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HomeMy WebLinkAbout2024.04.03-Sennebogen Expansion SWM Report-SignedStormwater Management Report For Sennebogen Expansion 1957 Sennebogen Trail, Stanley, NC Property ID: 3691941330/54664 Date: April 4, 2024 CES Project #8189 Prepared By: CES Group Engineers, LLP 3525 Whitehall Park Drive, Suite 150 Charlotte, NC 28273 704.489.1500 List of Exhibits: · Exhibit 1: Drawing Number C1.1 - Pre-development Drainage Area Map · Exhibit 2: Drawing Number C1.2 - Post-development Drainage Area Map · Exhibit 3: Sediment Basin Calculations · Exhibit 4: Stormwater Conveyance Calculations · Exhibit 5: Stormwater Drainage calculations (Hydro CAD, 2, 10, 25, 50 and 100 Yr storm) · Exhibit 6: Soil Maps Project Description The proposed project includes the construction of a detached commercial building addition to the two existing buildings totaling 48,000 sf with the associated parking lot, drives, proposed gravel demonstration pad, and sand filter. The proposed use of the building will be vehicle services. There is one existing connection to Sennebogen Trail. There is an existing intermittent stream onsite as determined in the field by Atlas Environmental Inc. on September 29, 2023 that will be partially impacted by the proposed work. Pre-Development Conditions The pre-development site is divided into two drainage areas, DA-1 and DA-2. The DA-1 is 7.60 acres and has HSG B & D soils, resulting in a CN value 71. DA-1 includes the existing original building truck docks and a portion of Sennebogen Trail as well as several acres of undeveloped area west of Sennebogen Trail. DA- 1 includes the upstream extents of the existing intermittent stream. The pre-development time of concentration for DA-1 was calculated to be 19.4 minutes. DA-2 is 1.34 acres and has HSG B soils which results in a CN value of 72. DA-2 consists of the northernmost portion of the truck drive in bays, Sennebogen trail, concrete pad and wooded area. The pre-development time of concentration for DA-2 was calculated to be 7.3 minutes (see attached Tc calculations in HydroCAD report). Pre-development drainage areas summary: Area Name Total Drainage Area (Sf) Total Drainage Area (Ac) Total Impervious Area (Sf) Total Impervious Area (Ac) Tc (Min) DA-1 330,991 7.60 77,146 1.77 19.4 DA-2 58,307 1.34 23,324 0.54 7.3 Post-Development Conditions The post-development site is divided into three drainage areas, DA-1A, DA-1B and DA-2. The proposed contributing drainage area to the proposed sand filter consists of grass, open space, proposed buildings, sidewalks, parking lots, drives, and a gravel demonstration pad. For purposes of this analysis, the drainage area was divided into impervious and open space areas. The post-development drainage area DA-1 is 9.27 acres. The drainage area has HSG B & D soils which results in a weighted CN value of 84. The post-development time of concentration was calculated to be 6.6 minutes. The proposed sand filter was modeled in HydroCAD. The sand filter will be an above ground facility to provide water quality treatment of the first 1.0” of rainfall over the entire contributing drainage area based on the maximum buildout of the site. The sand filter will also control the peak flows from the 1-yr, 2-yr, and 10-yr, 24-hour storm events. The control structure will be a concrete riser with 4’x4’ inside dimensions. The water quality design volume will completely drain through the sand filter. The 1-yr, 2-yr and 10-yr storms will be controlled with a series or orifices/weirs in the primary riser structure. A 24”W x 8”H rectangular weir will be set at elevation 739.50. A 24”W x 6”H rectangular weir will be set at elevation 740.75. The top of the riser will be set at 741.25 with a top trash rack extending above this elevation. There will also be a 20’ wide emergency spillway on the west side of the embankment which will be lined with class B riprap with spillway elevation of 741.50. The top of the embankment will be set at 743.00. The second post-development drainage area that discharges offsite, DA-1B is 0.27 acres and has HSG D soils which results in a weighted CN value of 80. The post-development time of concentration was assumed to be 5 minutes. This area includes the pervious areas downstream of the sand filter and stormwater conveyance system, primarily consisting of the slope down to the outfall. The third post-development drainage area that discharges offsite, DA-2 is 0.44 acres and has HSG B soils which results in a weighted CN value of 84. The post-development time of concentration was assumed to be 5 minutes. This area includes areas of existing parking lot and sidewalks as well as some open space areas towards the north end of the existing/proposed development. Post-development drainage areas summary: Area Name Total Drainage Area (Sf) Total Drainage Area (Ac) Total Impervious Area (Sf) Total Impervious Area (Ac) Tc (Min) DA-1A 403,915 9.27 230,292 5.29 6.6 DA-1B 11,678 0.27 0 0 5 DA-2 19,316 0.44 11,932 0.27 5 STORMWATER MANAGEMENT ANALYSIS-PRE AND POST ANALYSIS A summary of the pre and post-developed flows for the 2-yr, 10-yr, and 25-yr storm events is included below. We are able to provide pre-vs post flow reduction for the 2-yr and 10-yr storm events. We've tried to route as much of the proposed impervious area and overall area through the sand filter as possible. Summary of pre and post-discharges for DA-1 (DA-1A + DA-1B): 2-yr (cfs) 10-yr (cfs) 25-yr (cfs) PRE 7.80 17.38 23.67 POST 5.20 14.81 30.28 Summary of pre and post-discharges for DA-2: 2-yr (cfs) 10-yr (cfs) 25-yr (cfs) PRE 2.31 4.87 6.52 POST 1.47 2.52 3.16 Analysis Methodology & Design Parameters The existing and proposed drainage areas have been analyzed utilizing a modified version of the NRCS SCS TR-20 method. The analysis program “HydroCAD” Version 10.20 by HydroCAD Software Solutions LLC was used to calculate and plot the runoff hydrographs. The program incorporates the time of concentration, CN values, 24-hour rainfall events, and project drainage areas to calculate the runoff characteristics. IDF information from NOAA has been utilized for storm events. Additional information used in the analysis includes the SCS Unit Hydrograph, a minimum time of concentration of 5 minutes, separate runoff calculations for impervious and pervious areas, and dynamic storage and conveyance routing to account for any variable tailwater conditions. Water Quality Measures Per the NCDEQ Stormwater Standards, water quality for a high density development is to provide treatment volume for the 1" storm event. The development proposes one (1) water quality measure to capture and treat a large portion of the site. The forebay is designed for 85% minimum TSS removal and is anticipated to treat greater than the 1" storm event for the site. The proposed sand filter system shall be designed to clean all water entering the system to the satisfaction of NCDEQ. Refer to Exhibit 5 for 1" stormwater calculations. Stormwater Conveyance The proposed stormwater conveyance system consists of both swales and a closed pipe system. The proposed pipe materials include Type S HDPE, Class III RCP and Class IV RCP. The pipe system was sized utilizing Hydraflow Storm Sewers for the 10-yr storm event. Refer to Exhibit 4 for the stormwater conveyance calculations. Soil Erosion Control The proposed project includes three soil erosion control phases. Phase 1 is to install two rock dams in the existing stream area and a bypass drainage pipe system to convey the offsite runoff around the majority of the proposed construction area. Also included are silt fence, silt fence outlets and a riprap apron. Phase 2 is to add a construction entrance, concrete washout, silt fence, silt fence outlets, temporary diversion ditches, slope drains and sediment basin. The sediment basin is sized to handle the 10-yr runoff from approximately 7.50 acres of contributing drainage area. Phase 3 is to install a second sediment basin in the location of the permanent sand filter. This will allow the remaining portion of the demonstration pad to be filled and raised to final grade. The upstream drainage area must be completely stabilized before installing the sand filter system, gravel, and sand to prevent clogging the system. Riprap aprons at outfalls were sized utilizing the NCDEQ Erosion Control Design Manual section 6.41 on Outfall Stabilization Structures. The sediment basin is sized to handle the 10-yr runoff from approximately 9.33 acres of contributing drainage area. Refer to Exhibit 3 for the Sediment Basin calculations. Exhibit 1 Drawing Number C1.1: Pre-development Drainage Area Map SLT Enterprises, LLC SLT Enterprises, LLC Curtis Phillips Pamela W. Phillips Mishelle S. Dean Catherleen H. Sherrill SE N N E B O G E N T R A I L Pond Old HEAVY DUTY PAVEMENT OVERLAY HEAVY DUTY PAVEMENT OVERLAY ADDITION 45,840-sf WAREHOUSE 8''F SS SS SS 2''W PRE-DEVELOPMENT DRAINAGE AREA 1 DA-1 7.60 AC CN=71 TC=19.4 MIN PRE-DEVELOPMENT DRAINAGE AREA 2 PRE DA-2 1.34 AC CN=72 TC=7.3 MIN TC PATH (TYP) S: \ E N G I N E E R \ P R O J E C T S \ 8 1 8 9 . 