2024.03.08-Sennebogen Expansion SWM Report

Stormwater Management Report
For
Sennebogen Expansion
1957 Sennebogen Trail, Stanley, NC
Property ID: 3691941330/54664
C4
srouP
ENGINEERS SURVEYORS
Date: March 8, 2024
CES Project #8189
Prepared By: CES Group Engineers, LLP
3525 Whitehall Park Drive, Suite 150
Charlotte, NC 28273
704.489.1500

List of Exhibits:
• Exhibit 1: Drawing Number C1.1 - Pre -development Drainage Area Map
• Exhibit 2: Drawing Number C1.2 - Post -development Drainage Area Map
• Exhibit 3: Stormwater Conveyance Calculations
• Exhibit 4: Stormwater Drainage calculations (Hydro CAD, 2, 10, 25, 50 and 100
Yr storm)
• Exhibit 5: Soil Maps

Protect Description
The proposed project includes the construction of a detached commercial building addition to the two
existing buildings totaling 48,000 sf with the associated parking lot, drives, proposed gravel demonstration
pad, and sand filter. The proposed use of the building will be vehicle services. There is one existing
connection to Sennebogen Trail. There is an existing intermittent stream onsite as determined in the field
by Atlas Environmental Inc. on September 29, 2023 that will be partially impacted by the proposed work.
Pre -Development Conditions
The pre -development site is divided into two drainage areas, DA-1 and DA-2. The DA-1 is 7.60 acres and
has HSG B & D soils, resulting in a CN value 71. DA-1 includes the existing original building truck docks and
a portion of Sennebogen Trail as well as several acres of undeveloped area west of Sennebogen Trail. DA-
1 includes the upstream extents of the existing intermittent stream. The pre -development time of
concentration for DA-1 was calculated to be 20 minutes. DA-2 is 1.34 acres and has HSG B soils which
results in a CN value of 72. DA-2 consists of the northernmost portion of the truck drive in bays,
Sennebogen trail, concrete pad and wooded area. The pre -development time of concentration for DA-2
was calculated to be 8 minutes (see attached Tc calculations).
Pre -development drainage areas summary:
Total
Total
Total Drainage
Area Name
Total Drainage
Impervious
Impervious Tc (Min)
Area (Sf)
Area (Ac)
Area (Sf)
Area (Ac)
DA-1 330,991
7.60
77,146
1.77 20
DA-2 58,307
1.34
23,324
0.54 8
Post -Development Conditions
The post -development site is divided into three drainage areas, DA-1A, DA-113 and DA-2.
The proposed contributing drainage area to the proposed sand filter consists of grass, open space,
proposed buildings, sidewalks, parking lots, drives, and a gravel demonstration pad. For purposes of this
analysis, the drainage area was divided into impervious and open space areas. The post -development
drainage area DA-1 is 8.86 acres. The drainage area has HSG B & D soils which results in a weighted CN
value of 85. The post -development time of concentration was calculated to be 6 minutes.
The proposed sand filter was modeled in HydroCAD. The sand filter will be an above ground facility to
provide water quality treatment of the first 1.0" of rainfall over the entire contributing drainage area
based on the maximum buildout of the site. The sand filter will also control the peak flows from the 1-yr,
2-yr, and 10-yr, 24-hour storm events. The control structure will be a concrete riser with 4'x4' inside
dimensions. The water quality design volume will completely drain through the sand filter. The 1-yr, 2-yr
and 10-yr storms will be controlled with a series or orifices/weirs in the primary riser structure. A 24"W x
8"H rectangular weir will be set at elevation 740.80. A 24"W x 6"H rectangular weir will be set at elevation
742.25. The top of the riser will be set at 744.25 with a top trash rack extending above this elevation.

There will also be a 20' wide emergency spillway on the west side of the embankment which will be lined
with class B riprap with spillway elevation of 744.50. The top of the embankment will be set at 746.00.
The second post -development drainage area that discharges offsite, DA-113 is 0.27 acres and has HSG D
soils which results in a weighted CN value of 80. The post -development time of concentration was
assumed to be 5 minutes. This area includes the pervious areas downstream of the sand filter and
stormwater conveyance system, primarily consisting of the slope down to the outfall.
The third post -development drainage area that discharges offsite, DA-2 is 0.44 acres and has HSG B soils
which results in a weighted CN value of 83. The post -development time of concentration was assumed to
be 5 minutes. This area includes areas of existing parking lot and sidewalks as well as some open space
areas towards the north end of the existing/proposed development.
Post -development drainage areas summary:
Total
Total
Total Drainage
Area Name
Total Drainage
Impervious
Impervious
Tc (Min)
Area (Sf)
Area (Ac)
Area (Sf)
Area (Ac)
DA-1A 385,907
8.86
223,565
5.13
6
DA-113 11,678
0.27
0
0
5
DA-2 19,316
0.44
11,497
0.26
5
STORMWATER MANAGEMENT ANALYSIS -PRE AND POST ANALYSIS
A summary of the pre and post -developed flows for the 2-yr, 10-yr, and 25-yr storm events is included
below. We are able to provide pre -vs post flow reduction for the 2-yr and 10-yr storm events. We've tried
to route as much of the proposed impervious area and overall area through the sand filter as possible.
Summary of pre and post -discharges for DA-1:
2-yr (cfs)
PRE 7.64
POST 6.91
Summary of pre and post -discharges for DA-2:
2-yr (cfs)
PRE 2.24
POST 1.42
Analysis Methodology & Design Parameters
10-yr (cfs) 25-yr (cfs)
17.05 23.23
16.38 26.20
10-yr (cfs) 25-yr (cfs)
4.74 6.35
2.46 3.09
The existing and proposed drainage areas have been analyzed utilizing a modified version of the NRCS
SCS TR-20 method. The analysis program "HydroCAD" Version 10.20 by HydroCAD Software Solutions
LLC was used to calculate and plot the runoff hydrographs. The program incorporates the time of

concentration, CN values, 24-hour rainfall events, and project drainage areas to calculate the runoff
characteristics. IN information from NOAA has been utilized for storm events.
Additional information used in the analysis includes the SCS Unit Hydrograph, a minimum time of
concentration of 5 minutes, separate runoff calculations for impervious and pervious areas, and dynamic
storage and conveyance routing to account for any variable tailwater conditions.
Water Quality Measures
Per the NCDEQ Stormwater Standards, water quality for a high density development is to provide
treatment volume for the 1" storm event. The development proposes one (1) water quality measure to
capture and treat a large portion of the site. The forebay is designed for 85% minimum TSS removal and
is anticipated to treat greater than the 1" storm event for the site. The proposed sand filter system shall
be designed to clean all water entering the system to the satisfaction of NCDEQ. Refer to Exhibit 4 for 1"
stormwater calculations.
Stormwater Conveyance
The proposed stormwater conveyance system consists of both swales and a closed pipe system. The
proposed pipe materials include Type S HDPE, Class III RCP and Class V RCP. The pipe system was sized
utilizing Hydraflow Storm Sewers for the 10-yr storm event. Refer to Exhibit 3 for the stormwater
conveyance calculations.
Soil Erosion Control
The proposed project includes three soil erosion control phases. Phase 1 is to install two rock dams in the
existing stream area and a bypass drainage pipe system to convey the offsite runoff around the majority
of the proposed construction area. Also included are silt fence, silt fence outlets and a riprap apron.
Phase 2 is to add a construction entrance, concrete washout, silt fence, silt fence outlets, temporary
diversion ditches, slope drains and sediment basin. The sediment basin is sized to handle the 10-yr runoff
from approximately 7.85 acres of contributing drainage area.
Phase 3 is to install a second sediment basin in the location of the permanent sand filter. This will allow
the remaining portion of the demonstration pad to be filled and raised to final grade. The upstream
drainage area must be completely stabilized before installing the sand filter system, gravel, and sand to
prevent clogging the system. Riprap aprons at outfalls were sized utilizing the NCDEQ Erosion Control
Design Manual section 6.41 on Outfall Stabilization Structures.

Exhibit 1
Drawing Number C1.1: Pre -development Drainage Area Map

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Rip -Rap Apron Summary Table
Outlet I Discharge I
(cfs) I
Do (in)
Minimum TW Condition
Wi=Do + La W2=3*Do W2
LdS(ft) I La (ft) I Wi (ft) I (ft) I *T(ft)
H=(2/3)*Do
I H (ft)
FES-1 (EC Ph 2) I 23.6 I
24
I 0.5 I
15
I 17.00 I
6.00 I
1.125
I 1.33
FES-100 38.0
30
0.5
17
19.50
7.50
1.125
1.67
FES-500 26.5
30
0.5
20
22.50
7.50
1.125
1.67
I I
I I
I I
I
I
I I
I I
I I
I
I
I I
I I
I I
I
I
dmax=1.5*d50
*T=1.5*dmax (Min. *T=10") Apron Thickness = *T
Min. La=10 ft
H=Depth of apron

Exhibit 4
Stormwater Drainage calculations (Hydro CAD, 2110, 25, 50
and 100 Yr storm)

NRCS TRAVEL TIME CALCULATIONS
DATE: 2/19/2024
Flow Length (ft)
100
PROJECT: Sennebogen
Upstream Elev (ft)
779.7
PROJECT M 8189.0823CD
Downstream Elev (ft)
776.5
DESIGNER: SMC
Mannings n
0.400
CATCHMENT: Pre-Dev to BMP
Slope (ft/ft)
0.032
P2 (in)
3.12
Travel Time, Tt (min)
18.0
TYPE
SHALLOW CONCENTRATED
SECTION
1
2
3
4
5
Flow Length (ft)
382
Upstream Elev (ft)
776.5
Downstream Elev (ft)
736
Surface Type
Unpaved
N/A
N/A
N/A
N/A
Slope (ft/ft)
0.106
N/A
N/A
N/A
N/A
V (ft/s)
5.25
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
1.21
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
1.21
TYPE
OPEN CHANNEL
SECTION
1
2
3
Channel Type
Triangular
N/A
N/A
N/A
N/A
Width, b (ft)
Flow Depth, h (ft)
1
Top Width, T (ft)
Side Slope, z
2
Pipe Dia., D (ft)
Area (ft2)
2.00
N/A
N/A
N/A
N/A
Wetted Perimeter (ft)
4.47
N/A
N/A
N/A
N/A
Hydraulic Radius (ft)
0.45
N/A
N/A
N/A
N/A
Flow Length (ft)
260
Upstream Elev (ft)
736
Downstream Elev (ft)
724
Mannings n
0.035
Slope (ft/ft)
0.046
N/A
N/A
N/A
N/A
Velocity, V (ft/s)
5.35
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
0.81
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
0.81
TOTAL Tc (min)
20

NRCS TRAVEL TIME CALCULATIONS
DATE: 2/19/2024
Flow Length (ft)
31
PROJECT: Sennebogen
Upstream Elev (ft)
777
PROJECT M 8189.0823CD
Downstream Elev (ft)
775.6
DESIGNER: SMC
Mannings n
0.400
CATCHMENT: Pre-Dev to BMP
Slope (ft/ft)
0.045
P2 (in)
3.12
Travel Time, Tt (min)
TYPE
SHALLOW CONCENTRATED
SECTION
2
3
4
5
Flow Length (ft)
178.8
78.3
Upstream Elev (ft)
775.6
772.6
Downstream Elev (ft)
772.6
752.3
Surface Type
Paved
Unpaved
N/A
N/A
N/A
Slope (ft/ft)
0.017
0.259
N/A
N/A
N/A
V (ft/s)
2.63
8.22
N/A
N/A
N/A
Travel Time, Tt (min)
1.13
0.16
N/A
N/A
N/A
Travel Time, Tt (min)
1.29
TYPE
OPEN CHANNEL
SECTION
1
2
3
Channel Type
Triangular
N/A
N/A
N/A
N/A
Width, b (ft)
Flow Depth, h (ft)
1
Top Width, T (ft)
Side Slope, z
2
Pipe Dia., D (ft)
Area (ft2)
2.00
N/A
N/A
N/A
N/A
Wetted Perimeter (ft)
4.47
N/A
N/A
N/A
N/A
Hydraulic Radius (ft)
0.45
N/A
N/A
N/A
N/A
Flow Length (ft)
37.9
Upstream Elev (ft)
752.3
Downstream Elev (ft)
748
Mannings n
0.035
Slope (ft/ft)
0.113
N/A
N/A
N/A
N/A
Velocity, V (ft/s)
8.39
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
0.08
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
TOTAL Tc (min)

NRCS TRAVEL TIME CALCULATIONS
DATE: 2/19/2024
Flow Length (ft)
45
PROJECT: Sennebogen
Upstream Elev (ft)
767.8
PROJECT M 8189.0823CD
Downstream Elev (ft)
755
DESIGNER: SMC
Mannings n
0.400
CATCHMENT: Post-Dev to BMP
Slope (ft/ft)
0.284
P2 (in)
3.12
Travel Time, Tt (min)
TYPE
SHALLOW CONCENTRATED
SECTION
2
3
4
Flow Length (ft)
202
Upstream Elev (ft)
755
Downstream Elev (ft)
752.3
Surface Type
Paved
N/A
N/A
N/A
N/A
Slope (ft/ft)
0.013
N/A
N/A
N/A
N/A
V (ft/s)
2.35
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
1.44
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
1.44
TYPE
OPEN CHANNEL
SECTION
1
2
3
Channel Type
Circular
N/A
N/A
N/A
N/A
Width, b (ft)
Flow Depth, h (ft)
Top Width, T (ft)
Side Slope, z
Pipe Dia., D (ft)
15
Area (ft2)
176.71
N/A
N/A
N/A
N/A
Wetted Perimeter (ft)
47.12
N/A
N/A
N/A
N/A
Hydraulic Radius (ft)
3.75
N/A
N/A
N/A
N/A
Flow Length (ft)
441
Upstream Elev (ft)
746.8
Downstream Elev (ft)
742
Mannings n
0.013
Slope (ft/ft)
0.011
N/A
N/A
N/A
N/A
Velocity, V (ft/s)
28.86
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
0.26
N/A
N/A
N/A
N/A
Travel Time, Tt (min)
0.26
TOTAL Tc (min)
6

