Makson - STORMWATER_CALCS_WET_POND_REVISED

BREC

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BREC, P.A. Makson, Inc. | Stormwater Calculations 2
1.0 General Information

This document contains stormwater calculations demonstrating compliance with
post-construction state and local stormwater regulations for the construction of
an office and warehouse for Makson, Inc. off Speedway Boulevard in Salisbury,
NC. Specifically, regulations for this area require water quality treatment of the
first flush ሺ1"ሻ storm and the attenuation of the 1 year, 24 hour storm to pre-
construction discharge rates. Larger storms are also required to pass the
system. Two wet detention ponds will be utilized to meet these requirements.
2.0 Methodology

Site topography requires the use of two BMPs to treat the proposed built upon
areas. The water quality volume ሺܹܳ௩ ሻ required to be treated from the first flush
was calculated using the Schueler method outlined in the NCDENR Stormwater
BMP Manual. The Schueler method utilizes the following equations:

ܴ௩ ൌ 0.05 ൅ 0.9ܫ஺
ܹܸܳ ൌ 3630ܴ஽ ܴ௩ ܣ

Where ܫ஺ is the impervious fraction of the drainage area, ܴ௩ is a runoff coefficient,
ܴ஽ is the rainfall depth, ܣ is the drainage area, and ܹܳ௩ is the runoff volume.
The calculated ܹܳ௩ is 8,854 ݂ݐ ଷ for Wet Pond #1 and 2,100 ݂ݐ ଷ for Wet Pond
#2. To route the ܹܳ௩ through the wet ponds, it is necessary to calculate a
modified SCS curve number to avoid underrepresenting the first flush. The
modified curve number is calculated as follows:

ܥܰ௠ ൌ 1000/ቂ10 ൅ 5ܴ஽ ൅ 10ܹܳ௩ െ10ඥܹܳ௩ଶ ൅ 1.25ܹܳ௩ ܴ஽ ቃ

The modified curve numbers were used to route the first flush using an SCS 6
hour balanced storm distribution. The 1 year, 24 hour and larger storms were
routed with standard curve numbers and an SCS type II 24 hour storm
distribution.

Two pre-construction drainage areas and eleven post-construction drainage
areas were identified.

Table 1 - Pre-Construction Drainage Area(s)
ࡺࢇ࢓ࢋ ࡭࢘ࢋࢇ ሺࢇࢉ࢘ࢋ࢙ሻ ࡯ࡺ ࡯ࡺ࢓ ࢀࢉ ሺ࢓࢏࢔࢛࢚ࢋ࢙ሻ
PRE-CONSTRUCTION:1 6.97 56.0 N/A 30
PRE-CONSTRUCTION:2 1.46 55.7 N/A 10

BREC, P.A. Makson, Inc. | Stormwater Calculations 3
Table 2 - Post-Construction Drainage Areas for Upper Wet Pond
ࡺࢇ࢓ࢋ ࡭࢘ࢋࢇ
ሺࢇࢉሻ
࡯ࡺ ࡯ࡺ࢓ ࢀࢉ
ሺ࢓࢏࢔ሻ
ࡾ࢜ ࢃࡽࢂ
ሺࢌ࢚૜ ሻ
POST-CONSTRUCTION:1 0.83 87.22 96.77 5 0.69 2061
POST-CONSTRUCTION:8* 0.69 56.00 77.22 5 0.05 126
POST-CONSTRUCTION:11 0.22 61.00 77.22 5 0.05 39
TOTAL 2100

Table 3 - Post-Construction Drainage Areas for Lower Wet Pond
ࡺࢇ࢓ࢋ ࡭࢘ࢋࢇ
ሺࢇࢉሻ
࡯ࡺ ࡯ࡺ࢓ ࢀࢉ
ሺ࢓࢏࢔ሻ
ࡾ࢜ ࢃࡽࢂ
ሺࢌ࢚૜ ሻ
POST-CONSTRUCTION:2 0.24 98.00 99.57 5 0.95 835
POST-CONSTRUCTION:3 0.83 93.18 98.45 5 0.83 2520
POST-CONSTRUCTION:4 0.09 61.00 77.22 5 0.05 17
POST-CONSTRUCTION:5 0.35 87.76 96.94 5 0.70 880
POST-CONSTRUCTION:6 0.22 96.92 99.33 5 0.92 733
POST-CONSTRUCTION:7 0.70 98.00 99.57 5 0.95 2417
POST-CONSTRUCTION:7A 0.37 98.00 99.57 5 0.95 1261
POST-CONSTRUCTION:9 1.05 60.22 77.22 5 0.05 191
POST-CONSTRUCTION:10* 3.73 56.17 77.22 25 0.05 677
TOTAL 8854

*Drainage areas POST-CONSTRUCTION:8 and POST-CONSTRUCTION:10
consist of vegetated areas on the down slope side of the stormwater BMPs;
therefore, they are not routed through the BMPs; however, runoff from these
drainage areas are included in the peak attenuation calculations.

Routing of the required storms through the sand filters was performed using
Autodesk Storm and Sanitary Analysis (SSA) 2015.

2.1 Wet Pond Calculations

Both wet ponds were sized using the hydraulic retention time method described
by the following equation in the NCDEQ Stormwater Design Manual.

ܸ௠௣ ൌ0.87൬ܪܴܶ
ܶ௦
൰ ܦܸ
ܸ௠௣ ൌ ܯܽ݅݊ ݌݋݋݈ ݒ݋݈ݑ݉݁
ሺ݂ݐଷሻ
ܪܴܶ ൌ ܴ݁ݍݑ݅ݎ݁݀ ݄ݕ݀ݎܽݑ݈݅ܿ ݎ݁ݏ݅݀݁݊ܿ݁ ݐ݅݉݁
ሺ14 ݀ܽݕݏሻ
ܶ௦ ൌ ܣݒ݁ݎܽ݃݁ ݐ݅݉݁ ܾ݁ݐݓ݁݁݊ ݏݐ݋ݎ݉ ݁ݒ݁݊ݐݏ
ሺ5 ݀ܽݕݏሻ
ܦܸ ൌ ܦ݁ݏ݅݃݊ ݒ݋݈ݑ݉݁
ሺ݂ݐଷ ሻ

BREC, P.A. Makson, Inc. | Stormwater Calculations 4
2.1.1 Wet Pond #1 (Lower)

Wet pond #1 has a design volume of 8,854 ݂ݐ ଷ which yields the following
minimum volume for the main pool.

ܸ௠௣ ൌ0.87൬14
5 ൰ 8,854 ൌ 21,568 ݂ݐ
ଷ

In order to meet peak flow attenuation requirements, the volume provided in the
main pool is larger than the minimum requirements.

ܸ௠௣೛ೝ೚ೡ೔೏೐೏ ൌ 52,803 ݂ݐ
ଷ

The required forebay volume ranges from 15% to 20% of ܸ௠௣೛ೝ೚ೡ೔೏೐೏ .

7,920 ݂ݐ ଷ ൑ܸ௙௕ ൑ 10,560 ݂ݐ
ଷ

ܸ௙௕೛ೝ೚ೡ೔೏೐೏ ൌ 8,260 ݂ݐ
ଷ

The geometry of the pond is guided by topographic constraints and yields a main
pool surface area of:

ܣ௠௣ ൌ 9,717 ݂ݐ
ଶ

The average depth is calculated as:

ܦ௔௩௚ ൌቆܸ௠௣೛ೝ೚ೡ೔೏೐೏
ܣ௠௣
ቇൌ52,803
9,717 ൌ 5.43 ݂ݐ

The temporary pool is designed for a 1 ݂ݐ depth which provides a water quality
storage volume of 14,441 ݂ݐ ଷ which exceeds the design volume of 8,854 ݂ݐ ଷ.

Drawdown of the temporary pool is controlled by a 2 ݅݊ orifice which discharges
according to the orifice equation.

ܳ௧௠௣ି௣௢௢௟ ൌܥܣඥ2݄݃
ܥ ൌ 0.614
ܣ ൌ 0.022 ݂ݐ
ଶ
݄ൌݒܽݎ݅݁ݏ ݓ݅ݐ݄ ݀݁݌ݐ݄

BREC, P.A. Makson, Inc. | Stormwater Calculations 5

2.1.1 Wet Pond #2 (Upper)

Wet pond #2 has a design volume of 2,100 ݂ݐ ଷ which yields the following
minimum volume for the main pool.

ܸ௠௣ ൌ0.87൬14
5 ൰ 2,100 ൌ 5,116 ݂ݐ
ଷ

In order to meet peak flow attenuation requirements, the volume provided in the
main pool is larger than the minimum requirements.

ܸ௠௣೛ೝ೚ೡ೔೏೐೏ ൌ 10,209 ݂ݐ
ଷ

The required forebay volume ranges from 15% to 20% of ܸ௠௣೛ೝ೚ೡ೔೏೐೏ .

1,531 ݂ݐ ଷ ൑ܸ௙௕ ൑ 2,042 ݂ݐ
ଷ

ܸ௙௕೛ೝ೚ೡ೔೏೐೏ ൌ 1,676 ݂ݐ
ଷ

The geometry of the pond is guided by topographic constraints and yields a main
pool surface area of:

ܣ௠௣ ൌ 3,327 ݂ݐ
ଶ

The average depth is calculated as:

ܦ௔௩௚ ൌቆܸ௠௣೛ೝ೚ೡ೔೏೐೏
ܣ௠௣
ቇൌ10,209
3,327 ൌ 3.07 ݂ݐ

The temporary pool is designed for a 1 ݂ݐ depth which provides a water quality
storage volume of 5,335 ݂ݐ ଷ which exceeds the design volume of 2,100 ݂ݐ ଷ .

Drawdown of the temporary pool is controlled by a 1 ݅݊ orifice which discharges
according to the orifice equation.

ܳ௧௠௣ି௣௢௢௟ ൌܥܣඥ2݄݃
ܥ ൌ 0.614
ܣ ൌ 0.005 ݂ݐ
ଶ
݄ൌݒܽݎ݅݁ݏ ݓ݅ݐ݄ ݀݁݌ݐ݄

BREC, P.A. Makson, Inc. | Stormwater Calculations 6
3.0 Results

The pre- and post-construction peak runoff rates at each pre-construction outfall
are summarized below for the storms requiring peak attenuation.

Table 4 - Peak Runoff Rates for PRE-CONSTRUCTION:1 (Lower)
ࡿࢀࡻࡾࡹ ࡼࡾࡱ െ ࡯ࡻࡺ ቆ
ࢌ࢚૜
࢙ ቇ ࡼࡻࡿࢀ െ ࡯ࡻࡺ ቆ
ࢌ࢚૜
࢙ ቇ
1 year, 24 hour 0.25 0.25

Table 5 - Peak Runoff Rates for PRE-CONSTRUCTION:2 (Upper)
ࡿࢀࡻࡾࡹ ࡼࡾࡱ െ ࡯ࡻࡺ ቆ
ࢌ࢚૜
࢙ ቇ ࡼࡻࡿࢀ െ ࡯ࡻࡺ ቆ
ࢌ࢚૜
࢙ ቇ
1 year, 24 hour 0.08 0.08

Drawdown times for each pond are summarized below.