0 8 2 3 C D - S E N N E B O G E N E X P A N S I O N \ D R A W I N G S \ S H E E T S \ 8 1 8 9 - S - D R A I N A G E A R E A S P R E A N D P O S T B M P . D W G , Ap r i l 3 , 2 0 2 4 SC O L D R E N 1 inch = ft. ( IN FEET ) GRAPHIC SCALE 0 40 20 40 8040 C1.1 PRE-DEV DRAINAGE AREA MAP JM MK - SC R Know what's below. Call before you dig. NORTH CAROLINA ONE-CALL CENTER INC. DIAL 811 or 1-800-632-4949 2 BUSINESS DAYS BEFORE DIGGING www.ncocc.org OW N E R / D E V E L O P E R DRAWN BY: CHECKED BY: PROJECT NO: DRAWING TITLE: DRAWING NUMBER: SEAL: DATE:NO:REVISION DESC. DRAWING REVISIONS Copyright 2024 CES Group Engineers, LLP PR O J E C T D E S C R I P T I O N : REVISED BY: ISSUED BY: CES Group Engineers, LLP 3525 Whitehall Park Drive, Suite 150 Charlotte, NC 28273 PH: 704.489.1500 www.ces-group.net ENGINEERS PLANNERS SURVEYORS SCIENTISTS CO. SEAL: ISSUE DATE: - - - - - - - -- - - - - - - - - - - - - 02/22/2024 8189.0823 SE N N E B O G E N E X P A N S I O N S. C . H O N D R O S & A S S O C I A T E S , I N C . P. O . B O X 2 2 0 4 5 6 , C H A R L O T T E , N C 2 8 2 2 2 - 0 4 5 6 19 5 7 S E N N E B O G E N T R A I L ST A N L E Y , N C 2 8 1 6 4 LEGEND DRAINAGE AREA Exhibit 2 Drawing Number C1.2: Post-development Drainage Area Map 1111 11 1111 SLT Enterprises, LLC SLT Enterprises, LLC Curtis Phillips Pamela W. Phillips Mishelle S. Dean Catherleen H. Sherrill SE N N E B O G E N T R A I L HEAVY DUTY PAVEMENT OVERLAY HEAVY DUTY PAVEMENT OVERLAY ADDITION 45,840-sf WAREHOUSE SD SD SD SD SD SD SD SD SD SD SD SD SD SD SD SDSD 755 760 765 770 730 735 740 74 0 740 745 74 5 745 75 0 7 5 0 75 0 75 0 750 750 75 0 75 0 755 75 5 75 5 760 76 0 76 0 76 5 76 5 77 0 77 0 770755 76 0 75 3 754 756 757 758 75 9 PROPOSED POST CONSTRUCTION BMP MH-508 DI-400 DI-112 DI-111 DI-106 DI-105 DI-401 MH-506 CB-103 MH-102MH-504 FES-500 DI-402 DI-113 DI-107 CB-300 CB-301 76 5 77 0 76 6 76 7 76 8 76 9 770775 8''F SS SS SS 2''W DI-403 POST-DEVELOPMENT DRAINAGE AREA 1A 9.27 AC CN=84 TC=6.6 MIN POST-DEVELOPMENT DRAINAGE AREA 2 0.44 AC CN=84 TC=5 MIN POST-DEVELOPMENT DRAINAGE AREA 1B 0.27 AC CN=80 TC=5 MIN MH-104 YI-101 MH-505 FES-100 YI-200 OS-600 YI-201 MH-503 MH-502 MH-501 YI-202 YI-203 MH-507 DI-108 DI-109 DI-110 S: \ E N G I N E E R \ P R O J E C T S \ 8 1 8 9 . 0 8 2 3 C D - S E N N E B O G E N E X P A N S I O N \ D R A W I N G S \ S H E E T S \ 8 1 8 9 - S - D R A I N A G E A R E A S P R E A N D P O S T B M P . D W G , Ap r i l 3 , 2 0 2 4 SC O L D R E N 1 inch = ft. ( IN FEET ) GRAPHIC SCALE 0 40 20 40 8040 C1.2 POST-DEV DRAINAGE AREA MAP JM MK - SC R Know what's below. Call before you dig. NORTH CAROLINA ONE-CALL CENTER INC. DIAL 811 or 1-800-632-4949 2 BUSINESS DAYS BEFORE DIGGING www.ncocc.org LEGEND DRAINAGE AREA OW N E R / D E V E L O P E R DRAWN BY: CHECKED BY: PROJECT NO: DRAWING TITLE: DRAWING NUMBER: SEAL: DATE:NO:REVISION DESC. DRAWING REVISIONS Copyright 2024 CES Group Engineers, LLP PR O J E C T D E S C R I P T I O N : REVISED BY: ISSUED BY: CES Group Engineers, LLP 3525 Whitehall Park Drive, Suite 150 Charlotte, NC 28273 PH: 704.489.1500 www.ces-group.net ENGINEERS PLANNERS SURVEYORS SCIENTISTS CO. SEAL: ISSUE DATE: - - - - - - - -- - - - - - - - - - - - - 02/22/2024 8189.0823 SE N N E B O G E N E X P A N S I O N S. C . H O N D R O S & A S S O C I A T E S , I N C . P. O . B O X 2 2 0 4 5 6 , C H A R L O T T E , N C 2 8 2 2 2 - 0 4 5 6 19 5 7 S E N N E B O G E N T R A I L ST A N L E Y , N C 2 8 1 6 4 Exhibit 3 Sediment Basin Calculations Areas (sf) 10-yr 5 min 7.84 Total Drainage Area (Acres)341682 C I (in/hr) 41.95 Peak Flow from 10-year Storm (cfs) Q is calculated based on Drainage Area 0.75 7.13 Do Not Use Temporary Sediment Trap Okay Skimmer Sediment Basin User entry Okay Temporary Sediment Basin Calculated Value 4.90 Disturbed Area (Acres)213238 Updated to comply with NPDES Permit Conditions TGH and BRB 07/03/2012 Updated to provide instructions and additional checks JEC 07/17/2023 Phase 2 Simplified design Okay 4.90 Disturbed Area (Acres) Imported from the "Measure Selection" tab. 41.9 Peak Flow from 10-year Storm (cfs) 8811.488 Required Volume ft3 Minimum sediment storage volume. Based upon the disturbed area. 18271 Required Surface Area ft 2 Required surface area of basin. Based upon peak flow for the entire drainage area. 95.6 Suggested Width ft 191.2 Suggested Length ft 100 Trial Top Width at Emergency Spillway Invert ft 200 Trial Top Length at Emergency Spillway Invert ft 2 Trial Side Slope Ratio Z:1 (2.5:1 or flatter) 3 Trial Depth ft (2 to 13.5 feet above grade) Depth as measured from bottom of basin to crest of emergency spillway. 88 Bottom Width ft 188 Bottom Length ft 16544 Bottom Area ft2 54744 Actual Volume ft 3 Okay 20000 Actual Surface Area ft 2 Okay Use Spillway Capacity Sheet to Size Primary and Emergency Spillways 2 Skimmer Size (inches) Skimmer Size Formula based on the use of a Faircloth skimmer type 0.167 Head on Skimmer (feet) (Inches) 1.75 Orifice Size (1/4 inch increments) 1.5 3.05 Dewatering Time (days)2 Dewatering time is computed for the REQUIRED volume and takes into consideration the head on skimmer and orifice size. Suggest about 3 days 2.5 The skimmer must take at least 2 days and no more than 5 days to dewater the REQUIRED volume. 3 4 5 6 8 Check L:W ratio Check dam height (max. 15 ft) Okay 2:1 to 6:1 Okay Water surface for 10-year storm can be no greater than 13.5 feet in depth (13 ft + 0.5 ft of head on spillway assumed). Cleanout elevation (ft) 739.00 Elevation of bottom of basin near riser structure 740.5 Depth at one-half of sediment storage volume. Elevation to be staked in the field. ft3 Stage (ft) Area (ft2) Area (ac) Avg Area (ac) Increm. Cumulative 738 15,802 0.363 0.000 0.000 0.000 0 739 16,800 0.386 0.374 0.374 0.374 16,301 740 17,824 0.409 0.397 0.397 0.772 33,613 741 18,273 0.419 0.414 0.414 1.186 51,662 741.5 19,111 0.439 0.429 0.215 1.401 61,007 742 19,948 0.458 0.448 0.224 1.625 70,772 743 21,047 0.483 0.471 0.471 2.095 91,270 Temporary Sediment Basin Volume (ac-ft) Areas (sf) 10-yr 5 min 9.33 Total Drainage Area (Acres)406550 C I (in/hr) 49.91 Peak Flow from 10-year Storm (cfs) Q is calculated based on Drainage Area 0.75 7.13 Do Not Use Temporary Sediment Trap Okay Skimmer Sediment Basin User entry Okay Temporary Sediment Basin Calculated Value 6.66 Disturbed Area (Acres)290000 Updated to comply with NPDES Permit Conditions TGH and BRB 07/03/2012 Updated to provide instructions and additional checks JEC 07/17/2023 Phase 3 Simplified design Okay 6.66 Disturbed Area (Acres) Imported from the "Measure Selection" tab. 49.9 Peak Flow from 10-year Storm (cfs) 11983.47 Required Volume ft3 Minimum sediment storage volume. Based upon the disturbed area. 21740 Required Surface Area ft 2 Required surface area of basin. Based upon peak flow for the entire drainage area. 104.3 Suggested Width ft 208.5 Suggested Length ft 105 Trial Top Width at Emergency Spillway Invert ft 210 Trial Top Length at Emergency Spillway Invert ft 2 Trial Side Slope Ratio Z:1 (2.5:1 or flatter) 5.5 Trial Depth ft (2 to 13.5 feet above grade) Depth as measured from bottom of basin to crest of emergency spillway. 