Sand Filter Design
DATE: 2/19/2024
PROJECT: Sennebogen
PROJECT #: 8189.0823CD
DESIGNER: SMC
Post Development DA 1A
1 SITE DATA
Pre-Dev
Post-Dev
Area to Sand Filter (sf)
330,991
385,907
Area to Sand Filter (ac)
7.60
8.86
Impervious (sf)
77,146
223,565
Impervious (ac)
1.77
5.13
Pervious (ac)
5.83
3.73
% Impervious
23%
58%
2 WATER QUALITY CALCULATIONS
Runoff Coefficient, Rv
0.57
R = 0.05 + 0.009 = I
WQv (ac-ft)
0.422
1.0 * R * A
WQv (in)
0.57
WQU =
12
WQv (cf)
18,375
75% WQv (cf)
13,781
hmax filter(ft)
6.00
h_, (ft)
3.00
Min. Surface Area (ft)
2,297
75% WQv / hmax filter
3 HYDROLOGIC PARAMETERS
Pre-Dev
Post-Dev
Area (sf)
330,991
385,907
Area (ac)
7.60
8.86
CN
71
85
CN, (modified, P=1 in)
95
95
Travel Time T, (min)
20
6
1000
CN,,, _
[10+5P+10WQ -10(WQ 2+1.25WQ P)
NCDEQ Stormwater Design Manual
Chapter 11 - Sand Filter (Rev September 20, 2009)
Target Sand Filter Effectiveness
Detention Time (days)* 2
Media Depth 1.5 ft
Removal Rate 85% TSS
*measured from the midpoint of the design storm
CURVE NUMBER CALCULATION
Pre -Development
Area
HSG
CN
CN*Area
Impervious
1.77
B
98
173.56
Open Space
0.47
B
61
28.67
Woods
3.56
B
55
195.80
Woods
1.8
D
77
138.60
536.63
Sum
71
CN Weighted
Post -Development
Area
HSG
CN
CN*Area
Impervious
5.13
Band D
98
502.97
Open Space
3.00
B
61
183.00
Open Space
0.83
D
80
66.40
752.37
Sum
85
CN Weighted
4 WATER QUALITY PEAK FLOW
WQp (cfs) 8.84 *From HydroCAD Node 7S (Post Dev (Modified CN))
S CHANNEL PROTECTION VOLUME
Post-Dev 1000
S (in) 1.78 S =
P (in, 1-yr, 24-hr)) 2.58 CN-10(2.58 - 0.25)�
Qd (in) 1.24 Qd = (P + 0.85)
CPv (ac-ft) 0.91 Qd * A
CP = 12
B RELEASE RATES
Drawdown Time (hr)
Water Quality 40
Channel Protection N/A
Post-Dev (43,560 * WQ )
WQ, Release (cfs) 0.128 WQ, Release Rate - (DrawdownTime * 3,600)
CPv Release (cfs) #DIV/0! (43,560 * CP )
CP Release Rate =
(DrawdownTime * 3,600)

Sand Filter Design
7
SEDIMENTATION AND FILTRATION CHAMBERS
SEDIMENTATION
As (ft2)
1214.9
240 * Rv * DA *
Rd
FILTRATION
Filter Bed Depth, df (ft)
1.5
Permeability, k (ft(day)
3.5
Avg height of water, IN (ft)
1.000
Filter Drain Time, 6 (days)
1.667
Filter Surface Area, Af (ft)
A W Q, * df
f
k * (h, + df) * tf
Length -to -Width Ratio
2
Length (ft)
53.2
Width (ft)
26.6
H
STAGE -STORAGE
Volume (ac-ft)
Stage (ft) Area (fe)
Area (ac) Avg Area (ac)
Increm. Cumulative
739.00 6,694
0.1537
0.0000
0.0000 0.0000
740.00 7,790
0.1788
0.1663
0.1663 0.1663
741.00 8,942
0.2053
0.1921
0.1921 0.3583
742.00 10,152
0.2331
0.2192
0.2192 0.5775
743.00 11,417
0.2621
0.2476
0.2476 0.8251
744.00 12,740
0.2925
0.2773
0.2773 1.1023
745.00 14,118
0.3241
0.3083
0.3083 1.4106
746.00 15,554
0.3571
0.3406
0.3406 1.7512
J
STAGE -DISCHARGE
Top of Filter Media
739
Stage Height
Discharge (cfs)
739.00 0
0.000
740.00 1
0.096
741.00 2
0.134
742.00 3
0.172
743.00 4
0.211
744.00 5
0.249
745.00 6
0.287
746.00 7
0.325
10
WATER QUALITY AND CHANNEL PROTECTION ELEVATIONS
WATER QUALITY ELEVATION
CHANNEL PROTECTION ELEVATION
Stage Storage (ac-ft)
Stage
Storage (ac-ft)
740 0.1663
#N/A
0.7 748_ ' 0.3164
------ :
_ _ _ _ _
r #N/A
L-----------
0.9137
---
0.3583
#N/A
11 DRAWDOWN AND UNDERDRAIN DESIGN
Minimum Drawdown Discharge
WQ' (ft)
13,781
Drawdown (cfs)
0.128
Compute Perforation Capacity
Compute Underdrain Capacity
No. of pipes
4
Underdrain Slope (ft/ft)
0.01
Length of each pipe (ft)
44
Underdrain Size (in)
6
Number of cleanouts per pipe
2
Underdrain A (fe)
0.196
Rows per foot
4
Underdrain P (ft)
1.571
Holes per Row
4
Underdrain Capacity (cfs)
0.56
Number of perforations
2688
Unclogged Capacity (cfs)
0.28
Percent clogged
50%
*Needs to be greater than 1' depth
Unclogged Perforations
1344
discharge and min. drawdown capacity
Storage Depth (ft)
2
Perforation Capacity (cfs)
0.0052
Total Capacity (cfs)
7.0194

Sand Filter Design
DATE: 2/19/2024
PROJECT: Sennebogen
PROJECT #: 8189.0823CD
DESIGNER: SMC
Post Development DA 1 B
I SITE DATA
Pre-Dev
Post-Dev
Area to Sand Filter (sf)
11,678
Area to Sand Filter (ac)
0.00
0.27
Impervious (sf)
0
Impervious (ac)
0.00
0.00
Pervious (ac)
0.00
0.27
% Impervious
#DIV/0!
0%
2 HYDROLOGIC PARAMETERS
Pre-Dev
Post-Dev
Area (sf)
0
11,678
Area (ac)
0.00
0.27
CN
#DIV/0!
80
CN, (modified, P=1 in)
#REF!
#REF!
Travel Time T, (min)
5
1000
CN,,, _
[10+5P+10WQ —10(WQ 2+1.25WQ P)os]
NCDEQ Stormwater Design Manual
Chapter 11 - Sand Filter (Rev September 20, 2009)
Target Sand Filter Effectiveness
Detention Time (days)* 2
Media Depth 1.5 ft
Removal Rate 85% TSS
*measured from the midpoint of the design storm
CURVE NUMBER CALCULATION
Pre -Development
Area HSG CN
CN*Area
0.00
0.00
0.00
0.00
0.00
Sum
#DIV/0!
CN Weighted
Post -Development
Area HSG CN
CN*Area
Open Space 0.27 D 80
21.45
0.00
0.00
21.45
Sum
80
CN Weighted

Sand Filter Design
DATE: 2/19/2024
PROJECT: Sennebogen
PROJECT #: 8189.0823CD
DESIGNER: SMC
Post Development DA 2
I SITE DATA
Pre-Dev
Post-Dev
Area to Sand Filter (sf)
58,307
19,316
Area to Sand Filter (ac)
1.34
0.44
Impervious (sf)
23,324
11,497
Impervious (ac)
0.54
0.26
Pervious (ac)
0.80
0.18
% Impervious
40%
60%
2 HYDROLOGIC PARAMETERS
Pre-Dev
Post-Dev
Area (sf)
58,307
19,316
Area (ac)
1.34
0.44
CN
72
83
CN, (modified, P=1 in)
#REF!
#REF!
Travel Time T, (min)
8
5
1000
CN,,, _
[10+5P+10WQ —10(WQ 2+1.25WQ P)os]
NCDEQ Stormwater Design Manual
Chapter 11 - Sand Filter (Rev September 20, 2009)
Target Sand Filter Effectiveness
Detention Time (days)* 2
Media Depth 1.5 ft
Removal Rate 85% TSS
*measured from the midpoint of the design storm
CURVE NUMBER CALCULATION
Pre -Development
Area
HSG
CN
CN*Area
Impervious
0.54
B
98
52.47
Open Space
B
61
0.00
Woods
0.80
B
55
44.17
0.00
96.64
Sum
72
CN Weighted
Post -Development
Area
HSG
CN
CN*Area
Impervious
0.26
B
98
25.87
Open Space
0.18
B
61
10.95
0.00
36.82
Sum
83
CN Weighted

CES Group Engineers, LLP
274 N. Highway 16
Denver, NC 28037
Sennebogen
Project Number:
8189
Original Date:
2/19/24
DB:
SC
Revision Date:
PM:
JM
Standard Data
Standard Footing Assumptions
Buoyant Weight of Concrete 87.6 Ibs/ft^3
Footing depth to be a minimum of 8 inches in depth.
Weight of Water i 62.4 Ibs/ft^3
Safety Factor (S.F.) 1 1.501
Outlet Structure - Dry Pond
Structure Dimensions
Object Weights
Height of structure, h =
7.25 ft.
Outlet Structure Weight, W(s) =1 6986111bs
Structure wall thickness, t =
6 in.
Displaced Water Weight, W(w) = 10857.E Ibs
Outlet box inside dimension, w =
5 Ift.
Req'd Base Weight, W(b) =1 9300 Ibs
Footing Size
Required Footing Volume, V(f) =
106 cf
Standard Footing Length, L = 7.00 ft.
Provided Footing Volume V =
128 cf
Standard Footing Width W = 7.00 ft.
Footing Checkl
oka I
Minimum FootingDe th D =1 1.001ft.
Footing Size to be used:
(Length =
(Width =
IDepth =
8.00 ft.
8.00 ft.
2.00 ft.
Outlet Structure - Dry Pond
Equations used:
Outlet Structure Weight, W(s) = 4(w + t) x t x h x W(bc) 1
1 where, w = outlet box inside dimension, ft.
Displaced Water Weight, W(w) = 4 x (w + 2t) x W(w) x h t = structure wall thickness, ft.
h = height of structure, ft.
Required Base Weight, W(b) = (W(w) x S.F.) - W(s) I W(bc)= buoyant weight of concrete, Ibs/ft^3
W(w)= weight of water, Ibs/ft^3
Required Footing Volume, V(f) = W(b) / W(bc) S.F.= safety factor

Drainage Area 1 Drainage Area 2
Ois
8S
Pre-Dev 1
Pre-Dev 2
5S 6P
Post Dev 1A Sand Filter 13S
Post-Dev 2
11S � 12L
Post Dev 1 B Analysis Point 1
7S
Post Dev (Modified CN)
Subcat Reach on Link Routing Diagram for8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP, Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 2
Rainfall Events Listing
Event# Event Storm Type Curve Mode Duration B/B Depth AMC
Name (hours) (inches)
1 1-inch
Type II 24-hr
Default
24.00
1
1.00 2
2 1-yr
Type II 24-hr
Default
24.00
1
2.78 2
3 2-yr
Type II 24-hr
Default
24.00
1
3.36 2
4 10-yr
Type II 24-hr
Default
24.00
1
4.91 2
5 25-yr
Type II 24-hr
Default
24.00
1
5.83 2
6 50-yr
Type II 24-hr
Default
24.00
1
6.57 2
7 100-yr
Type II 24-hr
Default
24.00
1
7.32 2

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Page 3
Area Listing (all nodes)
Area CN Description
(acres) (subcatchment-numbers)
7.600 71 (is)
8.860 85 (5S)
8.860 95 (7S)
1.340 72 (8S)
0.270 80 (11 S)
0.440 83 (13S)
27.370 84 TOTAL AREA

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Page 4
Soil Listing (all nodes)
Area Soil Subcatchment
(acres) Group Numbers
0.000 HSG A
0.000 HSG B
0.000 HSG C
0.000 HSG D
27.370 Other 1 S, 5S, 7S, 8S, 11 S, 13S
27.370 TOTAL AREA

8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC
Sennebogen - Sand Filter Design
Printed 3/8/2024
Page 5
Ground Covers (all nodes)
HSG-A HSG-B HSG-C HSG-D Other Total
Ground Subcatchment
(acres) (acres) (acres) (acres) (acres) (acres)
Cover Numbers
0.000 0.000 0.000 0.000 27.370 27.370
1 S, 5S, 7S, 8S,
11S, 13S
0.000 0.000 0.000 0.000 27.370 27.370
TOTAL AREA

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 6
Pipe Listing (all nodes)
Line# Node In -Invert Out -Invert Length Slope n Width Diam/Height Inside -Fill Node
Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) Name
1 6P 737.00 736.30 70.4 0.0099 0.013 0.0 30.0 0.0

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 7
Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 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-Dev 1 Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=0.01"
Tc=20.0 min CN=71 Runoff=0.01 cfs 0.005 of
Subcatchment5S: Post Dev 1A Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=0.17"
Tc=6.0 min CN=85 Runoff=2.41 cfs 0.128 of
Subcatchment7S: Post Dev (Modified CN) Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=0.56"
Tc=6.0 min CN=95 Runoff=8.84 cfs 0.416 of
Subcatchment8S: Pre-Dev2 Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=0.01"
Tc=8.0 min CN=72 Runoff=0.00 cfs 0.001 of
Subcatchment11S: Post Dev 1B Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=0.08"
Tc=5.0 min CN=80 Runoff=0.02 cfs 0.002 of
Subcatchment13S: Post-Dev2 Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=0.13"
Tc=5.0 min CN=83 Runoff=0.08 cfs 0.005 of
Pond 6P: Sand Filter Peak Elev=739.52' Storage=0.083 of Inflow=2.41 cfs 0.128 of
Primary=0.05 cfs 0.128 of Secondary=0.00 cfs 0.000 of Outflow=0.05 cfs 0.128 of
Link 12L: Analysis Point 1 Inflow=0.05 cfs 0.130 of
Primary=0.05 cfs 0.130 of
Total Runoff Area = 27.370 ac Runoff Volume = 0.557 of Average Runoff Depth = 0.24"
100.00% Pervious = 27.370 ac 0.00% Impervious = 0.000 ac