Table 6 - BMP Draw Down Times for Water Quality Volume
BMP DRAW DOWN TIME ሺࢎ࢙࢘ሻ
Wet Pond #1 (Lower) 72
Wet Pond #2 (Upper) 96

Plots for each BMP draw down are provided in the Appendix.

The peak 10 ݕ݁ܽݎ,24 ݄݋ݑݎ discharge for each BMP is summarized below.

Table 7 - BMP Peak 10 Year Discharge
BMP PEAK 10 YEAR DISCHARGE ቀࢌ࢚૜
௦ ቁ
Wet Pond #1 (Lower) 7.59
Wet Pond #2 (Upper) 1.12

The outlet swales for each BMP are trapezoidal channels with a 1% longitudinal
slope and 3:1 side slopes. Manning’s equation with a range of bottom widths
and a coefficient of 0.035 (Curlex II liner) was solved to arrive at an acceptable
outlet velocity for each BMP channel. See plansheets for details.

BREC, P.A. Makson, Inc. | Stormwater Calculations 7
Table 8 - BMP Peak 10 Year Outlet Velocity
BMP OUTLET BOTTOM WIDTH
ሺࢌ࢚ሻ
PEAK VELOCITY
ቀࢌ࢚
࢙ ቁ
Wet Pond #1 (Lower) 3 2.60
Wet Pond #2 (Upper) 21.53

BREC, P.A. Makson, Inc. | Stormwater Calculations 8
Appendix

BREC, P.A. Makson, Inc. | Stormwater Calculations 9
Pre‐construction Routing

BREC, P.A. Makson, Inc. | Stormwater Calculations 10
1 year, 24 hour Routing

Project Description
PRE-CON-ROUTING.SPF
Project Options
CFS
Elevation
SCS TR-55
User-Defined
Hydrodynamic
YES
YES
Analysis Options
Nov 28, 2017 00:00:00
Nov 30, 2017 00:00:00
Nov 28, 2017 00:00:00
0 days
0 01:00:00 days hh:mm:ss
0 00:05:00 days hh:mm:ss
0 00:00:15 days hh:mm:ss
15 seconds
Number of Elements
Qty
1
2
2
0
2
0
0
0
0
0
0
0
0
0
0
0
0
Rainfall Details
SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall
ID Source ID Type Units Period Depth Distribution
(years)(inches)
1 SALISBURY Time Series 1YR-24HR Cumulative inches North Carolina Rowan 1 2.75 SCS Type II 24-hr
Orifices ...................................................
Weirs ......................................................
Outlets ...................................................
Pollutants ........................................................
Land Uses ......................................................
Inlets ......................................................
Storage Nodes .......................................
Links................................................................
Channels ................................................
Pipes ......................................................
Pumps ....................................................
Rain Gages ....................................................
Subbasins........................................................
Nodes..............................................................
Junctions ................................................
Outfalls ...................................................
Flow Diversions .....................................
Start Reporting On .........................................
Antecedent Dry Days ......................................
Runoff (Dry Weather) Time Step ...................
Runoff (Wet Weather) Time Step ..................
Reporting Time Step ......................................
Routing Time Step ..........................................
Time of Concentration (TOC) Method ............
Link Routing Method ......................................
Enable Overflow Ponding at Nodes ...............
Skip Steady State Analysis Time Periods ......
Start Analysis On ............................................
End Analysis On .............................................
File Name .......................................................
Description .....................................................Z:\CURRENT_PROJECTS\310_SCOTT_MITCHELL\3100042017_MAKSON_HEADQUARTERS\PRODUCTION_DW
GS\3100042017_C100-STORMWATER.dwg
Flow Units .......................................................
Elevation Type ................................................
Hydrology Method ..........................................
Subbasin Summary
SN Subbasin Area Weighted Total Total Total Peak Time of
ID Curve Rainfall Runoff Runoff Runoff Concentration
Number Volume
(ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss)
1 {PRE-CONSTRUCTION}.PRE-CONSTRUCTION : 1 6.97 56.00 2.75 0.15 1.07 0.25 0 00:30:00
2 {PRE-CONSTRUCTION}.PRE-CONSTRUCTION : 2 1.46 55.70 2.75 0.15 0.21 0.08 0 00:10:00
Node Summary
SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total Total Time
ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded Flooded
Elevation Elevation Attained Depth Attained Flooding Volume
Attained Occurrence
(ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)(min)
1 DOWNSTREAM Outfall 764.00 0.00 0.00
2 UPSTREAM Outfall 774.00 0.00 0.00
Subbasin Hydrology
Subbasin : {PRE-CONSTRUCTION}.PRE-CONSTRUCTION : 1
Input Data
Area (ac) .....................................................6.97
Weighted Curve Number ............................56.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-6.97 -56.00
Composite Area & Weighted CN 6.97 56.00
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................0.15
Peak Runoff (cfs) ........................................0.25
Weighted Curve Number ............................56.00
Time of Concentration (days hh:mm:ss) .....0 00:30:00
Subbasin : {PRE-CONSTRUCTION}.PRE-CONSTRUCTION : 1
Subbasin : {PRE-CONSTRUCTION}.PRE-CONSTRUCTION : 2
Input Data
Area (ac) .....................................................1.46
Weighted Curve Number ............................55.70
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-1.46 -55.70
Composite Area & Weighted CN 1.46 55.70
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................0.15
Peak Runoff (cfs) ........................................0.08
Weighted Curve Number ............................55.70
Time of Concentration (days hh:mm:ss) .....0 00:10:00
Subbasin : {PRE-CONSTRUCTION}.PRE-CONSTRUCTION : 2

BREC, P.A. Makson, Inc. | Stormwater Calculations 11
Post‐construction Routing

BREC, P.A. Makson, Inc. | Stormwater Calculations 12
First Flush (1”)