83 Bottom Width ft 188 Bottom Length ft 15604 Bottom Area ft2 103105 Actual Volume ft 3 Okay 22050 Actual Surface Area ft 2 Okay Use Spillway Capacity Sheet to Size Primary and Emergency Spillways 2.5 Skimmer Size (inches) Skimmer Size Formula based on the use of a Faircloth skimmer type 0.208 Head on Skimmer (feet) (Inches) 1.75 Orifice Size (1/4 inch increments) 1.5 3.71 Dewatering Time (days)2 Dewatering time is computed for the REQUIRED volume and takes into consideration the head on skimmer and orifice size. Suggest about 3 days 2.5 The skimmer must take at least 2 days and no more than 5 days to dewater the REQUIRED volume. 3 4 5 6 8 Check L:W ratio Check dam height (max. 15 ft) Okay 2:1 to 6:1 Okay Water surface for 10-year storm can be no greater than 13.5 feet in depth (13 ft + 0.5 ft of head on spillway assumed). Cleanout elevation (ft) 738.00 Elevation of bottom of basin near riser structure 740.8 Depth at one-half of sediment storage volume. Elevation to be staked in the field. ft3 Stage (ft) Area (ft2) Area (ac) Avg Area (ac) Increm. Cumulative 739 18,028 0.414 0.000 0.000 0.000 0 740 19,595 0.450 0.432 0.432 0.432 741 21,218 0.487 0.487 0.487 0.919 741.5 22,052 0.506 0.497 0.248 1.167 50,847 742 22,899 0.526 0.526 0.263 1.430 62,297 743 24,636 0.566 0.546 0.546 1.976 86,064 Temporary Sediment Basin Volume (ac-ft) Exhibit 4 Stormwater Conveyance Calculations d50 (ft) La (ft) W1=Do + La W1 (ft) W2=3*Do W2 (ft)*T(ft)H=(2/3)*Do H (ft) FES-1 (EC Ph 2) 23.6 24 0.5 15 17.00 6.00 1.125 1.33 FES-100 38.0 30 0.5 17 19.50 7.50 1.125 1.67 FES-500 26.5 30 0.5 20 22.50 7.50 1.125 1.67 dmax=1.5*d50 *T=1.5*dmax (Min. *T=10") Apron Thickness = *T Min. La=10 ft H=Depth of apron Rip-Rap Apron Summary Table Outlet Discharge (cfs)Do (in) Minimum TW Condition Figure 8.06a: Design of outlet protection from a round pipe flowing full, minimum tailwater condition (Tw<0.5 diameter) Return to Main Worksheet FES-1 (EC Phase 2) Figure 8.06a: Design of outlet protection from a round pipe flowing full, minimum tailwater condition (Tw<0.5 diameter) Return to Main Worksheet FES-100 Figure 8.06a: Design of outlet protection from a round pipe flowing full, minimum tailwater condition (Tw<0.5 diameter) Return to Main Worksheet FES-500 Exhibit 5 Stormwater Drainage calculations (Hydro CAD, 2, 10, 25, 50 and 100 Yr storm) Sand Filter Design DATE:4/3/2024 PROJECT:Sennebogen PROJECT #:8189.0823CD DESIGNER:SMC Post Development DA 1A 1 Pre-Dev Post-Dev 330,991 403,915 7.60 9.27 77,146 230,292 1.77 5.29 5.83 3.99 23% 57% *measured from the midpoint of the design storm 2 0.56 0.435 0.56 18,955 14,216 6.00 havg (ft)3.00 2,369 75% WQv / hmax filter 3 Pre-Dev Post-Dev 330,991 403,915 Area HSG CN CN*Area 7.60 9.27 Impervious 1.77 B 98 173.56 71 84 Open Space 0.47 B 61 28.67 95 95 Woods 3.56 B 55 195.80 Woods 1.8 D 77 138.60 19.4 6.6 536.63 Sum 71 CN Weighted Area HSG CN CN*Area Impervious 5.29 B and D 98 518.10 Open Space 3.23 B 61 196.78 Open Space 0.76 D 80 60.80 775.68 Sum 84 CN Weighted 4 9.55 *From HydroCAD Node 7S (Post Dev (Modified CN)) 5 Post-Dev 1.95 2.58 1.16 0.89 6 Drawdown Time (hr) 40 Post-Dev 0.132 RELEASE RATES Water Quality WQv Release (cfs) WATER QUALITY PEAK FLOW WQp (cfs) Area (sf) Area (ac) CN CNm (modified, P=1 in) Travel Time Tt (min) Post-Development CPv (ac-ft) Qd (in) P (in, 1-yr, 24-hr)) S (in) CHANNEL PROTECTION VOLUME 75% WQv (cf) hmax filter(ft) Min. Surface Area (ft) HYDROLOGIC PARAMETERS CURVE NUMBER CALCULATION Pre-Development % Impervious WATER QUALITY CALCULATIONS Runoff Coefficient, Rv WQv (ac-ft) WQv (in) WQv (cf) NCDEQ Stormwater Design Manual Chapter 11 - Sand Filter (Rev September 20, 2009) SITE DATA Target Sand Filter Effectiveness Area to Sand Filter (sf) Impervious (ac)Removal Rate 85% TSS Pervious (ac) Area to Sand Filter (ac)Detention Time (days)*2 Impervious (sf)Media Depth 1.5 ft =0.05 +0.009 ∗ =1.0 ∗ ∗ 12 = 1000 [10 +5 +10 − 10 +1.25 . ] =1000 −10 =2.58− 0.2 +0.8 ! " = (43,560 ∗ ) ()* +,-+. /01 ∗3,600) = ∗ 12 Sand Filter Design 7 1253.2 1.5 3.5 1.000 1.667 1,462 2 54.1 27.0 8 Stage (ft)Area (ft2)Area (ac) Increm. Cumulative 739.00 18,028 0.4139 0.0000 0.0000 740.00 19,595 0.4498 0.4319 0.4319 741.00 21,218 0.4871 0.4685 0.9003 742.00 22,899 0.5257 0.5064 1.4067 743.00 24,636 0.5656 0.5456 1.9523 9 738 Stage Height 739.00 1 740.00 2 741.00 3 742.00 4 743.00 5 0.00 -738 0.00 -738 0.00 -738 10 Stage Storage (ac-ft) 738 #N/A #N/A 0.3264 739 0.0000 11 14,216 0.132 5 0.005 44 6 3 0.196 4 1.571 4 0.40 3280 0.20 50% 1640 2 0.0052 8.5653 Storage Depth (ft) Perforation Capacity (cfs) Total Capacity (cfs) Holes per Row Underdrain Capacity (cfs) Number of perforations Unclogged Capacity (cfs) *Needs to be greater than 1' depth discharge and min. drawdown capacity Percent clogged Unclogged Perforations Length of each pipe (ft)Underdrain Size (in) Number of cleanouts per pipe Underdrain A (ft2) Rows per foot Underdrain P (ft) WQv (ft3) Drawdown (cfs) Compute Perforation Capacity Compute Underdrain Capacity No. of pipes Underdrain Slope (ft/ft) DRAWDOWN AND UNDERDRAIN DESIGN Minimum Drawdown Discharge WATER QUALITY ELEVATION 0.000 0.138 0.178 0.217 -29.084 WATER QUALITY AND CHANNEL PROTECTION ELEVATIONS (ESTIMATED) 0.4685 0.5064 STAGE-DISCHARGE Top of Filter Media Discharge (cfs) 0.5456 0.257 -29.084 -29.084 STAGE-STORAGE Volume (ac-ft) Avg Area (ac) 0.0000 0.4319 Permeability, k (ft/day) Avg height of water, hf (ft) Filter Drain Time, tf (days) Filter Surface Area, Af (ft2) Length-to-Width Ratio Length (ft) SEDIMENTATION As (ft2) FILTRATION Filter Bed Depth, df (ft) Width (ft) SEDIMENTATION AND FILTRATION CHAMBERS 240 ∗ 2 ∗) ∗ , 3 = ∗,3 4 ∗ℎ6 + ,3 ∗ "3 Sand Filter Design DATE:4/3/2024 PROJECT:Sennebogen PROJECT #:8189.0823CD DESIGNER:SMC Post Development DA 1B 1 Pre-Dev Post-Dev 11,678 0.00 0.27 0 0.00 0.00 0.00 0.27 #DIV/0! 0% *measured from the midpoint of the design storm 2 Pre-Dev Post-Dev 0 11,678 Area HSG CN CN*Area 0.00 0.27 0.00 #DIV/0! 80 0.00 #REF! #REF!0.00 0.00 5 0.00 Sum #DIV/0!CN Weighted Area HSG CN CN*Area Open Space 0.27 D 80 21.45 0.00 0.00 21.45 Sum 80 CN Weighted NCDEQ Stormwater Design Manual Chapter 11 - Sand Filter (Rev September 20, 2009) SITE DATA Target Sand Filter Effectiveness Area to Sand Filter (sf) Area to Sand Filter (ac)Detention Time (days)*2 Impervious (sf)Media Depth 1.5 ft Impervious (ac)Removal Rate 85% TSS Pervious (ac) CN CNm (modified, P=1 in) Travel Time Tt (min) Post-Development % Impervious HYDROLOGIC PARAMETERS CURVE NUMBER CALCULATION Pre-Development Area (sf) Area (ac) = 1000 [10 +5 +10 − 10 +1.25 . ] Sand Filter Design DATE:4/3/2024 PROJECT:Sennebogen PROJECT #:8189.0823CD DESIGNER:SMC Post Development DA 2 1 Pre-Dev Post-Dev 58,307 19,316 1.34 0.44 23,324 11,932 0.54 0.27 0.80 0.17 40% 62% *measured from the midpoint of the design storm 2 Pre-Dev Post-Dev 58,307 19,316 Area HSG CN CN*Area 1.34 0.44 Impervious 0.54 B 98 52.47 72 84 Open Space B 61 0.00 #REF! #REF! Woods 0.80 B 55 44.17 0.00 7.3 5 96.64 Sum 72 CN Weighted Area HSG CN CN*Area Impervious 0.27 B 98 26.84 Open Space 0.17 B 61 10.34 0.00 37.18 Sum 84 CN Weighted NCDEQ Stormwater Design Manual Chapter 11 - Sand Filter (Rev September 20, 2009) SITE DATA Target Sand Filter Effectiveness Area to Sand Filter (sf) Area to Sand Filter (ac)Detention Time (days)*2 Impervious (sf)Media Depth 1.5 ft Impervious (ac)Removal Rate 85% TSS Pervious (ac) Post-Development HYDROLOGIC PARAMETERS CURVE NUMBER CALCULATION Pre-Development % Impervious Area (sf) Area (ac) CN CNm (modified, P=1 in) Travel Time Tt (min) = 1000 [10 +5 +10 − 10 +1.25 . ] CES Group Engineers, LLP 274 N. Highway 16 Denver, NC 28037 Buoyant Weight of Concrete 87.6 lbs/ft^3 Weight of Water 62.4 lbs/ft^3 Safety Factor (S.F.) 1.50 Footing depth to be a minimum of 8 inches in depth. Height of structure, h = 4.25 ft. Outlet Structure Weight, W(s) =3351 lbs Structure wall thickness, t =6 in. Displaced Water Weight, W(w) =5304 lbs Outlet box inside dimension, w =4 ft. Req'd Base Weight, W(b) =4605 lbs Required Footing Volume, V(f) =53 cf Standard Footing Length, L =7.00 ft. Provided Footing Volume, V(f) =61 cf Standard Footing Width, W =7.00 ft. Footing Check okay Minimum Footing Depth, D =1.00 ft. Footing Size to be used: Length =7.00 ft. Width =7.00 ft. Outlet Structure - Dry Pond Depth =1.25 ft. Outlet Structure Weight, W(s) = 4(w + t) x t x h x W(bc) where, w = outlet box inside dimension, ft. Displaced Water Weight, W(w) = 4 x (w + 2t) x W(w) x h t = structure wall thickness, ft. h = height of structure, ft. Required Base Weight, W(b) = (W(w) x S.F.) - W(s) W(bc)= buoyant weight of concrete, lbs/ft^3 W(w)= weight of water, lbs/ft^3 Required Footing Volume, V(f) = W(b) / W(bc) S.F.