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 8
Summary for Subcatchment 1S: Pre-Dev 1
Runoff = 0.01 cfs @ 24.02 hrs, Volume= 0.005 af, Depth= 0.01"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
7.600 71
7.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.0 Direct Entry,
Subcatchment 1S: Pre-Dev 1
Hydrograph
---r-- -- ---- - - - - --
- - _' - - - ■Runoff
0.007
0.007 --- --I- -- - - - - - - T---;--------I---- Type- If2-4=lhx -
0.006
-- - --- -------;---;-----1-Iin-ch-Rainfall:4,00"-
0.006 I I I I I
0.005 RUnoff Atea=7.600 �ic
0.005 -- ---- I PvpnOf-1�-01 me;-_
0. 05-,a�f -
----------------------
" 0.004 ---- ----- r---t----------RLmo#f Dept&O01"-
w
--------------------------------------
0.003 Tc=�20.0 min
--- -y--- t-
--y------------r---t-------I----I----
0.003 --- -------'i--- --- ---
0.002
0.002
0.001
0.001
0.000
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 9
Summary for Subcatchment 5S: Post Dev 1A
Runoff = 2.41 cfs @ 11.99 hrs, Volume= 0.128 af, Depth= 0.17"
Routed to Pond 6P : Sand Filter
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
8.860 85
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
N
3
0
LL
2
M
0L
0
Subcatchment 5S: Post Dev 1A
Hydrograph
Type II 24,,hr
T---T-- t-incrh-Rainfall=1.00"-
Runoff Area=8.860 ac
Runoff Volume=0.128 of
Runoff Depth=0.17"
Tc=6.0 min
CAN=$5
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 10
Summary for Subcatchment 7S: Post Dev (Modified CN)
Runoff = 8.84 cfs @ 11.97 hrs, Volume= 0.416 af, Depth= 0.56"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
8.860 95
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 7S: Post Dev (Modified CN)
Hydrograph
--
' ' ■Runoff
9 8.84 cfs
1---J---- L----TYpe II'II.24�hr_
1 rinc�Ih RainfallT1.010"
Runoff A''rea�8.860 ac
6 Runoff 1 ofurne�=�.- 1 �;af-
I I I
------------ ftrtoff-De pthT0:56
5
LL -- ----- --r--- - Td=6-.0 rftrn-
3
--
1
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 11
Summary for Subcatchment 8S: Pre-Dev 2
Runoff = 0.00 cfs @ 17.75 hrs, Volume= 0.001 af, Depth= 0.01"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
1.340 72
1.340 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
8.0 Direct Entry,
Subcatchment 8S: Pre-Dev 2
Hydrograph
---r---T-
---------- ----+--------i----
0.002
--- r - - -
+- ------------------+---+----�----�----
■Runoff
0.002
O.00cfs
+-------i----
+-- - - - - -----------+---+-��-//-
0.002
+
--------+---L--------L---L---1pe 1( hir
0.002
0.001
---' -
----------------- __1-�innk_Rainfal1--;1_00"_
0.001
---
- ---; --- -------- -RdnofA�'ea-tl.34-0 Ac -
0.001
-
-L---L---L-----------'----L---L-----------'----
0.001
---
-------- --- --- --- --
', R-pnpff-V�ola;mOO.001-''0 -
w0.001
w
0.001
---
---
-J----1----L---L---L---L----1----1----L---1---L----1----1----
-J--------'L---L---i-----------Runoff-pe#h�0.0'I"_
3LL 0.0010
t
I I I I --I ----I --------LTq=8i-min--
0.001
i
---
------'------------------------'
0.001
--- -
/�l
---------- ----------- --------N=72_-
0.001
0.000
0.000
--- --
--'--
0.000
0.000
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 12
Summary for Subcatchment 11S: Post Dev 1 B
Runoff = 0.02 cfs @ 12.00 hrs, Volume= 0.002 af, Depth= 0.08"
Routed to Link 12L : Analysis Point 1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
0.270 80
0.270 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 11S: Post Dev 1B
Hydrograph
0.025
1---r---7-------
-- - -r--- --- -�r- ---- -----------
■Runoff
0.024
0.023
0.022
'
---
--- --- -- ---- --------- --- ---------------
------ - -
-- -------- -r- ---
------------ ----L—L --- -Type -W24-1h--r--
-
0.02cfs
--
0.02
--
------ - - - - ------ 1 1 --- ---- -- 4n-cih-Rainfell-1-. 0"-
0.019
0.018
--
--
------- - - - - ------- r--- +--------'--------�r--/�-+-----------i----
------------------' ----'-------- -RU1�V1�1 Atea=*.270-la
0.017
--
--------- - - - - -- ------+--- ------------I---+---I----I----I----
0.016
� j
--
---------------�---- --- --- -- �k e�
ff
0.015
--
---------------------+-----Ro_VL�1UIeO.OL_��_
w 0.014
= 0.013
--
--
------------------------------��-- p }
----------------------L----------Runoff_Depfii. -08 -
3 0.012
a0.011
--
-------- ------ - ---------- - - - - -, ---, - -,_---
--
-------------- L---------------L---L— _C=S.V-�n-
0.009
�i
--
----------------- ------------ L--- L--�N4Q-
0.008
--
--- - - - - -------r-- --T---T------------
0.007
j
-
-------- ------------'----
0.006
-
- - - - - - - -
0.005
-
------
0.004
-
0.003
-
0.002
-
0.001
0
0
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 13
Summary for Subcatchment 13S: Post-Dev 2
Runoff = 0.08 cfs @ 11.98 hrs, Volume= 0.005 af, Depth= 0.13"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
0.440 83
0.440 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0.095
0.09
---'_---_-
0.08 cfs
0.085
0.08
_________
0.075
- - - - - - - - -
0.07-
0.065
0.06
--
--- - - - - --
w 0.055
__
--_------
0.05
0 0.045
--
- - - - -- --
EL: 0.04
0.035
--
- - - - - - - - -
0.03
0.025
0.02
0.015
0.01
/
0.005
Subcatchment 13S: Post-Dev 2
Hydrograph
------ I I -
t--- I ----I---- ■Runoff
-
----I————t---t---t---I————
I----
-——————- t----t--- t---type W24-'Ihr -
-—————--T---------------r---t------------I----
--------+-------- 14n_ck_Raflnfal1--;1_00"-
--- --- --- -Runoff Atea.-;II.44-0-Ac -
— — — — L — — — t — — — — — — —I— — — —I— — — — — — — + — — — — — — —I— — — —I— — — -
- - - - - - - R-01 n ff-VoI me=0.00 &''0 -
--- i--- Run off-pepth.-;0.13"-
-- ---- T7=5.-i-min--
—'i----'i--- I --- ICI ---
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 14
Summary for Pond 6P: Sand Filter
Inflow Area = 8.860 ac, 0.00% Impervious, Inflow Depth = 0.17" for 1-inch event
Inflow = 2.41 cfs @ 11.99 hrs, Volume= 0.128 of
Outflow = 0.05 cfs @ 21.30 hrs, Volume= 0.128 af, Atten= 98%, Lag= 558.6 min
Primary = 0.05 cfs @ 21.30 hrs, Volume= 0.128 of
Routed to Link 12L : Analysis Point 1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routed to nonexistent node 7L
Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Peak Elev= 739.52' @ 21.30 hrs Surf.Area= 0.167 ac Storage= 0.083 of
Plug -Flow detention time= 1,191.7 min calculated for 0.128 of (100% of inflow)
Center -of -Mass det. time= 1,191.8 min (2,089.9 - 898.1 )
Volume Invert Avail.Storage
Storage Description
#1 739.00'
1.751
of Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet) (acres)
(acre-feet) (acre-feet)
739.00
0.154
0.000 0.000
740.00
0.179
0.166 0.166
741.00
0.205
0.192 0.358
742.00
0.233
0.219 0.578
743.00
0.262
0.247 0.825
744.00
0.293
0.277 1.102
745.00
0.324
0.308 1.411
746.00
0.357
0.340 1.751
Device Routing
Invert
Outlet Devices
#1 Primary
737.00'
30.0" Round Culvert
L= 70.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099'/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1
739.00'
Special & User -Defined
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Disch. (cfs) 0.000 0.096 0.134 0.172 0.211 0.249 0.287 0.325
#3 Device 1
740.80'
24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Device 1
742.25'
24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1
744.25'
4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns
X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area)
Limited to weir flow at low heads
#6 Secondary
744.50'
20.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 15
Primary OutFlow Max=0.05 cfs @ 21.30 hrs HW=739.52' (Free Discharge)
L1=Culvert (Passes 0.05 cfs of 28.19 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.05 cfs)
3=Orifi ce/G rate ( Controls 0.00 cfs)
=Orifi ce/G rate ( Controls 0.00 cfs)
=Orifi ce/G rate ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge)
L6= Broad -Crested Rectangular Weir( Controls 0.00 cfs)
N
U
3
0
LL
Pond 6P: Sand Filter
Hyd rog raph
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
ary

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Paae 16
746
745
744
w
w 743
c
0
.�
w 742
w
741
740
739
0
Pond 6P: Sand Filter
Stage -Discharge
20 40 60 80 100 120 140 160
Discharge (cfs)
Pond 6P: Sand Filter
Stage -Area -Storage
Surface/Horizontal/Wetted Area (acres)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34
0 1
Storage (acre-feet)
❑ Total
■ Primary
■ Secondary
❑ Surface
S Storage

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 11 24-hr 1-inch Rainfall=1.00"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 17
Summary for Link 12L: Analysis Point 1
Inflow Area = 9.130 ac, 0.00% Impervious, Inflow Depth > 0.17" for 1-inch event
Inflow = 0.05 cfs @ 21.04 hrs, Volume= 0.130 of
Primary = 0.05 cfs @ 21.04 hrs, Volume= 0.130 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
0
0
0
N
U
3
LL 0
0
0
Link 12L: Analysis Point 1
Hyd rog raph
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Inflow
■ Primary

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 18
Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 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-Dev 1 Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=0.64"
Tc=20.0 min CN=71 Runoff=4.65 cfs 0.404 of
Subcatchment5S: Post Dev 1A Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=1.41"
Tc=6.0 min CN=85 Runoff=22.23 cfs 1.038 of
Subcatchment7S: Post Dev (Modified CN) Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=2.23"
Tc=6.0 min CN=95 Runoff=32.53 cfs 1.650 of
Subcatchment8S: Pre-Dev 2 Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=0.68"
Tc=8.0 min CN=72 Runoff=1.43 cfs 0.076 of
Subcatchment11S: Post Dev 1B Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=1.09"
Tc=5.0 min CN=80 Runoff=0.55 cfs 0.024 of
Subcatchment13S: Post-Dev2 Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=1.27"
Tc=5.0 min CN=83 Runoff=1.04 cfs 0.047 of
Pond 6P: Sand Filter Peak Elev=741.53' Storage=0.470 of Inflow=22.23 cfs 1.038 of
Primary=4.04 cfs 1.037 of Secondary=0.00 cfs 0.000 of Outflow=4.04 cfs 1.037 of
Link 12L: Analysis Point 1 Inflow=4.13 cfs 1.062 of
Primary=4.13 cfs 1.062 of
Total Runoff Area = 27.370 ac Runoff Volume = 3.238 of Average Runoff Depth = 1.42"
100.00% Pervious = 27.370 ac 0.00% Impervious = 0.000 ac

