - - -I--I- - - -+- ----I--I- - -+-F' ufl tq i ' aq
0.55 Run off'IVot'ume=6.b'1t'I-af
,I II IIIIIIIIIIIIIIIIIII
w 0.5--'--'- - -' -'-------'--'- -' -' -'-----'--
0.45 Ruhbff Depth "G.22"
—I— —I— r — T — Y — T — r — r — I— —I — —I — T — T — T — T — r — r —I— —I --II — T — T—�.,r— r — r — I
0 0.4-----+-+-+-+-+----+-+-+-+-+-+---I--I- - -+-+- Flgw-'�errJth-,4Z21-
0.35
--1--1-1-1-1-L-L-1--1-J-J-1-1-L-L-�--�--�-J-�-1-1-L-L-�--�- r� 3L4
,I I IIIIIIIIIIIIIIIIIIIIIIIIII I r�'N�
0.3
0.25
-----7-7—T—T-7----7-7-7—T—T-7—I----7-7—T—T-7-7------7-7-7—r-7—I
02
r-I--I-+-+-+-r-r-I--I-+-+-+-+-r-r-r-I--I-+-+-+-+-r-r-r-I--I-+-+-+-r-r-r
0.15-'-L-----L-1--1-J-J-1-L-L---------1-L-L-L----L----�-L-L
0.1
0.05
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)
■ Runoff

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 5
Hydrograph for Subcatchment 1S: Pre -development Area
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.12
0.00
0.00
3.00
0.73
0.10
0.55
4.00
0.88
0.16
0.10
5.00
0.95
0.20
0.06
6.00
1.00
0.22
0.05
7.00
1.00
0.22
0.00
8.00
1.00
0.22
0.00
9.00
1.00
0.22
0.00
10.00
1.00
0.22
0.00
11.00
1.00
0.22
0.00
12.00
1.00
0.22
0.00
13.00
1.00
0.22
0.00
14.00
1.00
0.22
0.00
15.00
1.00
0.22
0.00
16.00
1.00
0.22
0.00
17.00
1.00
0.22
0.00
18.00
1.00
0.22
0.00
19.00
1.00
0.22
0.00
20.00
1.00
0.22
0.00
21.00
1.00
0.22
0.00
22.00
1.00
0.22
0.00
23.00
1.00
0.22
0.00
24.00
1.00
0.22
0.00
25.00
1.00
0.22
0.00
26.00
1.00
0.22
0.00
27.00
1.00
0.22
0.00
28.00
1.00
0.22
0.00
29.00
1.00
0.22
0.00
30.00
1.00
0.22
0.00
31.00
1.00
0.22
0.00
32.00
1.00
0.22
0.00
33.00
1.00
0.22
0.00
34.00
1.00
0.22
0.00
35.00
1.00
0.22
0.00
36.00
1.00
0.22
0.00
37.00
1.00
0.22
0.00
38.00
1.00
0.22
0.00
39.00
1.00
0.22
0.00
40.00
1.00
0.22
0.00
41.00
1.00
0.22
0.00
42.00
1.00
0.22
0.00
43.00
1.00
0.22
0.00
44.00
1.00
0.22
0.00
45.00
1.00
0.22
0.00
46.00
1.00
0.22
0.00
47.00
1.00
0.22
0.00
48.00
1.00
0.22
0.00
49.00
1.00
0.22
0.00
50.00
1.00
0.22
0.00
51.00
1.00
0.22
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
1.00
0.22
0.00
53.00
1.00
0.22
0.00
54.00
1.00
0.22
0.00
55.00
1.00
0.22
0.00
56.00
1.00
0.22
0.00
57.00
1.00
0.22
0.00
58.00
1.00
0.22
0.00
59.00
1.00
0.22
0.00
60.00
1.00
0.22
0.00
61.00
1.00
0.22
0.00
62.00
1.00
0.22
0.00
63.00
1.00
0.22
0.00
64.00
1.00
0.22
0.00
65.00
1.00
0.22
0.00
66.00
1.00
0.22
0.00
67.00
1.00
0.22
0.00
68.00
1.00
0.22
0.00
69.00
1.00
0.22
0.00
70.00
1.00
0.22
0.00
71.00
1.00
0.22
0.00
72.00
1.00
0.22
0.00

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 2S: Post -development to Basin
Runoff = 0.37 cfs @ 3.04 hrs, Volume= 0.015 af, Depth= 0.22"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 6-hr 1-in 6-hr WQv Rainfall=1.00"
Area (ac) CN
Description
0.070 98
Paved parking, HSG B
0.740 86
Fallow, bare soil, HSG B
0.810 87
Weighted Average
0.740
91.36% Pervious Area
0.070
8.64% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
10.0
Direct Entry, User
Subcatchment 2S: Post -development to Basin
Hydrograph
0.4
--------+-+-+-+-+----+-+-+-+-+-r------+-+-+-+-r-r------+-+-+-+-+-i-
0.38
-I-7-+-+-r----1-1-T-+-+-T------1-1-+-+-r-r
---I--I- -7-fie I�
0.37
cfs
0.36
_I
- T
- T-T -
T-' ---'i-
-
-T-T-T-T-T---'i-
-- T-T -T -'-----'i- -_ y-r P e-i
0.34
0.32
0.3
------
- -1-i-
- - -
-L-L----J-J-i-T-L-L-----"fi
----------
- -
- ---
1 1
n � h _ � _F�a'ir f f1=1LO0'L
0.28
------
-1-L-L-L----J-J-i-T-L-L------J-
-L unIff krI1=0-$a0-aq-
0.26
w 0.24
0.22
-+-+-+-+-+-+-+----+-+-+-+-+-+-++-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+
,-Y-+-+-Y-I
Y-,-
Y-+-Y-I
-,-,-+-+Ruhbff D"thrO.2Z"
0 0.2
----7-1-r-r-'r----I-I-T-7-r-r-'r----I-,-T-r-r-'r----�����+�+
� 1
�- �-
a 0.18
0.16
--I-
--------+-+-r-r_---
-�- -'I -'I -'I ------ - - ------
0.14
--'--'--'--'-'--'--'--'--'--'--'--'--'-'--'--'--'--'--------------------------'--'-
0.12
--'--'--'--'-'--'--'--'--'--'--'--'--'-'--'--'--'--'--------------------------'--'-
0.1
-----
- -+-+-
----
-
-
-+-+-
------
- -+-+- - ------ - -+-+- --
0.08
-----+-+-+-+-+----+-+-+-+-+-+------+-+-+-+-+-+------+-+-+-+-+--
0.06+-Y-Y------Y-Y-Y-Y-Y-I-
0.04
' I
--'i-
--r-r-'r---'i-7-
-7-7-r-r-'r---'i-
--rt-r-r-'r-----'i- - -r-r-' 4
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)
■ Runoff

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 7
Hydrograph for Subcatchment 2S: Post -development to Basin
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.12
0.00
0.00
3.00
0.73
0.10
0.33
4.00
0.88
0.16
0.04
5.00
0.95
0.20
0.02
6.00
1.00
0.22
0.02
7.00
1.00
0.22
0.00
8.00
1.00
0.22
0.00
9.00
1.00
0.22
0.00
10.00
1.00
0.22
0.00
11.00
1.00
0.22
0.00
12.00
1.00
0.22
0.00
13.00
1.00
0.22
0.00
14.00
1.00
0.22
0.00
15.00
1.00
0.22
0.00
16.00
1.00
0.22
0.00
17.00
1.00
0.22
0.00
18.00
1.00
0.22
0.00
19.00
1.00
0.22
0.00
20.00
1.00
0.22
0.00
21.00
1.00
0.22
0.00
22.00
1.00
0.22
0.00
23.00
1.00
0.22
0.00
24.00
1.00
0.22
0.00
25.00
1.00
0.22
0.00
26.00
1.00
0.22
0.00
27.00
1.00
0.22
0.00
28.00
1.00
0.22
0.00
29.00
1.00
0.22
0.00
30.00
1.00
0.22
0.00
31.00
1.00
0.22
0.00
32.00
1.00
0.22
0.00
33.00
1.00
0.22
0.00
34.00
1.00
0.22
0.00
35.00
1.00
0.22
0.00
36.00
1.00
0.22
0.00
37.00
1.00
0.22
0.00
38.00
1.00
0.22
0.00
39.00
1.00
0.22
0.00
40.00
1.00
0.22
0.00
41.00
1.00
0.22
0.00
42.00
1.00
0.22
0.00
43.00
1.00
0.22
0.00
44.00
1.00
0.22
0.00
45.00
1.00
0.22
0.00
46.00
1.00
0.22
0.00
47.00
1.00
0.22
0.00
48.00
1.00
0.22
0.00
49.00
1.00
0.22
0.00
50.00
1.00
0.22
0.00
51.00
1.00
0.22
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
1.00
0.22
0.00
53.00
1.00
0.22
0.00
54.00
1.00
0.22
0.00
55.00
1.00
0.22
0.00
56.00
1.00
0.22
0.00
57.00
1.00
0.22
0.00
58.00
1.00
0.22
0.00
59.00
1.00
0.22
0.00
60.00
1.00
0.22
0.00
61.00
1.00
0.22
0.00
62.00
1.00
0.22
0.00
63.00
1.00
0.22
0.00
64.00
1.00
0.22
0.00
65.00
1.00
0.22
0.00
66.00
1.00
0.22
0.00
67.00
1.00
0.22
0.00
68.00
1.00
0.22
0.00
69.00
1.00
0.22
0.00
70.00
1.00
0.22
0.00
71.00
1.00
0.22
0.00
72.00
1.00
0.22
0.00

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 4S: Post -development On -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 1.39 cfs @ 2.96 hrs, Volume= 0.045 af, Depth= 0.45"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 6-hr 1-in 6-hr WQv Rainfall=1.00"
Area (ac) CN
Description
0.700 98
Paved parking, HSG B
0.490 86
Fallow, bare soil, HSG B
1.190 93
Weighted Average
0.490
41.18% Pervious Area
0.700
58.82% Impervious Area
Tc Length
Slope Velocity Capacity Description
(min) (feet)
(ft/ft) (ft/sec) (cfs)
5.0
Direct Entry, User
Subcatchment 4S: Post -development On -site
Hyd rog raph
� � �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I ❑Runoff
1.39 cfs
Type 11
6=1hr
1-in 6-hr'�WQv'� Rainfaill.l�.00"`
-- T -T -T- T -T - I
T- RunaffATrea='f.190 a
1 I
N Runoff V61ume=0.045'�af
3 Rurioffl aehth=* 4;5"
0
LL Td='5.0 Im'iri
CN=93
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 9
Hydrograph for Subcatchment 4S: Post -development On -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.12
0.00
0.00
3.00
0.73
0.25
1.25
4.00
0.88
0.36
0.08
5.00
0.95
0.41
0.05
6.00
1.00
0.45
0.04
7.00
1.00
0.45
0.00
8.00
1.00
0.45
0.00
9.00
1.00
0.45
0.00
10.00
1.00
0.45
0.00
11.00
1.00
0.45
0.00
12.00
1.00
0.45
0.00
13.00
1.00
0.45
0.00
14.00
1.00
0.45
0.00
15.00
1.00
0.45
0.00
16.00
1.00
0.45
0.00
17.00
1.00
0.45
0.00
18.00
1.00
0.45
0.00
19.00
1.00
0.45
0.00
20.00
1.00
0.45
0.00
21.00
1.00
0.45
0.00
22.00
1.00
0.45
0.00
23.00
1.00
0.45
0.00
24.00
1.00
0.45
0.00
25.00
1.00
0.45
0.00
26.00
1.00
0.45
0.00
27.00
1.00
0.45
0.00
28.00
1.00
0.45
0.00
29.00
1.00
0.45
0.00
30.00
1.00
0.45
0.00
31.00
1.00
0.45
0.00
32.00
1.00
0.45
0.00
33.00
1.00
0.45
0.00
34.00
1.00
0.45
0.00
35.00
1.00
0.45
0.00
36.00
1.00
0.45
0.00
37.00
1.00
0.45
0.00
38.00
1.00
0.45
0.00
39.00
1.00
0.45
0.00
40.00
1.00
0.45
0.00
41.00
1.00
0.45
0.00
42.00
1.00
0.45
0.00
43.00
1.00
0.45
0.00
44.00
1.00
0.45
0.00
45.00
1.00
0.45
0.00
46.00
1.00
0.45
0.00
47.00
1.00
0.45
0.00
48.00
1.00
0.45
0.00
49.00
1.00
0.45
0.00
50.00
1.00
0.45
0.00
51.00
1.00
0.45
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
1.00
0.45
0.00
53.00
1.00
0.45
0.00
54.00
1.00
0.45
0.00
55.00
1.00
0.45
0.00
56.00
1.00
0.45
0.00
57.00
1.00
0.45
0.00
58.00
1.00
0.45
0.00
59.00
1.00
0.45
0.00
60.00
1.00
0.45
0.00
61.00
1.00
0.45
0.00
62.00
1.00
0.45
0.00
63.00
1.00
0.45
0.00
64.00
1.00
0.45
0.00
65.00
1.00
0.45
0.00
66.00
1.00
0.45
0.00
67.00
1.00
0.45
0.00
68.00
1.00
0.45
0.00
69.00
1.00
0.45
0.00
70.00
1.00
0.45
0.00
71.00
1.00
0.45
0.00
72.00
1.00
0.45
0.00

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 6S: Post -development Off -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.00 cfs @ 6.00 hrs, Volume= 0.000 af, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 6-hr 1-in 6-hr WQv Rainfall=1.00"
Area (ac) CN Description
1.320 69 50-75% Grass cover, Fair, HSG B
1.320 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, User
Subcatchment 6S: Post -development Off -site
Hydrograph
0.003 ■Runoff
0.00 cfs -i L L—L-----1--i L L—L------L-1—L—L------L-1-1—L-1_-1--1—L-1—L—`L-
0.002 tylpe II
—I—————------———------———------———---I--I—T-1—I—
0.002 6,h11
0.002 1-i'1n '16-hr,' WQv Ra'1in'1fa'111=1'1.QO"
0.002 -1--t-t-t--t-t-t--t-t-t--Fupq rral_210 -
-1 ,-
T-r-'r-------I -T-r-----'I- T-T- �unolfV61I-Fe-O.b00raf
0.002 I I I I
N 1 1 1 1 1
— — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
0.001 Ruhdff Depth"G.00"
3 -'------------------------'--1_ i_ _ _i _1_ 1 r
a 0.001 Y- + n1i
-' - - ------'--'- - - ----'--'- - - ----'--'- - - -i---'--'- -
0.001 1 1 1 1 1 1 I
—I- —-1—L—L-------1—L-1-------1—L—L-------1-1—L-------1—L—L-
0.001
0.001
-I --t-t-r-1--1--1--t-t-r-r-1--1-t-t-t-r-r-1--1-t-t-t-r-r-1--1-t-t-t-r-
0.000 1 1 I I I 1 1 I I I 1 1 I I I 1 1 I I I 1 1
—1 —r—T—T—r------r—T—T—r------r—T—T—r------r—T—T—r------r—T—T—r-
0.000
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 11
Hydrograph for Subcatchment 6S: Post -development Off -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.12
0.00
0.00
3.00
0.73
0.00
0.00
4.00
0.88
0.00
0.00
5.00
0.95
0.00
0.00
6.00
1.00
0.00
0.00
7.00
1.00
0.00
0.00
8.00
1.00
0.00
0.00
9.00
1.00
0.00
0.00
10.00
1.00
0.00
0.00
11.00
1.00
0.00
0.00
12.00
1.00
0.00
0.00
13.00
1.00
0.00
0.00
14.00
1.00
0.00
0.00
15.00
1.00
0.00
0.00
16.00
1.00
0.00
0.00
17.00
1.00
0.00
0.00
18.00
1.00
0.00
0.00
19.00
1.00
0.00
0.00
20.00
1.00
0.00
0.00
21.00
1.00
0.00
0.00
22.00
1.00
0.00
0.00
23.00
1.00
0.00
0.00
24.00
1.00
0.00
0.00
25.00
1.00
0.00
0.00
26.00
1.00
0.00
0.00
27.00
1.00
0.00
0.00
28.00
1.00
0.00
0.00
29.00
1.00
0.00
0.00
30.00
1.00
0.00
0.00
31.00
1.00
0.00
0.00
32.00
1.00
0.00
0.00
33.00
1.00
0.00
0.00
34.00
1.00
0.00
0.00
35.00
1.00
0.00
0.00
36.00
1.00
0.00
0.00
37.00
1.00
0.00
0.00
38.00
1.00
0.00
0.00
39.00
1.00
0.00
0.00
40.00
1.00
0.00
0.00
41.00
1.00
0.00
0.00
42.00
1.00
0.00
0.00
43.00
1.00
0.00
0.00
44.00
1.00
0.00
0.00
45.00
1.00
0.00
0.00
46.00
1.00
0.00
0.00
47.00
1.00
0.00
0.00
48.00
1.00
0.00
0.00
49.00
1.00
0.00
0.00
50.00
1.00
0.00
0.00
51.00
1.00
0.00
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
1.00
0.00
0.00
53.00
1.00
0.00
0.00
54.00
1.00
0.00
0.00
55.00
1.00
0.00
0.00
56.00
1.00
0.00
0.00
57.00
1.00
0.00
0.00
58.00
1.00
0.00
0.00
59.00
1.00
0.00
0.00
60.00
1.00
0.00
0.00
61.00
1.00
0.00
0.00
62.00
1.00
0.00
0.00
63.00
1.00
0.00
0.00
64.00
1.00
0.00
0.00
65.00
1.00
0.00
0.00
66.00
1.00
0.00
0.00
67.00
1.00
0.00
0.00
68.00
1.00
0.00
0.00
69.00
1.00
0.00
0.00
70.00
1.00
0.00
0.00
71.00
1.00
0.00
0.00
72.00
1.00
0.00
0.00