= safety factor Sennebogen Project Number:8189 Original Date:4/2/24 DB:SC Revision Date:PM:JM Standard Data Standard Footing Assumptions Outlet Structure - Dry Pond Structure Dimensions Object Weights Footing Size Equations used: Drainage Area 2Drainage Area 1 1S Pre-Dev 1 5S Post Dev 1A 7S Post Dev (Modified CN) 8S Pre-Dev 2 11S Post Dev 1B 13S Post-Dev 2 6P Sand Filter 12L Analysis Point 1 Routing Diagram for 8189-Sand Filter-Detailed Design Prepared by CES Group Engineers, LLP, Printed 4/3/2024 HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Subcat Reach Pond Link Sennebogen - Sand Filter Design 8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 2HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing Event# Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) AMC 1 1-inch Type II 24-hr Default 24.00 1 1.00 2 2 1-yr Type II 24-hr Default 24.00 1 2.78 2 3 2-yr Type II 24-hr Default 24.00 1 3.36 2 4 10-yr Type II 24-hr Default 24.00 1 4.91 2 5 25-yr Type II 24-hr Default 24.00 1 5.83 2 6 50-yr Type II 24-hr Default 24.00 1 6.57 2 7 100-yr Type II 24-hr Default 24.00 1 7.32 2 Sennebogen - Sand Filter Design 8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 3HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 7.600 71 (1S) 9.710 84 (5S, 13S) 8.860 96 (7S) 1.340 72 (8S) 0.270 80 (11S) 27.780 84 TOTAL AREA Sennebogen - Sand Filter Design 8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 4HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (acres) Soil Group Subcatchment Numbers 0.000 HSG A 0.000 HSG B 0.000 HSG C 0.000 HSG D 27.780 Other 1S, 5S, 7S, 8S, 11S, 13S 27.780 TOTAL AREA Sennebogen - Sand Filter Design 8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 5HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (acres) HSG-B (acres) HSG-C (acres) HSG-D (acres) Other (acres) Total (acres) Ground Cover Subcatchment Numbers 0.000 0.000 0.000 0.000 27.780 27.780 1S, 5S, 7S, 8S, 11S, 13S 0.000 0.000 0.000 0.000 27.780 27.780 TOTAL AREA Sennebogen - Sand Filter Design 8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 6HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pipe Listing (all nodes) Line# Node Number In-Invert (feet) Out-Invert (feet) Length (feet) Slope (ft/ft) n Width (inches) Diam/Height (inches) Inside-Fill (inches) Node Name 1 5S 0.00 0.00 441.0 0.0110 0.013 0.0 15.0 0.0 2 7S 0.00 0.00 441.0 0.0110 0.013 0.0 15.0 0.0 3 6P 737.00 736.30 70.4 0.0099 0.013 0.0 30.0 0.0 Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 7HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=0.01"Subcatchment 1S: Pre-Dev 1 Flow Length=742' Tc=19.4 min CN=71 Runoff=0.01 cfs 0.005 af Runoff Area=9.270 ac 0.00% Impervious Runoff Depth=0.15"Subcatchment 5S: Post Dev 1A Flow Length=688' Tc=6.6 min CN=84 Runoff=2.02 cfs 0.117 af Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=0.63"Subcatchment 7S: Post Dev (Modified CN) Flow Length=688' Tc=6.6 min CN=96 Runoff=9.55 cfs 0.465 af Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=0.01"Subcatchment 8S: Pre-Dev 2 Flow Length=326' Tc=7.3 min CN=72 Runoff=0.00 cfs 0.001 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=0.08"Subcatchment 11S: Post Dev 1B Tc=5.0 min CN=80 Runoff=0.02 cfs 0.002 af Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=0.15"Subcatchment 13S: Post-Dev 2 Tc=5.0 min CN=84 Runoff=0.10 cfs 0.006 af Peak Elev=739.23' Storage=0.098 af Inflow=2.02 cfs 0.117 afPond 6P: Sand Filter Primary=0.02 cfs 0.111 af Secondary=0.00 cfs 0.000 af Outflow=0.02 cfs 0.111 af Inflow=0.03 cfs 0.113 afLink 12L: Analysis Point 1 Primary=0.03 cfs 0.113 af Total Runoff Area = 27.780 ac Runoff Volume = 0.596 af Average Runoff Depth = 0.26" 100.00% Pervious = 27.780 ac 0.00% Impervious = 0.000 ac Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 8HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre-Dev 1 Runoff = 0.01 cfs @ 23.99 hrs, Volume= 0.005 af, Depth= 0.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-inch Rainfall=1.00" Area (ac) CN Description * 7.600 71 7.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.4 100 0.0320 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.2 382 0.1060 5.24 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.8 260 0.0460 5.33 10.65 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 19.4 742 Total Subcatchment 1S: Pre-Dev 1 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 0.007 0.007 0.006 0.006 0.005 0.005 0.004 0.004 0.003 0.003 0.002 0.002 0.001 0.001 0.000 0 Type II 24-hr 1-inch Rainfall=1.00" Runoff Area=7.600 ac Runoff Volume=0.005 af Runoff Depth=0.01" Flow Length=742' Tc=19.4 min CN=71 0.01 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 9HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Dev 1A Runoff = 2.02 cfs @ 12.00 hrs, Volume= 0.117 af, Depth= 0.15" Routed to Pond 6P : Sand Filter Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-inch Rainfall=1.00" Area (ac) CN Description * 9.270 84 9.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 5S: Post Dev 1A Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 2 1 0 Type II 24-hr 1-inch Rainfall=1.00" Runoff Area=9.270 ac Runoff Volume=0.117 af Runoff Depth=0.15" Flow Length=688' Tc=6.6 min CN=84 2.02 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 10HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Dev (Modified CN) [47] Hint: Peak is 141% of capacity of segment #3 Runoff = 9.55 cfs @ 11.98 hrs, Volume= 0.465 af, Depth= 0.63" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-inch Rainfall=1.00" Area (ac) CN Description * 8.860 96 8.860 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 7S: Post Dev (Modified CN) Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 1-inch Rainfall=1.00" Runoff Area=8.860 ac Runoff Volume=0.465 af Runoff Depth=0.63" Flow Length=688' Tc=6.6 min CN=96 9.55 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 11HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre-Dev 2 Runoff = 0.00 cfs @ 17.74 hrs, Volume= 0.001 af, Depth= 0.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-inch Rainfall=1.00" Area (ac) CN Description * 1.340 72 1.340 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 31 0.0450 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.1 179 0.0170 2.65 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.2 78 0.2590 8.19 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 38 0.1130 8.35 16.69 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 7.3 326 Total Subcatchment 8S: Pre-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0.000 0.000 0 0 Type II 24-hr 1-inch Rainfall=1.00" Runoff Area=1.340 ac Runoff Volume=0.001 af Runoff Depth=0.01" Flow Length=326' Tc=7.3 min CN=72 0.00 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 12HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: Post Dev 1B Runoff = 0.02 cfs @ 12.00 hrs, Volume= 0.002 af, Depth= 0.08" Routed to Link 12L : Analysis Point 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-inch Rainfall=1.00" Area (ac) CN Description * 0.270 80 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 11S: Post Dev 1B Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 0.025 0.024 0.023 0.022 0.021 0.02 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 Type II 24-hr 1-inch Rainfall=1.00" Runoff Area=0.270 ac Runoff Volume=0.002 af Runoff Depth=0.08" Tc=5.0 min CN=80 0.02 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 13HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post-Dev 2 Runoff = 0.10 cfs @ 11.98 hrs, Volume= 0.006 af, Depth= 0.