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 19
Summary for Subcatchment 1S: Pre-Dev 1
Runoff = 4.65 cfs @ 12.15 hrs, Volume= 0.404 af, Depth= 0.64"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-yr Rainfall=2.78"
Area (ac) CN Description
7.600 71
7.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.0 Direct Entry,
5
4
H 3
3
0
LL
2
0L
0
Subcatchment 1S: Pre-Dev 1
Hydrograph
Type II 24,,hr
------1=yr-RainfaH=2-.78"-
Runoff Area: 7.600 Oc
- - - - - - - - Aunoff Vol u me=0.404 of -
Runoff Depth=0.64"
Tc=20.0 i n
- - - - - - - - - - - - - - - - - - - - - - - T - - - -
ON41
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 20
Summary for Subcatchment 5S: Post Dev 1A
Runoff = 22.23 cfs @ 11.97 hrs, Volume= 1.038 af, Depth= 1.41"
Routed to Pond 6P : Sand Filter
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-yr Rainfall=2.78"
Area (ac) CN Description
8.860 85
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 5S: Post Dev 1A
Hydrograph
24---T----- - - ----- - -T- -- -- ------ I — — — — �F- - -T - -- I - - --
■Runoff
23 22.23 cfs————— — — — — ——— ---L—— ----L---L----1----L---1---L----
22 -------------------r------ r--- I ----'� e-Fh 24 Kr-
21 -- ------------- ----I--- -----'-----'----
20 ------------ - - - --- ---- ----------- -1- rRainfal[:; .��Iv��-
------------------ ------ ---- yy,, 1817 ,------------------- ----i----Rwnoff-Area=8.I Ac-
;5 r- ---- nQf- olµme'1-��8-a -
------------------ ---- --
------------------13 - ---- RLmaff
GG
U
3 12 _ -------c----------
FL11 --------------- ------------- ------------
10 ---------------------------------- ---�-N --- -
8 ------- - - - - ---------- - - ----------T -- "T--;----
7 -- ------ L----'-------1----1----
6 -- ----- ---- --------------
5 -- --- -
4 -- -
F
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 21
Summary for Subcatchment 7S: Post Dev (Modified CN)
Runoff = 32.53 cfs @ 11.97 hrs, Volume= 1.650 af, Depth= 2.23"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-yr Rainfall=2.78"
Area (ac) CN Description
8.860 95
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 7S: Post Dev (Modified CN)
Hydrograph
---1----1------------- - ----1--------
36 ----'----'--------------------------'----'---- ■Runoff
34 32.53 cfs
32 ---------------------------- ----Type-IfL4,hr -
30
28 ------------- --- ------------ 1-ITF�ainfalrT2.7,8�F_
-r--------r-p-r--w;� p pc^ y-
26 ------------------r-------- --FF�I nGff-/'- rea�8.-86OA1 c -
24 - --- --- ---- - --
22 -----L -1-F=unQf=olme'L 1:30='Iaf=
20--------------- --- --- -----Flanof# Depth:;2.23---
FL:
16 -- ------------- -------- --------I' --- ----I''--Td=6'0_Min=-
-- - - - -- -r- - - -- -T- -
14 -- ------ ---- -----------r--CAN=-$S
12 -- ---- --- --------------+----1----
8-
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 22
Summary for Subcatchment 8S: Pre-Dev 2
Runoff = 1.43 cfs @ 12.01 hrs, Volume= 0.076 af, Depth= 0.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-yr Rainfall=2.78"
Area (ac) CN Description
1.340 72
1.340 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
8.0 Direct Entry,
Subcatchment 8S: Pre-Dev 2
Hydrograph
Type II 24,,hr
1-yr Rainfall=2.78"
Runoff Area=1.340 �ac
Runoff Volume=0.076 of
Runoff Depth=0.68"
Tc=8.0 min
CN=72
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 23
Summary for Subcatchment 11S: Post Dev 1 B
Runoff = 0.55 cfs @ 11.97 hrs, Volume= 0.024 af, Depth= 1.09"
Routed to Link 12L : Analysis Point 1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-yr Rainfall=2.78"
Area (ac) CN Description
0.270 80
0.270 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0.6
CO]
.55
0.5
.45
w 0.35 '
0.3
0
LL
0.25
0.2
0.15
0.1
0.05
Subcatchment 11S: Post Dev 1B
Hydrograph
-T--- -----T----I---- I---- T --- T--- T---
----r---rt---- TyReA2_4yhr_
{---- ------ 1-YrRl flnfal[;;2 7_8
---1------------L-ftnoff-Aiv&0.27Q,6c-
-u f qff V% [gxne-0:02--IIIa#
--------- r--- r----
- - - - - - - - - - - - - -I-
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 24
Summary for Subcatchment 13S: Post-Dev 2
Runoff = 1.04 cfs @ 11.96 hrs, Volume= 0.047 af, Depth= 1.27"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 1-yr Rainfall=2.78"
Area (ac) CN Description
0.440 83
0.440 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
3
0
LL
7
0L
0
Subcatchment 13S: Post-Dev 2
Hydrograph
TYpe It 24,�r
1-yr Rainfall=2.78"
Runoff Area=0.440 ac
Runoff Volume=0.047'O
Runoff Depth=1.27"
Tc=5.0 min
CN=83
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 25
Summary for Pond 6P: Sand Filter
Inflow Area = 8.860 ac, 0.00% Impervious, Inflow Depth = 1.41" for 1-yr event
Inflow = 22.23 cfs @ 11.97 hrs, Volume= 1.038 of
Outflow = 4.04 cfs @ 12.16 hrs, Volume= 1.037 af, Atten= 82%, Lag= 11.0 min
Primary = 4.04 cfs @ 12.16 hrs, Volume= 1.037 of
Routed to Link 12L : Analysis Point 1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routed to nonexistent node 7L
Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Peak Elev= 741.53' @ 12.16 hrs Surf.Area= 0.220 ac Storage= 0.470 of
Plug -Flow detention time= 689.5 min calculated for 1.037 of (100% of inflow)
Center -of -Mass det. time= 689.2 min ( 1,518.6 - 829.4 )
Volume Invert Avail.Storage
Storage Description
#1 739.00'
1.751
of Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet) (acres)
(acre-feet) (acre-feet)
739.00
0.154
0.000 0.000
740.00
0.179
0.166 0.166
741.00
0.205
0.192 0.358
742.00
0.233
0.219 0.578
743.00
0.262
0.247 0.825
744.00
0.293
0.277 1.102
745.00
0.324
0.308 1.411
746.00
0.357
0.340 1.751
Device Routing
Invert
Outlet Devices
#1 Primary
737.00'
30.0" Round Culvert
L= 70.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099'/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1
739.00'
Special & User -Defined
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Disch. (cfs) 0.000 0.096 0.134 0.172 0.211 0.249 0.287 0.325
#3 Device 1
740.80'
24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Device 1
742.25'
24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1
744.25'
4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns
X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area)
Limited to weir flow at low heads
#6 Secondary
744.50'
20.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 26
Primary OutFlow Max=4.04 cfs @ 12.16 hrs HW=741.53' (Free Discharge)
L1=Culvert (Passes 4.04 cfs of 47.80 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.15 cfs)
3=Orifi ce/G rate (Orifice Controls 3.88 cfs @ 2.91 fps)
=Orifi ce/G rate ( Controls 0.00 cfs)
=Orifi ce/G rate ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge)
L6= Broad -Crested Rectangular Weir( Controls 0.00 cfs)
N
U
3
0
LL
Pond 6P: Sand Filter
Hyd rog raph
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
a
ry

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Paae 27
746
745
744
w
w 743
c
0
.�
w 742
w
741
740
739
0
Pond 6P: Sand Filter
Stage -Discharge
20 40 60 80 100 120 140 160
Discharge (cfs)
Pond 6P: Sand Filter
Stage -Area -Storage
Surface/Horizontal/Wetted Area (acres)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34
0 1
Storage (acre-feet)
❑ Total
■ Primary
■ Secondary
❑ Surface
S Storage

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 1-yrRainfall=2.78"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 28
Summary for Link 12L: Analysis Point 1
Inflow Area = 9.130 ac, 0.00% Impervious, Inflow Depth = 1.40" for 1-yr event
Inflow = 4.13 cfs @ 12.15 hrs, Volume= 1.062 of
Primary = 4.13 cfs @ 12.15 hrs, Volume= 1.062 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Link 12L: Analysis Point 1
Hyd rog raph
■ Inflow
■ Primary
4
3
N
U
3
0
LL 2
1
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 29
Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 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-Dev 1 Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=0.98"
Tc=20.0 min CN=71 Runoff=7.64 cfs 0.618 of
Subcatchment5S: Post Dev 1A Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=1.89"
Tc=6.0 min CN=85 Runoff=29.74 cfs 1.399 of
Subcatchment7S: Post Dev (Modified CN) Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=2.80"
Tc=6.0 min CN=95 Runoff=40.17 cfs 2.069 of
Subcatchment8S: Pre-Dev 2 Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=1.03"
Tc=8.0 min CN=72 Runoff=2.24 cfs 0.115 of
Subcatchment11S: Post Dev 1B Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=1.53"
Tc=5.0 min CN=80 Runoff=0.77 cfs 0.034 of
Subcatchment13S: Post-Dev2 Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=1.74"
Tc=5.0 min CN=83 Runoff=1.42 cfs 0.064 of
Pond 6P: Sand Filter Peak Elev=742.19' Storage=0.623 of Inflow=29.74 cfs 1.399 of
Primary=6.76 cfs 1.399 of Secondary=0.00 cfs 0.000 of Outflow=6.76 cfs 1.399 of
Link 12L: Analysis Point 1 Inflow=6.91 cfs 1.433 of
Primary=6.91 cfs 1.433 of
Total Runoff Area = 27.370 ac Runoff Volume = 4.299 of Average Runoff Depth = 1.88"
100.00% Pervious = 27.370 ac 0.00% Impervious = 0.000 ac

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Page 30
Summary for Subcatchment 1S: Pre-Dev 1
Runoff = 7.64 cfs @ 12.15 hrs, Volume= 0.618 af, Depth= 0.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 2-yr Rainfall=3.36"
Area (ac) CN Description
7.600 71
7.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.0 Direct Entry,
Subcatchment 1S: Pre-Dev 1
Hydrograph
------------L---- '---- '----L --- ■Runoff
8 I 7.64 cfs
------- r----r r---- Type 11,24,,hr-
2-yr R�ainfallT3.36"
6 I -----' -------'-RunoffArea=7.600 ac
--- r--- --------+-- un/'I�ff o m,6 0.61&af-
5 Y
Runoffp De thTO-96 LL 4 I-----------------------;----,----,----,I---'TcT20.',0 Min
3
2
1
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 31
Summary for Subcatchment 5S: Post Dev 1A
Runoff = 29.74 cfs @ 11.97 hrs, Volume= 1.399 af, Depth= 1.89"
Routed to Pond 6P : Sand Filter
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 2-yr Rainfall=3.36"
Area (ac) CN Description
8.860 85
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 5S: Post Dev 1A
Hydrograph
-----------------L---L- ----L---1----1----
32 ■Runoff
30
29.74 cfs
' ' '
--------------- --- -- --- --- Type-Fl, 244 r -
28 ---------------- ---- L--------1----L---L--------L--- L---- '----
26 2-fir R�ainfallT3.3,6"
--
24 --------------------r----------Runof#-�4''rea�8.$60A -
22 I — — — 1 — — — FL — — — — IIL — I' —
20 unO�f-�o1Ljme; 1:$99-af-
N
18 --------------------r------------ Runof# Deptki:;1_$9"--
3 16
--------------- ---- ---------------------
a 14--��n--
12 -- ---------------------'--N=�65
10 -- --- 1----------i----'----
8
6
4 -- -
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 32
Summary for Subcatchment 7S: Post Dev (Modified CN)
Runoff = 40.17 cfs @ 11.97 hrs, Volume= 2.069 af, Depth= 2.80"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 2-yr Rainfall=3.36"
Area (ac) CN Description
8.860 95
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 7S: Post Dev (Modified CN)
Hydrograph
-----------------------I--------------
44 ----'------------------------------ - - - -
-'----'---- ■Runoff
42 40.17 cfs— — — — — —— ----
40-------------- --- ---- --- --- ----
------- ----r---r----I -
------ --- ale-N7l4,lhr38�-
------------- ---- -----------
34 r - +
2=y-r RaiinfaI� .3,6��
32 ------------- ------- r---r---- Rattof#-Area: $:&M Ae -
2$ -- ----- ------- - - -
--- --- R-unpff-Vrolume'�,=2 069-a# -
w 26 -------------- - - - - -- I----r---r----r---r---r--------r---r----I----
ff
24 -- ------------------------I---- ----- ^ *f ^
-- --------------------1----L---1----'----L---1--------L---1----'----
LL 20----------------------------------I---------I-T&6l,0-nil in- -
18------------------------r - - -r
16 -------------------------------
--------I---------------{��I�J -
,i
8 ----------------------------------------------------------------
4 ---------------------------------------------------------------
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 33
Summary for Subcatchment 8S: Pre-Dev 2
Runoff = 2.24 cfs @ 12.00 hrs, Volume= 0.115 af, Depth= 1.03"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 2-yr Rainfall=3.36"
Area (ac) CN Description
1.340 72
1.340 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
8.0 Direct Entry,
N
3
0
LL
2
M
0L
0
Subcatchment 8S: Pre-Dev 2
Hydrograph
Type II 24-1hr
- -----'I --- T ----
2-yr Rainfall=3.36"
Runoff Area=1.340 ac
Runoff Volume=0.115 of
Runoff Depth=1.03"
---+- Td=8.01 iTtIn-
CN=72
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 34
Summary for Subcatchment 11S: Post Dev 1 B
Runoff = 0.77 cfs @ 11.96 hrs, Volume= 0.034 af, Depth= 1.53"
Routed to Link 12L : Analysis Point 1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 2-yr Rainfall=3.36"
Area (ac) CN Description
0.270 80
0.270 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0.85
0.8 oT
0.75
0.7
0.65
0.6
0.55
0.5
0.45
o 0.4
LL
0.35
0.3
0.25
0.2
0.15
0.1 I
Subcatchment 11S: Post Dev 1B
Hydrograph
----r--- 6
I----I----7 e_ll�!�4 hr_
-------- ---- II --- `=yr RI�dinfal,TV.V "-
----------'--------
----
----'--- --- Runoff Aeea=0.270 c1c
r - -- T - -- 7------------ r - -- T---- I - - - - I- - - -r - -- T - -- T---
- - - - - - - - ]�,u ngff Vo lutne=0 034.1a#
Rungff Deepth= 1.53
----i---- --' --'
-
--i-- I__
C N-�0
- ----I---- I ----I---
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 35
Summary for Subcatchment 13S: Post-Dev 2
Runoff = 1.42 cfs @ 11.96 hrs, Volume= 0.064 af, Depth= 1.74"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 2-yr Rainfall=3.36"
Area (ac) CN Description
0.440 83
0.440 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0L
0
Subcatchment 13S: Post-Dev 2
Hydrograph
Type II 24,,hr
2-yr Rainfall=3.36"
Runoff Area=0.440 �ac
Runoff Volume=0.064',af
Runoff Depth=1.74"
Tc=5.0 min
CN=83
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 36
Summary for Pond 6P: Sand Filter
Inflow Area = 8.860 ac, 0.00% Impervious, Inflow Depth = 1.89" for 2-yr event
Inflow = 29.74 cfs @ 11.97 hrs, Volume= 1.399 of
Outflow = 6.76 cfs @ 12.12 hrs, Volume= 1.399 af, Atten= 77%, Lag= 9.0 min
Primary = 6.76 cfs @ 12.12 hrs, Volume= 1.399 of
Routed to Link 12L : Analysis Point 1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routed to nonexistent node 7L
Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Peak Elev= 742.19' @ 12.12 hrs Surf.Area= 0.239 ac Storage= 0.623 of
Plug -Flow detention time= 526.0 min calculated for 1.399 of (100% of inflow)
Center -of -Mass det. time= 526.2 min ( 1,347.1 - 820.8 )
Volume Invert Avail.Storage
Storage Description
#1 739.00'
1.751
of Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet) (acres)
(acre-feet) (acre-feet)
739.00
0.154
0.000 0.000
740.00
0.179
0.166 0.166
741.00
0.205
0.192 0.358
742.00
0.233
0.219 0.578
743.00
0.262
0.247 0.825
744.00
0.293
0.277 1.102
745.00
0.324
0.308 1.411
746.00
0.357
0.340 1.751
Device Routing
Invert
Outlet Devices
#1 Primary
737.00'
30.0" Round Culvert
L= 70.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099'/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1
739.00'
Special & User -Defined
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Disch. (cfs) 0.000 0.096 0.134 0.172 0.211 0.249 0.287 0.325
#3 Device 1
740.80'
24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Device 1
742.25'
24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1
744.25'
4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns
X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area)
Limited to weir flow at low heads
#6 Secondary
744.50'
20.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 37
Primary OutFlow Max=6.76 cfs @ 12.12 hrs HW=742.19' (Free Discharge)
L1=Culvert (Passes 6.76 cfs of 53.33 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.18 cfs)
3=Orifi ce/G rate (Orifice Controls 6.58 cfs @ 4.94 fps)
=Orifi ce/G rate ( Controls 0.00 cfs)
=Orifi ce/G rate ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge)
L6= Broad -Crested Rectangular Weir( Controls 0.00 cfs)
Pond 6P: Sand Filter
Hyd rog raph
L --- L-------�--- J ----- - -L-------- - -
' ------1---L---
29.74 cfs
--- -1f1f1oWAre-a=8:86fi 9c--
32 -- --L— ——L-------'------i--Pea
-L-------'------1---L9
---
28 -----1--- L------'--- ---i-- ---- --1 - 1 _L -
26 --L-------------- --- -- Storage=DF623_9 -
24 -------------'---' ---
22 -------- --- --- ---
w20 - --- - ------ --- --- ---
u 18 - ----, ---, ---,---,--- ---, ---, ---i---
---------, ---
3 16 ------------------------------------- ----------
0
a14 - ----------------li------------------li---------i----
12 6.76 cfs — — — — — — — — — — — —, — — --- — — — — — — — — — — — — — —, — — --- — — — — — — — — — — — — — —
10 � 6.76 cfs
8 - — — — — — — — — — — —.— — — — — — — — — — — — — — — — — — —.— — — — — — — — — — — — — — — — — — —
6
4
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
a
ry