Project Description
POST-CON-ROUTING-EXPANSION-BALANCED-WET-POND_04162018.SPF
Project Options
CFS
Elevation
SCS TR-55
User-Defined
Hydrodynamic
YES
YES
Analysis Options
Nov 28, 2017 00:00:00
Dec 03, 2017 00:00:00
Nov 28, 2017 00:00:00
0 days
0 01:00:00 days hh:mm:ss
0 00:05:00 days hh:mm:ss
0 00:00:15 days hh:mm:ss
15 seconds
Number of Elements
Qty
1
12
12
4
2
0
4
2
14
0
8
0
4
2
0
0
0
Rainfall Details
SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall
ID Source ID Type Units Period Depth Distribution
(years)(inches)
1 SALISBURY Time Series 1IN-6HR-BALANCED Cumulative inches 0.00
Orifices .................................................................
Weirs ....................................................................
Outlets ..................................................................
Pollutants ......................................................................
Land Uses .....................................................................
Inlets .....................................................................
Storage Nodes .....................................................
Links..............................................................................
Channels ..............................................................
Pipes ....................................................................
Pumps ..................................................................
Rain Gages ...................................................................
Subbasins......................................................................
Nodes............................................................................
Junctions ..............................................................
Outfalls .................................................................
Flow Diversions ....................................................
Start Reporting On ........................................................
Antecedent Dry Days ....................................................
Runoff (Dry Weather) Time Step ..................................
Runoff (Wet Weather) Time Step .................................
Reporting Time Step .....................................................
Routing Time Step ........................................................
Time of Concentration (TOC) Method ..........................
Link Routing Method .....................................................
Enable Overflow Ponding at Nodes ..............................
Skip Steady State Analysis Time Periods .....................
Start Analysis On ..........................................................
End Analysis On ...........................................................
File Name .....................................................................
Description ....................................................................Z:\CURRENT_PROJECTS\310_SCOTT_MITCHELL\3100042017_MAKSON_HEADQUARTERS\PRO
DUCTION_DWGS\3100042017_C100-STORMWATER.dwg
Flow Units .....................................................................
Elevation Type ..............................................................
Hydrology Method .........................................................
Subbasin Summary
SN Subbasin Area Weighted Total Total Total Peak Time of
ID Curve Rainfall Runoff Runoff Runoff Concentration
Number Volume
(ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss)
1 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1 0.82 96.77 1.00 0.69 0.56 1.42 0 00:05:00
2 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10 3.74 77.22 1.00 0.05 0.18 0.12 0 00:25:00
3 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2 0.24 99.57 1.00 0.95 0.23 0.51 0 00:05:00
4 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3 0.83 98.45 1.00 0.83 0.69 1.64 0 00:05:00
5 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4 0.09 77.22 1.00 0.05 0.00 0.00 0 00:05:00
6 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5 0.35 96.94 1.00 0.70 0.24 0.60 0 00:05:00
7 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6 0.22 96.92 1.00 0.70 0.15 0.38 0 00:05:00
8 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7 0.70 99.57 1.00 0.95 0.66 1.45 0 00:05:00
9 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8 0.69 77.22 1.00 0.05 0.03 0.03 0 00:05:00
10 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9 1.05 77.22 1.00 0.05 0.05 0.05 0 00:05:00
11 POST-CONSTRUCTION : 11 0.22 77.22 1.00 0.05 0.01 0.01 0 00:05:00
12 POST-CONSTRUCTION : 7A 0.37 99.57 1.00 0.95 0.35 0.77 0 00:05:00
Node Summary
SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total
ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded
Elevation Elevation Attained Depth Attained Flooding Volume
Attained Occurrence
(ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)
1 BMP-RISER-DOWN Junction 773.50 780.00 773.50 0.00 0.00 0.08 773.58 0.00 8.59 0 00:00 0.00
2 BMP-RISER-UP Junction 775.50 782.00 775.50 0.00 0.00 0.02 775.54 0.00 6.46 0 00:00 0.00
3 SITE-OUTLET-JUNCTION-DOWN Junction 773.00 780.00 773.00 0.00 0.00 0.19 773.07 0.00 10.93 0 00:00 0.00
4 SITE-OUTLET-JUNCTION-UP Junction 775.25 782.00 775.25 0.00 0.00 0.04 775.31 0.00 7.94 0 00:00 0.00
5 DOWNSTREAM Outfall 764.00 0.19 764.07
6 UPSTREAM Outfall 775.00 0.04 775.05
7 WET-POND-DOWN Storage Node 769.00 780.00 777.50 0.00 5.34 778.09 0.00
8 WET-POND-UP Storage Node 774.00 782.00 779.50 0.00 1.42 779.90 0.00
Link Summary
SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow Peak Flow Total Time
ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Velocity Depth Surcharged
Node Elevation Elevation
(ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft)(min)
1 BMP-BARREL-DOWN Pipe BMP-RISER-DOWN SITE-OUTLET-JUNCTION-DOWN 20.00 773.50 773.00 2.5000 18.000 0.0120 0.08 17.99 3.05 0.07 0.00
2 BMP-BARREL-UP Pipe BMP-RISER-UP SITE-OUTLET-JUNCTION-UP 20.00 775.50 775.25 1.2500 18.000 0.0120 0.02 12.72 1.37 0.05 0.00
3 PIPE - 1 Pipe YARD INLET - 2 DROP INLET - 1 92.75 784.50 784.00 0.5400 15.000 0.0120 0.00 5.14 0.81 0.11 0.00
4 PIPE - 2 Pipe YARD INLET - 1 DROP INLET - 1 41.71 784.50 784.00 1.2000 15.000 0.0120 0.60 7.66 3.45 0.25 0.00
5 PIPE - 3 Pipe DROP INLET - 1 CURB INLET - 1 242.58 783.90 781.40 1.0300 15.000 0.0120 0.97 7.10 2.42 0.46 0.00
6 PIPE - 4 Pipe CURB INLET - 1 WET-POND-DOWN 138.42 781.30 780.50 0.5800 24.000 0.0120 4.08 18.63 4.43 0.67 0.00
7 SITE-OUTLET-LINK-DOWN Pipe SITE-OUTLET-JUNCTION-DOWN DOWNSTREAM 100.00 773.00 764.00 9.0000 36.000 0.0120 0.19 216.77 4.66 0.07 0.00
8 SITE-OUTLET-LINK-UP Pipe SITE-OUTLET-JUNCTION-UP UPSTREAM 20.00 775.25 775.00 1.2500 36.000 0.0120 0.04 80.79 1.47 0.06 0.00
9 PRINCIPAL-SPILLWAY-DOWN Orifice WET-POND-DOWN BMP-RISER-DOWN 769.00 773.50 2.000 0.08
10 PRINCIPAL-SPILLWAY-UP Orifice WET-POND-UP BMP-RISER-UP 774.00 775.50 1.000 0.02
11 SECONDARY-OUTLET-DOWN Orifice WET-POND-DOWN BMP-RISER-DOWN 769.00 773.50 36.000 0.00
12 SECONDARY-OUTLET-UP Orifice WET-POND-UP BMP-RISER-UP 774.00 775.50 36.000 0.00
13 EMERGENCY-SPILLWAY-DOWN Weir WET-POND-DOWN SITE-OUTLET-JUNCTION-DOWN 769.00 773.00 0.00
14 EMERGENCY-SPILLWAY-UP Weir WET-POND-UP SITE-OUTLET-JUNCTION-UP 774.00 775.25 0.00
Inlet Summary
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Initial Ponded Peak Peak Flow Peak Flow Inlet Allowable Max Gutter Max Gutter
ID Manufacturer Part Location Inlets Invert Elevation Water Area Flow Intercepted Bypassing Efficiency Spread Spread Water Elev.
Number Elevation Elevation by Inlet during Peak during Peak during Peak
Inlet Flow Flow Flow
(ft)(ft)(ft)(ft²)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)
1 CURB INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 781.30 787.50 781.30 10.00 3.09 N/A N/A N/A 7.00 5.56 788.70
2 DROP INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 783.90 789.50 783.90 10.00 0.38 N/A N/A N/A 7.00 1.28 789.57
3 YARD INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 787.50 784.50 10.00 0.60 N/A N/A N/A 7.00 2.04 787.62
4 YARD INLET - 2 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 788.50 784.50 10.00 0.00 N/A N/A N/A 7.00 0.01 788.50
Subbasin Hydrology
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1
Input Data
Area (ac) .....................................................0.82
Weighted Curve Number ............................96.77
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.82 -96.77
Composite Area & Weighted CN 0.82 96.77
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.69
Peak Runoff (cfs) ........................................1.42
Weighted Curve Number ............................96.77
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10
Input Data
Area (ac) .....................................................3.74
Weighted Curve Number ............................77.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-3.74 -77.22
Composite Area & Weighted CN 3.74 77.22
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.05
Peak Runoff (cfs) ........................................0.12
Weighted Curve Number ............................77.22
Time of Concentration (days hh:mm:ss) .....0 00:25:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2
Input Data
Area (ac) .....................................................0.24
Weighted Curve Number ............................99.57
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.24 -99.57
Composite Area & Weighted CN 0.24 99.57
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.95
Peak Runoff (cfs) ........................................0.51
Weighted Curve Number ............................99.57
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3
Input Data
Area (ac) .....................................................0.83
Weighted Curve Number ............................98.45
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.83 -98.45
Composite Area & Weighted CN 0.83 98.45
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.83
Peak Runoff (cfs) ........................................1.64
Weighted Curve Number ............................98.45
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4
Input Data
Area (ac) .....................................................0.09
Weighted Curve Number ............................77.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.09 -77.22
Composite Area & Weighted CN 0.09 77.22
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.05
Peak Runoff (cfs) ........................................0.00
Weighted Curve Number ............................77.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5
Input Data
Area (ac) .....................................................0.35
Weighted Curve Number ............................96.94
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.35 -96.94
Composite Area & Weighted CN 0.35 96.94
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.70
Peak Runoff (cfs) ........................................0.60
Weighted Curve Number ............................96.94
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6
Input Data
Area (ac) .....................................................0.22
Weighted Curve Number ............................96.92
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.22 -96.92
Composite Area & Weighted CN 0.22 96.92
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.70
Peak Runoff (cfs) ........................................0.38
Weighted Curve Number ............................96.92
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7
Input Data
Area (ac) .....................................................0.70
Weighted Curve Number ............................99.57
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.70 -99.57
Composite Area & Weighted CN 0.70 99.57
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.95
Peak Runoff (cfs) ........................................1.45
Weighted Curve Number ............................99.57
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8
Input Data
Area (ac) .....................................................0.69
Weighted Curve Number ............................77.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.69 -77.22
Composite Area & Weighted CN 0.69 77.22
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.05
Peak Runoff (cfs) ........................................0.03
Weighted Curve Number ............................77.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9
Input Data
Area (ac) .....................................................1.05
Weighted Curve Number ............................77.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-1.05 -77.22
Composite Area & Weighted CN 1.05 77.22
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.05
Peak Runoff (cfs) ........................................0.05
Weighted Curve Number ............................77.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9