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-inch Rainfall=1.00" Area (ac) CN Description * 0.440 84 0.440 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 13S: Post-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 0.115 0.11 0.105 0.1 0.095 0.09 0.085 0.08 0.075 0.07 0.065 0.06 0.055 0.05 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 0 Type II 24-hr 1-inch Rainfall=1.00" Runoff Area=0.440 ac Runoff Volume=0.006 af Runoff Depth=0.15" Tc=5.0 min CN=84 0.10 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 14HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Pond 6P: Sand Filter Inflow Area = 9.270 ac, 0.00% Impervious, Inflow Depth = 0.15" for 1-inch event Inflow = 2.02 cfs @ 12.00 hrs, Volume= 0.117 af Outflow = 0.02 cfs @ 24.09 hrs, Volume= 0.111 af, Atten= 99%, Lag= 725.3 min Primary = 0.02 cfs @ 24.09 hrs, Volume= 0.111 af Routed to Link 12L : Analysis Point 1 Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to nonexistent node 7L Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Peak Elev= 739.23' @ 24.09 hrs Surf.Area= 0.422 ac Storage= 0.098 af Plug-Flow detention time= 2,504.5 min calculated for 0.111 af (95% of inflow) Center-of-Mass det. time= 2,477.1 min ( 3,384.8 - 907.6 ) Volume Invert Avail.Storage Storage Description #1 739.00' 1.953 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 739.00 0.414 0.000 0.000 740.00 0.450 0.432 0.432 741.00 0.487 0.468 0.900 742.00 0.526 0.506 1.407 743.00 0.566 0.546 1.953 Device Routing Invert Outlet Devices #1 Primary 737.00'30.0" Round Culvert L= 70.4' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 739.00'Special & User-Defined Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Disch. (cfs) 0.000 0.102 0.142 0.183 0.224 0.264 0.305 0.346 #3 Device 1 739.50'24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 740.75'24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 741.25'4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area) Limited to weir flow at low heads #6 Secondary 741.50'20.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 15HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=0.02 cfs @ 24.09 hrs HW=739.23' (Free Discharge) 1=Culvert (Passes 0.02 cfs of 23.94 cfs potential flow) 2=Special & User-Defined (Custom Controls 0.02 cfs) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Orifice/Grate ( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge) 6=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 6P: Sand Filter Inflow Outflow Primary Secondary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 2 1 0 Inflow Area=9.270 ac Peak Elev=739.23' Storage=0.098 af 2.02 cfs 0.02 cfs 0.02 cfs 0.00 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 16HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pond 6P: Sand Filter Total Primary Secondary Stage-Discharge Discharge (cfs) 550500450400350300250200150100500 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Special & User-Defined Orifice/Grate Orifice/Grate Orifice/Grate Broad-Crested Rectangular Weir Pond 6P: Sand Filter Surface Storage Stage-Area-Storage Storage (acre-feet) 10 Surface/Horizontal/Wetted Area (acres) 0.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Custom Stage Data Sennebogen - Sand Filter Design Type II 24-hr 1-inch Rainfall=1.00"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 17HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Link 12L: Analysis Point 1 Inflow Area = 9.540 ac, 0.00% Impervious, Inflow Depth > 0.14" for 1-inch event Inflow = 0.03 cfs @ 12.01 hrs, Volume= 0.113 af Primary = 0.03 cfs @ 12.01 hrs, Volume= 0.113 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Link 12L: Analysis Point 1 Inflow Primary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 0 Inflow Area=9.540 ac 0.03 cfs 0.03 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 18HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=0.64"Subcatchment 1S: Pre-Dev 1 Flow Length=742' Tc=19.4 min CN=71 Runoff=4.74 cfs 0.404 af Runoff Area=9.270 ac 0.00% Impervious Runoff Depth=1.34"Subcatchment 5S: Post Dev 1A Flow Length=688' Tc=6.6 min CN=84 Runoff=21.69 cfs 1.033 af Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=2.34"Subcatchment 7S: Post Dev (Modified CN) Flow Length=688' Tc=6.6 min CN=96 Runoff=32.72 cfs 1.725 af Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=0.68"Subcatchment 8S: Pre-Dev 2 Flow Length=326' Tc=7.3 min CN=72 Runoff=1.47 cfs 0.076 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=1.09"Subcatchment 11S: Post Dev 1B Tc=5.0 min CN=80 Runoff=0.55 cfs 0.024 af Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=1.34"Subcatchment 13S: Post-Dev 2 Tc=5.0 min CN=84 Runoff=1.09 cfs 0.049 af Peak Elev=740.09' Storage=0.472 af Inflow=21.69 cfs 1.033 afPond 6P: Sand Filter Primary=3.00 cfs 1.018 af Secondary=0.00 cfs 0.000 af Outflow=3.00 cfs 1.018 af Inflow=3.07 cfs 1.043 afLink 12L: Analysis Point 1 Primary=3.07 cfs 1.043 af Total Runoff Area = 27.780 ac Runoff Volume = 3.311 af Average Runoff Depth = 1.43" 100.00% Pervious = 27.780 ac 0.00% Impervious = 0.000 ac Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 19HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre-Dev 1 Runoff = 4.74 cfs @ 12.14 hrs, Volume= 0.404 af, Depth= 0.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfall=2.78" Area (ac) CN Description * 7.600 71 7.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.4 100 0.0320 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.2 382 0.1060 5.24 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.8 260 0.0460 5.33 10.65 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 19.4 742 Total Subcatchment 1S: Pre-Dev 1 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 5 4 3 2 1 0 Type II 24-hr 1-yr Rainfall=2.78" Runoff Area=7.600 ac Runoff Volume=0.404 af Runoff Depth=0.64" Flow Length=742' Tc=19.4 min CN=71 4.74 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 20HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Dev 1A [47] Hint: Peak is 320% of capacity of segment #3 Runoff = 21.69 cfs @ 11.98 hrs, Volume= 1.033 af, Depth= 1.34" Routed to Pond 6P : Sand Filter Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfall=2.78" Area (ac) CN Description * 9.270 84 9.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 5S: Post Dev 1A Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 1-yr Rainfall=2.78" Runoff Area=9.270 ac Runoff Volume=1.033 af Runoff Depth=1.34" Flow Length=688' Tc=6.6 min CN=84 21.69 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 21HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Dev (Modified CN) [47] Hint: Peak is 483% of capacity of segment #3 Runoff = 32.72 cfs @ 11.97 hrs, Volume= 1.725 af, Depth= 2.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfall=2.78" Area (ac) CN Description * 8.860 96 8.860 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 7S: Post Dev (Modified CN) Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 1-yr Rainfall=2.78" Runoff Area=8.860 ac Runoff Volume=1.725 af Runoff Depth=2.34" Flow Length=688' Tc=6.6 min CN=96 32.72 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 22HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre-Dev 2 Runoff = 1.47 cfs @ 12.00 hrs, Volume= 0.076 af, Depth= 0.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfall=2.78" Area (ac) CN Description * 1.340 72 1.340 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 31 0.0450 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.1 179 0.0170 2.65 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.2 78 0.2590 8.19 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 38 0.1130 8.35 16.69 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 7.3 326 Total Subcatchment 8S: Pre-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 1 0 Type II 24-hr 1-yr Rainfall=2.78" Runoff Area=1.340 ac Runoff Volume=0.076 af Runoff Depth=0.68" Flow Length=326' Tc=7.3 min CN=72 1.47 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 23HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: Post Dev 1B Runoff = 0.55 cfs @ 11.97 hrs, Volume= 0.024 af, Depth= 1.09" Routed to Link 12L : Analysis Point 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfall=2.78" Area (ac) CN Description * 0.270 80 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 11S: Post Dev 1B Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 1-yr Rainfall=2.78" Runoff Area=0.270 ac Runoff Volume=0.024 af Runoff Depth=1.09" Tc=5.0 min CN=80 0.55 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 24HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post-Dev 2 Runoff = 1.09 cfs @ 11.96 hrs, Volume= 0.049 af, Depth= 1.