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 12
Summary for Pond 3P: Sand Filter
[81] Warning: Exceeded Pond 5P by 1.42' @ 6.25 hrs
Inflow Area = 3.320 ac, 23.19% Impervious, Inflow Depth = 0.20" for 1-in 6-hr WQv event
Inflow = 1.18 cfs @ 2.99 hrs, Volume= 0.054 of
Outflow = 0.04 cfs @ 6.07 hrs, Volume= 0.054 af, Atten= 97%, Lag= 184.8 min
Primary = 0.04 cfs @ 6.07 hrs, Volume= 0.054 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 893.87' @ 6.07 hrs Surf.Area= 1,602 sf Storage= 2,044 cf
Plug -Flow detention time= 821.8 min calculated for 0.054 of (100% of inflow)
Center -of -Mass det. time= 823.8 min ( 1,039.6 - 215.9 )
Volume Invert
#1 892.00'
Description
4,118 cf Custom Stage Data (Prismatic)-isted below
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
892.00
396
0 0
892.30
777
176 176
893.00
1,110
660 836
894.00
1,678
1,394 2,230
895.00
2,098
1,888 4,118
Device Routing
Invert
Outlet Devices
#1 Primary
888.06'
15.0" Round Culvert
L= 87.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 888.06' / 880.56' S= 0.0858'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 1.23 sf
#2 Device 1
892.00'
Special & User -Defined
Elev. (feet) 892.00 893.00 894.00 895.00
Disch. (cfs) 0.000 0.022 0.028 0.034
#3 Device 1
893.84'
11.4" W x 1.9" H Vert. Orifice/Grate C= 0.600
#4 Device 1
894.44'
35.6" x 35.4" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Primary
894.75'
28.0' long Sharp -Crested Rectangular Weir End Contraction(s)
Primary OutFlow Max=0.04 cfs @ 6.07 hrs HW=893.87' (Free Discharge)
1=Culvert (Passes 0.04 cfs of 16.81 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.03 cfs)
3=Orifice/Grate (Orifice Controls 0.01 cfs @ 0.52 fps)
4=Orifice/Grate ( Controls 0.00 cfs)
=Sharp -Crested Rectangular Weir( Controls 0.00 cfs)

6028_Sand Filter
Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 13
N
U
Pond 3P: Sand Filter
Hyd rog raph
❑ Inflow
❑ Primary
Inflow IArea=3.1320 lal&
-,- i - i -r-II -I--I- i - i -I-I--I-,- i - i - i -II-I--IRe�;a�;k'; �rew�$��•��'
Stbr gge='2�.044,', efl
I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
416
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 14
Hydrograph for Pond 3P: Sand Filter
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
892.00
0.00
2.50
0.01
5
892.01
0.00
5.00
0.08
1,900
893.76
0.03
7.50
0.00
1,906
893.77
0.03
10.00
0.00
1,671
893.60
0.03
12.50
0.00
1,445
893.44
0.02
15.00
0.00
1,228
893.28
0.02
17.50
0.00
1,018
893.13
0.02
20.00
0.00
817
892.98
0.02
22.50
0.00
642
892.79
0.02
25.00
0.00
501
892.64
0.01
27.50
0.00
386
892.52
0.01
30.00
0.00
292
892.42
0.01
32.50
0.00
217
892.34
0.01
35.00
0.00
156
892.27
0.01
37.50
0.00
111
892.19
0.00
40.00
0.00
79
892.14
0.00
42.50
0.00
57
892.10
0.00
45.00
0.00
40
892.07
0.00
47.50
0.00
29
892.05
0.00
50.00
0.00
21
892.04
0.00
52.50
0.00
15
892.03
0.00
55.00
0.00
10
892.02
0.00
57.50
0.00
7
892.01
0.00
60.00
0.00
5
892.01
0.00
62.50
0.00
4
892.01
0.00
65.00
0.00
3
892.00
0.00
67.50
0.00
2
892.00
0.00
70.00
0.00
1
892.00
0.00

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 15
Elevation Primary
(feet)
(cfs)
892.00
0.00
892.02
0.00
892.04
0.00
892.06
0.00
892.08
0.00
892.10
0.00
892.12
0.00
892.14
0.00
892.16
0.00
892.18
0.00
892.20
0.00
892.22
0.00
892.24
0.01
892.26
0.01
892.28
0.01
892.30
0.01
892.32
0.01
892.34
0.01
892.36
0.01
892.38
0.01
892.40
0.01
892.42
0.01
892.44
0.01
892.46
0.01
892.48
0.01
892.50
0.01
892.52
0.01
892.54
0.01
892.56
0.01
892.58
0.01
892.60
0.01
892.62
0.01
892.64
0.01
892.66
0.01
892.68
0.01
892.70
0.02
892.72
0.02
892.74
0.02
892.76
0.02
892.78
0.02
892.80
0.02
892.82
0.02
892.84
0.02
892.86
0.02
892.88
0.02
892.90
0.02
892.92
0.02
892.94
0.02
892.96
0.02
892.98
0.02
893.00
0.02
893.02
0.02
Stage -Discharge for Pond 3P: Sand Filter
Elevation Primary
(feet)
(cfs)
893.04
0.02
893.06
0.02
893.08
0.02
893.10
0.02
893.12
0.02
893.14
0.02
893.16
0.02
893.18
0.02
893.20
0.02
893.22
0.02
893.24
0.02
893.26
0.02
893.28
0.02
893.30
0.02
893.32
0.02
893.34
0.02
893.36
0.02
893.38
0.02
893.40
0.02
893.42
0.02
893.44
0.02
893.46
0.02
893.48
0.02
893.50
0.03
893.52
0.03
893.54
0.03
893.56
0.03
893.58
0.03
893.60
0.03
893.62
0.03
893.64
0.03
893.66
0.03
893.68
0.03
893.70
0.03
893.72
0.03
893.74
0.03
893.76
0.03
893.78
0.03
893.80
0.03
893.82
0.03
893.84
0.03
893.86
0.04
893.88
0.05
893.90
0.07
893.92
0.10
893.94
0.12
893.96
0.15
893.98
0.19
894.00
0.22
894.02
0.25
894.04
0.28
894.06
0.30
Elevation Primary
(feet)
(cfs)
894.08
0.32
894.10
0.33
894.12
0.35
894.14
0.37
894.16
0.38
894.18
0.40
894.20
0.41
894.22
0.43
894.24
0.44
894.26
0.45
894.28
0.46
894.30
0.48
894.32
0.49
894.34
0.50
894.36
0.51
894.38
0.52
894.40
0.53
894.42
0.54
894.44
0.55
894.46
0.67
894.48
0.88
894.50
1.15
894.52
1.47
894.54
1.83
894.56
2.22
894.58
2.65
894.60
3.11
894.62
3.59
894.64
4.11
894.66
4.65
894.68
5.21
894.70
5.80
894.72
6.41
894.74
7.05
894.76
7.79
894.78
8.85
894.80
10.09
894.82
11.48
894.84
12.99
894.86
14.61
894.88
16.32
894.90
18.14
894.92
20.04
894.94
22.02
894.96
24.08
894.98
26.22
895.00
28.43

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 16
Stage -Area -Storage for Pond 3P: Sand Filter
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
892.00
396
0
892.05
459
29
892.10
523
59
892.15
586
88
892.20
650
117
892.25
713
147
892.30
777
176
892.35
801
223
892.40
825
270
892.45
848
317
892.50
872
365
892.55
896
412
892.60
920
459
892.65
943
506
892.70
967
553
892.75
991
601
892.80
1,015
648
892.85
1,039
695
892.90
1,062
742
892.95
1,086
789
893.00
1,110
836
893.05
1,138
906
893.10
1,167
976
893.15
1,195
1,045
893.20
1,224
1,115
893.25
1,252
1,185
893.30
1,280
1,255
893.35
1,309
1,324
893.40
1,337
1,394
893.45
1,366
1,464
893.50
1,394
1,533
893.55
1,422
1,603
893.60
1,451
1,673
893.65
1,479
1,742
893.70
1,508
1,812
893.75
1,536
1,882
893.80
1,564
1,952
893.85
1,593
2,021
893.90
1,621
2,091
893.95
1,650
2,161
894.00
1,678
2,230
894.05
1,699
2,325
894.10
1,720
2,419
894.15
1,741
2,514
894.20
1,762
2,608
894.25
1,783
2,702
894.30
1,804
2,797
894.35
1,825
2,891
894.40
1,846
2,986
894.45
1,867
3,080
894.50
1,888
3,174
894.55
1,909
3,269
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
894.60
1,930
3,363
894.65
1,951
3,458
894.70
1,972
3,552
894.75
1,993
3,646
894.80
2,014
3,741
894.85
2,035
3,835
894.90
2,056
3,930
894.95
2,077
4,024
895.00
2,098
4,118

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 17
Summary for Pond 5P: Flow Splitter
[57] Hint: Peaked at 892.97' (Flood elevation advised)
Inflow Area = 2.510 ac, 27.89% Impervious, Inflow Depth = 0.21" for 1-in 6-hr WQv event
Inflow =
1.39 cfs @
2.96 hrs,
Volume=
0.045 of
Outflow =
1.39 cfs @
2.96 hrs,
Volume=
0.045 af, Atten= 0%, Lag= 0.0 min
Primary =
0.90 cfs @
2.96 hrs,
Volume=
0.039 of
Secondary =
0.49 cfs @
2.96 hrs,
Volume=
0.006 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 892.97' @ 2.96 hrs
Device Routina Invert Outlet Devices
#1 Primary 892.43' 12.0" Round Culvert
L= 26.7' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.43' / 892.23' S= 0.0075'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf
#2 Secondary 892.35' 24.0" Round Culvert
L= 129.4' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.35' / 880.00' S= 0.0954'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 3.14 sf
#3 Device 2 892.75' 1.5' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=0.88 cfs @ 2.96 hrs HW=892.96' (Free Discharge)
L1=Culvert (Barrel Controls 0.88 cfs @ 3.00 fps)
Secondary OutFlow Max=0.47 cfs @ 2.96 hrs HW=892.96' (Free Discharge)
L2=Culvert (Passes 0.47 cfs of 2.17 cfs potential flow)
L3=Sharp -Crested Rectangular Weir(Weir Controls 0.47 cfs @ 1.51 fps)

6028_Sand Filter
Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 18
Pond 5P: Flow Splitter
Hyd rog raph
❑ Inflow
1.39 cfs Outflow1.39 cfs ❑ Primary
Inflow IAroa-2.51 O laic' Secondary
IP!elalllklll el ev=$92.07'III
1 0.90 cfs
N I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
V I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
3 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
LL
0.49 cfs I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
. . . . . . . .
0 2 4 6 8 101214 1618 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 19
Hydrograph for Pond 5P: Flow Splitter
Time
Inflow
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
892.35
0.00
0.00
0.00
2.50
0.01
892.49
0.01
0.01
0.00
5.00
0.05
892.55
0.05
0.05
0.00
7.50
0.00
892.43
0.00
0.00
0.00
10.00
0.00
892.43
0.00
0.00
0.00
12.50
0.00
892.43
0.00
0.00
0.00
15.00
0.00
892.43
0.00
0.00
0.00
17.50
0.00
892.43
0.00
0.00
0.00
20.00
0.00
892.43
0.00
0.00
0.00
22.50
0.00
892.43
0.00
0.00
0.00
25.00
0.00
892.43
0.00
0.00
0.00
27.50
0.00
892.43
0.00
0.00
0.00
30.00
0.00
892.43
0.00
0.00
0.00
32.50
0.00
892.43
0.00
0.00
0.00
35.00
0.00
892.43
0.00
0.00
0.00
37.50
0.00
892.43
0.00
0.00
0.00
40.00
0.00
892.43
0.00
0.00
0.00
42.50
0.00
892.43
0.00
0.00
0.00
45.00
0.00
892.43
0.00
0.00
0.00
47.50
0.00
892.43
0.00
0.00
0.00
50.00
0.00
892.43
0.00
0.00
0.00
52.50
0.00
892.43
0.00
0.00
0.00
55.00
0.00
892.43
0.00
0.00
0.00
57.50
0.00
892.43
0.00
0.00
0.00
60.00
0.00
892.43
0.00
0.00
0.00
62.50
0.00
892.43
0.00
0.00
0.00
65.00
0.00
892.43
0.00
0.00
0.00
67.50
0.00
892.43
0.00
0.00
0.00
70.00
0.00
892.43
0.00
0.00
0.00

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 20
Stage -Discharge for Pond 5P: Flow Splitter
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
892.35
0.00
0.00
0.00
892.37
0.00
0.00
0.00
892.39
0.00
0.00
0.00
892.41
0.00
0.00
0.00
892.43
0.00
0.00
0.00
892.45
0.00
0.00
0.00
892.47
0.01
0.01
0.00
892.49
0.01
0.01
0.00
892.51
0.02
0.02
0.00
892.53
0.04
0.04
0.00
892.55
0.05
0.05
0.00
892.57
0.07
0.07
0.00
892.59
0.09
0.09
0.00
892.61
0.12
0.12
0.00
892.63
0.15
0.15
0.00
892.65
0.17
0.17
0.00
892.67
0.21
0.21
0.00
892.69
0.24
0.24
0.00
892.71
0.28
0.28
0.00
892.73
0.31
0.31
0.00
892.75
0.35
0.35
0.00
892.77
0.41
0.40
0.01
892.79
0.48
0.44
0.04
892.81
0.56
0.48
0.07
892.83
0.64
0.53
0.11
892.85
0.73
0.58
0.15
892.87
0.83
0.63
0.20
892.89
0.93
0.68
0.25
892.91
1.04
0.73
0.31
892.93
1.15
0.79
0.37
892.95
1.27
0.84
0.43
892.97
1.39
0.90
0.49
892.99
1.52
0.96
0.56
893.01
1.64
1.02
0.63
893.03
1.78
1.08
0.70
893.05
1.91
1.14
0.77
893.07
2.05
1.20
0.85
893.09
2.19
1.26
0.93
893.11
2.33
1.32
1.01
893.13
2.48
1.39
1.09
893.15
2.63
1.45
1.17
893.17
2.78
1.52
1.26
893.19
2.93
1.58
1.35
893.21
3.09
1.65
1.44
893.23
3.24
1.71
1.53
893.25
3.40
1.78
1.62
893.27
3.56
1.85
1.71
893.29
3.72
1.91
1.81
893.31
3.88
1.98
1.90
893.33
4.05
2.05
2.00
893.35
4.21
2.11
2.10
893.37
4.37
2.18
2.20
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
893.39
4.54
2.24
2.30
893.41
4.71
2.31
2.40
893.43
4.87
2.37
2.50
893.45
5.04
2.44
2.60
893.47
5.21
2.50
2.71
893.49
5.37
2.56
2.81
893.51
5.54
2.62
2.92
893.53
5.70
2.68
3.03
893.55
5.87
2.73
3.14
893.57
6.03
2.79
3.24
893.59
6.20
2.84
3.35
893.61
6.36
2.89
3.46
893.63
6.51
2.94
3.57
893.65
6.67
2.98
3.69
893.67
6.82
3.02
3.80
893.69
6.97
3.06
3.91
893.71
7.11
3.09
4.02
893.73
7.25
3.11
4.14
893.75
7.37
3.12
4.25
893.77
7.48
3.11
4.37
893.79
7.65
3.17
4.48
893.81
7.82
3.23
4.60
893.83
7.99
3.28
4.71
893.85
8.16
3.34
4.83
893.87
8.33
3.39
4.95
893.89
8.50
3.44
5.06
893.91
8.67
3.49
5.18
893.93
8.84
3.54
5.30
893.95
9.01
3.59
5.42
893.97
9.18
3.64
5.53
893.99
9.35
3.69
5.65
894.01
9.51
3.74
5.77
894.03
9.68
3.79
5.89
894.05
9.85
3.84
6.01
894.07
10.01
3.88
6.13
894.09
10.18
3.93
6.25
894.11
10.34
3.97
6.37
894.13
10.51
4.02
6.49
894.15
10.67
4.06
6.61
894.17
10.83
4.11
6.73
894.19
11.00
4.15
6.85
894.21
11.16
4.19
6.97
894.23
11.32
4.24
7.09
894.25
11.49
4.28
7.21
894.27
11.65
4.32
7.33
894.29
11.81
4.36
7.45
894.31
11.97
4.40
7.57
894.33
12.13
4.44
7.69
894.35
12.29
4.48
7.81

6028_Sand Filter Type 11 6-hr 1-in 6-hr WQv Rainfall=1.00"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 21
Elevation
Storage
(feet)
(cubic -feet)
892.35
0
892.37
0
892.39
0
892.41
0
892.43
0
892.45
0
892.47
0
892.49
0
892.51
0
892.53
0
892.55
0
892.57
0
892.59
0
892.61
0
892.63
0
892.65
0
892.67
0
892.69
0
892.71
0
892.73
0
892.75
0
892.77
0
892.79
0
892.81
0
892.83
0
892.85
0
892.87
0
892.89
0
892.91
0
892.93
0
892.95
0
892.97
0
892.99
0
893.01
0
893.03
0
893.05
0
893.07
0
893.09
0
893.11
0
893.13
0
893.15
0
893.17
0
893.19
0
893.21
0
893.23
0
893.25
0
893.27
0
893.29
0
893.31
0
893.33
0
893.35
0
893.37
0
Stage -Area -Storage for Pond 5P: Flow Splitter
Elevation
Storage
(feet)
(cubic -feet)
893.39
0
893.41
0
893.43
0
893.45
0
893.47
0
893.49
0
893.51
0
893.53
0
893.55
0
893.57
0
893.59
0
893.61
0
893.63
0
893.65
0
893.67
0
893.69
0
893.71
0
893.73
0
893.75
0
893.77
0
893.79
0
893.81
0
893.83
0
893.85
0
893.87
0
893.89
0
893.91
0
893.93
0
893.95
0
893.97
0
893.99
0
894.01
0
894.03
0
894.05
0
894.07
0
894.09
0
894.11
0
894.13
0
894.15
0
894.17
0
894.19
0
894.21
0
894.23
0
894.25
0
894.27
0
894.29
0
894.31
0
894.33
0
894.35
0

1S
Pre -development Area
S4
Reach on L
ink
4S
Post-dev lopment
On site
2S A 5P
O
Post -development to Sand Filter Flow plitter
Basin
6S
Post -development
Off -site

6028 Sand Filter
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 2
Notes Listing (all nodes)
Line# Node Notes
Number
is 50% woods & 50% pasture