Subbasin : POST-CONSTRUCTION : 11
Input Data
Area (ac) .....................................................0.22
Weighted Curve Number ............................77.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.22 -77.22
Composite Area & Weighted CN 0.22 77.22
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.05
Peak Runoff (cfs) ........................................0.01
Weighted Curve Number ............................77.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : POST-CONSTRUCTION : 11
Subbasin : POST-CONSTRUCTION : 7A
Input Data
Area (ac) .....................................................0.37
Weighted Curve Number ............................99.57
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.35 -99.57
Composite Area & Weighted CN 0.35 99.57
Subbasin Runoff Results
Total Rainfall (in) .........................................1.00
Total Runoff (in) ..........................................0.95
Peak Runoff (cfs) ........................................0.77
Weighted Curve Number ............................99.57
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : POST-CONSTRUCTION : 7A
Junction Input
SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum
ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe
Elevation Offset Elevation Depth Cover
(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in)
1 BMP-RISER-DOWN 773.50 780.00 6.50 773.50 0.00 0.00 -780.00 0.00 0.00
2 BMP-RISER-UP 775.50 782.00 6.50 775.50 0.00 0.00 -782.00 0.00 0.00
3 SITE-OUTLET-JUNCTION-DOWN 773.00 780.00 7.00 773.00 0.00 0.00 -780.00 0.00 0.00
4 SITE-OUTLET-JUNCTION-UP 775.25 782.00 6.75 775.25 0.00 0.00 -782.00 0.00 0.00
Junction Results
SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time
ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded
Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume
Attained Occurrence
(cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min)
1 BMP-RISER-DOWN 0.08 0.00 773.58 0.08 0.00 8.59 773.53 0.03 0 06:45 0 00:00 0.00 0.00
2 BMP-RISER-UP 0.02 0.00 775.54 0.04 0.00 6.46 775.52 0.02 0 06:09 0 00:00 0.00 0.00
3 SITE-OUTLET-JUNCTION-DOWN 0.19 0.12 773.07 0.07 0.00 10.93 773.02 0.02 0 03:35 0 00:00 0.00 0.00
4 SITE-OUTLET-JUNCTION-UP 0.04 0.03 775.31 0.06 0.00 7.94 775.26 0.01 0 03:17 0 00:00 0.00 0.00
Pipe Input
SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial
ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow
Elevation Offset Elevation Offset Height
(ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs)
1 BMP-BARREL-DOWN 20.00 773.50 0.00 773.00 0.00 0.50 2.5000 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00
2 BMP-BARREL-UP 20.00 775.50 0.00 775.25 0.00 0.25 1.2500 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00
3 PIPE - 1 92.75 784.50 0.00 784.00 0.10 0.50 0.5400 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
4 PIPE - 2 41.71 784.50 0.00 784.00 0.10 0.50 1.2000 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
5 PIPE - 3 242.58 783.90 0.00 781.40 0.10 2.50 1.0300 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
6 PIPE - 4 138.42 781.30 0.00 780.50 11.50 0.80 0.5800 CIRCULAR 24.000 24.000 0.0120 0.5000 0.5000 0.0000 0.00
7 SITE-OUTLET-LINK-DOWN 100.00 773.00 0.00 764.00 0.00 9.00 9.0000 CIRCULAR 36.000 36.000 0.0120 0.5000 0.5000 0.0000 0.00
8 SITE-OUTLET-LINK-UP 20.00 775.25 0.00 775.00 0.00 0.25 1.2500 CIRCULAR 36.000 36.000 0.0120 0.5000 0.5000 0.0000 0.00
Pipe Results
SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported
ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Condition
Occurrence Ratio Total Depth
Ratio
(cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min)
1 BMP-BARREL-DOWN 0.08 0 06:05 17.99 0.00 3.05 0.11 0.07 0.05 0.00 Calculated
2 BMP-BARREL-UP 0.02 0 06:01 12.72 0.00 1.37 0.24 0.05 0.03 0.00 Calculated
3 PIPE - 1 0.00 0 03:22 5.14 0.00 0.81 1.91 0.11 0.08 0.00 Calculated
4 PIPE - 2 0.60 0 03:06 7.66 0.08 3.45 0.20 0.25 0.20 0.00 Calculated
5 PIPE - 3 0.97 0 03:06 7.10 0.14 2.42 1.67 0.46 0.37 0.00 Calculated
6 PIPE - 4 4.08 0 03:07 18.63 0.22 4.43 0.52 0.67 0.34 0.00 Calculated
7 SITE-OUTLET-LINK-DOWN 0.19 0 03:35 216.77 0.00 4.66 0.36 0.07 0.02 0.00 Calculated
8 SITE-OUTLET-LINK-UP 0.04 0 03:17 80.79 0.00 1.47 0.23 0.06 0.02 0.00 Calculated
Inlet Input
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Inlet Initial Initial Ponded Grate
ID Manufacturer Part Location Inlets Invert Elevation Depth Water Water Area Clogging
Number Elevation Elevation Depth Factor
(ft)(ft)(ft)(ft)(ft)(ft²)(%)
1 CURB INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 781.30 787.50 6.20 781.30 0.00 10.00 0.00
2 DROP INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 783.90 789.50 5.60 783.90 0.00 10.00 0.00
3 YARD INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 787.50 3.00 784.50 0.00 10.00 0.00
4 YARD INLET - 2 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 788.50 4.00 784.50 0.00 10.00 0.00
Roadway & Gutter Input
SN Element Roadway Roadway Roadway Gutter Gutter Gutter Allowable
ID Longitudinal Cross Manning's Cross Width Depression Spread
Slope Slope Roughness Slope
(ft/ft)(ft/ft)(ft/ft)(ft)(in)(ft)
1 CURB INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
2 DROP INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
3 YARD INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
4 YARD INLET - 2 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
Inlet Results
SN Element Peak Peak Peak Flow Peak Flow Inlet Max Gutter Max Gutter Max Gutter Time of Total Total Time
ID Flow Lateral Intercepted Bypassing Efficiency Spread Water Elev.Water Depth Max Depth Flooded Flooded
Inflow by Inlet during Peak during Peak during Peak during Peak Occurrence Volume
Inlet Flow Flow Flow Flow
(cfs)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)(days hh:mm)(ac-in)(min)
1 CURB INLET - 1 3.09 3.09 N/A N/A N/A 5.56 788.70 1.20 0 03:07 0.00 0.00
2 DROP INLET - 1 0.38 0.38 N/A N/A N/A 1.28 789.57 0.07 0 03:06 0.00 0.00
3 YARD INLET - 1 0.60 0.60 N/A N/A N/A 2.04 787.62 0.12 0 03:06 0.00 0.00
4 YARD INLET - 2 0.00 0.00 N/A N/A N/A 0.01 788.50 0.00 0 03:22 0.00 0.00
Storage Nodes
Storage Node : WET-POND-DOWN
Input Data
769.00
780.00
11.00
777.50
8.50
0.00
0.00
Storage Area Volume Curves
Storage Curve : WET-POND-DOWN
Stage Storage Storage
Area Volume
(ft)(ft²)(ft³)
0 3461 0.000
1 4011 3736.00
2 4596 8039.50
3 5214 12944.50
4 5867 18485.00
5 6535 24686.00
6 7229 31568.00
7 7948 39156.50
8 8692 47476.50
8.5 12614 52803.00
9 14795 59655.25
9.5 15559 67243.75
10 16337 75217.75
11 17935 92353.75
Evaporation Loss ......................................................................................................
Invert Elevation (ft) ....................................................................................................
Max (Rim) Elevation (ft) ............................................................................................
Max (Rim) Offset (ft) .................................................................................................
Initial Water Elevation (ft) .........................................................................................
Initial Water Depth (ft) ...............................................................................................
Ponded Area (ft²) ......................................................................................................
Storage Node : WET-POND-DOWN (continued)
Outflow Weirs
SN Element Weir Flap Crest Crest Length Weir Total Discharge
ID Type Gate Elevation Offset Height Coefficient
(ft)(ft)(ft)(ft)
1 EMERGENCY-SPILLWAY-DOWN Trapezoidal No 779.00 10.00 30.00 1.00 3.33
Outflow Orifices
SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice
ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient
Diameter Height Width Elevation
(in)(in)(in)(ft)
1 PRINCIPAL-SPILLWAY-DOWN Side CIRCULAR No 2.00 777.50 0.61
2 SECONDARY-OUTLET-DOWN Bottom Rectangular No 36.00 36.00 778.50 0.63
Output Summary Results
5.34
1.28
0.08
0.00
778.09
9.09
777.64
8.64
0 06:03
0.000
0
0
0.00
Total Time Flooded (min) .........................................................................................
Total Retention Time (sec) .......................................................................................
Max HGL Depth Attained (ft) ....................................................................................
Average HGL Elevation Attained (ft) .........................................................................
Average HGL Depth Attained (ft) ..............................................................................
Time of Max HGL Occurrence (days hh:mm) ..........................................................
Total Exfiltration Volume (1000-ft³) ...........................................................................
Total Flooded Volume (ac-in) ...................................................................................
Peak Inflow (cfs) .......................................................................................................
Peak Lateral Inflow (cfs) ...........................................................................................
Peak Outflow (cfs) ....................................................................................................
Peak Exfiltration Flow Rate (cfm) .............................................................................
Max HGL Elevation Attained (ft) ...............................................................................
Storage Node : WET-POND-UP
Input Data
774.00
782.00
8.00
779.50
5.50
0.00
0.00
Storage Area Volume Curves
Storage Curve : WET-POND-UP
Stage Storage Storage
Area Volume
(ft)(ft²)(ft³)
0 791 0.000
1 1118 954.50
2 1474 2250.50
3 1858 3916.50
4 2270 5980.50
5 2705 8468.00
5.5 4260 10209.25
6 5528 12656.25
6.5 6023 15544.00
7 6553 18688.00
8 7595 25762.00
Initial Water Depth (ft) ...............................................................................................
Ponded Area (ft²) ......................................................................................................
Evaporation Loss ......................................................................................................
Invert Elevation (ft) ....................................................................................................
Max (Rim) Elevation (ft) ............................................................................................
Max (Rim) Offset (ft) .................................................................................................
Initial Water Elevation (ft) .........................................................................................
Storage Node : WET-POND-UP (continued)
Outflow Weirs
SN Element Weir Flap Crest Crest Length Weir Total Discharge
ID Type Gate Elevation Offset Height Coefficient
(ft)(ft)(ft)(ft)
1 EMERGENCY-SPILLWAY-UP Trapezoidal No 781.00 7.00 20.00 1.00 3.33
Outflow Orifices
SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice
ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient
Diameter Height Width Elevation
(in)(in)(in)(ft)
1 PRINCIPAL-SPILLWAY-UP Side CIRCULAR No 1.00 779.50 0.61
2 SECONDARY-OUTLET-UP Bottom Rectangular No 36.00 36.00 780.50 0.63
Output Summary Results
1.42
1.42
0.02
0.00
779.90
5.9
779.60
5.6
0 06:03
0.000
0
0
0.00
Total Exfiltration Volume (1000-ft³) ...........................................................................
Total Flooded Volume (ac-in) ...................................................................................
Total Time Flooded (min) .........................................................................................
Total Retention Time (sec) .......................................................................................
Peak Exfiltration Flow Rate (cfm) .............................................................................
Max HGL Elevation Attained (ft) ...............................................................................
Max HGL Depth Attained (ft) ....................................................................................
Average HGL Elevation Attained (ft) .........................................................................
Average HGL Depth Attained (ft) ..............................................................................
Time of Max HGL Occurrence (days hh:mm) ..........................................................
Peak Inflow (cfs) .......................................................................................................
Peak Lateral Inflow (cfs) ...........................................................................................
Peak Outflow (cfs) ....................................................................................................