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Paae 38
746
745
744
w
w 743
c
0
.�
w 742
w
741
740
739
0
Pond 6P: Sand Filter
Stage -Discharge
20 40 60 80 100 120 140 160
Discharge (cfs)
Pond 6P: Sand Filter
Stage -Area -Storage
Surface/Horizontal/Wetted Area (acres)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34
0 1
Storage (acre-feet)
❑ Total
■ Primary
■ Secondary
❑ Surface
S Storage

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 2-yrRainfall=3.36"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 39
Summary for Link 12L: Analysis Point 1
Inflow Area = 9.130 ac, 0.00% Impervious, Inflow Depth = 1.88" for 2-yr event
Inflow = 6.91 cfs @ 12.11 hrs, Volume= 1.433 of
Primary = 6.91 cfs @ 12.11 hrs, Volume= 1.433 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Link 12L: Analysis Point 1
Hyd rog raph
■ Inflow
❑ Primary
V 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 40
Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 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-Dev 1 Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=2.05"
Tc=20.0 min CN=71 Runoff=17.05 cfs 1.298 of
Subcatchment5S: Post Dev 1A Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=3.28"
Tc=6.0 min CN=85 Runoff=50.32 cfs 2.425 of
Subcatchment7S: Post Dev (Modified CN) Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=4.33"
Tc=6.0 min CN=95 Runoff=60.36 cfs 3.197 of
Subcatchment8S: Pre-Dev 2 Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=2.13"
Tc=8.0 min CN=72 Runoff=4.74 cfs 0.238 of
Subcatchment11S: Post Dev 1B Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=2.81"
Tc=5.0 min CN=80 Runoff=1.39 cfs 0.063 of
Subcatchment13S: Post-Dev2 Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=3.09"
Tc=5.0 min CN=83 Runoff=2.46 cfs 0.113 of
Pond 6P: Sand Filter Peak Elev=743.75' Storage=1.031 of Inflow=50.32 cfs 2.425 of
Primary=16.00 cfs 2.425 of Secondary=0.00 cfs 0.000 of Outflow=16.00 cfs 2.425 of
Link 12L: Analysis Point 1
Inflow=16.38 cfs 2.488 of
Primary=16.38 cfs 2.488 of
Total Runoff Area = 27.370 ac Runoff Volume = 7.335 of Average Runoff Depth = 3.22"
100.00% Pervious = 27.370 ac 0.00% Impervious = 0.000 ac

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 41
Summary for Subcatchment 1S: Pre-Dev 1
Runoff = 17.05 cfs @ 12.13 hrs, Volume= 1.298 af, Depth= 2.05"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-yr Rainfall=4.91"
Area (ac) CN Description
7.600 71
7.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.0 Direct Entry,
Subcatchment 1S: Pre-Dev 1
Hydrograph
---+----I------------- ---- +---+----I----
19---+-------------------------------+-------- ■Runoff
18 17.05 cfs
——— — — — —.— — — — ——----+___+--------+---+---+____
17 - ---------------- ---- -------��� @_1��24,Kr -
,i
16 -- ---------------------------'---- ------p-'-------+----'----
15 -- ------ ----- ------------------L'10-1 Rainfall;4.91a"-
14 -- ---- ---------Rtnoff Area=7.600 Ac
13 ------L---1----1----L--- ----'----L---1----1----
12 -- - ------ L---1---R-un ff-V-olMeI=1 i�98-19 -
w 11 -- --- -- -1----L---1----'----L---1----'----L---1----'----
10 ----------L ---L ----- Runoff -Depth�2.015"--
0 9 LL ------------ ---L--- ---L------''TcT20.-mlin--
7 L--------'- L-----------N�1�--
6
—__'i____'I ---------------I___I--------I ------------
5
4-------
51
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 42
Summary for Subcatchment 5S: Post Dev 1A
Runoff = 50.32 cfs @ 11.97 hrs, Volume= 2.425 af, Depth= 3.28"
Routed to Pond 6P : Sand Filter
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-yr Rainfall=4.91"
Area (ac) CN Description
8.860 85
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 5S: Post Dev 1A
Hydrograph
------- ---,- ---- ---- --------
55 ■Runoff
50.32 cfs _----�------------_�----
50 Type l( 24,lhr
45 10-Y r RainfallT4.91"
— — — — — — — — — — — - — — — — I — — — 4 — — — —II— — — — + — — — 7 — — — —I— — — — - — — — + — — — —I— — — —
40 Runoff A''reat:8.860 �llc
------------------------ --- ---- ---
35 Runpff VoIL061 2.425'laf
-i ----ri ---ri ----ri
---r---r-----------------
30 Runoff�Depth=3.28�--'
iLL Td=6.0 Mn25
zo -
-
I I �N=$5
— — — — — — - L — — — - L — — — —'— — — — L — — — L — — — —'— — — —
15
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 43
Summary for Subcatchment 7S: Post Dev (Modified CN)
Runoff = 60.36 cfs @ 11.97 hrs, Volume= 3.197 af, Depth= 4.33"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-yr Rainfall=4.91"
Area (ac) CN Description
8.860 95
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 7S: Post Dev (Modified CN)
Hydrograph
----------------- - ------1----1----
65 ■Runoff
60.36 cfs — ———— — — — ——
----_�----------_�----
60 - - --+--- ----'Type _If 24,,hr _
55
---� � 10-yx rainfall=4.91"-
50 ' i
----r--- ---- Runoff Area�$.860 Ae -
45 I I I 1 1 1
40 F
--------------- ---unoff-Volume=11'97-'af-
_ ' '
N— — — — — — — — — — — — — — — — — — — — — — L — — — L — — — —I-
35---F�urioff DepfhT33'r-
LL 30 ---------------------- -- --- L,---- -- --- T=6.'0 mlin
— — — — — — — — —.— — — — — — — — — — — — —'— — — — L — — — 1 — — — —'— — — — L — — — — — — —'— — — — L — — — L — — — —'— — — —
25 CAN=95
-------------------------- --- ---- --- ---- -- --- -
20
15
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 44
Summary for Subcatchment 8S: Pre-Dev 2
Runoff = 4.74 cfs @ 12.00 hrs, Volume= 0.238 af, Depth= 2.13"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-yr Rainfall=4.91"
Area (ac) CN Description
1.340 72
1.340 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
8.0 Direct Entry,
Subcatchment 8S: Pre-Dev 2
Hydrograph
---+---+------------------------+---+--- ■Runoff
5 4.74 cfs
Type If 24,,hr
-- ----10 Yr-Rainf-aN I - I'F"-
Runoff Area=1.340 �ac
- - Faun-pff Vol p e'=0.2384f -
3 Runoff �DepthT2.13"
LL Tc=8.'0 Min
2 ON42
1 I �
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 45
Summary for Subcatchment 11S: Post Dev 1 B
Runoff = 1.39 cfs @ 11.96 hrs, Volume= 0.063 af, Depth= 2.81"
Routed to Link 12L : Analysis Point 1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-yr Rainfall=4.91"
Area (ac) CN Description
0.270 80
0.270 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
3
0
LL
7
0L
0
Subcatchment 11S: Post Dev 1B
Hydrograph
Type II 24,,hr
10-yr Rainfall=4.91"
Runoff Area=0.270 AC
Runpff Volume=0.063'af
Runoff Depth=2.81"
Tc=5.0 min
CN=80
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 46
Summary for Subcatchment 13S: Post-Dev 2
Runoff = 2.46 cfs @ 11.96 hrs, Volume= 0.113 af, Depth= 3.09"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-yr Rainfall=4.91"
Area (ac) CN Description
0.440 83
0.440 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
3
0
LL
2
0L
0
Subcatchment 13S: Post-Dev 2
Hydrograph
Type II 24,,hr
- ---- --10-1 r_Rainfall=4.9,1"-
Runoff Area=0.440 �ac
Runoff Volume=0.113 of
Runoff Depth=3.09"
Tc=5.0 min
CAN=$3-
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 47
Summary for Pond 6P: Sand Filter
Inflow Area = 8.860 ac, 0.00% Impervious, Inflow Depth = 3.28" for 10-yr event
Inflow = 50.32 cfs @ 11.97 hrs, Volume= 2.425 of
Outflow = 16.00 cfs @ 12.09 hrs, Volume= 2.425 af, Atten= 68%, Lag= 7.2 min
Primary = 16.00 cfs @ 12.09 hrs, Volume= 2.425 of
Routed to Link 12L : Analysis Point 1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routed to nonexistent node 7L
Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Peak Elev= 743.75' @ 12.09 hrs Surf.Area= 0.285 ac Storage= 1.031 of
Plug -Flow detention time= 326.6 min calculated for 2.425 of (100% of inflow)
Center -of -Mass det. time= 326.5 min ( 1,131.6 - 805.2 )
Volume Invert Avail.Storage
Storage Description
#1 739.00'
1.751
of Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet) (acres)
(acre-feet) (acre-feet)
739.00
0.154
0.000 0.000
740.00
0.179
0.166 0.166
741.00
0.205
0.192 0.358
742.00
0.233
0.219 0.578
743.00
0.262
0.247 0.825
744.00
0.293
0.277 1.102
745.00
0.324
0.308 1.411
746.00
0.357
0.340 1.751
Device Routing
Invert
Outlet Devices
#1 Primary
737.00'
30.0" Round Culvert
L= 70.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099'/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1
739.00'
Special & User -Defined
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Disch. (cfs) 0.000 0.096 0.134 0.172 0.211 0.249 0.287 0.325
#3 Device 1
740.80'
24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Device 1
742.25'
24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1
744.25'
4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns
X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area)
Limited to weir flow at low heads
#6 Secondary
744.50'
20.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 48
Primary OutFlow Max=16.00 cfs @ 12.09 hrs HW=743.75' (Free Discharge)
L1=Culvert (Passes 16.00 cfs of 64.41 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.24 cfs)
3=Orifi ce/G rate (Orifice Controls 10.38 cfs @ 7.78 fps)
=Orifi ce/G rate (Orifice Controls 5.38 cfs @ 5.38 fps)
=Orifi ce/G rate ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge)
L6= Broad -Crested Rectangular Weir( Controls 0.00 cfs)
Pond 6P: Sand Filter
Hyd rog raph
50.32 ——I----I---T---i --— ---I---. —---- ---_
cfs
55
Inflow Area=8.860 ac__
- -
50 - Peak Elev=701 J5'--
45 - Storage='F -31-a# -
40 - ------r---
35 -------,---
N I I I
30 -----r---F — ——---I------r---F------I--- ------r---
3 I I I I I I I I I I I I
0 25 ----- r- - -F — -----I------r---F------I------_T---T_
LL 16.00 cfs
-- 16.00cfs _—. — — —— I I I I I I I I I I I I
A
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
a
ry

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Paae 49
746
745
744
w
w 743
c
0
.�
w 742
w
741
740
739
0
Pond 6P: Sand Filter
Stage -Discharge
20 40 60 80 100 120 140 160
Discharge (cfs)
Pond 6P: Sand Filter
Stage -Area -Storage
Surface/Horizontal/Wetted Area (acres)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34
0 1
Storage (acre-feet)
❑ Total
■ Primary
■ Secondary
❑ Surface
S Storage

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type//24-hr 10-yrRainfall=4.91"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 50
Summary for Link 12L: Analysis Point 1
Inflow Area = 9.130 ac, 0.00% Impervious, Inflow Depth = 3.27" for 10-yr event
Inflow = 16.38 cfs @ 12.07 hrs, Volume= 2.488 of
Primary = 16.38 cfs @ 12.07 hrs, Volume= 2.488 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
1
1
1
1
1
1
1
1
N
� 1
3
0
LL
Link 12L: Analysis Point 1
Hyd rog raph
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Inflow
❑ Primary

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 51
Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 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-Dev 1 Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=2.76"
Tc=20.0 min CN=71 Runoff=23.23 cfs 1.750 of
Subcatchment5S: Post Dev 1A Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=4.14"
Tc=6.0 min CN=85 Runoff=62.64 cfs 3.058 of
Subcatchment7S: Post Dev (Modified CN) Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=5.24"
Tc=6.0 min CN=95 Runoff=72.25 cfs 3.871 of
Subcatchment8S: Pre-Dev 2 Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=2.85"
Tc=8.0 min CN=72 Runoff=6.35 cfs 0.319 of
Subcatchment11S: Post Dev 1B Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=3.63"
Tc=5.0 min CN=80 Runoff=1.78 cfs 0.082 of
Subcatchment13S: Post-Dev2 Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=3.93"
Tc=5.0 min CN=83 Runoff=3.09 cfs 0.144 of
Pond 6P: Sand Filter Peak Elev=744.51' Storage=1.255 of Inflow=62.64 cfs 3.058 of
Primary=25.65 cfs 3.058 of Secondary=0.05 cfs 0.000 of Outflow=25.70 cfs 3.058 of
Link 12L: Analysis Point 1
Inflow=26.20 cfs 3.140 of
Primary=26.20 cfs 3.140 of
Total Runoff Area = 27.370 ac Runoff Volume = 9.224 of Average Runoff Depth = 4.04"
100.00% Pervious = 27.370 ac 0.00% Impervious = 0.000 ac