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 3
Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment1S: Pre-developmentArea Runoff Area=2.000 ac 7.00% Impervious Runoff Depth=1.60"
Flow Length=422' Tc=13.4 min CN=87 Runoff=4.33 cfs 0.267 of
Subcatchment2S: Post-developmentto Runoff Area=0.810 ac 8.64% Impervious Runoff Depth=0.40"
Tc=10.0 min CN=64 Runoff=0.37 cfs 0.027 of
Subcatchment4S: Post -development Runoff Area=1.190 ac 58.82% Impervious Runoff Depth=1.32"
Tc=5.0 min CN=83 Runoff=2.83 cfs 0.131 of
Subcatchment6S: Post -development Runoff Area=1.320 ac 0.00% Impervious Runoff Depth=0.59"
Tc=5.0 min CN=69 Runoff=1.27 cfs 0.064 of
Pond 3P: Sand Filter Peak Elev=894.22' Storage=2,641 cf Inflow=2.29 cfs 0.189 of
Outflow=0.42 cfs 0.188 of
Pond 5P: Flow Splitter Peak Elev=893.34' Inflow=4.09 cfs 0.195 of
Primary=2.06 cfs 0.162 of Secondary=2.02 cfs 0.034 of Outflow=4.09 cfs 0.195 of
Total Runoff Area = 5.320 ac Runoff Volume = 0.489 of Average Runoff Depth = 1.10"
82.89% Pervious = 4.410 ac 17.11% Impervious = 0.910 ac

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 1S: Pre -development Area
50% woods & 50% pasture
Runoff = 4.33 cfs @ 12.05 hrs, Volume= 0.267 af, Depth= 1.60"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-yr CPv Rainfall=2.84"
Area (ac)
CN
Description
0.140
98
Paved parking, HSG B
1.860
86
Fallow, bare soil, HSG B
2.000
87
Weighted Average
1.860
93.00% Pervious Area
0.140
7.00% Impervious Area
Tc
Length
Slope
Velocity Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec) (cfs)
12.2
100
0.0270
0.14
Sheet Flow,
n= 0.240 P2= 3.45"
1.2
322
0.0712
4.30
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
13.4 422 Total
Subcatchment 1S: Pre -development Area
Hydrograph
�I �I �I � � � �I I�� �I �I I�� �I �I �I �I �I �I �I �I �I I�� I�� �I �I I�� �I �I I�� I�� �I �I �I �I �I �I ❑Runoff
4.33 cfs
T pip,
4 1 r r CPv �Rainfaill�2.'84 "
Ruhbff A'rda^2.000 Ad
3 t;jjofif'VO)t;Mq=0;26 j ;3f
w R6noff �DlePth�::1.160"
- -
'L 2
�TC=13.4 min
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 5
Hydrograph for Subcatchment 1S: Pre -development Area
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.14
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.23
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.42
0.01
0.02
10.00
0.51
0.03
0.05
11.00
0.67
0.07
0.12
12.00
1.88
0.82
3.86
13.00
2.19
1.06
0.33
14.00
2.33
1.17
0.19
15.00
2.42
1.25
0.15
16.00
2.50
1.31
0.12
17.00
2.56
1.36
0.10
18.00
2.62
1.41
0.09
19.00
2.66
1.45
0.08
20.00
2.70
1.48
0.07
21.00
2.74
1.51
0.06
22.00
2.77
1.54
0.06
23.00
2.81
1.57
0.06
24.00
2.84
1.60
0.05
25.00
2.84
1.60
0.00
26.00
2.84
1.60
0.00
27.00
2.84
1.60
0.00
28.00
2.84
1.60
0.00
29.00
2.84
1.60
0.00
30.00
2.84
1.60
0.00
31.00
2.84
1.60
0.00
32.00
2.84
1.60
0.00
33.00
2.84
1.60
0.00
34.00
2.84
1.60
0.00
35.00
2.84
1.60
0.00
36.00
2.84
1.60
0.00
37.00
2.84
1.60
0.00
38.00
2.84
1.60
0.00
39.00
2.84
1.60
0.00
40.00
2.84
1.60
0.00
41.00
2.84
1.60
0.00
42.00
2.84
1.60
0.00
43.00
2.84
1.60
0.00
44.00
2.84
1.60
0.00
45.00
2.84
1.60
0.00
46.00
2.84
1.60
0.00
47.00
2.84
1.60
0.00
48.00
2.84
1.60
0.00
49.00
2.84
1.60
0.00
50.00
2.84
1.60
0.00
51.00
2.84
1.60
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
2.84
1.60
0.00
53.00
2.84
1.60
0.00
54.00
2.84
1.60
0.00
55.00
2.84
1.60
0.00
56.00
2.84
1.60
0.00
57.00
2.84
1.60
0.00
58.00
2.84
1.60
0.00
59.00
2.84
1.60
0.00
60.00
2.84
1.60
0.00
61.00
2.84
1.60
0.00
62.00
2.84
1.60
0.00
63.00
2.84
1.60
0.00
64.00
2.84
1.60
0.00
65.00
2.84
1.60
0.00
66.00
2.84
1.60
0.00
67.00
2.84
1.60
0.00
68.00
2.84
1.60
0.00
69.00
2.84
1.60
0.00
70.00
2.84
1.60
0.00
71.00
2.84
1.60
0.00
72.00
2.84
1.60
0.00

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 2S: Post -development to Basin
Runoff = 0.37 cfs @ 12.05 hrs, Volume= 0.027 af, Depth= 0.40"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-yr CPv Rainfall=2.84"
Area (ac) CN Description
0.070 98 Paved parking, HSG B
0.740 61 >75% Grass cover, Good, HSG B
0.810 64 Weighted Average
0.740 91.36% Pervious Area
0.070 8.64% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, User
Subcatchment 2S: Post -development to Basin
Hydrograph
-r-r-1--1-+-+-+-r-r-1--1-+-+-+-+-r-r-r-1--1-+-+-+-+-r-r-r-1--1-+-+-+-r-r-r
' 1 1 1 1 I 1 11 11 11 1 1 1 11 11 11 1 1 1 1 1 1 1 1 1
0.4-11--11--1I--I— — —
T-T-r-r-T-11-T-T-T-T-r-r-i -1- 1-T-T-T-r-r-T-1--1- 1-T-T-r-r-T-i
0.38 1 1 1 1 0.37 cfs _ 11 11 1 1 1 1 1 1 1 11 11 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1 1 1
0.36-1--1--1--1- - - --1--1--1--1- - - - --1--1--1--------i-1�11r"--`��-
0.34 / 1-1--1--1--1- - 1--- 1--1--1--1--1--_ _ _ _ _1_ 1 � �^s6 6 ,�
0.32-1--1--1--1- - 1--- 1--1--1--1--1--1- - - 1--- 1--1--1--II ��� 11�r_R��n11_�����_
i t 1 1 1 11�1 1 1 1y��1y, 1 1 /1� 1 Al -11 1 1
0.3-1--1--1--1--i-L-L-1--1-J-J-1-1-L-L-1--1--1-f-/'-' eea"—W.81 V 4Ci11-
�1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 �
0.28-1--1--1--1- - -r- -1--1- - --+-r-r-1--1--1- - -+- -r--1--1--1- - -r-r- -1-
0.26-1--1--1--1--+-+-+-1--1-+-+-+-+-+-r-1--1 + y�y��'�./�� �/]� + +
f �" noff VIO" I"I' �1=11 _;AV_Af-
0.24--------r-r-r-1--1-Y-Y-Y-Y-r-r-r 1--1-Y-Y-r-r-r- r-1--1-Y-Y-r-r-r-r
w 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1n 1 1 * �^ y� 1 ��1
0.22-1--1--1--r-r-r-r-1--1-T-T-7-T-r-r-i-1--1-T-Aun 1©1epth�kJ�TFi�-1I
3 0.2-1--1--1--1 - r-r-T-1--1--1--1-T-T-r-r-i-1--1--1-T- T - r -1 1 -
1 1
a0.18-1--1--1-J - --1--1--1-J--1- - - --1--1--1--1- - - --1--11T1CT�-A1161_
,11111 11111111111111111111111111111
0.16-1--1--1--1-1--1--1--1--1--1--1--1--1-1--1--1--1--1--1--1-1--i-i-1--1--1--1--4-
1 I 1 1�.� 4
0.14-1--1--1--1 -1-L
1111--1--1--1--1-1--1--1--1--1--1--1-1--1--1--1--1--1--1--1----------
,1 1 1 1 1 11 1 10.12-J10.1- 0.08-+0.06-----I--I——Y—————------—————------———Y—Y-1-
0.04 I-T-T-T-T-r-r-i-11-T-T-T-r-r-T-111-T-T-r-r-T-n nn 1 1 1 1 1 1I I I I I 1 1 1 1 I I I I I 1 1 1 I I I I I 1
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)
■ Runoff

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 7
Hydrograph for Subcatchment 2S: Post -development to Basin
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.14
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.23
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.42
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.67
0.00
0.00
12.00
1.88
0.09
0.31
13.00
2.19
0.17
0.05
14.00
2.33
0.21
0.03
15.00
2.42
0.24
0.02
16.00
2.50
0.27
0.02
17.00
2.56
0.29
0.02
18.00
2.62
0.31
0.02
19.00
2.66
0.33
0.01
20.00
2.70
0.35
0.01
21.00
2.74
0.36
0.01
22.00
2.77
0.37
0.01
23.00
2.81
0.39
0.01
24.00
2.84
0.40
0.01
25.00
2.84
0.40
0.00
26.00
2.84
0.40
0.00
27.00
2.84
0.40
0.00
28.00
2.84
0.40
0.00
29.00
2.84
0.40
0.00
30.00
2.84
0.40
0.00
31.00
2.84
0.40
0.00
32.00
2.84
0.40
0.00
33.00
2.84
0.40
0.00
34.00
2.84
0.40
0.00
35.00
2.84
0.40
0.00
36.00
2.84
0.40
0.00
37.00
2.84
0.40
0.00
38.00
2.84
0.40
0.00
39.00
2.84
0.40
0.00
40.00
2.84
0.40
0.00
41.00
2.84
0.40
0.00
42.00
2.84
0.40
0.00
43.00
2.84
0.40
0.00
44.00
2.84
0.40
0.00
45.00
2.84
0.40
0.00
46.00
2.84
0.40
0.00
47.00
2.84
0.40
0.00
48.00
2.84
0.40
0.00
49.00
2.84
0.40
0.00
50.00
2.84
0.40
0.00
51.00
2.84
0.40
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
2.84
0.40
0.00
53.00
2.84
0.40
0.00
54.00
2.84
0.40
0.00
55.00
2.84
0.40
0.00
56.00
2.84
0.40
0.00
57.00
2.84
0.40
0.00
58.00
2.84
0.40
0.00
59.00
2.84
0.40
0.00
60.00
2.84
0.40
0.00
61.00
2.84
0.40
0.00
62.00
2.84
0.40
0.00
63.00
2.84
0.40
0.00
64.00
2.84
0.40
0.00
65.00
2.84
0.40
0.00
66.00
2.84
0.40
0.00
67.00
2.84
0.40
0.00
68.00
2.84
0.40
0.00
69.00
2.84
0.40
0.00
70.00
2.84
0.40
0.00
71.00
2.84
0.40
0.00
72.00
2.84
0.40
0.00

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 4S: Post -development On -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 2.83 cfs @ 11.96 hrs, Volume= 0.131 af, Depth= 1.32"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-yr CPv Rainfall=2.84"
Area (ac) CN Description
0.700 98 Paved parking, HSG B
0.490 61 >75% Grass cover, Good, HSG B
1.190 83 Weighted Average
0.490 41.18% Pervious Area
0.700 58.82% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, User
Subcatchment 4S: Post -development On -site
Hydrograph
-
r----T-T-T-T-T-T-Ir—r------T-T- T-T-T-r- Ir------T-T- T- T- T- r- Ir---- —II-T- ■Runoff
3 2.83 cfs
Type I'II 24-hrr
1 r r ICIPv IRainlfaill;=2.84"
Ruhbff A'rda^1.190 Ad
2 F't; jj0!ffy0'II ; M1Q='10 A $1 Of
w k6no f IDlept&:1.32"
3 IIII IIIIIIIIIIIIIIIIIIIII I I
TtT5.0 Min'
LL I I I I I I I I I I I I I I I I I I I I I I I I I I I I
--I--I- - -
1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 9
Hydrograph for Subcatchment 4S: Post -development On -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.14
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.23
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.42
0.00
0.00
10.00
0.51
0.01
0.01
11.00
0.67
0.03
0.05
12.00
1.88
0.62
2.50
13.00
2.19
0.83
0.16
14.00
2.33
0.93
0.10
15.00
2.42
1.00
0.08
16.00
2.50
1.06
0.06
17.00
2.56
1.10
0.05
18.00
2.62
1.14
0.05
19.00
2.66
1.18
0.04
20.00
2.70
1.21
0.03
21.00
2.74
1.24
0.03
22.00
2.77
1.27
0.03
23.00
2.81
1.29
0.03
24.00
2.84
1.32
0.03
25.00
2.84
1.32
0.00
26.00
2.84
1.32
0.00
27.00
2.84
1.32
0.00
28.00
2.84
1.32
0.00
29.00
2.84
1.32
0.00
30.00
2.84
1.32
0.00
31.00
2.84
1.32
0.00
32.00
2.84
1.32
0.00
33.00
2.84
1.32
0.00
34.00
2.84
1.32
0.00
35.00
2.84
1.32
0.00
36.00
2.84
1.32
0.00
37.00
2.84
1.32
0.00
38.00
2.84
1.32
0.00
39.00
2.84
1.32
0.00
40.00
2.84
1.32
0.00
41.00
2.84
1.32
0.00
42.00
2.84
1.32
0.00
43.00
2.84
1.32
0.00
44.00
2.84
1.32
0.00
45.00
2.84
1.32
0.00
46.00
2.84
1.32
0.00
47.00
2.84
1.32
0.00
48.00
2.84
1.32
0.00
49.00
2.84
1.32
0.00
50.00
2.84
1.32
0.00
51.00
2.84
1.32
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
2.84
1.32
0.00
53.00
2.84
1.32
0.00
54.00
2.84
1.32
0.00
55.00
2.84
1.32
0.00
56.00
2.84
1.32
0.00
57.00
2.84
1.32
0.00
58.00
2.84
1.32
0.00
59.00
2.84
1.32
0.00
60.00
2.84
1.32
0.00
61.00
2.84
1.32
0.00
62.00
2.84
1.32
0.00
63.00
2.84
1.32
0.00
64.00
2.84
1.32
0.00
65.00
2.84
1.32
0.00
66.00
2.84
1.32
0.00
67.00
2.84
1.32
0.00
68.00
2.84
1.32
0.00
69.00
2.84
1.32
0.00
70.00
2.84
1.32
0.00
71.00
2.84
1.32
0.00
72.00
2.84
1.32
0.00

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment 6S: Post -development Off -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 1.27 cfs @ 11.97 hrs, Volume= 0.064 af, Depth= 0.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-yr CPv Rainfall=2.84"
Area (ac) CN Description
1.320 69 50-75% Grass cover, Fair, HSG B
1.320 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, User
Subcatchment 6S: Post -development Off -site
Hyd rog raph
�I �I �I � � � �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I ❑Runoff
1.27 cfs
Type Il 24-hrr
1 r r CPv �Rainfaill;=2.84 "
1 Ruhbff A'rda^1.320 Ad
Pw n o!ff', Vro') L; m0=0;064 Of
w1111
Runoff Depth 0.,59"
TtT5.0tnin',
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 11
Hydrograph for Subcatchment 6S: Post -development Off -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.03
0.00
0.00
2.00
0.06
0.00
0.00
3.00
0.10
0.00
0.00
4.00
0.14
0.00
0.00
5.00
0.18
0.00
0.00
6.00
0.23
0.00
0.00
7.00
0.28
0.00
0.00
8.00
0.34
0.00
0.00
9.00
0.42
0.00
0.00
10.00
0.51
0.00
0.00
11.00
0.67
0.00
0.00
12.00
1.88
0.18
1.21
13.00
2.19
0.29
0.10
14.00
2.33
0.35
0.06
15.00
2.42
0.39
0.05
16.00
2.50
0.42
0.04
17.00
2.56
0.45
0.04
18.00
2.62
0.47
0.03
19.00
2.66
0.50
0.03
20.00
2.70
0.52
0.02
21.00
2.74
0.54
0.02
22.00
2.77
0.55
0.02
23.00
2.81
0.57
0.02
24.00
2.84
0.59
0.02
25.00
2.84
0.59
0.00
26.00
2.84
0.59
0.00
27.00
2.84
0.59
0.00
28.00
2.84
0.59
0.00
29.00
2.84
0.59
0.00
30.00
2.84
0.59
0.00
31.00
2.84
0.59
0.00
32.00
2.84
0.59
0.00
33.00
2.84
0.59
0.00
34.00
2.84
0.59
0.00
35.00
2.84
0.59
0.00
36.00
2.84
0.59
0.00
37.00
2.84
0.59
0.00
38.00
2.84
0.59
0.00
39.00
2.84
0.59
0.00
40.00
2.84
0.59
0.00
41.00
2.84
0.59
0.00
42.00
2.84
0.59
0.00
43.00
2.84
0.59
0.00
44.00
2.84
0.59
0.00
45.00
2.84
0.59
0.00
46.00
2.84
0.59
0.00
47.00
2.84
0.59
0.00
48.00
2.84
0.59
0.00
49.00
2.84
0.59
0.00
50.00
2.84
0.59
0.00
51.00
2.84
0.59
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
2.84
0.59
0.00
53.00
2.84
0.59
0.00
54.00
2.84
0.59
0.00
55.00
2.84
0.59
0.00
56.00
2.84
0.59
0.00
57.00
2.84
0.59
0.00
58.00
2.84
0.59
0.00
59.00
2.84
0.59
0.00
60.00
2.84
0.59
0.00
61.00
2.84
0.59
0.00
62.00
2.84
0.59
0.00
63.00
2.84
0.59
0.00
64.00
2.84
0.59
0.00
65.00
2.84
0.59
0.00
66.00
2.84
0.59
0.00
67.00
2.84
0.59
0.00
68.00
2.84
0.59
0.00
69.00
2.84
0.59
0.00
70.00
2.84
0.59
0.00
71.00
2.84
0.59
0.00
72.00
2.84
0.59
0.00