BREC, P.A. Makson, Inc. | Stormwater Calculations 13
1 year, 24 hour Routing

Project Description
POST-CON-ROUTING-EXPANSION-WET-POND_04162018.SPF
Project Options
CFS
Elevation
SCS TR-55
User-Defined
Hydrodynamic
YES
YES
Analysis Options
Nov 28, 2017 00:00:00
Dec 01, 2017 00:00:00
Nov 28, 2017 00:00:00
0 days
0 01:00:00 days hh:mm:ss
0 00:05:00 days hh:mm:ss
0 00:00:15 days hh:mm:ss
15 seconds
Number of Elements
Qty
1
12
12
4
2
0
4
2
14
0
8
0
4
2
0
0
0
Rainfall Details
SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall
ID Source ID Type Units Period Depth Distribution
(years)(inches)
1 SALISBURY Time Series 1YR-24HR Cumulative inches North Carolina Rowan 1 2.75 SCS Type II 24-hr
Orifices ...................................................
Weirs ......................................................
Outlets ...................................................
Pollutants ........................................................
Land Uses ......................................................
Inlets ......................................................
Storage Nodes .......................................
Links................................................................
Channels ................................................
Pipes ......................................................
Pumps ....................................................
Rain Gages ....................................................
Subbasins........................................................
Nodes..............................................................
Junctions ................................................
Outfalls ...................................................
Flow Diversions .....................................
Start Reporting On .........................................
Antecedent Dry Days ......................................
Runoff (Dry Weather) Time Step ...................
Runoff (Wet Weather) Time Step ..................
Reporting Time Step ......................................
Routing Time Step ..........................................
Time of Concentration (TOC) Method ............
Link Routing Method ......................................
Enable Overflow Ponding at Nodes ...............
Skip Steady State Analysis Time Periods ......
Start Analysis On ............................................
End Analysis On .............................................
File Name .......................................................
Description .....................................................Z:\CURRENT_PROJECTS\310_SCOTT_MITCHELL\3100042017_MAKSON_HEADQUARTERS\PRODUCTION_DW
GS\3100042017_C100-STORMWATER.dwg
Flow Units .......................................................
Elevation Type ................................................
Hydrology Method ..........................................
Subbasin Summary
SN Subbasin Area Weighted Total Total Total Peak Time of
ID Curve Rainfall Runoff Runoff Runoff Concentration
Number Volume
(ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss)
1 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1 0.82 87.22 2.75 1.54 1.27 2.02 0 00:05:00
2 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10 3.74 56.17 2.75 0.16 0.59 0.15 0 00:25:00
3 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2 0.24 98.00 2.75 2.52 0.61 0.87 0 00:05:00
4 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3 0.83 93.18 2.75 2.03 1.69 2.60 0 00:05:00
5 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4 0.09 61.00 2.75 0.27 0.03 0.03 0 00:05:00
6 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5 0.35 87.76 2.75 1.58 0.54 0.87 0 00:05:00
7 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6 0.22 96.92 2.75 2.40 0.52 0.76 0 00:05:00
8 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7 0.70 98.00 2.75 2.52 1.76 2.48 0 00:05:00
9 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8 0.69 56.00 2.75 0.15 0.11 0.06 0 00:05:00
10 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9 1.05 60.22 2.75 0.25 0.27 0.28 0 00:05:00
11 POST-CONSTRUCTION : 11 0.22 61.00 2.75 0.28 0.06 0.07 0 00:05:00
12 POST-CONSTRUCTION : 7A 0.37 98.00 2.75 2.52 0.93 1.32 0 00:05:00
Node Summary
SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total
ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded
Elevation Elevation Attained Depth Attained Flooding Volume
Attained Occurrence
(ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)
1 BMP-RISER-DOWN Junction 773.50 780.00 773.50 0.00 0.00 0.12 773.60 0.00 8.57 0 00:00 0.00
2 BMP-RISER-UP Junction 775.50 782.00 775.50 0.00 0.00 0.02 775.55 0.00 6.45 0 00:00 0.00
3 SITE-OUTLET-JUNCTION-DOWN Junction 773.00 780.00 773.00 0.00 0.00 0.25 773.08 0.00 10.92 0 00:00 0.00
4 SITE-OUTLET-JUNCTION-UP Junction 775.25 782.00 775.25 0.00 0.00 0.08 775.32 0.00 7.93 0 00:00 0.00
5 DOWNSTREAM Outfall 764.00 0.25 764.08
6 UPSTREAM Outfall 775.00 0.08 775.07
7 WET-POND-DOWN Storage Node 769.00 780.00 777.50 0.00 8.96 778.73 0.00
8 WET-POND-UP Storage Node 774.00 782.00 779.50 0.00 2.05 780.25 0.00
Link Summary
SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow Peak Flow Total Time
ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Velocity Depth Surcharged
Node Elevation Elevation
(ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft)(min)
1 BMP-BARREL-DOWN Pipe BMP-RISER-DOWN SITE-OUTLET-JUNCTION-DOWN 20.00 773.50 773.00 2.5000 18.000 0.0120 0.12 17.99 3.35 0.08 0.00
2 BMP-BARREL-UP Pipe BMP-RISER-UP SITE-OUTLET-JUNCTION-UP 20.00 775.50 775.25 1.2500 18.000 0.0120 0.02 12.72 1.48 0.06 0.00
3 PIPE - 1 Pipe YARD INLET - 2 DROP INLET - 1 92.75 784.50 784.00 0.5400 15.000 0.0120 0.03 5.14 0.92 0.17 0.00
4 PIPE - 2 Pipe YARD INLET - 1 DROP INLET - 1 41.71 784.50 784.00 1.2000 15.000 0.0120 0.87 7.66 3.61 0.31 0.00
5 PIPE - 3 Pipe DROP INLET - 1 CURB INLET - 1 242.58 783.90 781.40 1.0300 15.000 0.0120 1.62 7.10 2.68 0.62 0.00
6 PIPE - 4 Pipe CURB INLET - 1 WET-POND-DOWN 138.42 781.30 780.50 0.5800 24.000 0.0120 6.67 18.63 5.00 0.88 0.00
7 SITE-OUTLET-LINK-DOWN Pipe SITE-OUTLET-JUNCTION-DOWN DOWNSTREAM 100.00 773.00 764.00 9.0000 36.000 0.0120 0.25 216.77 5.05 0.08 0.00
8 SITE-OUTLET-LINK-UP Pipe SITE-OUTLET-JUNCTION-UP UPSTREAM 20.00 775.25 775.00 1.2500 36.000 0.0120 0.08 80.79 1.73 0.07 0.00
9 PRINCIPAL-SPILLWAY-DOWN Orifice WET-POND-DOWN BMP-RISER-DOWN 769.00 773.50 2.000 0.12
10 PRINCIPAL-SPILLWAY-UP Orifice WET-POND-UP BMP-RISER-UP 774.00 775.50 1.000 0.02
11 SECONDARY-OUTLET-DOWN Orifice WET-POND-DOWN BMP-RISER-DOWN 769.00 773.50 36.000 0.00
12 SECONDARY-OUTLET-UP Orifice WET-POND-UP BMP-RISER-UP 774.00 775.50 36.000 0.00
13 EMERGENCY-SPILLWAY-DOWN Weir WET-POND-DOWN SITE-OUTLET-JUNCTION-DOWN 769.00 773.00 0.00
14 EMERGENCY-SPILLWAY-UP Weir WET-POND-UP SITE-OUTLET-JUNCTION-UP 774.00 775.25 0.00
Inlet Summary
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Initial Ponded Peak Peak Flow Peak Flow Inlet Allowable Max Gutter Max Gutter
ID Manufacturer Part Location Inlets Invert Elevation Water Area Flow Intercepted Bypassing Efficiency Spread Spread Water Elev.
Number Elevation Elevation by Inlet during Peak during Peak during Peak
Inlet Flow Flow Flow
(ft)(ft)(ft)(ft²)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)
1 CURB INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 781.30 787.50 781.30 10.00 5.08 N/A N/A N/A 7.00 7.57 788.76
2 DROP INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 783.90 789.50 783.90 10.00 0.76 N/A N/A N/A 7.00 2.57 789.65
3 YARD INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 787.50 784.50 10.00 0.87 N/A N/A N/A 7.00 2.93 787.67
4 YARD INLET - 2 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 788.50 784.50 10.00 0.03 N/A N/A N/A 7.00 0.10 788.51
Subbasin Hydrology
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1
Input Data
Area (ac) .....................................................0.82
Weighted Curve Number ............................87.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.82 -87.22
Composite Area & Weighted CN 0.82 87.22
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................1.54
Peak Runoff (cfs) ........................................2.02
Weighted Curve Number ............................87.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10
Input Data
Area (ac) .....................................................3.74
Weighted Curve Number ............................56.17
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-3.74 -56.17
Composite Area & Weighted CN 3.74 56.17
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................0.16
Peak Runoff (cfs) ........................................0.15
Weighted Curve Number ............................56.17
Time of Concentration (days hh:mm:ss) .....0 00:25:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2
Input Data
Area (ac) .....................................................0.24
Weighted Curve Number ............................98.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.24 -98.00
Composite Area & Weighted CN 0.24 98.00
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................2.52
Peak Runoff (cfs) ........................................0.87
Weighted Curve Number ............................98.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3
Input Data
Area (ac) .....................................................0.83
Weighted Curve Number ............................93.18
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.83 -93.18
Composite Area & Weighted CN 0.83 93.18
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................2.03
Peak Runoff (cfs) ........................................2.60
Weighted Curve Number ............................93.18
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4
Input Data
Area (ac) .....................................................0.09
Weighted Curve Number ............................61.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.09 -61.00
Composite Area & Weighted CN 0.09 61.00
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................0.27
Peak Runoff (cfs) ........................................0.03
Weighted Curve Number ............................61.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5
Input Data
Area (ac) .....................................................0.35
Weighted Curve Number ............................87.76
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.35 -87.76
Composite Area & Weighted CN 0.35 87.76
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................1.58
Peak Runoff (cfs) ........................................0.87
Weighted Curve Number ............................87.76
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6
Input Data
Area (ac) .....................................................0.22
Weighted Curve Number ............................96.92
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.22 -96.92
Composite Area & Weighted CN 0.22 96.92
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................2.40
Peak Runoff (cfs) ........................................0.76
Weighted Curve Number ............................96.92
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7
Input Data
Area (ac) .....................................................0.70
Weighted Curve Number ............................98.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.70 -98.00
Composite Area & Weighted CN 0.70 98.00
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................2.52
Peak Runoff (cfs) ........................................2.48
Weighted Curve Number ............................98.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8
Input Data
Area (ac) .....................................................0.69
Weighted Curve Number ............................56.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.69 -56.00
Composite Area & Weighted CN 0.69 56.00
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................0.15
Peak Runoff (cfs) ........................................0.06
Weighted Curve Number ............................56.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9
Input Data
Area (ac) .....................................................1.05
Weighted Curve Number ............................60.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-1.05 -60.22
Composite Area & Weighted CN 1.05 60.22
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................0.25
Peak Runoff (cfs) ........................................0.28
Weighted Curve Number ............................60.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9
Subbasin : POST-CONSTRUCTION : 11
Input Data
Area (ac) .....................................................0.22