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 52
Summary for Subcatchment 1S: Pre-Dev 1
Runoff = 23.23 cfs @ 12.13 hrs, Volume= 1.750 af, Depth= 2.76"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-yr Rainfall=5.83"
Area (ac) CN Description
7.600 71
7.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.0 Direct Entry,
Subcatchment 1S: Pre-Dev 1
Hydrograph
26
25
--- r--------r
--- ---- L---1----1----
---r------------ r---r--------� ---
■Runoff
23.23 cfs
24
23
--J----1---L---L------L--— ---L--------------L--------L-----L----'----
-------,-----------------------------L--------''Tyne-Ni24,ft-
--
22
21
20
--
--
--
----------
-------r---T-----------r-----------25= r_Rainfait;5.B,3"--
-----1---1---J----1----L---1----'--6-
19
--
w7� y,
---,-------r---A----I----r-------Ir-FFOkJ1�-�kKg L �� �lr,
16
--
-------;---r---r----r---r---r---R-un�ff-�t�lt�r-
w
,i
--
-------r---r---r--------r---r----r---r---r--------r---r---r----
Runoff Dp-�q tFYTZ 76"--
—,"
13
0 12
LL 11
--
--
--
-----r---r---r--------r—--r----r---r---r----I --- r---r---r----
------- 1----1---J----1----L---1--------L---L---- '-
-- - -------------------- - - -- '�CT2O.�i-FY�IfI--
--- -r- -r- -r- -r- -r- -- _r -r- r-
10
,i
--
-------'-----------------------------r-------'---- - �f
-#-'--
7
---,----------------------------------r------------r----,----
�i
1
4
3
-
- -
---'----'-----------------------------------------------=----'----
.............................................................
----_-------------------------------------------------------
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 53
Summary for Subcatchment 5S: Post Dev 1A
Runoff = 62.64 cfs @ 11.97 hrs, Volume= 3.058 af, Depth= 4.14"
Routed to Pond 6P : Sand Filter
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-yr Rainfall=5.83"
Area (ac) CN Description
8.860 85
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 5S: Post Dev 1A
Hydrograph
---7-------------r---rt- I ----
70
-
--------- - - ---- - - -- -- - - ----------- - --T-------- ■Runoff
65 62.64 cfs i
—————————————----
60 Type rl, Z4_,r�r
— — — — — — — — — — — — — — — - — — — — L — — — — — — — —I— — — — L — — — L — — — —I— — — — L — — — 1 — — — —1— — — —
55 Y 25-vr RainfallT5.8',3" - --------------- --
50 - - -Run off Area=8.860 �ac
45 ---- --- --JF un'off -V-0I4me,=3,158-a#-
w 40 -- ------Ru-nof# Deptli=4'fi4"--
w — — — — — — —.— — — — — — — — — — — — —'— — — — L — 1 — I—
3 35
------------------- - - -
--- --- --- --- 1-=6.0-mlin -
LL 30
--------------------------� ---
i r--- r ----r r---r-- i- r---
25 N=$5
20
15
10
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 54
Summary for Subcatchment 7S: Post Dev (Modified CN)
Runoff = 72.25 cfs @ 11.97 hrs, Volume= 3.871 af, Depth= 5.24"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-yr Rainfall=5.83"
Area (ac) CN Description
8.860 95
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 7S: Post Dev (Modified CN)
Hydrograph
---1----1------------- - ----1--------
80 ---i ----------- ■Runoff
75 72.25 cfs
— — — — — — — — —'— — -
70 � I, ---- � --- � ----T -- a II� 24,hr
65
60
---- -- ---- 2�- ainfal".8',3„
------------- RUnoff-A'rea=$.W Ac -
55
50 ------ F�ungff_VoltimO3.071-'af -
45 ------------------ --- ----Ru-noff IDepth�62�411-- ----- ----
0 40 --------------------------'I-----------'I-------'--1 &C Min
LL 35
30N=-
25
20
15
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 55
Summary for Subcatchment 8S: Pre-Dev 2
Runoff = 6.35 cfs @ 12.00 hrs, Volume= 0.319 af, Depth= 2.85"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-yr Rainfall=5.83"
Area (ac) CN Description
1.340 72
1.340 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
8.0 Direct Entry,
Subcatchment 8S: Pre-Dev 2
Hydrograph
---! -----------------! ---
■Runoff
6.35 cfs
--------- - ------- Type 1t-24Jhr-
6
25-yr RainfallT5.83"
—' — — — —'— — — — L — — — — — — —I--- — L — — — L — — — —' — — — —'— — — — L — — —
5 Runoff Area=1.340 �c
-- - - -!--RunApff Vo1Pme=O.$1_9 af-
4 RunoffDepth-2.85"
LL - ---- T&8.0 i tm
3
----
ON42
2
������
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 56
Summary for Subcatchment 11S: Post Dev 1 B
Runoff = 1.78 cfs @ 11.96 hrs, Volume= 0.082 af, Depth= 3.63"
Routed to Link 12L : Analysis Point 1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-yr Rainfall=5.83"
Area (ac) CN Description
0.270 80
0.270 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0L
0
Subcatchment 11S: Post Dev 1B
Hydrograph
Type II 24-hr
25-yr Rainfall=5.83"
Runoff Area=0.270 ac
Runoff Volume=0.082 of
- -
-------+------- Runoff -Depth=3.63"-
Tc=5.0 min
CN=80
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 57
Summary for Subcatchment 13S: Post-Dev 2
Runoff = 3.09 cfs @ 11.96 hrs, Volume= 0.144 af, Depth= 3.93"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-yr Rainfall=5.83"
Area (ac) CN Description
0.440 83
0.440 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
3
H 2
3
0
LL
0L
0
Subcatchment 13S: Post-Dev 2
Hydrograph
-- Type II 24,,hr
25-yr Rainfall=5.83"
Runoff Area=0.440 � ac
- - - - - - - i - - Aunoff Vol u me=0.144 oaf -
Runoff Depth=3.93"
Tc=5.0 min
CN=03
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 58
Summary for Pond 6P: Sand Filter
Inflow Area = 8.860 ac, 0.00% Impervious, Inflow Depth = 4.14" for 25-yr event
Inflow = 62.64 cfs @ 11.97 hrs, Volume= 3.058 of
Outflow = 25.70 cfs @ 12.07 hrs, Volume= 3.058 af, Atten= 59%, Lag= 6.2 min
Primary = 25.65 cfs @ 12.07 hrs, Volume= 3.058 of
Routed to Link 12L : Analysis Point 1
Secondary = 0.05 cfs @ 12.07 hrs, Volume= 0.000 of
Routed to nonexistent node 7L
Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Peak Elev= 744.51' @ 12.07 hrs Surf.Area= 0.309 ac Storage= 1.255 of
Plug -Flow detention time= 269.8 min calculated for 3.058 of (100% of inflow)
Center -of -Mass det. time= 270.2 min ( 1,068.7 - 798.6 )
Volume Invert Avail.Storage
Storage Description
#1 739.00'
1.751
of Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet) (acres)
(acre-feet) (acre-feet)
739.00
0.154
0.000 0.000
740.00
0.179
0.166 0.166
741.00
0.205
0.192 0.358
742.00
0.233
0.219 0.578
743.00
0.262
0.247 0.825
744.00
0.293
0.277 1.102
745.00
0.324
0.308 1.411
746.00
0.357
0.340 1.751
Device Routing
Invert
Outlet Devices
#1 Primary
737.00'
30.0" Round Culvert
L= 70.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099'/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1
739.00'
Special & User -Defined
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Disch. (cfs) 0.000 0.096 0.134 0.172 0.211 0.249 0.287 0.325
#3 Device 1
740.80'
24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Device 1
742.25'
24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1
744.25'
4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns
X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area)
Limited to weir flow at low heads
#6 Secondary
744.50'
20.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 59
Primary OutFlow Max=25.60 cfs @ 12.07 hrs HW=744.50' (Free Discharge)
L1=Culvert (Passes 25.60 cfs of 69.14 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.27 cfs)
3=Orifi ce/G rate (Orifice Controls 11.78 cfs @ 8.84 fps)
=Orifi ce/G rate (Orifice Controls 6.81 cfs @ 6.81 fps)
=Orifi ce/G rate (Weir Controls 6.73 cfs @ 1.65 fps)
Secondary OutFlow Max=0.02 cfs @ 12.07 hrs HW=744.51' (Free Discharge)
L6= Broad -Crested Rectangular Weir(Weir Controls 0.02 cfs @ 0.18 fps)
Pond 6P: Sand Filter
Hyd rog raph
i
L--- L----------J------ - - - - -
-----'---�---1---L---
'—'Inflow
62.64 cfs
� �
Outflow
---
T -- - -----1lfroWAra-8&60 a-
------------
70
---------- --- --- ---
Secondary a ry
65
----------------------,------
--- --Peak-Elev=744.51'--
60
-
,--- ,---
---------------------------Stdracie=4.-255-af -
55
-
----t---r-------------t---r-------------rt---r---
45
-
-
---L--- L-------'------L--- L-------'------s---L---
w 40
w
V
35
3
2570 cfs
- ------ --- ------------- --- --- ---
-----------
O
a 30
25.65 cfs
i
25
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type // 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Paae 60
746
745
744
w
w 743
c
0
.�
w 742
w
741
740
739
0
Pond 6P: Sand Filter
Stage -Discharge
20 40 60 80 100 120 140 160
Discharge (cfs)
Pond 6P: Sand Filter
Stage -Area -Storage
Surface/Horizontal/Wetted Area (acres)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34
0 1
Storage (acre-feet)
❑ Total
■ Primary
■ Secondary
❑ Surface
S Storage

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 25-yr Rainfall=5.83"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 61
Summary for Link 12L: Analysis Point 1
Inflow Area = 9.130 ac, 0.00% Impervious, Inflow Depth = 4.13" for 25-yr event
Inflow = 26.20 cfs @ 12.07 hrs, Volume= 3.140 of
Primary = 26.20 cfs @ 12.07 hrs, Volume= 3.140 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Link 12L: Analysis Point 1
Hyd rog raph
■ Inflow
❑ Primary
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 62
Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 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-Dev 1 Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=3.36"
Tc=20.0 min CN=71 Runoff=28.40 cfs 2.131 of
Subcatchment5S: Post Dev 1A Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=4.84"
Tc=6.0 min CN=85 Runoff=72.53 cfs 3.575 of
Subcatchment7S: Post Dev (Modified CN) Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=5.98"
Tc=6.0 min CN=95 Runoff=81.77 cfs 4.414 of
Subcatchment8S: Pre-Dev 2 Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=3.47"
Tc=8.0 min CN=72 Runoff=7.69 cfs 0.387 of
Subcatchment11S: Post Dev 1B Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=4.30"
Tc=5.0 min CN=80 Runoff=2.09 cfs 0.097 of
Subcatchment13S: Post-Dev2 Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=4.62"
Tc=5.0 min CN=83 Runoff=3.60 cfs 0.170 of
Pond 6P: Sand Filter Peak Elev=744.77' Storage=1.337 of Inflow=72.53 cfs 3.575 of
Primary=39.43 cfs 3.530 of Secondary=7.11 cfs 0.045 of Outflow=46.54 cfs 3.575 of
Link 12L: Analysis Point 1
Inflow=40.52 cfs 3.626 of
Primary=40.52 cfs 3.626 of
Total Runoff Area = 27.370 ac Runoff Volume = 10.773 of Average Runoff Depth = 4.72"
100.00% Pervious = 27.370 ac 0.00% Impervious = 0.000 ac