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 1-yr Rainfall=2.78" Area (ac) CN Description * 0.440 84 0.440 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 13S: Post-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 1 0 Type II 24-hr 1-yr Rainfall=2.78" Runoff Area=0.440 ac Runoff Volume=0.049 af Runoff Depth=1.34" Tc=5.0 min CN=84 1.09 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 25HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Pond 6P: Sand Filter Inflow Area = 9.270 ac, 0.00% Impervious, Inflow Depth = 1.34" for 1-yr event Inflow = 21.69 cfs @ 11.98 hrs, Volume= 1.033 af Outflow = 3.00 cfs @ 12.27 hrs, Volume= 1.018 af, Atten= 86%, Lag= 17.4 min Primary = 3.00 cfs @ 12.27 hrs, Volume= 1.018 af Routed to Link 12L : Analysis Point 1 Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to nonexistent node 7L Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Peak Elev= 740.09' @ 12.27 hrs Surf.Area= 0.453 ac Storage= 0.472 af Plug-Flow detention time= 735.7 min calculated for 1.018 af (99% of inflow) Center-of-Mass det. time= 727.2 min ( 1,560.7 - 833.5 ) Volume Invert Avail.Storage Storage Description #1 739.00' 1.953 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 739.00 0.414 0.000 0.000 740.00 0.450 0.432 0.432 741.00 0.487 0.468 0.900 742.00 0.526 0.506 1.407 743.00 0.566 0.546 1.953 Device Routing Invert Outlet Devices #1 Primary 737.00'30.0" Round Culvert L= 70.4' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 739.00'Special & User-Defined Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Disch. (cfs) 0.000 0.102 0.142 0.183 0.224 0.264 0.305 0.346 #3 Device 1 739.50'24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 740.75'24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 741.25'4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area) Limited to weir flow at low heads #6 Secondary 741.50'20.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 26HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=3.00 cfs @ 12.27 hrs HW=740.09' (Free Discharge) 1=Culvert (Passes 3.00 cfs of 35.16 cfs potential flow) 2=Special & User-Defined (Custom Controls 0.11 cfs) 3=Orifice/Grate (Orifice Controls 2.89 cfs @ 2.46 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Orifice/Grate ( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge) 6=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 6P: Sand Filter Inflow Outflow Primary Secondary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=9.270 ac Peak Elev=740.09' Storage=0.472 af 21.69 cfs 3.00 cfs 3.00 cfs 0.00 cfs Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 27HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pond 6P: Sand Filter Total Primary Secondary Stage-Discharge Discharge (cfs) 550500450400350300250200150100500 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Special & User-Defined Orifice/Grate Orifice/Grate Orifice/Grate Broad-Crested Rectangular Weir Pond 6P: Sand Filter Surface Storage Stage-Area-Storage Storage (acre-feet) 10 Surface/Horizontal/Wetted Area (acres) 0.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Custom Stage Data Sennebogen - Sand Filter Design Type II 24-hr 1-yr Rainfall=2.78"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 28HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Link 12L: Analysis Point 1 Inflow Area = 9.540 ac, 0.00% Impervious, Inflow Depth > 1.31" for 1-yr event Inflow = 3.07 cfs @ 12.26 hrs, Volume= 1.043 af Primary = 3.07 cfs @ 12.26 hrs, Volume= 1.043 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Link 12L: Analysis Point 1 Inflow Primary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 3 2 1 0 Inflow Area=9.540 ac 3.07 cfs 3.07 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 29HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=0.98"Subcatchment 1S: Pre-Dev 1 Flow Length=742' Tc=19.4 min CN=71 Runoff=7.80 cfs 0.618 af Runoff Area=9.270 ac 0.00% Impervious Runoff Depth=1.82"Subcatchment 5S: Post Dev 1A Flow Length=688' Tc=6.6 min CN=84 Runoff=29.30 cfs 1.404 af Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=2.91"Subcatchment 7S: Post Dev (Modified CN) Flow Length=688' Tc=6.6 min CN=96 Runoff=40.15 cfs 2.146 af Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=1.03"Subcatchment 8S: Pre-Dev 2 Flow Length=326' Tc=7.3 min CN=72 Runoff=2.31 cfs 0.115 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=1.53"Subcatchment 11S: Post Dev 1B Tc=5.0 min CN=80 Runoff=0.77 cfs 0.034 af Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=1.82"Subcatchment 13S: Post-Dev 2 Tc=5.0 min CN=84 Runoff=1.47 cfs 0.067 af Peak Elev=740.45' Storage=0.638 af Inflow=29.30 cfs 1.404 afPond 6P: Sand Filter Primary=5.09 cfs 1.389 af Secondary=0.00 cfs 0.000 af Outflow=5.09 cfs 1.389 af Inflow=5.20 cfs 1.423 afLink 12L: Analysis Point 1 Primary=5.20 cfs 1.423 af Total Runoff Area = 27.780 ac Runoff Volume = 4.384 af Average Runoff Depth = 1.89" 100.00% Pervious = 27.780 ac 0.00% Impervious = 0.000 ac Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 30HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre-Dev 1 Runoff = 7.80 cfs @ 12.14 hrs, Volume= 0.618 af, Depth= 0.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 2-yr Rainfall=3.36" Area (ac) CN Description * 7.600 71 7.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.4 100 0.0320 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.2 382 0.1060 5.24 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.8 260 0.0460 5.33 10.65 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 19.4 742 Total Subcatchment 1S: Pre-Dev 1 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 8 7 6 5 4 3 2 1 0 Type II 24-hr 2-yr Rainfall=3.36" Runoff Area=7.600 ac Runoff Volume=0.618 af Runoff Depth=0.98" Flow Length=742' Tc=19.4 min CN=71 7.80 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 31HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Dev 1A [47] Hint: Peak is 432% of capacity of segment #3 Runoff = 29.30 cfs @ 11.98 hrs, Volume= 1.404 af, Depth= 1.82" Routed to Pond 6P : Sand Filter Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 2-yr Rainfall=3.36" Area (ac) CN Description * 9.270 84 9.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 5S: Post Dev 1A Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 2-yr Rainfall=3.36" Runoff Area=9.270 ac Runoff Volume=1.404 af Runoff Depth=1.82" Flow Length=688' Tc=6.6 min CN=84 29.30 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 32HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Dev (Modified CN) [47] Hint: Peak is 593% of capacity of segment #3 Runoff = 40.15 cfs @ 11.97 hrs, Volume= 2.146 af, Depth= 2.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 2-yr Rainfall=3.36" Area (ac) CN Description * 8.860 96 8.860 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 7S: Post Dev (Modified CN) Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 2-yr Rainfall=3.36" Runoff Area=8.860 ac Runoff Volume=2.146 af Runoff Depth=2.91" Flow Length=688' Tc=6.6 min CN=96 40.15 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 33HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre-Dev 2 Runoff = 2.31 cfs @ 12.00 hrs, Volume= 0.115 af, Depth= 1.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 2-yr Rainfall=3.36" Area (ac) CN Description * 1.340 72 1.340 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 31 0.0450 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.1 179 0.0170 2.65 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.2 78 0.2590 8.19 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 38 0.1130 8.35 16.69 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 7.3 326 Total Subcatchment 8S: Pre-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 2 1 0 Type II 24-hr 2-yr Rainfall=3.36" Runoff Area=1.340 ac Runoff Volume=0.115 af Runoff Depth=1.03" Flow Length=326' Tc=7.3 min CN=72 2.31 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 34HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: Post Dev 1B Runoff = 0.77 cfs @ 11.96 hrs, Volume= 0.034 af, Depth= 1.53" Routed to Link 12L : Analysis Point 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 2-yr Rainfall=3.36" Area (ac) CN Description * 0.270 80 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 11S: Post Dev 1B Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 0.85 0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 2-yr Rainfall=3.36" Runoff Area=0.270 ac Runoff Volume=0.034 af Runoff Depth=1.53" Tc=5.0 min CN=80 0.77 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 35HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post-Dev 2 Runoff = 1.47 cfs @ 11.96 hrs, Volume= 0.067 af, Depth= 1.