Weighted Curve Number ............................61.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.22 -61.00
Composite Area & Weighted CN 0.22 61.00
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................0.28
Peak Runoff (cfs) ........................................0.07
Weighted Curve Number ............................61.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : POST-CONSTRUCTION : 11
Subbasin : POST-CONSTRUCTION : 7A
Input Data
Area (ac) .....................................................0.37
Weighted Curve Number ............................98.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.35 -98.00
Composite Area & Weighted CN 0.35 98.00
Subbasin Runoff Results
Total Rainfall (in) .........................................2.75
Total Runoff (in) ..........................................2.52
Peak Runoff (cfs) ........................................1.32
Weighted Curve Number ............................98.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : POST-CONSTRUCTION : 7A
Junction Input
SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum
ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe
Elevation Offset Elevation Depth Cover
(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in)
1 BMP-RISER-DOWN 773.50 780.00 6.50 773.50 0.00 0.00 -780.00 0.00 0.00
2 BMP-RISER-UP 775.50 782.00 6.50 775.50 0.00 0.00 -782.00 0.00 0.00
3 SITE-OUTLET-JUNCTION-DOWN 773.00 780.00 7.00 773.00 0.00 0.00 -780.00 0.00 0.00
4 SITE-OUTLET-JUNCTION-UP 775.25 782.00 6.75 775.25 0.00 0.00 -782.00 0.00 0.00
Junction Results
SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time
ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded
Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume
Attained Occurrence
(cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min)
1 BMP-RISER-DOWN 0.12 0.00 773.60 0.10 0.00 8.57 773.57 0.07 1 00:44 0 00:00 0.00 0.00
2 BMP-RISER-UP 0.02 0.00 775.55 0.05 0.00 6.45 775.54 0.04 1 00:09 0 00:00 0.00 0.00
3 SITE-OUTLET-JUNCTION-DOWN 0.25 0.15 773.08 0.08 0.00 10.92 773.04 0.04 0 12:21 0 00:00 0.00 0.00
4 SITE-OUTLET-JUNCTION-UP 0.08 0.06 775.32 0.07 0.00 7.93 775.28 0.03 0 12:02 0 00:00 0.00 0.00
Pipe Input
SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial
ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow
Elevation Offset Elevation Offset Height
(ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs)
1 BMP-BARREL-DOWN 20.00 773.50 0.00 773.00 0.00 0.50 2.5000 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00
2 BMP-BARREL-UP 20.00 775.50 0.00 775.25 0.00 0.25 1.2500 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00
3 PIPE - 1 92.75 784.50 0.00 784.00 0.10 0.50 0.5400 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
4 PIPE - 2 41.71 784.50 0.00 784.00 0.10 0.50 1.2000 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
5 PIPE - 3 242.58 783.90 0.00 781.40 0.10 2.50 1.0300 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
6 PIPE - 4 138.42 781.30 0.00 780.50 11.50 0.80 0.5800 CIRCULAR 24.000 24.000 0.0120 0.5000 0.5000 0.0000 0.00
7 SITE-OUTLET-LINK-DOWN 100.00 773.00 0.00 764.00 0.00 9.00 9.0000 CIRCULAR 36.000 36.000 0.0120 0.5000 0.5000 0.0000 0.00
8 SITE-OUTLET-LINK-UP 20.00 775.25 0.00 775.00 0.00 0.25 1.2500 CIRCULAR 36.000 36.000 0.0120 0.5000 0.5000 0.0000 0.00
Pipe Results
SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported
ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Condition
Occurrence Ratio Total Depth
Ratio
(cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min)
1 BMP-BARREL-DOWN 0.12 0 19:36 17.99 0.01 3.35 0.10 0.08 0.05 0.00 Calculated
2 BMP-BARREL-UP 0.02 1 00:01 12.72 0.00 1.48 0.23 0.06 0.04 0.00 Calculated
3 PIPE - 1 0.03 0 12:02 5.14 0.01 0.92 1.68 0.17 0.14 0.00 Calculated
4 PIPE - 2 0.87 0 11:55 7.66 0.11 3.61 0.19 0.31 0.25 0.00 Calculated
5 PIPE - 3 1.62 0 11:56 7.10 0.23 2.68 1.51 0.62 0.50 0.00 Calculated
6 PIPE - 4 6.67 0 11:55 18.63 0.36 5.00 0.46 0.88 0.44 0.00 Calculated
7 SITE-OUTLET-LINK-DOWN 0.25 0 12:21 216.77 0.00 5.05 0.33 0.08 0.03 0.00 Calculated
8 SITE-OUTLET-LINK-UP 0.08 0 12:02 80.79 0.00 1.73 0.19 0.07 0.02 0.00 Calculated
Inlet Input
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Inlet Initial Initial Ponded Grate
ID Manufacturer Part Location Inlets Invert Elevation Depth Water Water Area Clogging
Number Elevation Elevation Depth Factor
(ft)(ft)(ft)(ft)(ft)(ft²)(%)
1 CURB INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 781.30 787.50 6.20 781.30 0.00 10.00 0.00
2 DROP INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 783.90 789.50 5.60 783.90 0.00 10.00 0.00
3 YARD INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 787.50 3.00 784.50 0.00 10.00 0.00
4 YARD INLET - 2 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 788.50 4.00 784.50 0.00 10.00 0.00
Roadway & Gutter Input
SN Element Roadway Roadway Roadway Gutter Gutter Gutter Allowable
ID Longitudinal Cross Manning's Cross Width Depression Spread
Slope Slope Roughness Slope
(ft/ft)(ft/ft)(ft/ft)(ft)(in)(ft)
1 CURB INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
2 DROP INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
3 YARD INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
4 YARD INLET - 2 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
Inlet Results
SN Element Peak Peak Peak Flow Peak Flow Inlet Max Gutter Max Gutter Max Gutter Time of Total Total Time
ID Flow Lateral Intercepted Bypassing Efficiency Spread Water Elev.Water Depth Max Depth Flooded Flooded
Inflow by Inlet during Peak during Peak during Peak during Peak Occurrence Volume
Inlet Flow Flow Flow Flow
(cfs)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)(days hh:mm)(ac-in)(min)
1 CURB INLET - 1 5.08 5.08 N/A N/A N/A 7.57 788.76 1.26 0 11:55 0.00 0.00
2 DROP INLET - 1 0.76 0.76 N/A N/A N/A 2.57 789.65 0.15 0 11:56 0.00 0.00
3 YARD INLET - 1 0.87 0.87 N/A N/A N/A 2.93 787.67 0.17 0 11:55 0.00 0.00
4 YARD INLET - 2 0.03 0.03 N/A N/A N/A 0.10 788.51 0.01 0 12:02 0.00 0.00
Storage Nodes
Storage Node : WET-POND-DOWN
Input Data
769.00
780.00
11.00
777.50
8.50
0.00
0.00
Storage Area Volume Curves
Storage Curve : WET-POND-DOWN
Stage Storage Storage
Area Volume
(ft)(ft²)(ft³)
0 3461 0.000
1 4011 3736.00
2 4596 8039.50
3 5214 12944.50
4 5867 18485.00
5 6535 24686.00
6 7229 31568.00
7 7948 39156.50
8 8692 47476.50
8.5 12614 52803.00
9 14795 59655.25
9.5 15559 67243.75
10 16337 75217.75
11 17935 92353.75
Evaporation Loss ......................................................................................................
Invert Elevation (ft) ....................................................................................................
Max (Rim) Elevation (ft) ............................................................................................
Max (Rim) Offset (ft) .................................................................................................
Initial Water Elevation (ft) .........................................................................................
Initial Water Depth (ft) ...............................................................................................
Ponded Area (ft²) ......................................................................................................
Storage Node : WET-POND-DOWN (continued)
Outflow Weirs
SN Element Weir Flap Crest Crest Length Weir Total Discharge
ID Type Gate Elevation Offset Height Coefficient
(ft)(ft)(ft)(ft)
1 EMERGENCY-SPILLWAY-DOWN Trapezoidal No 779.00 10.00 30.00 1.00 3.33
Outflow Orifices
SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice
ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient
Diameter Height Width Elevation
(in)(in)(in)(ft)
1 PRINCIPAL-SPILLWAY-DOWN Side CIRCULAR No 2.00 777.50 0.61
2 SECONDARY-OUTLET-DOWN Bottom Rectangular No 36.00 36.00 778.75 0.63
Output Summary Results
8.96
2.30
0.12
0.00
778.73
9.73
778.17
9.17
0 19:35
0.000
0
0
0.00
Total Time Flooded (min) .........................................................................................
Total Retention Time (sec) .......................................................................................
Max HGL Depth Attained (ft) ....................................................................................
Average HGL Elevation Attained (ft) .........................................................................
Average HGL Depth Attained (ft) ..............................................................................
Time of Max HGL Occurrence (days hh:mm) ..........................................................
Total Exfiltration Volume (1000-ft³) ...........................................................................
Total Flooded Volume (ac-in) ...................................................................................
Peak Inflow (cfs) .......................................................................................................
Peak Lateral Inflow (cfs) ...........................................................................................
Peak Outflow (cfs) ....................................................................................................
Peak Exfiltration Flow Rate (cfm) .............................................................................
Max HGL Elevation Attained (ft) ...............................................................................
Storage Node : WET-POND-UP
Input Data
774.00
782.00
8.00
779.50
5.50
0.00
0.00
Storage Area Volume Curves
Storage Curve : WET-POND-UP
Stage Storage Storage
Area Volume
(ft)(ft²)(ft³)
0 791 0.000
1 1118 954.50
2 1474 2250.50
3 1858 3916.50
4 2270 5980.50
5 2705 8468.00
5.5 4260 10209.25
6 5528 12656.25
6.5 6023 15544.00
7 6553 18688.00
8 7595 25762.00
Initial Water Depth (ft) ...............................................................................................
Ponded Area (ft²) ......................................................................................................
Evaporation Loss ......................................................................................................
Invert Elevation (ft) ....................................................................................................
Max (Rim) Elevation (ft) ............................................................................................
Max (Rim) Offset (ft) .................................................................................................
Initial Water Elevation (ft) .........................................................................................
Storage Node : WET-POND-UP (continued)
Outflow Weirs
SN Element Weir Flap Crest Crest Length Weir Total Discharge
ID Type Gate Elevation Offset Height Coefficient
(ft)(ft)(ft)(ft)
1 EMERGENCY-SPILLWAY-UP Trapezoidal No 781.00 7.00 20.00 1.00 3.33
Outflow Orifices
SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice
ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient
Diameter Height Width Elevation
(in)(in)(in)(ft)
1 PRINCIPAL-SPILLWAY-UP Side CIRCULAR No 1.00 779.50 0.61
2 SECONDARY-OUTLET-UP Bottom Rectangular No 36.00 36.00 780.50 0.63
Output Summary Results
2.05
2.05
0.02
0.00
780.25
6.25
779.92
5.92
1 00:01
0.000
0
0
0.00
Total Exfiltration Volume (1000-ft³) ...........................................................................
Total Flooded Volume (ac-in) ...................................................................................
Total Time Flooded (min) .........................................................................................
Total Retention Time (sec) .......................................................................................
Peak Exfiltration Flow Rate (cfm) .............................................................................
Max HGL Elevation Attained (ft) ...............................................................................
Max HGL Depth Attained (ft) ....................................................................................
Average HGL Elevation Attained (ft) .........................................................................
Average HGL Depth Attained (ft) ..............................................................................
Time of Max HGL Occurrence (days hh:mm) ..........................................................
Peak Inflow (cfs) .......................................................................................................
Peak Lateral Inflow (cfs) ...........................................................................................
Peak Outflow (cfs) ....................................................................................................