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 63
Summary for Subcatchment 1S: Pre-Dev 1
Runoff = 28.40 cfs @ 12.13 hrs, Volume= 2.131 af, Depth= 3.36"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-yr Rainfall=6.57"
Area (ac) CN Description
7.600 71
7.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.0 Direct Entry,
Subcatchment 1S: Pre-Dev 1
Hydrograph
---------------------------- r---+----I---- ■Runoff
30 28.400rs -----
-------
------------------------------
28 ' --------------------- ----!---,----IIIType-If 2-44 r--
26
------------- ---' ---------50= r Rainfall.*.-51,7„ -
24
-- r--- RW offAlrea�7.-offA-
22 -- r------------------L--- ----1----L---1----I----
20 -- - ------------- F�ungff-V_oI 6=2,1_31-Iliaf H -
18
w -- ------------------------------------- Runoff lDepth=136"--
3 16
I
14--- TCT20.10 fY�Iri
-------------r---r-----------r---t-w-'--I----
12-----------------I --- III--------I--N-a--
10
i--------____Y---T----_---r---Y--------Y---Y----I----
6
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 64
Summary for Subcatchment 5S: Post Dev 1A
Runoff = 72.53 cfs @ 11.97 hrs, Volume= 3.575 af, Depth= 4.84"
Routed to Pond 6P : Sand Filter
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-yr Rainfall=6.57"
Area (ac) CN Description
8.860 85
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 5S: Post Dev 1A
Hydrograph
80
■ Runoff
75 72.53 cfs i i
— — — — —I— — — —.— — — — — — — — — — — — — — + — — — — — — —i nI _ _r + I _
65 SO- 1 RainfaI1:;S._57"�
60-----L---1----1--ftnoff-A'rea=$.$6fltic -
55 I I I I I I 1
r--- r--- ----
50------- -------F(unoff-Volume-3.75_af -
w 45 ----------------------'---- ---Puna# Depth=; # oFF��--
----i-
3 40
---------------------- lin
35 r=�.0-m-
LL
30------', ----I T
25
20
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 65
Summary for Subcatchment 7S: Post Dev (Modified CN)
Runoff = 81.77 cfs @ 11.97 hrs, Volume= 4.414 af, Depth= 5.98"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-yr Rainfall=6.57"
Area (ac) CN Description
8.860 95
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 7S: Post Dev (Modified CN)
Hydrograph
-------'------------- --'---------'----
90 ■Runoff
85 81.77 cfs
_—— — — — — —-—— — — — —— --——i--—i--——————i--—i————————
80 ------- - - - - --- - - - - -- ----r---,---- IType-1144,11hr_-
75 50- Rainfa11T6.v�
--------------------- ---- _ a�
70 ---------------------+---- +--w�-----I----+---I-----I----
6s ------- - - - - -—-----L---1----IL-Runoff Area.8.860'3r,-
55 F unQ - o1LIme; 4: 'C4 ai -
u 50 ------------------ - - - n --- ---- ------Ru-nof Depth�rJ.J8---
V------------------
40 -- - --- --- -----=�.'0-mlin -
-- r---r----r---r---r----i----r---r---- i----
35 --------------------------I-----------I -----------r--CAN=-$6
30 -- ------------------------+---+--------+---+--------+---+--------
25 -----------------'----L----1---------------1----L---1---J----
20 -- -- 1----1---
15
10 -
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 66
Summary for Subcatchment 8S: Pre-Dev 2
Runoff = 7.69 cfs @ 12.00 hrs, Volume= 0.387 af, Depth= 3.47"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-yr Rainfall=6.57"
Area (ac) CN Description
1.340 72
1.340 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
8.0 Direct Entry,
N �
0 4
LL
3
2
1
0
0
Subcatchment 8S: Pre-Dev 2
Hydrograph
--- I----�----�------------- �----�----� --- � --- ■Runoff
7.69 cfs
-- --------- ------ ----+Type 1112.4,
50-yr RainfallT6.517"
Runoff Area=1.340 �ac
-----Ounpff Volum6 O.U-7 of-
Runo_ff_ Depth=3.417"
Td=8.'0 Min
u= 2
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 67
Summary for Subcatchment 11S: Post Dev 1 B
Runoff = 2.09 cfs @ 11.96 hrs, Volume= 0.097 af, Depth= 4.30"
Routed to Link 12L : Analysis Point 1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-yr Rainfall=6.57"
Area (ac) CN Description
0.270 80
0.270 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
2
0L
0
Subcatchment 11S: Post Dev 1B
Hydrograph
2.09 cfs
----------- - -Type ]t 24,�r
50-yr Rainfall=6.57'
Runoff Area=0.270 ac
Runoff Volume=0.097 of
Runoff Depth=4.30"
--- -- --- ---- Tc=5Z rriin-
PN=80
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 68
Summary for Subcatchment 13S: Post-Dev 2
Runoff = 3.60 cfs @ 11.96 hrs, Volume= 0.170 af, Depth= 4.62"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-yr Rainfall=6.57"
Area (ac) CN Description
0.440 83
0.440 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
3 2
0
LL
Subcatchment 13S: Post-Dev 2
Hydrograph
Type II 24,,hr
------i,---+---- 50-yr-Rainfal1=6: ----
Runoff Area=0.440 ac
Runoff Volume=0.170'O
Runoff Depth= 4:62"-
Tc=5.'0 min
CAN=83
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 69
Summary for Pond 6P: Sand Filter
Inflow Area = 8.860 ac, 0.00% Impervious, Inflow Depth = 4.84" for 50-yr event
Inflow = 72.53 cfs @ 11.97 hrs, Volume= 3.575 of
Outflow = 46.54 cfs @ 12.04 hrs, Volume= 3.575 af, Atten= 36%, Lag= 4.3 min
Primary = 39.43 cfs @ 12.04 hrs, Volume= 3.530 of
Routed to Link 12L : Analysis Point 1
Secondary = 7.11 cfs @ 12.04 hrs, Volume= 0.045 of
Routed to nonexistent node 7L
Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Peak Elev= 744.77' @ 12.04 hrs Surf.Area= 0.317 ac Storage= 1.337 of
Plug -Flow detention time= 237.3 min calculated for 3.575 of (100% of inflow)
Center -of -Mass det. time= 237.3 min ( 1,031.4 - 794.2 )
Volume Invert Avail.Storage
Storage Description
#1 739.00'
1.751
of Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet) (acres)
(acre-feet) (acre-feet)
739.00
0.154
0.000 0.000
740.00
0.179
0.166 0.166
741.00
0.205
0.192 0.358
742.00
0.233
0.219 0.578
743.00
0.262
0.247 0.825
744.00
0.293
0.277 1.102
745.00
0.324
0.308 1.411
746.00
0.357
0.340 1.751
Device Routing
Invert
Outlet Devices
#1 Primary
737.00'
30.0" Round Culvert
L= 70.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099'/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1
739.00'
Special & User -Defined
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Disch. (cfs) 0.000 0.096 0.134 0.172 0.211 0.249 0.287 0.325
#3 Device 1
740.80'
24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Device 1
742.25'
24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1
744.25'
4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns
X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area)
Limited to weir flow at low heads
#6 Secondary
744.50'
20.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 70
Primary OutFlow Max=39.36 cfs @ 12.04 hrs HW=744.77' (Free Discharge)
L1=Culvert (Passes 39.36 cfs of 70.73 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.28 cfs)
3=Orifi ce/G rate (Orifice Controls 12.24 cfs @ 9.18 fps)
=Orifi ce/G rate (Orifice Controls 7.25 cfs @ 7.25 fps)
=Orifi ce/G rate (Weir Controls 19.60 cfs @ 2.36 fps)
Secondary OutFlow Max=7.04 cfs @ 12.04 hrs HW=744.77' (Free Discharge)
L6= Broad -Crested Rectangular Weir(Weir Controls 7.04 cfs @ 1.31 fps)
45=
3 40
LL 35
30
25
20
15
10
5
0
0
Pond 6P: Sand Filter
Hyd rog raph
-! -------' ---'-------------------------
-----------
CS
PeeKEfev�7 .-�,�' - ——
---r—— —r — — —,--- ,—--�---r— r
----r---r---r------r---r---r----------r---r---r---
M0raAe=4.-337-& -
46.54 cfs
39.43 cfs —-- — -- -- -- — — -- -------1---r---
----'----'----'----'----'---'----'----'----'----'----'-------VA
-
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
a
ry

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Paae 71
746
745
744
w
w 743
c
0
.�
w 742
w
741
740
739
0
Pond 6P: Sand Filter
Stage -Discharge
20 40 60 80 100 120 140 160
Discharge (cfs)
Pond 6P: Sand Filter
Stage -Area -Storage
Surface/Horizontal/Wetted Area (acres)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34
0 1
Storage (acre-feet)
❑ Total
■ Primary
■ Secondary
❑ Surface
S Storage

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type/1 24-hr 50-yr Rainfall=6.57"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 72
Summary for Link 12L: Analysis Point 1
Inflow Area = 9.130 ac, 0.00% Impervious, Inflow Depth = 4.77" for 50-yr event
Inflow = 40.52 cfs @ 12.04 hrs, Volume= 3.626 of
Primary = 40.52 cfs @ 12.04 hrs, Volume= 3.626 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Link 12L: Analysis Point 1
Hyd rog raph
■ Inflow
❑ Primary
V 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 73
Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 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-Dev 1 Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=3.99"
Tc=20.0 min CN=71 Runoff=33.77 cfs 2.530 of
Subcatchment5S: Post Dev 1A Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=5.56"
Tc=6.0 min CN=85 Runoff=82.54 cfs 4.104 of
Subcatchment7S: Post Dev (Modified CN) Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=6.72"
Tc=6.0 min CN=95 Runoff=91.41 cfs 4.965 of
Subcatchment8S: Pre-Dev 2 Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=4.10"
Tc=8.0 min CN=72 Runoff=9.07 cfs 0.458 of
Subcatchment11S: Post Dev 1B Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=4.99"
Tc=5.0 min CN=80 Runoff=2.40 cfs 0.112 of
Subcatchment13S: Post-Dev2 Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=5.33"
Tc=5.0 min CN=83 Runoff=4.11 cfs 0.195 of
Pond 6P: Sand Filter Peak Elev=744.93' Storage=1.389 of Inflow=82.54 cfs 4.104 of
Primary=49.80 cfs 3.987 of Secondary=14.72 cfs 0.117 of Outflow=64.52 cfs 4.104 of
Link 12L: Analysis Point 1
Inflow=51.42 cfs 4.099 of
Primary=51.42 cfs 4.099 of
Total Runoff Area = 27.370 ac Runoff Volume = 12.365 of Average Runoff Depth = 5.42"
100.00% Pervious = 27.370 ac 0.00% Impervious = 0.000 ac

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 74
Summary for Subcatchment 1S: Pre-Dev 1
Runoff = 33.77 cfs @ 12.13 hrs, Volume= 2.530 af, Depth= 3.99"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-yr Rainfall=7.32"
Area (ac) CN Description
7.600 71
7.600 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.0 Direct Entry,
36
33.77 cfs
34
32
30
28 � -- -
26 - -
24 � --
22 - -
20 ''----------------
0 18 ---------------
LL 16
14
12
10
Subcatchment 1S: Pre-Dev 1
Hydrograph
-� � � � - - - ■Runoff
-- ----'Type-tl'', 24_11,h-r-
-----r-------- 1GO-yx Rainfall-47 �2"--
- - - - - - Rw n off`A'rea=7.-600 Ac -
--- ------ F�unpff-V-oI me1=-2.$-30-''0 -
—�— — — — — — — — — — —�— — — — L — — — I — — — — 11 — — — 1 — — — —�— —
-' --- ---- RundffDeipth;399"--
L---1--------L-------- 1T&20.0-FY in -
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 75
Summary for Subcatchment 5S: Post Dev 1A
Runoff = 82.54 cfs @ 11.97 hrs, Volume= 4.104 af, Depth= 5.56"
Routed to Pond 6P : Sand Filter
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-yr Rainfall=7.32"
Area (ac) CN Description
8.860 85
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 5S: Post Dev 1A
Hydrograph
g0 ■Runoff
r--------- r--- --� ---------------r----I----
85 82.54 cfs I I
80 ----------- - - - -- - - -----4----I----+--- ----1T Pe-11+24,1Ihr -
75 ------------------ ----';---;-------1�)0=y1r<Rainfaflr1.32"--
70 ------------ - - - - -------L---1----1----L--- ----'----L---1----1----
65 - - - - - - - - - -'- -Runoff Areat:"6_0'mac _
60 ---------- ---RuOff-Yo1Ome=4-.1-04-'Iaf-
------------------
ss
-- --------------- -----I-
N
I T
50-
---r- ------Rugoff Depth-T_556"
0 45 --------------------------I-----------I-------- �{ �c --
in
a 40 �f`.�V.O --
35 ---------------------- ----+---+--------+---+--------+--Y � N =-$ S - 30 -------------------------- ----------- ----------- -----------
25 -- -------1----1---J----1----L---1----'----L---L--------L---1----'----
20
15
10
1 6
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 76
Summary for Subcatchment 7S: Post Dev (Modified CN)
Runoff = 91.41 cfs @ 11.97 hrs, Volume= 4.965 af, Depth= 6.72"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-yr Rainfall=7.32"
Area (ac) CN Description
8.860 95
8.860 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 7S: Post Dev (Modified CN)
Hydrograph
100----------------------
95 91.41 cfs _ _ ! _ _ _ _I_
90 -- ------'------------- -- - ----------- I Ype-l[44-hr-
85 -- ------'---- -----1----L---L------------L---L--------'----
80 -- ------'----------------+--a00-y-r Rainfall=73T
75 -- -- - --------- --- -Runoff Ate&:8.3 0-Qc -
70 —— r----I----r---Y----I----I----r---r----I----I----
65 I--------r___RunWVo*me=4.$654f
60 I --------- r--- T----I- - --
---T-----------I----
u 55----------
- ------RnoffDep#h=�61"-
------ 3 so - ------------'I ----------------------- -----
LL 45 I------------------------------------T=6.�0_rin_
40-----------------L--- L------------L ---L
35 I-----------------I---L----I---- I----L ---_L
30 I - - - - - - - - - - - - - - - - - - - - - - - - - - ----I---- -----------I----
------------------------------------
20 I - - - ------------------------------ - - - - - - - - - - - - - - - ----I----
15 ---------------------------------------------------------I----
10 -----------------------------------------------------------
5
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 77
Summary for Subcatchment 8S: Pre-Dev 2
Runoff = 9.07 cfs @ 11.99 hrs, Volume= 0.458 af, Depth= 4.10"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-yr Rainfall=7.32"
Area (ac) CN Description
1.340 72
1.340 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
8.0 Direct Entry,
Subcatchment 8S: Pre-Dev 2
Hydrograph
------------------ --------!----'----
10 ■Runoff
9.07 cfs — —— _——--—--1—-
9 IType If 24,Ihr
-------------------------------r-------I----
8 100-yr RainfallT7.32"
------------------ --- ---
7 __RUno�A'rea==1.340-Ac -
I I I I
--------------------------r------ F�unpff-Volume'=0.�53-'af -
6
I I I---Rtuna# Depth:;4.10"--
3 5
LL - --- --- --TAt=$-niln--
I I I I I
4 -- CAN=72
-- - ---- ----------- --- --I----
3
-----+----i----
2 1
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 78
Summary for Subcatchment 11S: Post Dev 1 B
Runoff = 2.40 cfs @ 11.96 hrs, Volume= 0.112 af, Depth= 4.99"
Routed to Link 12L : Analysis Point 1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-yr Rainfall=7.32"
Area (ac) CN Description
0.270 80
0.270 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
3
0
LL
2
0L
0
Subcatchment 11S: Post Dev 1B
Hydrograph
Type II 24,Ihr
------1-00-yr-Rainfal1=7.32"-
Runoff Area=0.270 ac
Runoff Volume=0.112 of
Runoff Depth=4.99"
Tc=5.0 min
_PN=$O
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
❑ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 79
Summary for Subcatchment 13S: Post-Dev 2
Runoff = 4.11 cfs @ 11.96 hrs, Volume= 0.195 af, Depth= 5.33"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-yr Rainfall=7.32"
Area (ac) CN Description
0.440 83
0.440 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
4
3
N
3
0
LL 2
1
0
0
Subcatchment 13S: Post-Dev 2
Hydrograph
- --- Type If N4 hr
100-yr Rainfall=7.32"
Runoff Are&0.440-cItc--
Runoff Volume=0.195',af
Runoff Depth=5.33"
- - Td=&O rein -
PN=$3
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)
■ Runoff