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 12
Summary for Pond 3P: Sand Filter
[81] Warning: Exceeded Pond 5P by 1.48' @ 12.70 hrs
Inflow Area = 3.320 ac, 23.19% Impervious, Inflow Depth = 0.68" for 1-yr CPv event
Inflow = 2.29 cfs @ 11.98 hrs, Volume= 0.189 of
Outflow = 0.42 cfs @ 12.55 hrs, Volume= 0.188 af, Atten= 82%, Lag= 34.5 min
Primary = 0.42 cfs @ 12.55 hrs, Volume= 0.188 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 894.22' @ 12.55 hrs Surf.Area= 1,769 sf Storage= 2,641 cf
Plug -Flow detention time= 388.7 min calculated for 0.188 of (100% of inflow)
Center -of -Mass det. time= 389.5 min ( 1,274.0 - 884.5 )
Volume Invert
#1 892.00'
Description
4,118 cf Custom Stage Data (Prismatic)-isted below
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
892.00
396
0 0
892.30
777
176 176
893.00
1,110
660 836
894.00
1,678
1,394 2,230
895.00
2,098
1,888 4,118
Device Routing
Invert
Outlet Devices
#1 Primary
888.06'
15.0" Round Culvert
L= 87.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 888.06' / 880.56' S= 0.0858'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 1.23 sf
#2 Device 1
892.00'
Special & User -Defined
Elev. (feet) 892.00 893.00 894.00 895.00
Disch. (cfs) 0.000 0.022 0.028 0.034
#3 Device 1
893.84'
11.4" W x 1.9" H Vert. Orifice/Grate C= 0.600
#4 Device 1
894.44'
35.6" x 35.4" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Primary
894.75'
28.0' long Sharp -Crested Rectangular Weir End Contraction(s)
Primary OutFlow Max=0.42 cfs @ 12.55 hrs HW=894.22' (Free Discharge)
1=Culvert (Passes 0.42 cfs of 17.37 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.03 cfs)
3=Orifice/Grate (Orifice Controls 0.39 cfs @ 2.62 fps)
4=Orifice/Grate ( Controls 0.00 cfs)
=Sharp -Crested Rectangular Weir( Controls 0.00 cfs)

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 13
Pond 3P: Sand Filter
Hyd rog raph
❑ Inflow
2.29 cfs ❑ Primary
r- Ilrlf!IQw I re 1 3.1320 lalcl
2 Peakl �1eV:�:094.9Z
Stbr gge='2�.6411I�1 efll
y I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
U I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
I--I--I-------I--I-------I--I--I--I--- —
p I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
LL
1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0.42 cfs
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 14
Hydrograph for Pond 3P: Sand Filter
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
892.00
0.00
2.50
0.00
0
892.00
0.00
5.00
0.00
0
892.00
0.00
7.50
0.00
0
892.00
0.00
10.00
0.01
18
892.03
0.00
12.50
0.46
2,638
894.22
0.42
15.00
0.15
2,180
893.96
0.16
17.50
0.10
2,127
893.93
0.11
20.00
0.07
2,094
893.90
0.08
22.50
0.07
2,082
893.89
0.07
25.00
0.00
1,968
893.81
0.03
27.50
0.00
1,731
893.64
0.03
30.00
0.00
1,502
893.48
0.02
32.50
0.00
1,283
893.32
0.02
35.00
0.00
1,072
893.17
0.02
37.50
0.00
869
893.02
0.02
40.00
0.00
684
892.84
0.02
42.50
0.00
534
892.68
0.01
45.00
0.00
413
892.55
0.01
47.50
0.00
315
892.45
0.01
50.00
0.00
235
892.36
0.01
52.50
0.00
170
892.29
0.01
55.00
0.00
121
892.21
0.00
57.50
0.00
87
892.15
0.00
60.00
0.00
62
892.11
0.00
62.50
0.00
44
892.08
0.00
65.00
0.00
31
892.05
0.00
67.50
0.00
22
892.04
0.00
70.00
0.00
16
892.03
0.00

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 15
Elevation Primary
(feet)
(cfs)
892.00
0.00
892.02
0.00
892.04
0.00
892.06
0.00
892.08
0.00
892.10
0.00
892.12
0.00
892.14
0.00
892.16
0.00
892.18
0.00
892.20
0.00
892.22
0.00
892.24
0.01
892.26
0.01
892.28
0.01
892.30
0.01
892.32
0.01
892.34
0.01
892.36
0.01
892.38
0.01
892.40
0.01
892.42
0.01
892.44
0.01
892.46
0.01
892.48
0.01
892.50
0.01
892.52
0.01
892.54
0.01
892.56
0.01
892.58
0.01
892.60
0.01
892.62
0.01
892.64
0.01
892.66
0.01
892.68
0.01
892.70
0.02
892.72
0.02
892.74
0.02
892.76
0.02
892.78
0.02
892.80
0.02
892.82
0.02
892.84
0.02
892.86
0.02
892.88
0.02
892.90
0.02
892.92
0.02
892.94
0.02
892.96
0.02
892.98
0.02
893.00
0.02
893.02
0.02
Stage -Discharge for Pond 3P: Sand Filter
Elevation Primary
(feet)
(cfs)
893.04
0.02
893.06
0.02
893.08
0.02
893.10
0.02
893.12
0.02
893.14
0.02
893.16
0.02
893.18
0.02
893.20
0.02
893.22
0.02
893.24
0.02
893.26
0.02
893.28
0.02
893.30
0.02
893.32
0.02
893.34
0.02
893.36
0.02
893.38
0.02
893.40
0.02
893.42
0.02
893.44
0.02
893.46
0.02
893.48
0.02
893.50
0.03
893.52
0.03
893.54
0.03
893.56
0.03
893.58
0.03
893.60
0.03
893.62
0.03
893.64
0.03
893.66
0.03
893.68
0.03
893.70
0.03
893.72
0.03
893.74
0.03
893.76
0.03
893.78
0.03
893.80
0.03
893.82
0.03
893.84
0.03
893.86
0.04
893.88
0.05
893.90
0.07
893.92
0.10
893.94
0.12
893.96
0.15
893.98
0.19
894.00
0.22
894.02
0.25
894.04
0.28
894.06
0.30
Elevation Primary
(feet)
(cfs)
894.08
0.32
894.10
0.33
894.12
0.35
894.14
0.37
894.16
0.38
894.18
0.40
894.20
0.41
894.22
0.43
894.24
0.44
894.26
0.45
894.28
0.46
894.30
0.48
894.32
0.49
894.34
0.50
894.36
0.51
894.38
0.52
894.40
0.53
894.42
0.54
894.44
0.55
894.46
0.67
894.48
0.88
894.50
1.15
894.52
1.47
894.54
1.83
894.56
2.22
894.58
2.65
894.60
3.11
894.62
3.59
894.64
4.11
894.66
4.65
894.68
5.21
894.70
5.80
894.72
6.41
894.74
7.05
894.76
7.79
894.78
8.85
894.80
10.09
894.82
11.48
894.84
12.99
894.86
14.61
894.88
16.32
894.90
18.14
894.92
20.04
894.94
22.02
894.96
24.08
894.98
26.22
895.00
28.43

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 16
Stage -Area -Storage for Pond 3P: Sand Filter
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
892.00
396
0
892.05
459
29
892.10
523
59
892.15
586
88
892.20
650
117
892.25
713
147
892.30
777
176
892.35
801
223
892.40
825
270
892.45
848
317
892.50
872
365
892.55
896
412
892.60
920
459
892.65
943
506
892.70
967
553
892.75
991
601
892.80
1,015
648
892.85
1,039
695
892.90
1,062
742
892.95
1,086
789
893.00
1,110
836
893.05
1,138
906
893.10
1,167
976
893.15
1,195
1,045
893.20
1,224
1,115
893.25
1,252
1,185
893.30
1,280
1,255
893.35
1,309
1,324
893.40
1,337
1,394
893.45
1,366
1,464
893.50
1,394
1,533
893.55
1,422
1,603
893.60
1,451
1,673
893.65
1,479
1,742
893.70
1,508
1,812
893.75
1,536
1,882
893.80
1,564
1,952
893.85
1,593
2,021
893.90
1,621
2,091
893.95
1,650
2,161
894.00
1,678
2,230
894.05
1,699
2,325
894.10
1,720
2,419
894.15
1,741
2,514
894.20
1,762
2,608
894.25
1,783
2,702
894.30
1,804
2,797
894.35
1,825
2,891
894.40
1,846
2,986
894.45
1,867
3,080
894.50
1,888
3,174
894.55
1,909
3,269
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
894.60
1,930
3,363
894.65
1,951
3,458
894.70
1,972
3,552
894.75
1,993
3,646
894.80
2,014
3,741
894.85
2,035
3,835
894.90
2,056
3,930
894.95
2,077
4,024
895.00
2,098
4,118

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 17
Summary for Pond 5P: Flow Splitter
[57] Hint: Peaked at 893.34' (Flood elevation advised)
Inflow Area = 2.510 ac, 27.89% Impervious, Inflow Depth = 0.93" for 1-yr CPv event
Inflow =
4.09 cfs @
11.96 hrs,
Volume=
0.195 of
Outflow =
4.09 cfs @
11.96 hrs,
Volume=
0.195 af, Atten= 0%, Lag= 0.0 min
Primary =
2.06 cfs @
11.96 hrs,
Volume=
0.162 of
Secondary =
2.02 cfs @
11.96 hrs,
Volume=
0.034 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 893.34' @ 11.96 hrs
Device Routina Invert Outlet Devices
#1 Primary 892.43' 12.0" Round Culvert
L= 26.7' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.43' / 892.23' S= 0.0075'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf
#2 Secondary 892.35' 24.0" Round Culvert
L= 129.4' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.35' / 880.00' S= 0.0954'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 3.14 sf
#3 Device 2 892.75' 1.5' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=2.00 cfs @ 11.96 hrs HW=893.32' (Free Discharge)
L1=Culvert (Barrel Controls 2.00 cfs @ 3.61 fps)
Secondary OutFlow Max=1.94 cfs @ 11.96 hrs HW=893.32' (Free Discharge)
L2=Culvert (Passes 1.94 cfs of 5.04 cfs potential flow)
L3=Sharp -Crested Rectangular Weir(Weir Controls 1.94 cfs @ 2.46 fps)

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 18
Pond 5P: Flow Splitter
Hyd rog raph
4.09 cfs _, _ 4 — r — I — — r — I — — r — I — — r — I-
4.09 cfs II rifIOW Aroa-2.5%a'Ic'I
Peak EIOV=03.34'I
4
3
r-r-r--r-r--r-r-r--r-r-- r-r-- r-
r--r-r--r-r-rr-r--r-r-r
N I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
U 2.06 cfs
3 2.02 cfs
0 LL
2
1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0 2 4 6 8 10 1214 1618 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)
❑ InflowOutflow
El Primary
Secondary

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 19
Hydrograph for Pond 5P: Flow Splitter
Time
Inflow
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
892.35
0.00
0.00
0.00
2.50
0.00
892.35
0.00
0.00
0.00
5.00
0.00
892.35
0.00
0.00
0.00
7.50
0.00
892.35
0.00
0.00
0.00
10.00
0.01
892.49
0.01
0.01
0.00
12.50
0.39
892.76
0.39
0.38
0.01
15.00
0.13
892.62
0.13
0.13
0.00
17.50
0.09
892.58
0.09
0.09
0.00
20.00
0.06
892.56
0.06
0.06
0.00
22.50
0.05
892.55
0.05
0.05
0.00
25.00
0.00
892.43
0.00
0.00
0.00
27.50
0.00
892.43
0.00
0.00
0.00
30.00
0.00
892.43
0.00
0.00
0.00
32.50
0.00
892.43
0.00
0.00
0.00
35.00
0.00
892.43
0.00
0.00
0.00
37.50
0.00
892.43
0.00
0.00
0.00
40.00
0.00
892.43
0.00
0.00
0.00
42.50
0.00
892.43
0.00
0.00
0.00
45.00
0.00
892.43
0.00
0.00
0.00
47.50
0.00
892.43
0.00
0.00
0.00
50.00
0.00
892.43
0.00
0.00
0.00
52.50
0.00
892.43
0.00
0.00
0.00
55.00
0.00
892.43
0.00
0.00
0.00
57.50
0.00
892.43
0.00
0.00
0.00
60.00
0.00
892.43
0.00
0.00
0.00
62.50
0.00
892.43
0.00
0.00
0.00
65.00
0.00
892.43
0.00
0.00
0.00
67.50
0.00
892.43
0.00
0.00
0.00
70.00
0.00
892.43
0.00
0.00
0.00

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 20
Stage -Discharge for Pond 5P: Flow Splitter
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
892.35
0.00
0.00
0.00
892.37
0.00
0.00
0.00
892.39
0.00
0.00
0.00
892.41
0.00
0.00
0.00
892.43
0.00
0.00
0.00
892.45
0.00
0.00
0.00
892.47
0.01
0.01
0.00
892.49
0.01
0.01
0.00
892.51
0.02
0.02
0.00
892.53
0.04
0.04
0.00
892.55
0.05
0.05
0.00
892.57
0.07
0.07
0.00
892.59
0.09
0.09
0.00
892.61
0.12
0.12
0.00
892.63
0.15
0.15
0.00
892.65
0.17
0.17
0.00
892.67
0.21
0.21
0.00
892.69
0.24
0.24
0.00
892.71
0.28
0.28
0.00
892.73
0.31
0.31
0.00
892.75
0.35
0.35
0.00
892.77
0.41
0.40
0.01
892.79
0.48
0.44
0.04
892.81
0.56
0.48
0.07
892.83
0.64
0.53
0.11
892.85
0.73
0.58
0.15
892.87
0.83
0.63
0.20
892.89
0.93
0.68
0.25
892.91
1.04
0.73
0.31
892.93
1.15
0.79
0.37
892.95
1.27
0.84
0.43
892.97
1.39
0.90
0.49
892.99
1.52
0.96
0.56
893.01
1.64
1.02
0.63
893.03
1.78
1.08
0.70
893.05
1.91
1.14
0.77
893.07
2.05
1.20
0.85
893.09
2.19
1.26
0.93
893.11
2.33
1.32
1.01
893.13
2.48
1.39
1.09
893.15
2.63
1.45
1.17
893.17
2.78
1.52
1.26
893.19
2.93
1.58
1.35
893.21
3.09
1.65
1.44
893.23
3.24
1.71
1.53
893.25
3.40
1.78
1.62
893.27
3.56
1.85
1.71
893.29
3.72
1.91
1.81
893.31
3.88
1.98
1.90
893.33
4.05
2.05
2.00
893.35
4.21
2.11
2.10
893.37
4.37
2.18
2.20
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
893.39
4.54
2.24
2.30
893.41
4.71
2.31
2.40
893.43
4.87
2.37
2.50
893.45
5.04
2.44
2.60
893.47
5.21
2.50
2.71
893.49
5.37
2.56
2.81
893.51
5.54
2.62
2.92
893.53
5.70
2.68
3.03
893.55
5.87
2.73
3.14
893.57
6.03
2.79
3.24
893.59
6.20
2.84
3.35
893.61
6.36
2.89
3.46
893.63
6.51
2.94
3.57
893.65
6.67
2.98
3.69
893.67
6.82
3.02
3.80
893.69
6.97
3.06
3.91
893.71
7.11
3.09
4.02
893.73
7.25
3.11
4.14
893.75
7.37
3.12
4.25
893.77
7.48
3.11
4.37
893.79
7.65
3.17
4.48
893.81
7.82
3.23
4.60
893.83
7.99
3.28
4.71
893.85
8.16
3.34
4.83
893.87
8.33
3.39
4.95
893.89
8.50
3.44
5.06
893.91
8.67
3.49
5.18
893.93
8.84
3.54
5.30
893.95
9.01
3.59
5.42
893.97
9.18
3.64
5.53
893.99
9.35
3.69
5.65
894.01
9.51
3.74
5.77
894.03
9.68
3.79
5.89
894.05
9.85
3.84
6.01
894.07
10.01
3.88
6.13
894.09
10.18
3.93
6.25
894.11
10.34
3.97
6.37
894.13
10.51
4.02
6.49
894.15
10.67
4.06
6.61
894.17
10.83
4.11
6.73
894.19
11.00
4.15
6.85
894.21
11.16
4.19
6.97
894.23
11.32
4.24
7.09
894.25
11.49
4.28
7.21
894.27
11.65
4.32
7.33
894.29
11.81
4.36
7.45
894.31
11.97
4.40
7.57
894.33
12.13
4.44
7.69
894.35
12.29
4.48
7.81

6028_Sand Filter Type 11 24-hr 1-yr CPv Rainfall=2.84"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 21
Elevation
Storage
(feet)
(cubic -feet)
892.35
0
892.37
0
892.39
0
892.41
0
892.43
0
892.45
0
892.47
0
892.49
0
892.51
0
892.53
0
892.55
0
892.57
0
892.59
0
892.61
0
892.63
0
892.65
0
892.67
0
892.69
0
892.71
0
892.73
0
892.75
0
892.77
0
892.79
0
892.81
0
892.83
0
892.85
0
892.87
0
892.89
0
892.91
0
892.93
0
892.95
0
892.97
0
892.99
0
893.01
0
893.03
0
893.05
0
893.07
0
893.09
0
893.11
0
893.13
0
893.15
0
893.17
0
893.19
0
893.21
0
893.23
0
893.25
0
893.27
0
893.29
0
893.31
0
893.33
0
893.35
0
893.37
0
Stage -Area -Storage for Pond 5P: Flow Splitter
Elevation
Storage
(feet)
(cubic -feet)
893.39
0
893.41
0
893.43
0
893.45
0
893.47
0
893.49
0
893.51
0
893.53
0
893.55
0
893.57
0
893.59
0
893.61
0
893.63
0
893.65
0
893.67
0
893.69
0
893.71
0
893.73
0
893.75
0
893.77
0
893.79
0
893.81
0
893.83
0
893.85
0
893.87
0
893.89
0
893.91
0
893.93
0
893.95
0
893.97
0
893.99
0
894.01
0
894.03
0
894.05
0
894.07
0
894.09
0
894.11
0
894.13
0
894.15
0
894.17
0
894.19
0
894.21
0
894.23
0
894.25
0
894.27
0
894.29
0
894.31
0
894.33
0
894.35
0