BREC, P.A. Makson, Inc. | Stormwater Calculations 14
10 year, 24 hour Routing

Project Description
POST-CON-ROUTING-EXPANSION-WET-POND_04162018.SPF
Project Options
CFS
Elevation
SCS TR-55
User-Defined
Hydrodynamic
YES
YES
Analysis Options
Nov 28, 2017 00:00:00
Dec 01, 2017 00:00:00
Nov 28, 2017 00:00:00
0 days
0 01:00:00 days hh:mm:ss
0 00:05:00 days hh:mm:ss
0 00:00:15 days hh:mm:ss
15 seconds
Number of Elements
Qty
1
12
12
4
2
0
4
2
14
0
8
0
4
2
0
0
0
Rainfall Details
SN Rain Gage Data Data Source Rainfall Rain State County Return Rainfall Rainfall
ID Source ID Type Units Period Depth Distribution
(years)(inches)
1 SALISBURY Time Series 10YR-24HR Cumulative inches North Carolina Rowan 10 4.84 SCS Type II 24-hr
Orifices ...................................................
Weirs ......................................................
Outlets ...................................................
Pollutants ........................................................
Land Uses ......................................................
Inlets ......................................................
Storage Nodes .......................................
Links................................................................
Channels ................................................
Pipes ......................................................
Pumps ....................................................
Rain Gages ....................................................
Subbasins........................................................
Nodes..............................................................
Junctions ................................................
Outfalls ...................................................
Flow Diversions .....................................
Start Reporting On .........................................
Antecedent Dry Days ......................................
Runoff (Dry Weather) Time Step ...................
Runoff (Wet Weather) Time Step ..................
Reporting Time Step ......................................
Routing Time Step ..........................................
Time of Concentration (TOC) Method ............
Link Routing Method ......................................
Enable Overflow Ponding at Nodes ...............
Skip Steady State Analysis Time Periods ......
Start Analysis On ............................................
End Analysis On .............................................
File Name .......................................................
Description .....................................................Z:\CURRENT_PROJECTS\310_SCOTT_MITCHELL\3100042017_MAKSON_HEADQUARTERS\PRODUCTION_DW
GS\3100042017_C100-STORMWATER.dwg
Flow Units .......................................................
Elevation Type ................................................
Hydrology Method ..........................................
Subbasin Summary
SN Subbasin Area Weighted Total Total Total Peak Time of
ID Curve Rainfall Runoff Runoff Runoff Concentration
Number Volume
(ac)(in)(in)(ac-in)(cfs)(days hh:mm:ss)
1 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1 0.82 87.22 4.84 3.44 2.83 4.41 0 00:05:00
2 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10 3.74 56.17 4.84 0.97 3.62 2.88 0 00:25:00
3 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2 0.24 98.00 4.84 4.60 1.11 1.54 0 00:05:00
4 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3 0.83 93.18 4.84 4.06 3.37 5.00 0 00:05:00
5 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4 0.09 61.00 4.84 1.27 0.12 0.18 0 00:05:00
6 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5 0.35 87.76 4.84 3.49 1.20 1.87 0 00:05:00
7 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6 0.22 96.92 4.84 4.48 0.98 1.37 0 00:05:00
8 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7 0.70 98.00 4.84 4.60 3.22 4.43 0 00:05:00
9 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8 0.69 56.00 4.84 0.96 0.66 0.90 0 00:05:00
10 {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9 1.05 60.22 4.84 1.22 1.29 1.87 0 00:05:00
11 POST-CONSTRUCTION : 11 0.22 61.00 4.84 1.27 0.28 0.41 0 00:05:00
12 POST-CONSTRUCTION : 7A 0.37 98.00 4.84 4.60 1.70 2.35 0 00:05:00
Node Summary
SN Element Element Invert Ground/Rim Initial Surcharge Ponded Peak Max HGL Max Min Time of Total
ID Type Elevation (Max)Water Elevation Area Inflow Elevation Surcharge Freeboard Peak Flooded
Elevation Elevation Attained Depth Attained Flooding Volume
Attained Occurrence
(ft)(ft)(ft)(ft)(ft²)(cfs)(ft)(ft)(ft)(days hh:mm)(ac-in)
1 BMP-RISER-DOWN Junction 773.50 780.00 773.50 0.00 0.00 7.58 774.56 0.00 7.61 0 00:00 0.00
2 BMP-RISER-UP Junction 775.50 782.00 775.50 0.00 0.00 1.12 775.87 0.00 6.13 0 00:00 0.00
3 SITE-OUTLET-JUNCTION-DOWN Junction 773.00 780.00 773.00 0.00 0.00 11.93 773.54 0.00 10.46 0 00:00 0.00
4 SITE-OUTLET-JUNCTION-UP Junction 775.25 782.00 775.25 0.00 0.00 1.44 775.59 0.00 7.66 0 00:00 0.00
5 DOWNSTREAM Outfall 764.00 11.93 764.48
6 UPSTREAM Outfall 775.00 1.44 775.28
7 WET-POND-DOWN Storage Node 769.00 780.00 777.50 0.00 18.47 779.08 0.00
8 WET-POND-UP Storage Node 774.00 782.00 779.50 0.00 4.80 780.59 0.00
Link Summary
SN Element Element From To (Outlet)Length Inlet Outlet Average Diameter or Manning's Peak Design Flow Peak Flow Peak Flow Total Time
ID Type (Inlet)Node Invert Invert Slope Height Roughness Flow Capacity Velocity Depth Surcharged
Node Elevation Elevation
(ft)(ft)(ft)(%)(in)(cfs)(cfs)(ft/sec)(ft)(min)
1 BMP-BARREL-DOWN Pipe BMP-RISER-DOWN SITE-OUTLET-JUNCTION-DOWN 20.00 773.50 773.00 2.5000 18.000 0.0120 7.59 17.99 7.94 0.80 0.00
2 BMP-BARREL-UP Pipe BMP-RISER-UP SITE-OUTLET-JUNCTION-UP 20.00 775.50 775.25 1.2500 18.000 0.0120 1.12 12.72 3.52 0.36 0.00
3 PIPE - 1 Pipe YARD INLET - 2 DROP INLET - 1 92.75 784.50 784.00 0.5400 15.000 0.0120 0.18 5.14 0.99 0.33 0.00
4 PIPE - 2 Pipe YARD INLET - 1 DROP INLET - 1 41.71 784.50 784.00 1.2000 15.000 0.0120 1.87 7.66 4.00 0.51 0.00
5 PIPE - 3 Pipe DROP INLET - 1 CURB INLET - 1 242.58 783.90 781.40 1.0300 15.000 0.0120 3.40 7.10 3.47 0.93 0.00
6 PIPE - 4 Pipe CURB INLET - 1 WET-POND-DOWN 138.42 781.30 780.50 0.5800 24.000 0.0120 12.76 18.63 5.72 1.34 0.00
7 SITE-OUTLET-LINK-DOWN Pipe SITE-OUTLET-JUNCTION-DOWN DOWNSTREAM 100.00 773.00 764.00 9.0000 36.000 0.0120 11.93 216.77 14.96 0.51 0.00
8 SITE-OUTLET-LINK-UP Pipe SITE-OUTLET-JUNCTION-UP UPSTREAM 20.00 775.25 775.00 1.2500 36.000 0.0120 1.44 80.79 3.70 0.31 0.00
9 PRINCIPAL-SPILLWAY-DOWN Orifice WET-POND-DOWN BMP-RISER-DOWN 769.00 773.50 2.000 0.13
10 PRINCIPAL-SPILLWAY-UP Orifice WET-POND-UP BMP-RISER-UP 774.00 775.50 1.000 0.03
11 SECONDARY-OUTLET-DOWN Orifice WET-POND-DOWN BMP-RISER-DOWN 769.00 773.50 36.000 7.45
12 SECONDARY-OUTLET-UP Orifice WET-POND-UP BMP-RISER-UP 774.00 775.50 36.000 1.09
13 EMERGENCY-SPILLWAY-DOWN Weir WET-POND-DOWN SITE-OUTLET-JUNCTION-DOWN 769.00 773.00 2.14
14 EMERGENCY-SPILLWAY-UP Weir WET-POND-UP SITE-OUTLET-JUNCTION-UP 774.00 775.25 0.00
Inlet Summary
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Initial Ponded Peak Peak Flow Peak Flow Inlet Allowable Max Gutter Max Gutter
ID Manufacturer Part Location Inlets Invert Elevation Water Area Flow Intercepted Bypassing Efficiency Spread Spread Water Elev.
Number Elevation Elevation by Inlet during Peak during Peak during Peak
Inlet Flow Flow Flow
(ft)(ft)(ft)(ft²)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)
1 CURB INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 781.30 787.50 781.30 10.00 9.42 N/A N/A N/A 7.00 14.72 788.26
2 DROP INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 783.90 789.50 783.90 10.00 1.37 N/A N/A N/A 7.00 3.95 789.72
3 YARD INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 787.50 784.50 10.00 1.87 N/A N/A N/A 7.00 4.72 787.76
4 YARD INLET - 2 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 788.50 784.50 10.00 0.18 N/A N/A N/A 7.00 0.61 788.53
Subbasin Hydrology
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1
Input Data
Area (ac) .....................................................0.82
Weighted Curve Number ............................87.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.82 -87.22
Composite Area & Weighted CN 0.82 87.22
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................3.44
Peak Runoff (cfs) ........................................4.41
Weighted Curve Number ............................87.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 1
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10
Input Data
Area (ac) .....................................................3.74
Weighted Curve Number ............................56.17
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-3.74 -56.17
Composite Area & Weighted CN 3.74 56.17
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................0.97
Peak Runoff (cfs) ........................................2.88
Weighted Curve Number ............................56.17
Time of Concentration (days hh:mm:ss) .....0 00:25:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 10
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2
Input Data
Area (ac) .....................................................0.24
Weighted Curve Number ............................98.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.24 -98.00
Composite Area & Weighted CN 0.24 98.00
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................4.60
Peak Runoff (cfs) ........................................1.54
Weighted Curve Number ............................98.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 2
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3
Input Data
Area (ac) .....................................................0.83
Weighted Curve Number ............................93.18
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.83 -93.18
Composite Area & Weighted CN 0.83 93.18
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................4.06
Peak Runoff (cfs) ........................................5.00
Weighted Curve Number ............................93.18
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 3
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4
Input Data
Area (ac) .....................................................0.09
Weighted Curve Number ............................61.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.09 -61.00
Composite Area & Weighted CN 0.09 61.00
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................1.27
Peak Runoff (cfs) ........................................0.18
Weighted Curve Number ............................61.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 4
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5
Input Data
Area (ac) .....................................................0.35
Weighted Curve Number ............................87.76
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.35 -87.76
Composite Area & Weighted CN 0.35 87.76
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................3.49
Peak Runoff (cfs) ........................................1.87
Weighted Curve Number ............................87.76
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 5
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6
Input Data
Area (ac) .....................................................0.22
Weighted Curve Number ............................96.92
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.22 -96.92
Composite Area & Weighted CN 0.22 96.92
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................4.48
Peak Runoff (cfs) ........................................1.37
Weighted Curve Number ............................96.92
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 6
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7
Input Data
Area (ac) .....................................................0.70
Weighted Curve Number ............................98.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.70 -98.00
Composite Area & Weighted CN 0.70 98.00
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................4.60
Peak Runoff (cfs) ........................................4.43
Weighted Curve Number ............................98.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 7
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8
Input Data
Area (ac) .....................................................0.69
Weighted Curve Number ............................56.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.69 -56.00
Composite Area & Weighted CN 0.69 56.00
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................0.96
Peak Runoff (cfs) ........................................0.90
Weighted Curve Number ............................56.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 8
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9
Input Data
Area (ac) .....................................................1.05
Weighted Curve Number ............................60.22
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-1.05 -60.22
Composite Area & Weighted CN 1.05 60.22
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................1.22
Peak Runoff (cfs) ........................................1.87
Weighted Curve Number ............................60.22