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 2-yr Rainfall=3.36" Area (ac) CN Description * 0.440 84 0.440 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 13S: Post-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 1 0 Type II 24-hr 2-yr Rainfall=3.36" Runoff Area=0.440 ac Runoff Volume=0.067 af Runoff Depth=1.82" Tc=5.0 min CN=84 1.47 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 36HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Pond 6P: Sand Filter Inflow Area = 9.270 ac, 0.00% Impervious, Inflow Depth = 1.82" for 2-yr event Inflow = 29.30 cfs @ 11.98 hrs, Volume= 1.404 af Outflow = 5.09 cfs @ 12.19 hrs, Volume= 1.389 af, Atten= 83%, Lag= 12.3 min Primary = 5.09 cfs @ 12.19 hrs, Volume= 1.389 af Routed to Link 12L : Analysis Point 1 Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to nonexistent node 7L Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Peak Elev= 740.45' @ 12.19 hrs Surf.Area= 0.467 ac Storage= 0.638 af Plug-Flow detention time= 560.7 min calculated for 1.389 af (99% of inflow) Center-of-Mass det. time= 554.7 min ( 1,379.4 - 824.8 ) Volume Invert Avail.Storage Storage Description #1 739.00' 1.953 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 739.00 0.414 0.000 0.000 740.00 0.450 0.432 0.432 741.00 0.487 0.468 0.900 742.00 0.526 0.506 1.407 743.00 0.566 0.546 1.953 Device Routing Invert Outlet Devices #1 Primary 737.00'30.0" Round Culvert L= 70.4' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 739.00'Special & User-Defined Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Disch. (cfs) 0.000 0.102 0.142 0.183 0.224 0.264 0.305 0.346 #3 Device 1 739.50'24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 740.75'24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 741.25'4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area) Limited to weir flow at low heads #6 Secondary 741.50'20.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 37HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=5.09 cfs @ 12.19 hrs HW=740.45' (Free Discharge) 1=Culvert (Passes 5.09 cfs of 37.17 cfs potential flow) 2=Special & User-Defined (Custom Controls 0.12 cfs) 3=Orifice/Grate (Orifice Controls 4.97 cfs @ 3.73 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Orifice/Grate ( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge) 6=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 6P: Sand Filter Inflow Outflow Primary Secondary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=9.270 ac Peak Elev=740.45' Storage=0.638 af 29.30 cfs 5.09 cfs 5.09 cfs 0.00 cfs Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 38HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pond 6P: Sand Filter Total Primary Secondary Stage-Discharge Discharge (cfs) 550500450400350300250200150100500 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Special & User-Defined Orifice/Grate Orifice/Grate Orifice/Grate Broad-Crested Rectangular Weir Pond 6P: Sand Filter Surface Storage Stage-Area-Storage Storage (acre-feet) 10 Surface/Horizontal/Wetted Area (acres) 0.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Custom Stage Data Sennebogen - Sand Filter Design Type II 24-hr 2-yr Rainfall=3.36"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 39HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Link 12L: Analysis Point 1 Inflow Area = 9.540 ac, 0.00% Impervious, Inflow Depth > 1.79" for 2-yr event Inflow = 5.20 cfs @ 12.17 hrs, Volume= 1.423 af Primary = 5.20 cfs @ 12.17 hrs, Volume= 1.423 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Link 12L: Analysis Point 1 Inflow Primary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 5 4 3 2 1 0 Inflow Area=9.540 ac 5.20 cfs 5.20 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 40HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=2.05"Subcatchment 1S: Pre-Dev 1 Flow Length=742' Tc=19.4 min CN=71 Runoff=17.38 cfs 1.298 af Runoff Area=9.270 ac 0.00% Impervious Runoff Depth=3.19"Subcatchment 5S: Post Dev 1A Flow Length=688' Tc=6.6 min CN=84 Runoff=50.31 cfs 2.463 af Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=4.44"Subcatchment 7S: Post Dev (Modified CN) Flow Length=688' Tc=6.6 min CN=96 Runoff=59.81 cfs 3.280 af Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=2.13"Subcatchment 8S: Pre-Dev 2 Flow Length=326' Tc=7.3 min CN=72 Runoff=4.87 cfs 0.238 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=2.81"Subcatchment 11S: Post Dev 1B Tc=5.0 min CN=80 Runoff=1.39 cfs 0.063 af Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=3.19"Subcatchment 13S: Post-Dev 2 Tc=5.0 min CN=84 Runoff=2.52 cfs 0.117 af Peak Elev=741.41' Storage=1.102 af Inflow=50.31 cfs 2.463 afPond 6P: Sand Filter Primary=14.54 cfs 2.448 af Secondary=0.00 cfs 0.000 af Outflow=14.54 cfs 2.448 af Inflow=14.81 cfs 2.511 afLink 12L: Analysis Point 1 Primary=14.81 cfs 2.511 af Total Runoff Area = 27.780 ac Runoff Volume = 7.459 af Average Runoff Depth = 3.22" 100.00% Pervious = 27.780 ac 0.00% Impervious = 0.000 ac Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 41HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre-Dev 1 [47] Hint: Peak is 163% of capacity of segment #3 Runoff = 17.38 cfs @ 12.13 hrs, Volume= 1.298 af, Depth= 2.05" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 10-yr Rainfall=4.91" Area (ac) CN Description * 7.600 71 7.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.4 100 0.0320 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.2 382 0.1060 5.24 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.8 260 0.0460 5.33 10.65 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 19.4 742 Total Subcatchment 1S: Pre-Dev 1 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.91" Runoff Area=7.600 ac Runoff Volume=1.298 af Runoff Depth=2.05" Flow Length=742' Tc=19.4 min CN=71 17.38 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 42HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Dev 1A [47] Hint: Peak is 743% of capacity of segment #3 Runoff = 50.31 cfs @ 11.98 hrs, Volume= 2.463 af, Depth= 3.19" Routed to Pond 6P : Sand Filter Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 10-yr Rainfall=4.91" Area (ac) CN Description * 9.270 84 9.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 5S: Post Dev 1A Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 10-yr Rainfall=4.91" Runoff Area=9.270 ac Runoff Volume=2.463 af Runoff Depth=3.19" Flow Length=688' Tc=6.6 min CN=84 50.31 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 43HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Dev (Modified CN) [47] Hint: Peak is 883% of capacity of segment #3 Runoff = 59.81 cfs @ 11.97 hrs, Volume= 3.280 af, Depth= 4.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 10-yr Rainfall=4.91" Area (ac) CN Description * 8.860 96 8.860 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 7S: Post Dev (Modified CN) Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 10-yr Rainfall=4.91" Runoff Area=8.860 ac Runoff Volume=3.280 af Runoff Depth=4.44" Flow Length=688' Tc=6.6 min CN=96 59.81 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 44HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre-Dev 2 Runoff = 4.87 cfs @ 11.99 hrs, Volume= 0.238 af, Depth= 2.