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 22
Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment1S: Pre-developmentArea Runoff Area=2.000 ac 7.00% Impervious Runoff Depth=2.14"
Flow Length=422' Tc=13.4 min CN=87 Runoff=5.75 cfs 0.356 of
Subcatchment2S: Post-developmentto Runoff Area=0.810 ac 8.64% Impervious Runoff Depth=0.68"
Tc=10.0 min CN=64 Runoff=0.73 cfs 0.046 of
Subcatchment4S: Post -development Runoff Area=1.190 ac 58.82% Impervious Runoff Depth=1.82"
Tc=5.0 min CN=83 Runoff=3.88 cfs 0.180 of
Subcatchment6S: Post -development Runoff Area=1.320 ac 0.00% Impervious Runoff Depth=0.92"
Tc=5.0 min CN=69 Runoff=2.12 cfs 0.102 of
Pond 3P: Sand Filter Peak Elev=894.53' Storage=3,230 cf Inflow=3.32 cfs 0.268 of
Outflow=1.58 cfs 0.268 of
Pond 5P: Flow Splitter Peak Elev=893.56' Inflow=5.99 cfs 0.282 of
Primary=2.78 cfs 0.222 of Secondary=3.21 cfs 0.060 of Outflow=5.99 cfs 0.282 of
Total Runoff Area = 5.320 ac Runoff Volume = 0.684 of Average Runoff Depth = 1.54"
82.89% Pervious = 4.410 ac 17.11% Impervious = 0.910 ac

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 23
Summary for Subcatchment 1S: Pre -development Area
50% woods & 50% pasture
Runoff = 5.75 cfs @ 12.05 hrs, Volume= 0.356 af, Depth= 2.14"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 2-yr 24-hr Rainfall=3.45"
Area (ac)
CN
Description
0.140
98
Paved parking, HSG B
1.860
86
Fallow, bare soil, HSG B
2.000
87
Weighted Average
1.860
93.00% Pervious Area
0.140
7.00% Impervious Area
Tc
Length
Slope
Velocity Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec) (cfs)
12.2
100
0.0270
0.14
Sheet Flow,
n= 0.240 P2= 3.45"
1.2
322
0.0712
4.30
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
13.4 422 Total
Subcatchment 1S: Pre -development Area
Hydrograph
- �- -�- -�- -� - -� - �I - �� - I�� - �� - �� - I�- -�- -�- -�- -� - I�� - I�� - �� - �� - �� - I�� -'�- -�- -�- -I� - -�� - I�� - I�� - SIT - �� - �� - �- -�- -�- -� - ■Runoff
6 5.75 cfs
2.— r�� 24Thr �Rainfa�fl 3.45"
5 1
Ruhbff A'rela^2.000 Aln
4 PL11Jofif,Vr&1L;rM1Q='10;3$0 ;3f
w I I I I I I I I I I I I I I I I I I I I I � '� I ��
R6no f lbel 1 1=21 .1-
3 F16w Lehcoth.-42',2'�,
2 Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili Ili � � I=$ /;
-------- -;-;- -- -- -- -;-T F F--- -;-
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 24
Hydrograph for Subcatchment 1S: Pre -development Area
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.08
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.17
0.00
0.00
5.00
0.22
0.00
0.00
6.00
0.28
0.00
0.00
7.00
0.34
0.00
0.01
8.00
0.41
0.01
0.02
9.00
0.51
0.03
0.04
10.00
0.62
0.06
0.08
11.00
0.81
0.13
0.19
12.00
2.29
1.14
5.18
13.00
2.66
1.45
0.42
14.00
2.83
1.59
0.25
15.00
2.94
1.69
0.19
16.00
3.04
1.77
0.15
17.00
3.11
1.84
0.13
18.00
3.18
1.89
0.11
19.00
3.24
1.95
0.10
20.00
3.28
1.99
0.08
21.00
3.33
2.03
0.08
22.00
3.37
2.07
0.08
23.00
3.41
2.10
0.07
24.00
3.45
2.14
0.07
25.00
3.45
2.14
0.00
26.00
3.45
2.14
0.00
27.00
3.45
2.14
0.00
28.00
3.45
2.14
0.00
29.00
3.45
2.14
0.00
30.00
3.45
2.14
0.00
31.00
3.45
2.14
0.00
32.00
3.45
2.14
0.00
33.00
3.45
2.14
0.00
34.00
3.45
2.14
0.00
35.00
3.45
2.14
0.00
36.00
3.45
2.14
0.00
37.00
3.45
2.14
0.00
38.00
3.45
2.14
0.00
39.00
3.45
2.14
0.00
40.00
3.45
2.14
0.00
41.00
3.45
2.14
0.00
42.00
3.45
2.14
0.00
43.00
3.45
2.14
0.00
44.00
3.45
2.14
0.00
45.00
3.45
2.14
0.00
46.00
3.45
2.14
0.00
47.00
3.45
2.14
0.00
48.00
3.45
2.14
0.00
49.00
3.45
2.14
0.00
50.00
3.45
2.14
0.00
51.00
3.45
2.14
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
3.45
2.14
0.00
53.00
3.45
2.14
0.00
54.00
3.45
2.14
0.00
55.00
3.45
2.14
0.00
56.00
3.45
2.14
0.00
57.00
3.45
2.14
0.00
58.00
3.45
2.14
0.00
59.00
3.45
2.14
0.00
60.00
3.45
2.14
0.00
61.00
3.45
2.14
0.00
62.00
3.45
2.14
0.00
63.00
3.45
2.14
0.00
64.00
3.45
2.14
0.00
65.00
3.45
2.14
0.00
66.00
3.45
2.14
0.00
67.00
3.45
2.14
0.00
68.00
3.45
2.14
0.00
69.00
3.45
2.14
0.00
70.00
3.45
2.14
0.00
71.00
3.45
2.14
0.00
72.00
3.45
2.14
0.00

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 25
Summary for Subcatchment 2S: Post -development to Basin
Runoff = 0.73 cfs @ 12.04 hrs, Volume= 0.046 af, Depth= 0.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 2-yr 24-hr Rainfall=3.45"
Area (ac) CN Description
0.070 98 Paved parking, HSG B
0.740 61 >75% Grass cover, Good, HSG B
0.810 64 Weighted Average
0.740 91.36% Pervious Area
0.070 8.64% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, User
Subcatchment 2S: Post -development to Basin
Hydrograph
0.8
— r — r — r —
0.73 cfs
0.75-II--I--I----1-L-L-1--1-J-J-1-1-L-L-I--I--I-J-�-L-I-L-L- I--I-p�- I-
0.7 , y pe - - - r
0.65 211r_,24-mhr_ Rai rlifa►11�-- 1457-
-----I--I- -+-+-+----+-+-+-+-+-+-I-
I I I I I I I
0.6 I I I_ I_ I_ i i I_ I_ I_ I_ I_I_I_i i I_ I_ I_
0.55
1 �rbff-Area=Q.81 Q Ac-
0.5-----I--I--r-r-r----r-r-Y-Y-r-r-r-I�npf iV O�tAMpi
_ -------1-L-L-1--1-J-J-1-1-L-L-I--I- -
w 0.45 *I h-
kJ111-I©Ie t�afi8"
3 04
a 0.35
0.3-------Ii-- T-r- r----T- T- T- T-r-r -Ii----T- T- T-T-r-r-------I
0.25
02
-I--I-
0.15
-r-r-I--I- r-r-r-I--I-r-r-Y-Y-r-r-r-I--I-r-r-Y-r-r-r-r-I--I-r-r-r-r-r-r
'I
0.1-----I--I--L-L-1--1-J-J-1-1-L-L-----I-J- -L-i--L---I--I--s-L-L-L-I-
0.05
0
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)
■ Runoff

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 26
Hydrograph for Subcatchment 2S: Post -development to Basin
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.08
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.17
0.00
0.00
5.00
0.22
0.00
0.00
6.00
0.28
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.51
0.00
0.00
10.00
0.62
0.00
0.00
11.00
0.81
0.00
0.00
12.00
2.29
0.20
0.67
13.00
2.66
0.33
0.07
14.00
2.83
0.40
0.05
15.00
2.94
0.44
0.04
16.00
3.04
0.48
0.03
17.00
3.11
0.52
0.03
18.00
3.18
0.55
0.02
19.00
3.24
0.58
0.02
20.00
3.28
0.60
0.02
21.00
3.33
0.62
0.02
22.00
3.37
0.64
0.02
23.00
3.41
0.66
0.02
24.00
3.45
0.68
0.02
25.00
3.45
0.68
0.00
26.00
3.45
0.68
0.00
27.00
3.45
0.68
0.00
28.00
3.45
0.68
0.00
29.00
3.45
0.68
0.00
30.00
3.45
0.68
0.00
31.00
3.45
0.68
0.00
32.00
3.45
0.68
0.00
33.00
3.45
0.68
0.00
34.00
3.45
0.68
0.00
35.00
3.45
0.68
0.00
36.00
3.45
0.68
0.00
37.00
3.45
0.68
0.00
38.00
3.45
0.68
0.00
39.00
3.45
0.68
0.00
40.00
3.45
0.68
0.00
41.00
3.45
0.68
0.00
42.00
3.45
0.68
0.00
43.00
3.45
0.68
0.00
44.00
3.45
0.68
0.00
45.00
3.45
0.68
0.00
46.00
3.45
0.68
0.00
47.00
3.45
0.68
0.00
48.00
3.45
0.68
0.00
49.00
3.45
0.68
0.00
50.00
3.45
0.68
0.00
51.00
3.45
0.68
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
3.45
0.68
0.00
53.00
3.45
0.68
0.00
54.00
3.45
0.68
0.00
55.00
3.45
0.68
0.00
56.00
3.45
0.68
0.00
57.00
3.45
0.68
0.00
58.00
3.45
0.68
0.00
59.00
3.45
0.68
0.00
60.00
3.45
0.68
0.00
61.00
3.45
0.68
0.00
62.00
3.45
0.68
0.00
63.00
3.45
0.68
0.00
64.00
3.45
0.68
0.00
65.00
3.45
0.68
0.00
66.00
3.45
0.68
0.00
67.00
3.45
0.68
0.00
68.00
3.45
0.68
0.00
69.00
3.45
0.68
0.00
70.00
3.45
0.68
0.00
71.00
3.45
0.68
0.00
72.00
3.45
0.68
0.00

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 27
Summary for Subcatchment 4S: Post -development On -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 3.88 cfs @ 11.96 hrs, Volume= 0.180 af, Depth= 1.82"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 2-yr 24-hr Rainfall=3.45"
Area (ac) CN Description
0.700 98 Paved parking, HSG B
0.490 61 >75% Grass cover, Good, HSG B
1.190 83 Weighted Average
0.490 41.18% Pervious Area
0.700 58.82% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, User
Subcatchment 4S: Post -development On -site
Hydrograph
I I I ■Runoff
— Y —I— —I— Y — Y — Y — Y — Y — t — Y — Y —I— —I— —I— Y — Y — Y — Y — t — Y — Y —I— —I— —I— Y — Y — Y — Y — t — Y — Y — I— —I— —I— Y —
4 1 3.88 cfs 1
Type I'll 24-hrr
2-Yr�1214rhr 1Rainlfaill;=3.45"
- I--1- T -T -T T -T -T- ;Ruh6ffwr6&1_190 Ad-
3-
F't; jjog1 Volt# rM00;1 Of
w1111
Ru�lnoff bept&:1.82"
V IIII IIIIIIIIIIIIIII
—r—I--1—T——T—T—T—T—T------T—,— T—T—T— r— T------T— T— T—T— T —r —T —I—I--1—T-
0 2 TtT5.0 Min'
LL I I I I I I I I I I I I I I I I I I I I I I I I I I I I
1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 28
Hydrograph for Subcatchment 4S: Post -development On -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.08
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.17
0.00
0.00
5.00
0.22
0.00
0.00
6.00
0.28
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.51
0.00
0.01
10.00
0.62
0.02
0.03
11.00
0.81
0.07
0.08
12.00
2.29
0.90
3.39
13.00
2.66
1.18
0.21
14.00
2.83
1.31
0.13
15.00
2.94
1.40
0.10
16.00
3.04
1.48
0.08
17.00
3.11
1.54
0.07
18.00
3.18
1.59
0.06
19.00
3.24
1.64
0.05
20.00
3.28
1.68
0.05
21.00
3.33
1.72
0.04
22.00
3.37
1.75
0.04
23.00
3.41
1.78
0.04
24.00
3.45
1.82
0.04
25.00
3.45
1.82
0.00
26.00
3.45
1.82
0.00
27.00
3.45
1.82
0.00
28.00
3.45
1.82
0.00
29.00
3.45
1.82
0.00
30.00
3.45
1.82
0.00
31.00
3.45
1.82
0.00
32.00
3.45
1.82
0.00
33.00
3.45
1.82
0.00
34.00
3.45
1.82
0.00
35.00
3.45
1.82
0.00
36.00
3.45
1.82
0.00
37.00
3.45
1.82
0.00
38.00
3.45
1.82
0.00
39.00
3.45
1.82
0.00
40.00
3.45
1.82
0.00
41.00
3.45
1.82
0.00
42.00
3.45
1.82
0.00
43.00
3.45
1.82
0.00
44.00
3.45
1.82
0.00
45.00
3.45
1.82
0.00
46.00
3.45
1.82
0.00
47.00
3.45
1.82
0.00
48.00
3.45
1.82
0.00
49.00
3.45
1.82
0.00
50.00
3.45
1.82
0.00
51.00
3.45
1.82
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
3.45
1.82
0.00
53.00
3.45
1.82
0.00
54.00
3.45
1.82
0.00
55.00
3.45
1.82
0.00
56.00
3.45
1.82
0.00
57.00
3.45
1.82
0.00
58.00
3.45
1.82
0.00
59.00
3.45
1.82
0.00
60.00
3.45
1.82
0.00
61.00
3.45
1.82
0.00
62.00
3.45
1.82
0.00
63.00
3.45
1.82
0.00
64.00
3.45
1.82
0.00
65.00
3.45
1.82
0.00
66.00
3.45
1.82
0.00
67.00
3.45
1.82
0.00
68.00
3.45
1.82
0.00
69.00
3.45
1.82
0.00
70.00
3.45
1.82
0.00
71.00
3.45
1.82
0.00
72.00
3.45
1.82
0.00

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 29
Summary for Subcatchment 6S: Post -development Off -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 2.12 cfs @ 11.97 hrs, Volume= 0.102 af, Depth= 0.92"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 2-yr 24-hr Rainfall=3.45"
Area (ac) CN Description
1.320 69 50-75% Grass cover, Fair, HSG B
1.320 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, User
Subcatchment 6S: Post -development Off -site
Hydrograph
�I �I �I � � � �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I �I ■Runoff
2.12 cfs iqu-Qi �i
—r—i--i—y--—t—t—t—r_r_i--i--i—y_y_t_t_t_r_r_i__i__i_y_y_t��,r �f �i� ���•I_
2
2-Yr�� 2�4Thr �Rainfaill;=3.45"
Ruhbff A'rda^1.320 Ad
F't;11 o!ff', Volt; rM00;10 Of
w111111
Runoff Depth 0.92"
o -'---'-J- -1-1- -'L-'-----'-J- -1-1- -
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 30
Hydrograph for Subcatchment 6S: Post -development Off -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.04
0.00
0.00
2.00
0.08
0.00
0.00
3.00
0.12
0.00
0.00
4.00
0.17
0.00
0.00
5.00
0.22
0.00
0.00
6.00
0.28
0.00
0.00
7.00
0.34
0.00
0.00
8.00
0.41
0.00
0.00
9.00
0.51
0.00
0.00
10.00
0.62
0.00
0.00
11.00
0.81
0.00
0.00
12.00
2.29
0.33
1.97
13.00
2.66
0.50
0.14
14.00
2.83
0.58
0.09
15.00
2.94
0.64
0.07
16.00
3.04
0.69
0.06
17.00
3.11
0.73
0.05
18.00
3.18
0.77
0.05
19.00
3.24
0.80
0.04
20.00
3.28
0.83
0.03
21.00
3.33
0.85
0.03
22.00
3.37
0.88
0.03
23.00
3.41
0.90
0.03
24.00
3.45
0.92
0.03
25.00
3.45
0.92
0.00
26.00
3.45
0.92
0.00
27.00
3.45
0.92
0.00
28.00
3.45
0.92
0.00
29.00
3.45
0.92
0.00
30.00
3.45
0.92
0.00
31.00
3.45
0.92
0.00
32.00
3.45
0.92
0.00
33.00
3.45
0.92
0.00
34.00
3.45
0.92
0.00
35.00
3.45
0.92
0.00
36.00
3.45
0.92
0.00
37.00
3.45
0.92
0.00
38.00
3.45
0.92
0.00
39.00
3.45
0.92
0.00
40.00
3.45
0.92
0.00
41.00
3.45
0.92
0.00
42.00
3.45
0.92
0.00
43.00
3.45
0.92
0.00
44.00
3.45
0.92
0.00
45.00
3.45
0.92
0.00
46.00
3.45
0.92
0.00
47.00
3.45
0.92
0.00
48.00
3.45
0.92
0.00
49.00
3.45
0.92
0.00
50.00
3.45
0.92
0.00
51.00
3.45
0.92
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
3.45
0.92
0.00
53.00
3.45
0.92
0.00
54.00
3.45
0.92
0.00
55.00
3.45
0.92
0.00
56.00
3.45
0.92
0.00
57.00
3.45
0.92
0.00
58.00
3.45
0.92
0.00
59.00
3.45
0.92
0.00
60.00
3.45
0.92
0.00
61.00
3.45
0.92
0.00
62.00
3.45
0.92
0.00
63.00
3.45
0.92
0.00
64.00
3.45
0.92
0.00
65.00
3.45
0.92
0.00
66.00
3.45
0.92
0.00
67.00
3.45
0.92
0.00
68.00
3.45
0.92
0.00
69.00
3.45
0.92
0.00
70.00
3.45
0.92
0.00
71.00
3.45
0.92
0.00
72.00
3.45
0.92
0.00