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 80
Summary for Pond 6P: Sand Filter
Inflow Area = 8.860 ac, 0.00% Impervious, Inflow Depth = 5.56" for 100-yr event
Inflow = 82.54 cfs @ 11.97 hrs, Volume= 4.104 of
Outflow = 64.52 cfs @ 12.02 hrs, Volume= 4.104 af, Atten= 22%, Lag= 3.2 min
Primary = 49.80 cfs @ 12.02 hrs, Volume= 3.987 of
Routed to Link 12L : Analysis Point 1
Secondary = 14.72 cfs @ 12.02 hrs, Volume= 0.117 of
Routed to nonexistent node 7L
Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Peak Elev= 744.93' @ 12.02 hrs Surf.Area= 0.322 ac Storage= 1.389 of
Plug -Flow detention time= 211.9 min calculated for 4.104 of (100% of inflow)
Center -of -Mass det. time= 211.8 min ( 1,002.1 - 790.3 )
Volume Invert Avail.Storage
Storage Description
#1 739.00'
1.751
of Custom Stage Data (Prismatic)-isted below (Recalc)
Elevation Surf.Area
Inc.Store Cum.Store
(feet) (acres)
(acre-feet) (acre-feet)
739.00
0.154
0.000 0.000
740.00
0.179
0.166 0.166
741.00
0.205
0.192 0.358
742.00
0.233
0.219 0.578
743.00
0.262
0.247 0.825
744.00
0.293
0.277 1.102
745.00
0.324
0.308 1.411
746.00
0.357
0.340 1.751
Device Routing
Invert
Outlet Devices
#1 Primary
737.00'
30.0" Round Culvert
L= 70.4' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099'/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1
739.00'
Special & User -Defined
Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00
Disch. (cfs) 0.000 0.096 0.134 0.172 0.211 0.249 0.287 0.325
#3 Device 1
740.80'
24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Device 1
742.25'
24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#5 Device 1
744.25'
4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns
X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area)
Limited to weir flow at low heads
#6 Secondary
744.50'
20.0' long x 10.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 81
Primary OutFlow Max=49.68 cfs @ 12.02 hrs HW=744.93' (Free Discharge)
L1=Culvert (Passes 49.68 cfs of 71.68 cfs potential flow)
2=Special & User -Defined (Custom Controls 0.28 cfs)
3=Orifi ce/G rate (Orifice Controls 12.51 cfs @ 9.38 fps)
=Orifi ce/G rate (Orifice Controls 7.50 cfs @ 7.50 fps)
=Orifi ce/G rate (Weir Controls 29.38 cfs @ 2.70 fps)
Secondary OutFlow Max=14.59 cfs @ 12.02 hrs HW=744.93' (Free Discharge)
L6= Broad -Crested Rectangular Weir(Weir Controls 14.59 cfs @ 1.69 fps)
Pond 6P: Sand Filter
Hyd rog raph
-------
---------
- - ----
- -
---------- ------------,---
-------------i---
r Inflow
82.54 cfs
outflow
--------�---I----
I---L1f1f'^WAreN1
&860iAic-
Primary
90
Secondary
85
---
-=---I---
-_-
- - ---� r-
E[ev? 44F91
80
- ----
-t-
-'r- --- -----i
-t-yea[ -
75
- 64.52cfs---
/ '�F/65
----
-----------
-----
-
- - -�o rag=�I�319--
70
60
----
49.80 cfs - - -
---L---
- ---
----I---
-------I---
---
---
---L-------I------L---L---
--- -------I--- - - - - - - - - ---
55
I
I I I
I
I I I I I I I
u 50
3 45
-
o-------------------T------------------T---T---I----
a 40
35
- ---
L ---
L-------I ---
---
L --- L-------I --- --- 1 --- L ---
30
25
20
14.72 cfs
15
10
5
0
0
10 20 30 40 50
60
70 80 90
100
110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Paae 82
746
745
744
w
w 743
c
0
.�
w 742
w
741
740
739
0
Pond 6P: Sand Filter
Stage -Discharge
20 40 60 80 100 120 140 160
Discharge (cfs)
Pond 6P: Sand Filter
Stage -Area -Storage
Surface/Horizontal/Wetted Area (acres)
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 0.32 0.34
0 1
Storage (acre-feet)
❑ Total
■ Primary
■ Secondary
❑ Surface
S Storage

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Type 1124-hr 100-yr Rainfall=7.32"
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 83
Summary for Link 12L: Analysis Point 1
Inflow Area = 9.130 ac, 0.00% Impervious, Inflow Depth = 5.39" for 100-yr event
Inflow = 51.42 cfs @ 12.02 hrs, Volume= 4.099 of
Primary = 51.42 cfs @ 12.02 hrs, Volume= 4.099 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs
Link 12L: Analysis Point 1
Hyd rog raph
■ Inflow
❑ Primary
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
Time (hours)

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 84
Events for Subcatchment 1S: Pre-Dev 1
Event
Rainfall
(inches)
Runoff
(cfs)
Volume
(acre-feet)
Depth
(inches)
1-inch
1.00
0.01
0.005
0.01
1-yr
2.78
4.65
0.404
0.64
2-yr
3.36
7.64
0.618
0.98
10-yr
4.91
17.05
1.298
2.05
25-yr
5.83
23.23
1.750
2.76
50-yr
6.57
28.40
2.131
3.36
100-yr
7.32
33.77
2.530
3.99

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 85
Events for Subcatchment 5S: Post Dev 1A
Event
Rainfall
(inches)
Runoff
(cfs)
Volume
(acre-feet)
Depth
(inches)
1-inch
1.00
2.41
0.128
0.17
1-yr
2.78
22.23
1.038
1.41
2-yr
3.36
29.74
1.399
1.89
10-yr
4.91
50.32
2.425
3.28
25-yr
5.83
62.64
3.058
4.14
50-yr
6.57
72.53
3.575
4.84
100-yr
7.32
82.54
4.104
5.56

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 86
Events for Subcatchment 7S: Post Dev (Modified CN)
Event
Rainfall
(inches)
Runoff
(cfs)
Volume
(acre-feet)
Depth
(inches)
1-inch
1.00
8.84
0.416
0.56
1-yr
2.78
32.53
1.650
2.23
2-yr
3.36
40.17
2.069
2.80
10-yr
4.91
60.36
3.197
4.33
25-yr
5.83
72.25
3.871
5.24
50-yr
6.57
81.77
4.414
5.98
100-yr
7.32
91.41
4.965
6.72

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 87
Events for Subcatchment 8S: Pre-Dev 2
Event
Rainfall
(inches)
Runoff
(cfs)
Volume
(acre-feet)
Depth
(inches)
1-inch
1.00
0.00
0.001
0.01
1-yr
2.78
1.43
0.076
0.68
2-yr
3.36
2.24
0.115
1.03
10-yr
4.91
4.74
0.238
2.13
25-yr
5.83
6.35
0.319
2.85
50-yr
6.57
7.69
0.387
3.47
100-yr
7.32
9.07
0.458
4.10

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 88
Events for Subcatchment 11S: Post Dev 1B
Event
Rainfall
(inches)
Runoff
(cfs)
Volume
(acre-feet)
Depth
(inches)
1-inch
1.00
0.02
0.002
0.08
1-yr
2.78
0.55
0.024
1.09
2-yr
3.36
0.77
0.034
1.53
10-yr
4.91
1.39
0.063
2.81
25-yr
5.83
1.78
0.082
3.63
50-yr
6.57
2.09
0.097
4.30
100-yr
7.32
2.40
0.112
4.99

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 89
Events for Subcatchment 13S: Post-Dev 2
Event
Rainfall
(inches)
Runoff
(cfs)
Volume
(acre-feet)
Depth
(inches)
1-inch
1.00
0.08
0.005
0.13
1-yr
2.78
1.04
0.047
1.27
2-yr
3.36
1.42
0.064
1.74
10-yr
4.91
2.46
0.113
3.09
25-yr
5.83
3.09
0.144
3.93
50-yr
6.57
3.60
0.170
4.62
100-yr
7.32
4.11
0.195
5.33

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Page 90
Events for Pond
6P: Sand Filter
Event
Inflow
Outflow
Primary Secondary
Elevation
Storage
(cfs)
(cfs)
(cfs)
(cfs)
(feet)
(acre-feet)
1-inch
2.41
0.05
0.05
0.00
739.52
0.083
1-yr
22.23
4.04
4.04
0.00
741.53
0.470
2-yr
29.74
6.76
6.76
0.00
742.19
0.623
10-yr
50.32
16.00
16.00
0.00
743.75
1.031
25-yr
62.64
25.70
25.65
0.05
744.51
1.255
50-yr
72.53
46.54
39.43
7.11
744.77
1.337
100-yr
82.54
64.52
49.80
14.72
744.93
1.389

Sennebogen - Sand Filter Design
8189-Sand Filter -Detailed Design Multi -Event Tables
Prepared by CES Group Engineers, LLP Printed 3/8/2024
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC Paae 91
Events for Link 12L: Analysis Point 1
Event
Inflow
(cfs)
Primary
(cfs)
Elevation
(feet)
1-inch
0.05
0.05
0.00
1-yr
4.13
4.13
0.00
2-yr
6.91
6.91
0.00
10-yr
16.38
16.38
0.00
25-yr
26.20
26.20
0.00
50-yr
40.52
40.52
0.00
100-yr
51.42
51.42
0.00

8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC
TABLE OF CONTENTS
Project Reports
1
Routing Diagram
2
Rainfall Events Listing
3
Area Listing (all nodes)
4
Soil Listing (all nodes)
5
Ground Covers (all nodes)
6
Pipe Listing (all nodes)
1-inch Event
7 Node Listing
8 Subcat 1 S: Pre-Dev 1
9 Subcat 5S: Post Dev 1A
10 Subcat 7S: Post Dev (Modified CN)
11 Subcat 8S: Pre-Dev 2
12 Subcat 11 S: Post Dev 1 B
13 Subcat 13S: Post-Dev 2
14 Pond 6P: Sand Filter
17 Link 12L: Analysis Point 1
1-yr Event
18 Node Listing
19 Subcat 1 S: Pre-Dev 1
20 Subcat 5S: Post Dev 1A
21 Subcat 7S: Post Dev (Modified CN)
22 Subcat 8S: Pre-Dev 2
23 Subcat 11 S: Post Dev 1 B
24 Subcat 13S: Post-Dev 2
25 Pond 6P: Sand Filter
28 Link 12L: Analysis Point 1
2-yr Event
29 Node Listing
30 Subcat 1 S: Pre-Dev 1
31 Subcat 5S: Post Dev 1A
32 Subcat 7S: Post Dev (Modified CN)
33 Subcat 8S: Pre-Dev 2
34 Subcat 11 S: Post Dev 1 B
35 Subcat 13S: Post-Dev 2
36 Pond 6P: Sand Filter
39 Link 12L: Analysis Point 1
10-yr Event
40
Node Listing
41
Subcat 1 S:
Pre-Dev 1
42
Subcat 5S:
Post Dev 1A
43
Subcat 7S:
Post Dev (Modified CN)
44
Subcat 8S:
Pre-Dev 2
45 Subcat 11 S: Post Dev 1 B
46 Subcat 13S: Post-Dev 2
Sennebogen - Sand Filter Design
Table of Contents
Printed 3/8/2024

8189-Sand Filter -Detailed Design
Prepared by CES Group Engineers, LLP
HvdroCAD® 10.20-4b s/n 10182 © 2023 HvdroCAD Software Solutions LLC
47 Pond 6P: Sand Filter
50 Link 12L: Analysis Point 1
25-yr Event
51 Node Listing
52 Subcat 1 S: Pre-Dev 1
53 Subcat 5S: Post Dev 1A
54 Subcat 7S: Post Dev (Modified CN)
55 Subcat 8S: Pre-Dev 2
56 Subcat 11 S: Post Dev 1 B
57 Subcat 13S: Post-Dev 2
58 Pond 6P: Sand Filter
61 Link 12L: Analysis Point 1
50-yr Event
62 Node Listing
63 Subcat 1 S: Pre-Dev 1
64 Subcat 5S: Post Dev 1A
65 Subcat 7S: Post Dev (Modified CN)
66 Subcat 8S: Pre-Dev 2
67 Subcat 11 S: Post Dev 1 B
68 Subcat 13S: Post-Dev 2
69 Pond 6P: Sand Filter
72 Link 12L: Analysis Point 1
100-yr Event
73 Node Listing
74 Subcat 1 S: Pre-Dev 1
75 Subcat 5S: Post Dev 1A
76 Subcat 7S: Post Dev (Modified CN)
77 Subcat 8S: Pre-Dev 2
78 Subcat 11 S: Post Dev 1 B
79 Subcat 13S: Post-Dev 2
80 Pond 6P: Sand Filter
83 Link 12L: Analysis Point 1
Multi -Event Tables
84 Subcat 1 S: Pre-Dev 1
85 Subcat 5S: Post Dev 1A
86 Subcat 7S: Post Dev (Modified CN)
87 Subcat 8S: Pre-Dev 2
88 Subcat 11 S: Post Dev 1 B
89 Subcat 13S: Post-Dev 2
90 Pond 6P: Sand Filter
91 Link 12L: Analysis Point 1
Sennebogen - Sand Filter Design
Table of Contents
Printed 3/8/2024

Exhibit 5
Soil Maps

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Soil Map —Lincoln County, North Carolina
Post Dev DA
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
CeB2
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79.9%
percent slopes, moderately
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15 percent slopes,
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WyC
Wynott-Winnsboro-Rowan
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complex, 8 to 15 percent
slopes
Totals for Area of Interest
8.9
100.0%
k;sim Natural Resources Web Soil Survey 11/2/2023
Conservation Service National Cooperative Soil Survey Page 3 of 3

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Hydrologic Soil Group —Lincoln County, North Carolina
HSG Map
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CeB2
Cecil sandy clay loam, 2
B
7.1
79.9%
to 8 percent slopes,
moderately eroded
PeC2
Pacolet sandy clay
B
0.0
0.0%
loam, 8 to 15 percent
slopes, moderately
eroded
WyC
Wynott-Winnsboro-
D
1.8
20.1 %
Rowan complex, 8 to
15 percent slopes
Totals for Area of Interest
8.9
100.0%
k;sim Natural Resources Web Soil Survey 11/2/2023
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group —Lincoln County, North Carolina
HSG Map
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
k;sim Natural Resources Web Soil Survey 11/2/2023
Conservation Service National Cooperative Soil Survey Page 4 of 4