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : {POST-CONSTRUCTION}.POST-CONSTRUCTION : 9
Subbasin : POST-CONSTRUCTION : 11
Input Data
Area (ac) .....................................................0.22
Weighted Curve Number ............................61.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.22 -61.00
Composite Area & Weighted CN 0.22 61.00
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................1.27
Peak Runoff (cfs) ........................................0.41
Weighted Curve Number ............................61.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : POST-CONSTRUCTION : 11
Subbasin : POST-CONSTRUCTION : 7A
Input Data
Area (ac) .....................................................0.37
Weighted Curve Number ............................98.00
Rain Gage ID ...............................................SALISBURY
Composite Curve Number
Area Soil Curve
Soil/Surface Description (acres)Group Number
-0.35 -98.00
Composite Area & Weighted CN 0.35 98.00
Subbasin Runoff Results
Total Rainfall (in) .........................................4.84
Total Runoff (in) ..........................................4.60
Peak Runoff (cfs) ........................................2.35
Weighted Curve Number ............................98.00
Time of Concentration (days hh:mm:ss) .....0 00:05:00
Subbasin : POST-CONSTRUCTION : 7A
Junction Input
SN Element Invert Ground/Rim Ground/Rim Initial Initial Surcharge Surcharge Ponded Minimum
ID Elevation (Max)(Max)Water Water Elevation Depth Area Pipe
Elevation Offset Elevation Depth Cover
(ft)(ft)(ft)(ft)(ft)(ft)(ft)(ft²)(in)
1 BMP-RISER-DOWN 773.50 780.00 6.50 773.50 0.00 0.00 -780.00 0.00 0.00
2 BMP-RISER-UP 775.50 782.00 6.50 775.50 0.00 0.00 -782.00 0.00 0.00
3 SITE-OUTLET-JUNCTION-DOWN 773.00 780.00 7.00 773.00 0.00 0.00 -780.00 0.00 0.00
4 SITE-OUTLET-JUNCTION-UP 775.25 782.00 6.75 775.25 0.00 0.00 -782.00 0.00 0.00
Junction Results
SN Element Peak Peak Max HGL Max HGL Max Min Average HGL Average HGL Time of Time of Total Total Time
ID Inflow Lateral Elevation Depth Surcharge Freeboard Elevation Depth Max HGL Peak Flooded Flooded
Inflow Attained Attained Depth Attained Attained Attained Occurrence Flooding Volume
Attained Occurrence
(cfs)(cfs)(ft)(ft)(ft)(ft)(ft)(ft)(days hh:mm)(days hh:mm)(ac-in)(min)
1 BMP-RISER-DOWN 7.58 0.00 774.56 1.06 0.00 7.61 773.61 0.11 0 12:03 0 00:00 0.00 0.00
2 BMP-RISER-UP 1.12 0.00 775.87 0.37 0.00 6.13 775.56 0.06 0 12:06 0 00:00 0.00 0.00
3 SITE-OUTLET-JUNCTION-DOWN 11.93 2.88 773.54 0.54 0.00 10.46 773.06 0.06 0 12:04 0 00:00 0.00 0.00
4 SITE-OUTLET-JUNCTION-UP 1.44 0.90 775.59 0.34 0.00 7.66 775.30 0.05 0 12:04 0 00:00 0.00 0.00
Pipe Input
SN Element Length Inlet Inlet Outlet Outlet Total Average Pipe Pipe Pipe Manning's Entrance Exit/Bend Additional Initial
ID Invert Invert Invert Invert Drop Slope Shape Diameter or Width Roughness Losses Losses Losses Flow
Elevation Offset Elevation Offset Height
(ft)(ft)(ft)(ft)(ft)(ft)(%)(in)(in)(cfs)
1 BMP-BARREL-DOWN 20.00 773.50 0.00 773.00 0.00 0.50 2.5000 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00
2 BMP-BARREL-UP 20.00 775.50 0.00 775.25 0.00 0.25 1.2500 CIRCULAR 18.000 18.000 0.0120 0.5000 0.5000 0.0000 0.00
3 PIPE - 1 92.75 784.50 0.00 784.00 0.10 0.50 0.5400 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
4 PIPE - 2 41.71 784.50 0.00 784.00 0.10 0.50 1.2000 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
5 PIPE - 3 242.58 783.90 0.00 781.40 0.10 2.50 1.0300 CIRCULAR 15.000 15.000 0.0120 0.5000 0.5000 0.0000 0.00
6 PIPE - 4 138.42 781.30 0.00 780.50 11.50 0.80 0.5800 CIRCULAR 24.000 24.000 0.0120 0.5000 0.5000 0.0000 0.00
7 SITE-OUTLET-LINK-DOWN 100.00 773.00 0.00 764.00 0.00 9.00 9.0000 CIRCULAR 36.000 36.000 0.0120 0.5000 0.5000 0.0000 0.00
8 SITE-OUTLET-LINK-UP 20.00 775.25 0.00 775.00 0.00 0.25 1.2500 CIRCULAR 36.000 36.000 0.0120 0.5000 0.5000 0.0000 0.00
Pipe Results
SN Element Peak Time of Design Flow Peak Flow/Peak Flow Travel Peak Flow Peak Flow Total Time Froude Reported
ID Flow Peak Flow Capacity Design Flow Velocity Time Depth Depth/Surcharged Number Condition
Occurrence Ratio Total Depth
Ratio
(cfs)(days hh:mm)(cfs)(ft/sec)(min)(ft)(min)
1 BMP-BARREL-DOWN 7.59 0 12:04 17.99 0.42 7.94 0.04 0.80 0.53 0.00 Calculated
2 BMP-BARREL-UP 1.12 0 12:06 12.72 0.09 3.52 0.09 0.36 0.24 0.00 Calculated
3 PIPE - 1 0.18 0 11:56 5.14 0.03 0.99 1.56 0.33 0.27 0.00 Calculated
4 PIPE - 2 1.87 0 11:55 7.66 0.24 4.00 0.17 0.51 0.41 0.00 Calculated
5 PIPE - 3 3.40 0 11:55 7.10 0.48 3.47 1.17 0.93 0.74 0.00 Calculated
6 PIPE - 4 12.76 0 11:56 18.63 0.68 5.72 0.40 1.34 0.67 0.00 Calculated
7 SITE-OUTLET-LINK-DOWN 11.93 0 12:04 216.77 0.06 14.96 0.11 0.51 0.17 0.00 Calculated
8 SITE-OUTLET-LINK-UP 1.44 0 12:05 80.79 0.02 3.70 0.09 0.31 0.10 0.00 Calculated
Inlet Input
SN Element Inlet Manufacturer Inlet Number of Catchbasin Max (Rim)Inlet Initial Initial Ponded Grate
ID Manufacturer Part Location Inlets Invert Elevation Depth Water Water Area Clogging
Number Elevation Elevation Depth Factor
(ft)(ft)(ft)(ft)(ft)(ft²)(%)
1 CURB INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 781.30 787.50 6.20 781.30 0.00 10.00 0.00
2 DROP INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 783.90 789.50 5.60 783.90 0.00 10.00 0.00
3 YARD INLET - 1 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 787.50 3.00 784.50 0.00 10.00 0.00
4 YARD INLET - 2 FHWA HEC-22 GENERIC N/A On Sag 1 784.50 788.50 4.00 784.50 0.00 10.00 0.00
Roadway & Gutter Input
SN Element Roadway Roadway Roadway Gutter Gutter Gutter Allowable
ID Longitudinal Cross Manning's Cross Width Depression Spread
Slope Slope Roughness Slope
(ft/ft)(ft/ft)(ft/ft)(ft)(in)(ft)
1 CURB INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
2 DROP INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
3 YARD INLET - 1 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
4 YARD INLET - 2 N/A 0.0500 0.0130 0.0620 2.00 0.0000 7.00
Inlet Results
SN Element Peak Peak Peak Flow Peak Flow Inlet Max Gutter Max Gutter Max Gutter Time of Total Total Time
ID Flow Lateral Intercepted Bypassing Efficiency Spread Water Elev.Water Depth Max Depth Flooded Flooded
Inflow by Inlet during Peak during Peak during Peak during Peak Occurrence Volume
Inlet Flow Flow Flow Flow
(cfs)(cfs)(cfs)(cfs)(%)(ft)(ft)(ft)(days hh:mm)(ac-in)(min)
1 CURB INLET - 1 9.42 9.42 N/A N/A N/A 14.72 788.26 0.76 0 11:55 0.00 0.00
2 DROP INLET - 1 1.37 1.37 N/A N/A N/A 3.95 789.72 0.22 0 11:55 0.00 0.00
3 YARD INLET - 1 1.87 1.87 N/A N/A N/A 4.72 787.76 0.26 0 11:55 0.00 0.00
4 YARD INLET - 2 0.18 0.18 N/A N/A N/A 0.61 788.53 0.03 0 11:56 0.00 0.00
Storage Nodes
Storage Node : WET-POND-DOWN
Input Data
769.00
780.00
11.00
777.50
8.50
0.00
0.00
Storage Area Volume Curves
Storage Curve : WET-POND-DOWN
Stage Storage Storage
Area Volume
(ft)(ft²)(ft³)
0 3461 0.000
1 4011 3736.00
2 4596 8039.50
3 5214 12944.50
4 5867 18485.00
5 6535 24686.00
6 7229 31568.00
7 7948 39156.50
8 8692 47476.50
8.5 12614 52803.00
9 14795 59655.25
9.5 15559 67243.75
10 16337 75217.75
11 17935 92353.75
Evaporation Loss ......................................................................................................
Invert Elevation (ft) ....................................................................................................
Max (Rim) Elevation (ft) ............................................................................................
Max (Rim) Offset (ft) .................................................................................................
Initial Water Elevation (ft) .........................................................................................
Initial Water Depth (ft) ...............................................................................................
Ponded Area (ft²) ......................................................................................................
Storage Node : WET-POND-DOWN (continued)
Outflow Weirs
SN Element Weir Flap Crest Crest Length Weir Total Discharge
ID Type Gate Elevation Offset Height Coefficient
(ft)(ft)(ft)(ft)
1 EMERGENCY-SPILLWAY-DOWN Trapezoidal No 779.00 10.00 30.00 1.00 3.33
Outflow Orifices
SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice
ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient
Diameter Height Width Elevation
(in)(in)(in)(ft)
1 PRINCIPAL-SPILLWAY-DOWN Side CIRCULAR No 2.00 777.50 0.61
2 SECONDARY-OUTLET-DOWN Bottom Rectangular No 36.00 36.00 778.75 0.63
Output Summary Results
18.47
5.72
9.72
0.00
779.08
10.08
778.25
9.25
0 12:03
0.000
0
0
0.00
Total Time Flooded (min) .........................................................................................
Total Retention Time (sec) .......................................................................................
Max HGL Depth Attained (ft) ....................................................................................
Average HGL Elevation Attained (ft) .........................................................................
Average HGL Depth Attained (ft) ..............................................................................
Time of Max HGL Occurrence (days hh:mm) ..........................................................
Total Exfiltration Volume (1000-ft³) ...........................................................................
Total Flooded Volume (ac-in) ...................................................................................
Peak Inflow (cfs) .......................................................................................................
Peak Lateral Inflow (cfs) ...........................................................................................
Peak Outflow (cfs) ....................................................................................................
Peak Exfiltration Flow Rate (cfm) .............................................................................
Max HGL Elevation Attained (ft) ...............................................................................
Storage Node : WET-POND-UP
Input Data
774.00
782.00
8.00
779.50
5.50
0.00
0.00
Storage Area Volume Curves
Storage Curve : WET-POND-UP
Stage Storage Storage
Area Volume
(ft)(ft²)(ft³)
0 791 0.000
1 1118 954.50
2 1474 2250.50
3 1858 3916.50
4 2270 5980.50
5 2705 8468.00
5.5 4260 10209.25
6 5528 12656.25
6.5 6023 15544.00
7 6553 18688.00
8 7595 25762.00
Initial Water Depth (ft) ...............................................................................................
Ponded Area (ft²) ......................................................................................................
Evaporation Loss ......................................................................................................
Invert Elevation (ft) ....................................................................................................
Max (Rim) Elevation (ft) ............................................................................................
Max (Rim) Offset (ft) .................................................................................................
Initial Water Elevation (ft) .........................................................................................
Storage Node : WET-POND-UP (continued)
Outflow Weirs
SN Element Weir Flap Crest Crest Length Weir Total Discharge
ID Type Gate Elevation Offset Height Coefficient
(ft)(ft)(ft)(ft)
1 EMERGENCY-SPILLWAY-UP Trapezoidal No 781.00 7.00 20.00 1.00 3.33
Outflow Orifices
SN Element Orifice Orifice Flap Circular Rectangular Rectangular Orifice Orifice
ID Type Shape Gate Orifice Orifice Orifice Invert Coefficient
Diameter Height Width Elevation
(in)(in)(in)(ft)
1 PRINCIPAL-SPILLWAY-UP Side CIRCULAR No 1.00 779.50 0.61
2 SECONDARY-OUTLET-UP Bottom Rectangular No 36.00 36.00 780.50 0.63
Output Summary Results
4.80
4.80
1.12
0.00
780.59
6.59
780.13
6.13
0 12:06
0.000
0
0
0.00
Total Exfiltration Volume (1000-ft³) ...........................................................................
Total Flooded Volume (ac-in) ...................................................................................
Total Time Flooded (min) .........................................................................................
Total Retention Time (sec) .......................................................................................
Peak Exfiltration Flow Rate (cfm) .............................................................................
Max HGL Elevation Attained (ft) ...............................................................................
Max HGL Depth Attained (ft) ....................................................................................
Average HGL Elevation Attained (ft) .........................................................................
Average HGL Depth Attained (ft) ..............................................................................
Time of Max HGL Occurrence (days hh:mm) ..........................................................
Peak Inflow (cfs) .......................................................................................................
Peak Lateral Inflow (cfs) ...........................................................................................
Peak Outflow (cfs) ....................................................................................................