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 31
Summary for Pond 3P: Sand Filter
[81] Warning: Exceeded Pond 5P by 1.66' @ 12.65 hrs
Inflow Area = 3.320 ac, 23.19% Impervious, Inflow Depth = 0.97" for 2-yr 24-hr event
Inflow = 3.32 cfs @ 11.98 hrs, Volume= 0.268 of
Outflow = 1.58 cfs @ 12.12 hrs, Volume= 0.268 af, Atten= 52%, Lag= 8.4 min
Primary = 1.58 cfs @ 12.12 hrs, Volume= 0.268 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 894.53' @ 12.12 hrs Surf.Area= 1,900 sf Storage= 3,230 cf
Plug -Flow detention time= 283.4 min calculated for 0.268 of (100% of inflow)
Center -of -Mass det. time= 284.5 min ( 1,162.1 - 877.6 )
Volume Invert
#1 892.00'
Description
4,118 cf Custom Stage Data (Prismatic)-isted below
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
892.00
396
0 0
892.30
777
176 176
893.00
1,110
660 836
894.00
1,678
1,394 2,230
895.00
2,098
1,888 4,118
Device Routing
Invert
Outlet Devices
#1 Primary
888.06'
15.0" Round Culvert
L= 87.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 888.06' / 880.56' S= 0.0858'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 1.23 sf
#2 Device 1
892.00'
Special & User -Defined
Elev. (feet) 892.00 893.00 894.00 895.00
Disch. (cfs) 0.000 0.022 0.028 0.034
#3 Device 1
893.84'
11.4" W x 1.9" H Vert. Orifice/Grate C= 0.600
#4 Device 1
894.44'
35.6" x 35.4" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Primary
894.75'
28.0' long Sharp -Crested Rectangular Weir End Contraction(s)
Primary OutFlow Max=1.45 cfs @ 12.12 hrs HW=894.52' (Free Discharge)
1=Culvert (Passes 1.45 cfs of 17.84 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.03 cfs)
3=Orifice/Grate (Orifice Controls 0.56 cfs @ 3.73 fps)
4=Orifice/Grate (Weir Controls 0.86 cfs @ 0.92 fps)
=Sharp -Crested Rectangular Weir( Controls 0.00 cfs)

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 32
Pond 3P: Sand Filter
Hyd rog raph
❑ Inflow
3.32 cfs
I ❑ Primary
-Mr1TW rr1_1 3,3Z0-ac,-
3 Pe;a,k, �1eV:�:$94•53'�
�Stor ge=3�.230, ef,
y I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
U 2
p1.58 cfs
LL
I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
Time (hours)

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 33
Hydrograph for Pond 3P: Sand Filter
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
892.00
0.00
2.50
0.00
0
892.00
0.00
5.00
0.00
0
892.00
0.00
7.50
0.00
0
892.00
0.00
10.00
0.03
74
892.13
0.00
12.50
0.60
3,092
894.46
0.65
15.00
0.21
2,264
894.02
0.25
17.50
0.14
2,165
893.95
0.14
20.00
0.10
2,125
893.92
0.10
22.50
0.09
2,111
893.91
0.09
25.00
0.00
1,978
893.82
0.03
27.50
0.00
1,740
893.65
0.03
30.00
0.00
1,512
893.48
0.02
32.50
0.00
1,292
893.33
0.02
35.00
0.00
1,080
893.17
0.02
37.50
0.00
877
893.03
0.02
40.00
0.00
691
892.85
0.02
42.50
0.00
540
892.69
0.02
45.00
0.00
418
892.56
0.01
47.50
0.00
318
892.45
0.01
50.00
0.00
238
892.37
0.01
52.50
0.00
172
892.29
0.01
55.00
0.00
123
892.21
0.00
57.50
0.00
88
892.15
0.00
60.00
0.00
63
892.11
0.00
62.50
0.00
45
892.08
0.00
65.00
0.00
32
892.05
0.00
67.50
0.00
23
892.04
0.00
70.00
0.00
16
892.03
0.00

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 34
Elevation Primary
(feet)
(cfs)
892.00
0.00
892.02
0.00
892.04
0.00
892.06
0.00
892.08
0.00
892.10
0.00
892.12
0.00
892.14
0.00
892.16
0.00
892.18
0.00
892.20
0.00
892.22
0.00
892.24
0.01
892.26
0.01
892.28
0.01
892.30
0.01
892.32
0.01
892.34
0.01
892.36
0.01
892.38
0.01
892.40
0.01
892.42
0.01
892.44
0.01
892.46
0.01
892.48
0.01
892.50
0.01
892.52
0.01
892.54
0.01
892.56
0.01
892.58
0.01
892.60
0.01
892.62
0.01
892.64
0.01
892.66
0.01
892.68
0.01
892.70
0.02
892.72
0.02
892.74
0.02
892.76
0.02
892.78
0.02
892.80
0.02
892.82
0.02
892.84
0.02
892.86
0.02
892.88
0.02
892.90
0.02
892.92
0.02
892.94
0.02
892.96
0.02
892.98
0.02
893.00
0.02
893.02
0.02
Stage -Discharge for Pond 3P: Sand Filter
Elevation Primary
(feet)
(cfs)
893.04
0.02
893.06
0.02
893.08
0.02
893.10
0.02
893.12
0.02
893.14
0.02
893.16
0.02
893.18
0.02
893.20
0.02
893.22
0.02
893.24
0.02
893.26
0.02
893.28
0.02
893.30
0.02
893.32
0.02
893.34
0.02
893.36
0.02
893.38
0.02
893.40
0.02
893.42
0.02
893.44
0.02
893.46
0.02
893.48
0.02
893.50
0.03
893.52
0.03
893.54
0.03
893.56
0.03
893.58
0.03
893.60
0.03
893.62
0.03
893.64
0.03
893.66
0.03
893.68
0.03
893.70
0.03
893.72
0.03
893.74
0.03
893.76
0.03
893.78
0.03
893.80
0.03
893.82
0.03
893.84
0.03
893.86
0.04
893.88
0.05
893.90
0.07
893.92
0.10
893.94
0.12
893.96
0.15
893.98
0.19
894.00
0.22
894.02
0.25
894.04
0.28
894.06
0.30
Elevation Primary
(feet)
(cfs)
894.08
0.32
894.10
0.33
894.12
0.35
894.14
0.37
894.16
0.38
894.18
0.40
894.20
0.41
894.22
0.43
894.24
0.44
894.26
0.45
894.28
0.46
894.30
0.48
894.32
0.49
894.34
0.50
894.36
0.51
894.38
0.52
894.40
0.53
894.42
0.54
894.44
0.55
894.46
0.67
894.48
0.88
894.50
1.15
894.52
1.47
894.54
1.83
894.56
2.22
894.58
2.65
894.60
3.11
894.62
3.59
894.64
4.11
894.66
4.65
894.68
5.21
894.70
5.80
894.72
6.41
894.74
7.05
894.76
7.79
894.78
8.85
894.80
10.09
894.82
11.48
894.84
12.99
894.86
14.61
894.88
16.32
894.90
18.14
894.92
20.04
894.94
22.02
894.96
24.08
894.98
26.22
895.00
28.43

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 35
Stage -Area -Storage for Pond 3P: Sand Filter
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
892.00
396
0
892.05
459
29
892.10
523
59
892.15
586
88
892.20
650
117
892.25
713
147
892.30
777
176
892.35
801
223
892.40
825
270
892.45
848
317
892.50
872
365
892.55
896
412
892.60
920
459
892.65
943
506
892.70
967
553
892.75
991
601
892.80
1,015
648
892.85
1,039
695
892.90
1,062
742
892.95
1,086
789
893.00
1,110
836
893.05
1,138
906
893.10
1,167
976
893.15
1,195
1,045
893.20
1,224
1,115
893.25
1,252
1,185
893.30
1,280
1,255
893.35
1,309
1,324
893.40
1,337
1,394
893.45
1,366
1,464
893.50
1,394
1,533
893.55
1,422
1,603
893.60
1,451
1,673
893.65
1,479
1,742
893.70
1,508
1,812
893.75
1,536
1,882
893.80
1,564
1,952
893.85
1,593
2,021
893.90
1,621
2,091
893.95
1,650
2,161
894.00
1,678
2,230
894.05
1,699
2,325
894.10
1,720
2,419
894.15
1,741
2,514
894.20
1,762
2,608
894.25
1,783
2,702
894.30
1,804
2,797
894.35
1,825
2,891
894.40
1,846
2,986
894.45
1,867
3,080
894.50
1,888
3,174
894.55
1,909
3,269
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
894.60
1,930
3,363
894.65
1,951
3,458
894.70
1,972
3,552
894.75
1,993
3,646
894.80
2,014
3,741
894.85
2,035
3,835
894.90
2,056
3,930
894.95
2,077
4,024
895.00
2,098
4,118

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 36
Summary for Pond 5P: Flow Splitter
[57] Hint: Peaked at 893.56' (Flood elevation advised)
Inflow Area = 2.510 ac, 27.89% Impervious, Inflow Depth = 1.35" for 2-yr 24-hr event
Inflow =
5.99 cfs @
11.96 hrs,
Volume=
0.282 of
Outflow =
5.99 cfs @
11.96 hrs,
Volume=
0.282 af, Atten= 0%, Lag= 0.0 min
Primary =
2.78 cfs @
11.96 hrs,
Volume=
0.222 of
Secondary =
3.21 cfs @
11.96 hrs,
Volume=
0.060 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 893.56' @ 11.96 hrs
Device Routina Invert Outlet Devices
#1 Primary 892.43' 12.0" Round Culvert
L= 26.7' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.43' / 892.23' S= 0.0075'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf
#2 Secondary 892.35' 24.0" Round Culvert
L= 129.4' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.35' / 880.00' S= 0.0954'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 3.14 sf
#3 Device 2 892.75' 1.5' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=2.71 cfs @ 11.96 hrs HW=893.54' (Free Discharge)
L1=Culvert (Barrel Controls 2.71 cfs @ 3.87 fps)
Secondary OutFlow Max=3.09 cfs @ 11.96 hrs HW=893.54' (Free Discharge)
L2=Culvert (Passes 3.09 cfs of 7.26 cfs potential flow)
L3=Sharp -Crested Rectangular Weir(Weir Controls 3.09 cfs @ 2.91 fps)

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 37
Pond 5P: Flow Splitter
Hyd rog raph
- -L -'--L-1-J-L-1--1-L-L-'-L--L-L-LIL-L-'-L-LIL-LIL-L-L
_I 5.99 cfs i i i i i i i i i i i i
5.99 cfs ''Inflow �'�Aroa-2.5�l'10 I,la�lc��'
6 P'elalclr�V=$'I
5
4
N
V I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
3.21 cfs fs
3
LL
_I_--—----—--—--—--—--—--—---I—--—II-
2 II
0 2 4 6 8 10 1214 1618 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)
❑ InflowOutflow
El Primary
Secondary

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 38
Hydrograph for Pond 5P: Flow Splitter
Time
Inflow
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
892.35
0.00
0.00
0.00
2.50
0.00
892.35
0.00
0.00
0.00
5.00
0.00
892.35
0.00
0.00
0.00
7.50
0.00
892.35
0.00
0.00
0.00
10.00
0.03
892.52
0.03
0.03
0.00
12.50
0.55
892.81
0.55
0.48
0.07
15.00
0.17
892.65
0.17
0.17
0.00
17.50
0.12
892.61
0.12
0.12
0.00
20.00
0.08
892.58
0.08
0.08
0.00
22.50
0.07
892.57
0.07
0.07
0.00
25.00
0.00
892.43
0.00
0.00
0.00
27.50
0.00
892.43
0.00
0.00
0.00
30.00
0.00
892.43
0.00
0.00
0.00
32.50
0.00
892.43
0.00
0.00
0.00
35.00
0.00
892.43
0.00
0.00
0.00
37.50
0.00
892.43
0.00
0.00
0.00
40.00
0.00
892.43
0.00
0.00
0.00
42.50
0.00
892.43
0.00
0.00
0.00
45.00
0.00
892.43
0.00
0.00
0.00
47.50
0.00
892.43
0.00
0.00
0.00
50.00
0.00
892.43
0.00
0.00
0.00
52.50
0.00
892.43
0.00
0.00
0.00
55.00
0.00
892.43
0.00
0.00
0.00
57.50
0.00
892.43
0.00
0.00
0.00
60.00
0.00
892.43
0.00
0.00
0.00
62.50
0.00
892.43
0.00
0.00
0.00
65.00
0.00
892.43
0.00
0.00
0.00
67.50
0.00
892.43
0.00
0.00
0.00
70.00
0.00
892.43
0.00
0.00
0.00

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 39
Stage -Discharge for Pond 5P: Flow Splitter
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
892.35
0.00
0.00
0.00
892.37
0.00
0.00
0.00
892.39
0.00
0.00
0.00
892.41
0.00
0.00
0.00
892.43
0.00
0.00
0.00
892.45
0.00
0.00
0.00
892.47
0.01
0.01
0.00
892.49
0.01
0.01
0.00
892.51
0.02
0.02
0.00
892.53
0.04
0.04
0.00
892.55
0.05
0.05
0.00
892.57
0.07
0.07
0.00
892.59
0.09
0.09
0.00
892.61
0.12
0.12
0.00
892.63
0.15
0.15
0.00
892.65
0.17
0.17
0.00
892.67
0.21
0.21
0.00
892.69
0.24
0.24
0.00
892.71
0.28
0.28
0.00
892.73
0.31
0.31
0.00
892.75
0.35
0.35
0.00
892.77
0.41
0.40
0.01
892.79
0.48
0.44
0.04
892.81
0.56
0.48
0.07
892.83
0.64
0.53
0.11
892.85
0.73
0.58
0.15
892.87
0.83
0.63
0.20
892.89
0.93
0.68
0.25
892.91
1.04
0.73
0.31
892.93
1.15
0.79
0.37
892.95
1.27
0.84
0.43
892.97
1.39
0.90
0.49
892.99
1.52
0.96
0.56
893.01
1.64
1.02
0.63
893.03
1.78
1.08
0.70
893.05
1.91
1.14
0.77
893.07
2.05
1.20
0.85
893.09
2.19
1.26
0.93
893.11
2.33
1.32
1.01
893.13
2.48
1.39
1.09
893.15
2.63
1.45
1.17
893.17
2.78
1.52
1.26
893.19
2.93
1.58
1.35
893.21
3.09
1.65
1.44
893.23
3.24
1.71
1.53
893.25
3.40
1.78
1.62
893.27
3.56
1.85
1.71
893.29
3.72
1.91
1.81
893.31
3.88
1.98
1.90
893.33
4.05
2.05
2.00
893.35
4.21
2.11
2.10
893.37
4.37
2.18
2.20
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
893.39
4.54
2.24
2.30
893.41
4.71
2.31
2.40
893.43
4.87
2.37
2.50
893.45
5.04
2.44
2.60
893.47
5.21
2.50
2.71
893.49
5.37
2.56
2.81
893.51
5.54
2.62
2.92
893.53
5.70
2.68
3.03
893.55
5.87
2.73
3.14
893.57
6.03
2.79
3.24
893.59
6.20
2.84
3.35
893.61
6.36
2.89
3.46
893.63
6.51
2.94
3.57
893.65
6.67
2.98
3.69
893.67
6.82
3.02
3.80
893.69
6.97
3.06
3.91
893.71
7.11
3.09
4.02
893.73
7.25
3.11
4.14
893.75
7.37
3.12
4.25
893.77
7.48
3.11
4.37
893.79
7.65
3.17
4.48
893.81
7.82
3.23
4.60
893.83
7.99
3.28
4.71
893.85
8.16
3.34
4.83
893.87
8.33
3.39
4.95
893.89
8.50
3.44
5.06
893.91
8.67
3.49
5.18
893.93
8.84
3.54
5.30
893.95
9.01
3.59
5.42
893.97
9.18
3.64
5.53
893.99
9.35
3.69
5.65
894.01
9.51
3.74
5.77
894.03
9.68
3.79
5.89
894.05
9.85
3.84
6.01
894.07
10.01
3.88
6.13
894.09
10.18
3.93
6.25
894.11
10.34
3.97
6.37
894.13
10.51
4.02
6.49
894.15
10.67
4.06
6.61
894.17
10.83
4.11
6.73
894.19
11.00
4.15
6.85
894.21
11.16
4.19
6.97
894.23
11.32
4.24
7.09
894.25
11.49
4.28
7.21
894.27
11.65
4.32
7.33
894.29
11.81
4.36
7.45
894.31
11.97
4.40
7.57
894.33
12.13
4.44
7.69
894.35
12.29
4.48
7.81

6028_Sand Filter Type 11 24-hr 2-yr 24-hr Rainfall=3.45"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 40
Elevation
Storage
(feet)
(cubic -feet)
892.35
0
892.37
0
892.39
0
892.41
0
892.43
0
892.45
0
892.47
0
892.49
0
892.51
0
892.53
0
892.55
0
892.57
0
892.59
0
892.61
0
892.63
0
892.65
0
892.67
0
892.69
0
892.71
0
892.73
0
892.75
0
892.77
0
892.79
0
892.81
0
892.83
0
892.85
0
892.87
0
892.89
0
892.91
0
892.93
0
892.95
0
892.97
0
892.99
0
893.01
0
893.03
0
893.05
0
893.07
0
893.09
0
893.11
0
893.13
0
893.15
0
893.17
0
893.19
0
893.21
0
893.23
0
893.25
0
893.27
0
893.29
0
893.31
0
893.33
0
893.35
0
893.37
0
Stage -Area -Storage for Pond 5P: Flow Splitter
Elevation
Storage
(feet)
(cubic -feet)
893.39
0
893.41
0
893.43
0
893.45
0
893.47
0
893.49
0
893.51
0
893.53
0
893.55
0
893.57
0
893.59
0
893.61
0
893.63
0
893.65
0
893.67
0
893.69
0
893.71
0
893.73
0
893.75
0
893.77
0
893.79
0
893.81
0
893.83
0
893.85
0
893.87
0
893.89
0
893.91
0
893.93
0
893.95
0
893.97
0
893.99
0
894.01
0
894.03
0
894.05
0
894.07
0
894.09
0
894.11
0
894.13
0
894.15
0
894.17
0
894.19
0
894.21
0
894.23
0
894.25
0
894.27
0
894.29
0
894.31
0
894.33
0
894.35
0

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 41
Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment1S: Pre-developmentArea Runoff Area=2.000 ac 7.00% Impervious Runoff Depth=3.65"
Flow Length=422' Tc=13.4 min CN=87 Runoff=9.64 cfs 0.609 of
Subcatchment2S: Post-developmentto Runoff Area=0.810 ac 8.64% Impervious Runoff Depth=1.64"
Tc=10.0 min CN=64 Runoff=1.96 cfs 0.111 of
Subcatchment4S: Post -development Runoff Area=1.190 ac 58.82% Impervious Runoff Depth=3.26"
Tc=5.0 min CN=83 Runoff=6.81 cfs 0.323 of
Subcatchment6S: Post -development Runoff Area=1.320 ac 0.00% Impervious Runoff Depth=2.02"
Tc=5.0 min CN=69 Runoff=4.81 cfs 0.223 of
Pond 3P: Sand Filter Peak EIev=894.70' Storage=3,555 cf Inflow=5.95 cfs 0.498 of
Outflow=5.85 cfs 0.498 of
Pond 5P: Flow Splitter Peak EIev=894.26' Inflow=11.61 cfs 0.545 of
Primary=4.31 cfs 0.388 of Secondary=7.30 cfs 0.158 of Outflow=11.61 cfs 0.545 of
Total Runoff Area = 5.320 ac Runoff Volume = 1.265 of Average Runoff Depth = 2.85"
82.89% Pervious = 4.410 ac 17.11% Impervious = 0.910 ac

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 42
Summary for Subcatchment 1S: Pre -development Area
50% woods & 50% pasture
Runoff = 9.64 cfs @ 12.05 hrs, Volume= 0.609 af, Depth= 3.65"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 10-yr 24-hr Rainfall=5.09"
Area (ac)
CN
Description
0.140
98
Paved parking, HSG B
1.860
86
Fallow, bare soil, HSG B
2.000
87
Weighted Average
1.860
93.00% Pervious Area
0.140
7.00% Impervious Area
Tc
Length
Slope
Velocity Capacity
Description
(min)
(feet)
(ft/ft)
(ft/sec) (cfs)
12.2
100
0.0270
0.14
Sheet Flow,
n= 0.240 P2= 3.45"
1.2
322
0.0712
4.30
Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
13.4 422 Total
Subcatchment 1S: Pre -development Area
Hydrograph
�-��--�--�--�--�--�-L,-L,-I�,--I�,--I�,--�--�--�--�--�--�-L,-L,-L,-L,-I�,--�--��--I�--�--�--I�--��-L,-L,-�--�--�--�-- ■Runoff
10 9.64 cfs
++ L L L L L L L Ty�pq �l 24- �
s r h0+Yrr Z4-�i�'aahNl�-S,D9��- T-r-i--i- - -- T-T-T---------i--i- - -
Ruhoff A�rlew-2.00© aC
7 Rubbff VdUhie'0.609 'af
N 6- Run6ff Oep';t&3.65"
0 5 I;F',low length=42'21
aI
—
L-- -- —I— — ——1—L—L—IL---------I—L— —— T— L— L— L--I—I J_L + +_'_LOn
_
-T-Ir---li--T-T-T-T-T-T-T-T-li--li--li-T-T-T-T-T-T-T-Ir-Ir-li-T-T-T-7t►ilV _8
3
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 43
Hydrograph for Subcatchment 1S: Pre -development Area
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.18
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.32
0.00
0.00
6.00
0.41
0.01
0.02
7.00
0.50
0.02
0.04
8.00
0.61
0.05
0.07
9.00
0.75
0.10
0.12
10.00
0.92
0.18
0.18
11.00
1.20
0.34
0.38
12.00
3.37
2.07
8.79
13.00
3.93
2.57
0.67
14.00
4.17
2.80
0.39
15.00
4.34
2.95
0.30
16.00
4.48
3.08
0.23
17.00
4.59
3.18
0.20
18.00
4.69
3.27
0.18
19.00
4.77
3.35
0.15
20.00
4.85
3.42
0.13
21.00
4.91
3.48
0.12
22.00
4.97
3.54
0.12
23.00
5.03
3.60
0.11
24.00
5.09
3.65
0.11
25.00
5.09
3.65
0.00
26.00
5.09
3.65
0.00
27.00
5.09
3.65
0.00
28.00
5.09
3.65
0.00
29.00
5.09
3.65
0.00
30.00
5.09
3.65
0.00
31.00
5.09
3.65
0.00
32.00
5.09
3.65
0.00
33.00
5.09
3.65
0.00
34.00
5.09
3.65
0.00
35.00
5.09
3.65
0.00
36.00
5.09
3.65
0.00
37.00
5.09
3.65
0.00
38.00
5.09
3.65
0.00
39.00
5.09
3.65
0.00
40.00
5.09
3.65
0.00
41.00
5.09
3.65
0.00
42.00
5.09
3.65
0.00
43.00
5.09
3.65
0.00
44.00
5.09
3.65
0.00
45.00
5.09
3.65
0.00
46.00
5.09
3.65
0.00
47.00
5.09
3.65
0.00
48.00
5.09
3.65
0.00
49.00
5.09
3.65
0.00
50.00
5.09
3.65
0.00
51.00
5.09
3.65
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
5.09
3.65
0.00
53.00
5.09
3.65
0.00
54.00
5.09
3.65
0.00
55.00
5.09
3.65
0.00
56.00
5.09
3.65
0.00
57.00
5.09
3.65
0.00
58.00
5.09
3.65
0.00
59.00
5.09
3.65
0.00
60.00
5.09
3.65
0.00
61.00
5.09
3.65
0.00
62.00
5.09
3.65
0.00
63.00
5.09
3.65
0.00
64.00
5.09
3.65
0.00
65.00
5.09
3.65
0.00
66.00
5.09
3.65
0.00
67.00
5.09
3.65
0.00
68.00
5.09
3.65
0.00
69.00
5.09
3.65
0.00
70.00
5.09
3.65
0.00
71.00
5.09
3.65
0.00
72.00
5.09
3.65
0.00

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 44
Summary for Subcatchment 2S: Post -development to Basin
Runoff = 1.96 cfs @ 12.03 hrs, Volume= 0.111 af, Depth= 1.64"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 10-yr 24-hr Rainfall=5.09"
Area (ac) CN Description
0.070 98 Paved parking, HSG B
0.740 61 >75% Grass cover, Good, HSG B
0.810 64 Weighted Average
0.740 91.36% Pervious Area
0.070 8.64% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
10.0 Direct Entry, User
Subcatchment 2S: Post -development to Basin
Hyd rog raph
�-�--�-�-�-�-�-�-�-�-�-�--�--�-�-�-�-�-�-�-�-�--�--�-� � � � � � � � ■Runoff
1.96 cfs
2 Tipp 24-6 r
I I I I I I I I I 1�101yr 24-hr, Rahn a11=5;09"
11111111111111111
Rtihoff Arrew-70.810 aC
Ru'�nbff V6hitnd"6.411 'af
runoff Oep';t1i=',1:64,!
�CIN-��4
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 45
Hydrograph for Subcatchment 2S: Post -development to Basin
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.18
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.32
0.00
0.00
6.00
0.41
0.00
0.00
7.00
0.50
0.00
0.00
8.00
0.61
0.00
0.00
9.00
0.75
0.00
0.00
10.00
0.92
0.00
0.00
11.00
1.20
0.00
0.00
12.00
3.37
0.64
1.90
13.00
3.93
0.93
0.16
14.00
4.17
1.07
0.10
15.00
4.34
1.17
0.08
16.00
4.48
1.25
0.06
17.00
4.59
1.32
0.05
18.00
4.69
1.38
0.05
19.00
4.77
1.44
0.04
20.00
4.85
1.48
0.04
21.00
4.91
1.52
0.03
22.00
4.97
1.56
0.03
23.00
5.03
1.60
0.03
24.00
5.09
1.64
0.03
25.00
5.09
1.64
0.00
26.00
5.09
1.64
0.00
27.00
5.09
1.64
0.00
28.00
5.09
1.64
0.00
29.00
5.09
1.64
0.00
30.00
5.09
1.64
0.00
31.00
5.09
1.64
0.00
32.00
5.09
1.64
0.00
33.00
5.09
1.64
0.00
34.00
5.09
1.64
0.00
35.00
5.09
1.64
0.00
36.00
5.09
1.64
0.00
37.00
5.09
1.64
0.00
38.00
5.09
1.64
0.00
39.00
5.09
1.64
0.00
40.00
5.09
1.64
0.00
41.00
5.09
1.64
0.00
42.00
5.09
1.64
0.00
43.00
5.09
1.64
0.00
44.00
5.09
1.64
0.00
45.00
5.09
1.64
0.00
46.00
5.09
1.64
0.00
47.00
5.09
1.64
0.00
48.00
5.09
1.64
0.00
49.00
5.09
1.64
0.00
50.00
5.09
1.64
0.00
51.00
5.09
1.64
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
5.09
1.64
0.00
53.00
5.09
1.64
0.00
54.00
5.09
1.64
0.00
55.00
5.09
1.64
0.00
56.00
5.09
1.64
0.00
57.00
5.09
1.64
0.00
58.00
5.09
1.64
0.00
59.00
5.09
1.64
0.00
60.00
5.09
1.64
0.00
61.00
5.09
1.64
0.00
62.00
5.09
1.64
0.00
63.00
5.09
1.64
0.00
64.00
5.09
1.64
0.00
65.00
5.09
1.64
0.00
66.00
5.09
1.64
0.00
67.00
5.09
1.64
0.00
68.00
5.09
1.64
0.00
69.00
5.09
1.64
0.00
70.00
5.09
1.64
0.00
71.00
5.09
1.64
0.00
72.00
5.09
1.64
0.00

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 46
Summary for Subcatchment 4S: Post -development On -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 6.81 cfs @ 11.95 hrs, Volume= 0.323 af, Depth= 3.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 10-yr 24-hr Rainfall=5.09"
Area (ac) CN Description
0.700 98 Paved parking, HSG B
0.490 61 >75% Grass cover, Good, HSG B
1.190 83 Weighted Average
0.490 41.18% Pervious Area
0.700 58.82% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, User
Subcatchment 4S: Post -development On -site
Hydrograph
I I I I ■Runoff
7 6.81 cfs
Tipip � 11124_h r
- -I--I- - - - - - ----I--I- - - - -+10 yr 24 r F 4. 4f�4=1,5;091
6
-' ---'I- - - - -4-I -I-----'I- --4-4-I- -I -ft ftoff Arm=4A9II-aC-
5 Ru'h6ff V61UM6"O'1.323 'af
11111111111111111
1 � I
V 4
-Ru noff ieph=12"; -
LL --I--I—---------- ———---_——I_I------------ _I —_I —I
Yc_=$.O Min
3 C�=$
2
1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 47
Hydrograph for Subcatchment 4S: Post -development On -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.18
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.32
0.00
0.00
6.00
0.41
0.00
0.00
7.00
0.50
0.00
0.01
8.00
0.61
0.02
0.02
9.00
0.75
0.05
0.05
10.00
0.92
0.10
0.08
11.00
1.20
0.22
0.20
12.00
3.37
1.75
5.85
13.00
3.93
2.23
0.34
14.00
4.17
2.44
0.21
15.00
4.34
2.59
0.16
16.00
4.48
2.71
0.13
17.00
4.59
2.81
0.11
18.00
4.69
2.89
0.10
19.00
4.77
2.97
0.09
20.00
4.85
3.03
0.07
21.00
4.91
3.09
0.07
22.00
4.97
3.15
0.07
23.00
5.03
3.20
0.06
24.00
5.09
3.26
0.06
25.00
5.09
3.26
0.00
26.00
5.09
3.26
0.00
27.00
5.09
3.26
0.00
28.00
5.09
3.26
0.00
29.00
5.09
3.26
0.00
30.00
5.09
3.26
0.00
31.00
5.09
3.26
0.00
32.00
5.09
3.26
0.00
33.00
5.09
3.26
0.00
34.00
5.09
3.26
0.00
35.00
5.09
3.26
0.00
36.00
5.09
3.26
0.00
37.00
5.09
3.26
0.00
38.00
5.09
3.26
0.00
39.00
5.09
3.26
0.00
40.00
5.09
3.26
0.00
41.00
5.09
3.26
0.00
42.00
5.09
3.26
0.00
43.00
5.09
3.26
0.00
44.00
5.09
3.26
0.00
45.00
5.09
3.26
0.00
46.00
5.09
3.26
0.00
47.00
5.09
3.26
0.00
48.00
5.09
3.26
0.00
49.00
5.09
3.26
0.00
50.00
5.09
3.26
0.00
51.00
5.09
3.26
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
5.09
3.26
0.00
53.00
5.09
3.26
0.00
54.00
5.09
3.26
0.00
55.00
5.09
3.26
0.00
56.00
5.09
3.26
0.00
57.00
5.09
3.26
0.00
58.00
5.09
3.26
0.00
59.00
5.09
3.26
0.00
60.00
5.09
3.26
0.00
61.00
5.09
3.26
0.00
62.00
5.09
3.26
0.00
63.00
5.09
3.26
0.00
64.00
5.09
3.26
0.00
65.00
5.09
3.26
0.00
66.00
5.09
3.26
0.00
67.00
5.09
3.26
0.00
68.00
5.09
3.26
0.00
69.00
5.09
3.26
0.00
70.00
5.09
3.26
0.00
71.00
5.09
3.26
0.00
72.00
5.09
3.26
0.00

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 48
Summary for Subcatchment 6S: Post -development Off -site
[49] Hint: Tc<2dt may require smaller dt
Runoff = 4.81 cfs @ 11.96 hrs, Volume= 0.223 af, Depth= 2.02"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr 10-yr 24-hr Rainfall=5.09"
Area (ac) CN Description
1.320 69 50-75% Grass cover, Fair, HSG B
1.320 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, User
Subcatchment 6S: Post -development Off -site
Hydrograph
-I--I--I--I--I-II- �I - �I - II-I--I--I--I--I--I- III- III - �I - II -I�-I--I--I--I--I--II- III - �I - II -I�-I--I--I--I--I- ❑Runoff
5 4.81 cfs
tyllpq I I'24-hr
- --II -! -! -! - ----II-; -7-! -! 11II-y1r-2 r� it f�a�=1115,109 ,-
4 Ruhoffl Anew-71.320 aC
IRu'Inbff V61Wnd"6.223 'af
N 3 Runoff Deplth=;'2.102"
LL
Yc= 0i�l
2 `+ C Q
1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 49
Hydrograph for Subcatchment 6S: Post -development Off -site
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
0.00
0.00
0.00
0.00
1.00
0.05
0.00
0.00
2.00
0.11
0.00
0.00
3.00
0.18
0.00
0.00
4.00
0.24
0.00
0.00
5.00
0.32
0.00
0.00
6.00
0.41
0.00
0.00
7.00
0.50
0.00
0.00
8.00
0.61
0.00
0.00
9.00
0.75
0.00
0.00
10.00
0.92
0.00
0.00
11.00
1.20
0.02
0.05
12.00
3.37
0.88
4.30
13.00
3.93
1.22
0.28
14.00
4.17
1.38
0.17
15.00
4.34
1.50
0.14
16.00
4.48
1.59
0.11
17.00
4.59
1.66
0.10
18.00
4.69
1.73
0.09
19.00
4.77
1.79
0.08
20.00
4.85
1.85
0.06
21.00
4.91
1.89
0.06
22.00
4.97
1.94
0.06
23.00
5.03
1.98
0.06
24.00
5.09
2.02
0.05
25.00
5.09
2.02
0.00
26.00
5.09
2.02
0.00
27.00
5.09
2.02
0.00
28.00
5.09
2.02
0.00
29.00
5.09
2.02
0.00
30.00
5.09
2.02
0.00
31.00
5.09
2.02
0.00
32.00
5.09
2.02
0.00
33.00
5.09
2.02
0.00
34.00
5.09
2.02
0.00
35.00
5.09
2.02
0.00
36.00
5.09
2.02
0.00
37.00
5.09
2.02
0.00
38.00
5.09
2.02
0.00
39.00
5.09
2.02
0.00
40.00
5.09
2.02
0.00
41.00
5.09
2.02
0.00
42.00
5.09
2.02
0.00
43.00
5.09
2.02
0.00
44.00
5.09
2.02
0.00
45.00
5.09
2.02
0.00
46.00
5.09
2.02
0.00
47.00
5.09
2.02
0.00
48.00
5.09
2.02
0.00
49.00
5.09
2.02
0.00
50.00
5.09
2.02
0.00
51.00
5.09
2.02
0.00
Time Precip. Excess Runoff
(hours)
(inches)
(inches)
(cfs)
52.00
5.09
2.02
0.00
53.00
5.09
2.02
0.00
54.00
5.09
2.02
0.00
55.00
5.09
2.02
0.00
56.00
5.09
2.02
0.00
57.00
5.09
2.02
0.00
58.00
5.09
2.02
0.00
59.00
5.09
2.02
0.00
60.00
5.09
2.02
0.00
61.00
5.09
2.02
0.00
62.00
5.09
2.02
0.00
63.00
5.09
2.02
0.00
64.00
5.09
2.02
0.00
65.00
5.09
2.02
0.00
66.00
5.09
2.02
0.00
67.00
5.09
2.02
0.00
68.00
5.09
2.02
0.00
69.00
5.09
2.02
0.00
70.00
5.09
2.02
0.00
71.00
5.09
2.02
0.00
72.00
5.09
2.02
0.00

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 50
Summary for Pond 3P: Sand Filter
[81] Warning: Exceeded Pond 5P by 1.66' @ 13.70 hrs
Inflow Area = 3.320 ac, 23.19% Impervious, Inflow Depth = 1.80" for 10-yr 24-hr event
Inflow = 5.95 cfs @ 11.98 hrs, Volume= 0.498 of
Outflow = 5.85 cfs @ 12.00 hrs, Volume= 0.498 af, Atten= 2%, Lag= 1.0 min
Primary = 5.85 cfs @ 12.00 hrs, Volume= 0.498 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 894.70' @ 12.00 hrs Surf.Area= 1,973 sf Storage= 3,555 cf
Plug -Flow detention time= 165.2 min calculated for 0.498 of (100% of inflow)
Center -of -Mass det. time= 164.8 min ( 1,029.4 - 864.6 )
Volume Invert
#1 892.00'
Description
4,118 cf Custom Stage Data (Prismatic)-isted below
Elevation
Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft)
(cubic -feet) (cubic -feet)
892.00
396
0 0
892.30
777
176 176
893.00
1,110
660 836
894.00
1,678
1,394 2,230
895.00
2,098
1,888 4,118
Device Routing
Invert
Outlet Devices
#1 Primary
888.06'
15.0" Round Culvert
L= 87.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 888.06' / 880.56' S= 0.0858'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 1.23 sf
#2 Device 1
892.00'
Special & User -Defined
Elev. (feet) 892.00 893.00 894.00 895.00
Disch. (cfs) 0.000 0.022 0.028 0.034
#3 Device 1
893.84'
11.4" W x 1.9" H Vert. Orifice/Grate C= 0.600
#4 Device 1
894.44'
35.6" x 35.4" Horiz. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Primary
894.75'
28.0' long Sharp -Crested Rectangular Weir End Contraction(s)
Primary OutFlow Max=5.80 cfs @ 12.00 hrs HW=894.70' (Free Discharge)
1=Culvert (Passes 5.80 cfs of 18.11 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.03 cfs)
3=Orifice/Grate (Orifice Controls 0.64 cfs @ 4.25 fps)
4=Orifice/Grate (Weir Controls 5.13 cfs @ 1.67 fps)
=Sharp -Crested Rectangular Weir( Controls 0.00 cfs)

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 51
Pond 3P: Sand Filter
Hyd rog raph
sss ots —1_ _1 _1 _ _ 1 ❑ I nflow
--i _1__1 i_i--i _1__1 _1 i_i--i _1__1 i_i _1__1__1 _1 i_i--
I I I I I I I I I I I I I I I I I I I I I I I I 1 ❑Primary
6 ' IIIII--III-�15-.85cfs Inflo'w+Al� rera=�v311
:$ 1132/0�T_ • 1a&
II1IIlIe11I
-1 1 1 1 1 1 1 I I I I-IRIea
5 1Stbra�e=3.555ef ,I,I -
-
4
y I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
U J_______1_L_L____J_1_L_L_I__I__I_L_L_L—I--I_J_1_L_L
3 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I
0 3
LL
—1--1—r——
r—r�—r— r—r—r—l—r— r— 7�—r—r—
2
fI////////////% ��"""%///////////////////////////////////////////////////////M14,

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 52
Hydrograph for Pond 3P: Sand Filter
Time
Inflow
Storage
Elevation
Primary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
0.00
0.00
0
892.00
0.00
2.50
0.00
0
892.00
0.00
5.00
0.00
0
892.00
0.00
7.50
0.02
36
892.06
0.00
10.00
0.08
367
892.50
0.01
12.50
0.97
3,158
894.49
1.03
15.00
0.38
2,732
894.27
0.46
17.50
0.25
2,293
894.03
0.27
20.00
0.17
2,195
893.97
0.18
22.50
0.16
2,176
893.96
0.16
25.00
0.00
1,993
893.83
0.03
27.50
0.00
1,755
893.66
0.03
30.00
0.00
1,526
893.49
0.02
32.50
0.00
1,306
893.34
0.02
35.00
0.00
1,094
893.18
0.02
37.50
0.00
890
893.04
0.02
40.00
0.00
702
892.86
0.02
42.50
0.00
549
892.70
0.02
45.00
0.00
425
892.56
0.01
47.50
0.00
324
892.46
0.01
50.00
0.00
242
892.37
0.01
52.50
0.00
176
892.30
0.01
55.00
0.00
126
892.21
0.00
57.50
0.00
90
892.15
0.00
60.00
0.00
64
892.11
0.00
62.50
0.00
46
892.08
0.00
65.00
0.00
33
892.06
0.00
67.50
0.00
23
892.04
0.00
70.00
0.00
17
892.03
0.00

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 53
Elevation Primary
(feet)
(cfs)
892.00
0.00
892.02
0.00
892.04
0.00
892.06
0.00
892.08
0.00
892.10
0.00
892.12
0.00
892.14
0.00
892.16
0.00
892.18
0.00
892.20
0.00
892.22
0.00
892.24
0.01
892.26
0.01
892.28
0.01
892.30
0.01
892.32
0.01
892.34
0.01
892.36
0.01
892.38
0.01
892.40
0.01
892.42
0.01
892.44
0.01
892.46
0.01
892.48
0.01
892.50
0.01
892.52
0.01
892.54
0.01
892.56
0.01
892.58
0.01
892.60
0.01
892.62
0.01
892.64
0.01
892.66
0.01
892.68
0.01
892.70
0.02
892.72
0.02
892.74
0.02
892.76
0.02
892.78
0.02
892.80
0.02
892.82
0.02
892.84
0.02
892.86
0.02
892.88
0.02
892.90
0.02
892.92
0.02
892.94
0.02
892.96
0.02
892.98
0.02
893.00
0.02
893.02
0.02
Stage -Discharge for Pond 3P: Sand Filter
Elevation Primary
(feet)
(cfs)
893.04
0.02
893.06
0.02
893.08
0.02
893.10
0.02
893.12
0.02
893.14
0.02
893.16
0.02
893.18
0.02
893.20
0.02
893.22
0.02
893.24
0.02
893.26
0.02
893.28
0.02
893.30
0.02
893.32
0.02
893.34
0.02
893.36
0.02
893.38
0.02
893.40
0.02
893.42
0.02
893.44
0.02
893.46
0.02
893.48
0.02
893.50
0.03
893.52
0.03
893.54
0.03
893.56
0.03
893.58
0.03
893.60
0.03
893.62
0.03
893.64
0.03
893.66
0.03
893.68
0.03
893.70
0.03
893.72
0.03
893.74
0.03
893.76
0.03
893.78
0.03
893.80
0.03
893.82
0.03
893.84
0.03
893.86
0.04
893.88
0.05
893.90
0.07
893.92
0.10
893.94
0.12
893.96
0.15
893.98
0.19
894.00
0.22
894.02
0.25
894.04
0.28
894.06
0.30
Elevation Primary
(feet)
(cfs)
894.08
0.32
894.10
0.33
894.12
0.35
894.14
0.37
894.16
0.38
894.18
0.40
894.20
0.41
894.22
0.43
894.24
0.44
894.26
0.45
894.28
0.46
894.30
0.48
894.32
0.49
894.34
0.50
894.36
0.51
894.38
0.52
894.40
0.53
894.42
0.54
894.44
0.55
894.46
0.67
894.48
0.88
894.50
1.15
894.52
1.47
894.54
1.83
894.56
2.22
894.58
2.65
894.60
3.11
894.62
3.59
894.64
4.11
894.66
4.65
894.68
5.21
894.70
5.80
894.72
6.41
894.74
7.05
894.76
7.79
894.78
8.85
894.80
10.09
894.82
11.48
894.84
12.99
894.86
14.61
894.88
16.32
894.90
18.14
894.92
20.04
894.94
22.02
894.96
24.08
894.98
26.22
895.00
28.43

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 54
Stage -Area -Storage for Pond 3P: Sand Filter
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
892.00
396
0
892.05
459
29
892.10
523
59
892.15
586
88
892.20
650
117
892.25
713
147
892.30
777
176
892.35
801
223
892.40
825
270
892.45
848
317
892.50
872
365
892.55
896
412
892.60
920
459
892.65
943
506
892.70
967
553
892.75
991
601
892.80
1,015
648
892.85
1,039
695
892.90
1,062
742
892.95
1,086
789
893.00
1,110
836
893.05
1,138
906
893.10
1,167
976
893.15
1,195
1,045
893.20
1,224
1,115
893.25
1,252
1,185
893.30
1,280
1,255
893.35
1,309
1,324
893.40
1,337
1,394
893.45
1,366
1,464
893.50
1,394
1,533
893.55
1,422
1,603
893.60
1,451
1,673
893.65
1,479
1,742
893.70
1,508
1,812
893.75
1,536
1,882
893.80
1,564
1,952
893.85
1,593
2,021
893.90
1,621
2,091
893.95
1,650
2,161
894.00
1,678
2,230
894.05
1,699
2,325
894.10
1,720
2,419
894.15
1,741
2,514
894.20
1,762
2,608
894.25
1,783
2,702
894.30
1,804
2,797
894.35
1,825
2,891
894.40
1,846
2,986
894.45
1,867
3,080
894.50
1,888
3,174
894.55
1,909
3,269
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
894.60
1,930
3,363
894.65
1,951
3,458
894.70
1,972
3,552
894.75
1,993
3,646
894.80
2,014
3,741
894.85
2,035
3,835
894.90
2,056
3,930
894.95
2,077
4,024
895.00
2,098
4,118

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 55
Summary for Pond 5P: Flow Splitter
[57] Hint: Peaked at 894.26' (Flood elevation advised)
Inflow Area = 2.510 ac, 27.89% Impervious, Inflow Depth = 2.61" for 10-yr 24-hr event
Inflow =
11.61 cfs @
11.96 hrs,
Volume=
0.545 of
Outflow =
11.61 cfs @
11.96 hrs,
Volume=
0.545 af, Atten= 0%, Lag= 0.0 min
Primary =
4.31 cfs @
11.96 hrs,
Volume=
0.388 of
Secondary =
7.30 cfs @
11.96 hrs,
Volume=
0.158 of
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 894.26' @ 11.96 hrs
Device Routina Invert Outlet Devices
#1 Primary 892.43' 12.0" Round Culvert
L= 26.7' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.43' / 892.23' S= 0.0075'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf
#2 Secondary 892.35' 24.0" Round Culvert
L= 129.4' CPP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 892.35' / 880.00' S= 0.0954'/' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 3.14 sf
#3 Device 2 892.75' 1.5' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=4.24 cfs @ 11.96 hrs HW=894.23' (Free Discharge)
L1=Culvert (Barrel Controls 4.24 cfs @ 5.40 fps)
Secondary OutFlow Max=7.11 cfs @ 11.96 hrs HW=894.23' (Free Discharge)
L2=Culvert (Passes 7.11 cfs of 14.34 cfs potential flow)
L3=Sharp -Crested Rectangular Weir(Weir Controls 7.11 cfs @ 3.98 fps)

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 56
Pond 5P: Flow Splitter
Hyd rog raph
T — I— 7— T — —I — 7 — 7 — — 7 — 7 — — , — T — 7— T — —I — 7 — 7 — — 7 — 7 — — , — T — I— 7— T —
-'--'-'--'--'-'--'--'-'--'--'--'-'--'--'-'--'--'-'--------------------------'-'--
MInflow
11.61 cfs
--r-r----r-+--r-r--r- �,� F `y,I - r-
slofs III�I)MV 11rG TL.�-1O9C
r Outflow--r�
Primary
13
III
Secondary
12
i T i i - _ _ ' -
i
1 :7 �4.201_
_1_L _L_I_JPLea;k1ell
r--r—r--r—r----r—r—Il—r-rTr—r-Il-r—r-
10
—I—r-r -—r—r----r —rT
9
-I- - -I--I- - - - - - -I- - -I- - -I- - -I--I- -
$
7.30 cfs
w
V 7
7-7—T-7 7-7-7—�—T 7—T-7 7-7-7---T-7—T
0 6
-II-----I-I-I---II-I---II-I�----I-I--I-I-I---II-I---II-I--------I-I-
LL
— cfs_—+—+----+—r--+—r--+—+--+_+----+—r--+—r--+—+--+_+_
4
-I-
3
2
1
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 57
Hydrograph for Pond 5P: Flow Splitter
Time
Inflow
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
892.35
0.00
0.00
0.00
2.50
0.00
892.35
0.00
0.00
0.00
5.00
0.00
892.35
0.00
0.00
0.00
7.50
0.02
892.50
0.02
0.02
0.00
10.00
0.08
892.58
0.08
0.08
0.00
12.50
0.98
892.90
0.98
0.71
0.28
15.00
0.31
892.73
0.31
0.31
0.00
17.50
0.20
892.67
0.20
0.20
0.00
20.00
0.14
892.62
0.14
0.14
0.00
22.50
0.12
892.61
0.12
0.12
0.00
25.00
0.00
892.43
0.00
0.00
0.00
27.50
0.00
892.43
0.00
0.00
0.00
30.00
0.00
892.43
0.00
0.00
0.00
32.50
0.00
892.43
0.00
0.00
0.00
35.00
0.00
892.43
0.00
0.00
0.00
37.50
0.00
892.43
0.00
0.00
0.00
40.00
0.00
892.43
0.00
0.00
0.00
42.50
0.00
892.43
0.00
0.00
0.00
45.00
0.00
892.43
0.00
0.00
0.00
47.50
0.00
892.43
0.00
0.00
0.00
50.00
0.00
892.43
0.00
0.00
0.00
52.50
0.00
892.43
0.00
0.00
0.00
55.00
0.00
892.43
0.00
0.00
0.00
57.50
0.00
892.43
0.00
0.00
0.00
60.00
0.00
892.43
0.00
0.00
0.00
62.50
0.00
892.43
0.00
0.00
0.00
65.00
0.00
892.43
0.00
0.00
0.00
67.50
0.00
892.43
0.00
0.00
0.00
70.00
0.00
892.43
0.00
0.00
0.00

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 58
Stage -Discharge for Pond 5P: Flow Splitter
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
892.35
0.00
0.00
0.00
892.37
0.00
0.00
0.00
892.39
0.00
0.00
0.00
892.41
0.00
0.00
0.00
892.43
0.00
0.00
0.00
892.45
0.00
0.00
0.00
892.47
0.01
0.01
0.00
892.49
0.01
0.01
0.00
892.51
0.02
0.02
0.00
892.53
0.04
0.04
0.00
892.55
0.05
0.05
0.00
892.57
0.07
0.07
0.00
892.59
0.09
0.09
0.00
892.61
0.12
0.12
0.00
892.63
0.15
0.15
0.00
892.65
0.17
0.17
0.00
892.67
0.21
0.21
0.00
892.69
0.24
0.24
0.00
892.71
0.28
0.28
0.00
892.73
0.31
0.31
0.00
892.75
0.35
0.35
0.00
892.77
0.41
0.40
0.01
892.79
0.48
0.44
0.04
892.81
0.56
0.48
0.07
892.83
0.64
0.53
0.11
892.85
0.73
0.58
0.15
892.87
0.83
0.63
0.20
892.89
0.93
0.68
0.25
892.91
1.04
0.73
0.31
892.93
1.15
0.79
0.37
892.95
1.27
0.84
0.43
892.97
1.39
0.90
0.49
892.99
1.52
0.96
0.56
893.01
1.64
1.02
0.63
893.03
1.78
1.08
0.70
893.05
1.91
1.14
0.77
893.07
2.05
1.20
0.85
893.09
2.19
1.26
0.93
893.11
2.33
1.32
1.01
893.13
2.48
1.39
1.09
893.15
2.63
1.45
1.17
893.17
2.78
1.52
1.26
893.19
2.93
1.58
1.35
893.21
3.09
1.65
1.44
893.23
3.24
1.71
1.53
893.25
3.40
1.78
1.62
893.27
3.56
1.85
1.71
893.29
3.72
1.91
1.81
893.31
3.88
1.98
1.90
893.33
4.05
2.05
2.00
893.35
4.21
2.11
2.10
893.37
4.37
2.18
2.20
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
893.39
4.54
2.24
2.30
893.41
4.71
2.31
2.40
893.43
4.87
2.37
2.50
893.45
5.04
2.44
2.60
893.47
5.21
2.50
2.71
893.49
5.37
2.56
2.81
893.51
5.54
2.62
2.92
893.53
5.70
2.68
3.03
893.55
5.87
2.73
3.14
893.57
6.03
2.79
3.24
893.59
6.20
2.84
3.35
893.61
6.36
2.89
3.46
893.63
6.51
2.94
3.57
893.65
6.67
2.98
3.69
893.67
6.82
3.02
3.80
893.69
6.97
3.06
3.91
893.71
7.11
3.09
4.02
893.73
7.25
3.11
4.14
893.75
7.37
3.12
4.25
893.77
7.48
3.11
4.37
893.79
7.65
3.17
4.48
893.81
7.82
3.23
4.60
893.83
7.99
3.28
4.71
893.85
8.16
3.34
4.83
893.87
8.33
3.39
4.95
893.89
8.50
3.44
5.06
893.91
8.67
3.49
5.18
893.93
8.84
3.54
5.30
893.95
9.01
3.59
5.42
893.97
9.18
3.64
5.53
893.99
9.35
3.69
5.65
894.01
9.51
3.74
5.77
894.03
9.68
3.79
5.89
894.05
9.85
3.84
6.01
894.07
10.01
3.88
6.13
894.09
10.18
3.93
6.25
894.11
10.34
3.97
6.37
894.13
10.51
4.02
6.49
894.15
10.67
4.06
6.61
894.17
10.83
4.11
6.73
894.19
11.00
4.15
6.85
894.21
11.16
4.19
6.97
894.23
11.32
4.24
7.09
894.25
11.49
4.28
7.21
894.27
11.65
4.32
7.33
894.29
11.81
4.36
7.45
894.31
11.97
4.40
7.57
894.33
12.13
4.44
7.69
894.35
12.29
4.48
7.81

6028_Sand Filter Type/1 24-hr 10-yr 24-hr Rainfall=5.09"
Prepared by {enter your company name here} Printed 11/10/2020
HydroCAD®10.00-19 s/n 09780 ©2016 HydroCAD Software Solutions LLC Page 59
Elevation
Storage
(feet)
(cubic -feet)
892.35
0
892.37
0
892.39
0
892.41
0
892.43
0
892.45
0
892.47
0
892.49
0
892.51
0
892.53
0
892.55
0
892.57
0
892.59
0
892.61
0
892.63
0
892.65
0
892.67
0
892.69
0
892.71
0
892.73
0
892.75
0
892.77
0
892.79
0
892.81
0
892.83
0
892.85
0
892.87
0
892.89
0
892.91
0
892.93
0
892.95
0
892.97
0
892.99
0
893.01
0
893.03
0
893.05
0
893.07
0
893.09
0
893.11
0
893.13
0
893.15
0
893.17
0
893.19
0
893.21
0
893.23
0
893.25
0
893.27
0
893.29
0
893.31
0
893.33
0
893.35
0
893.37
0
Stage -Area -Storage for Pond 5P: Flow Splitter
Elevation
Storage
(feet)
(cubic -feet)
893.39
0
893.41
0
893.43
0
893.45
0
893.47
0
893.49
0
893.51
0
893.53
0
893.55
0
893.57
0
893.59
0
893.61
0
893.63
0
893.65
0
893.67
0
893.69
0
893.71
0
893.73
0
893.75
0
893.77
0
893.79
0
893.81
0
893.83
0
893.85
0
893.87
0
893.89
0
893.91
0
893.93
0
893.95
0
893.97
0
893.99
0
894.01
0
894.03
0
894.05
0
894.07
0
894.09
0
894.11
0
894.13
0
894.15
0
894.17
0
894.19
0
894.21
0
894.23
0
894.25
0
894.27
0
894.29
0
894.31
0
894.33
0
894.35
0