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 10-yr Rainfall=4.91" Area (ac) CN Description * 1.340 72 1.340 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 31 0.0450 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.1 179 0.0170 2.65 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.2 78 0.2590 8.19 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 38 0.1130 8.35 16.69 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 7.3 326 Total Subcatchment 8S: Pre-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 5 4 3 2 1 0 Type II 24-hr 10-yr Rainfall=4.91" Runoff Area=1.340 ac Runoff Volume=0.238 af Runoff Depth=2.13" Flow Length=326' Tc=7.3 min CN=72 4.87 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 45HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: Post Dev 1B Runoff = 1.39 cfs @ 11.96 hrs, Volume= 0.063 af, Depth= 2.81" Routed to Link 12L : Analysis Point 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 10-yr Rainfall=4.91" Area (ac) CN Description * 0.270 80 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 11S: Post Dev 1B Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 1 0 Type II 24-hr 10-yr Rainfall=4.91" Runoff Area=0.270 ac Runoff Volume=0.063 af Runoff Depth=2.81" Tc=5.0 min CN=80 1.39 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 46HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post-Dev 2 Runoff = 2.52 cfs @ 11.96 hrs, Volume= 0.117 af, Depth= 3.19" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 10-yr Rainfall=4.91" Area (ac) CN Description * 0.440 84 0.440 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 13S: Post-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 2 1 0 Type II 24-hr 10-yr Rainfall=4.91" Runoff Area=0.440 ac Runoff Volume=0.117 af Runoff Depth=3.19" Tc=5.0 min CN=84 2.52 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 47HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Pond 6P: Sand Filter Inflow Area = 9.270 ac, 0.00% Impervious, Inflow Depth = 3.19" for 10-yr event Inflow = 50.31 cfs @ 11.98 hrs, Volume= 2.463 af Outflow = 14.54 cfs @ 12.11 hrs, Volume= 2.448 af, Atten= 71%, Lag= 8.1 min Primary = 14.54 cfs @ 12.11 hrs, Volume= 2.448 af Routed to Link 12L : Analysis Point 1 Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to nonexistent node 7L Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Peak Elev= 741.41' @ 12.11 hrs Surf.Area= 0.503 ac Storage= 1.102 af Plug-Flow detention time= 352.4 min calculated for 2.448 af (99% of inflow) Center-of-Mass det. time= 349.0 min ( 1,157.7 - 808.7 ) Volume Invert Avail.Storage Storage Description #1 739.00' 1.953 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 739.00 0.414 0.000 0.000 740.00 0.450 0.432 0.432 741.00 0.487 0.468 0.900 742.00 0.526 0.506 1.407 743.00 0.566 0.546 1.953 Device Routing Invert Outlet Devices #1 Primary 737.00'30.0" Round Culvert L= 70.4' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 739.00'Special & User-Defined Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Disch. (cfs) 0.000 0.102 0.142 0.183 0.224 0.264 0.305 0.346 #3 Device 1 739.50'24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 740.75'24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 741.25'4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area) Limited to weir flow at low heads #6 Secondary 741.50'20.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 48HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=14.48 cfs @ 12.11 hrs HW=741.41' (Free Discharge) 1=Culvert (Passes 14.48 cfs of 46.74 cfs potential flow) 2=Special & User-Defined (Custom Controls 0.16 cfs) 3=Orifice/Grate (Orifice Controls 8.04 cfs @ 6.03 fps) 4=Orifice/Grate (Orifice Controls 3.02 cfs @ 3.02 fps) 5=Orifice/Grate (Weir Controls 3.26 cfs @ 1.30 fps) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=739.00' (Free Discharge) 6=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 6P: Sand Filter Inflow Outflow Primary Secondary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=9.270 ac Peak Elev=741.41' Storage=1.102 af 50.31 cfs 14.54 cfs 14.54 cfs 0.00 cfs Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 49HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pond 6P: Sand Filter Total Primary Secondary Stage-Discharge Discharge (cfs) 550500450400350300250200150100500 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Special & User-Defined Orifice/Grate Orifice/Grate Orifice/Grate Broad-Crested Rectangular Weir Pond 6P: Sand Filter Surface Storage Stage-Area-Storage Storage (acre-feet) 10 Surface/Horizontal/Wetted Area (acres) 0.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Custom Stage Data Sennebogen - Sand Filter Design Type II 24-hr 10-yr Rainfall=4.91"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 50HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Link 12L: Analysis Point 1 Inflow Area = 9.540 ac, 0.00% Impervious, Inflow Depth > 3.16" for 10-yr event Inflow = 14.81 cfs @ 12.11 hrs, Volume= 2.511 af Primary = 14.81 cfs @ 12.11 hrs, Volume= 2.511 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Link 12L: Analysis Point 1 Inflow Primary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=9.540 ac 14.81 cfs 14.81 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 51HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=2.76"Subcatchment 1S: Pre-Dev 1 Flow Length=742' Tc=19.4 min CN=71 Runoff=23.67 cfs 1.750 af Runoff Area=9.270 ac 0.00% Impervious Runoff Depth=4.04"Subcatchment 5S: Post Dev 1A Flow Length=688' Tc=6.6 min CN=84 Runoff=62.94 cfs 3.119 af Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=5.36"Subcatchment 7S: Post Dev (Modified CN) Flow Length=688' Tc=6.6 min CN=96 Runoff=71.41 cfs 3.956 af Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=2.85"Subcatchment 8S: Pre-Dev 2 Flow Length=326' Tc=7.3 min CN=72 Runoff=6.52 cfs 0.319 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=3.63"Subcatchment 11S: Post Dev 1B Tc=5.0 min CN=80 Runoff=1.78 cfs 0.082 af Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=4.04"Subcatchment 13S: Post-Dev 2 Tc=5.0 min CN=84 Runoff=3.16 cfs 0.148 af Peak Elev=741.71' Storage=1.259 af Inflow=62.94 cfs 3.119 afPond 6P: Sand Filter Primary=29.62 cfs 3.060 af Secondary=5.01 cfs 0.043 af Outflow=34.64 cfs 3.104 af Inflow=30.28 cfs 3.142 afLink 12L: Analysis Point 1 Primary=30.28 cfs 3.142 af Total Runoff Area = 27.780 ac Runoff Volume = 9.373 af Average Runoff Depth = 4.05" 100.00% Pervious = 27.780 ac 0.00% Impervious = 0.000 ac Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 52HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre-Dev 1 [47] Hint: Peak is 222% of capacity of segment #3 Runoff = 23.67 cfs @ 12.13 hrs, Volume= 1.750 af, Depth= 2.76" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 25-yr Rainfall=5.83" Area (ac) CN Description * 7.600 71 7.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.4 100 0.0320 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.2 382 0.1060 5.24 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.8 260 0.0460 5.33 10.65 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 19.4 742 Total Subcatchment 1S: Pre-Dev 1 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 25-yr Rainfall=5.83" Runoff Area=7.600 ac Runoff Volume=1.750 af Runoff Depth=2.76" Flow Length=742' Tc=19.4 min CN=71 23.67 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 53HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Dev 1A [47] Hint: Peak is 929% of capacity of segment #3 Runoff = 62.94 cfs @ 11.98 hrs, Volume= 3.119 af, Depth= 4.04" Routed to Pond 6P : Sand Filter Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 25-yr Rainfall=5.83" Area (ac) CN Description * 9.270 84 9.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 5S: Post Dev 1A Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 25-yr Rainfall=5.83" Runoff Area=9.270 ac Runoff Volume=3.119 af Runoff Depth=4.04" Flow Length=688' Tc=6.6 min CN=84 62.94 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 54HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Dev (Modified CN) [47] Hint: Peak is 1054% of capacity of segment #3 Runoff = 71.41 cfs @ 11.97 hrs, Volume= 3.956 af, Depth= 5.36" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 25-yr Rainfall=5.83" Area (ac) CN Description * 8.860 96 8.860 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 7S: Post Dev (Modified CN) Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 25-yr Rainfall=5.83" Runoff Area=8.860 ac Runoff Volume=3.956 af Runoff Depth=5.36" Flow Length=688' Tc=6.6 min CN=96 71.41 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 55HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre-Dev 2 Runoff = 6.52 cfs @ 11.99 hrs, Volume= 0.319 af, Depth= 2.85" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 25-yr Rainfall=5.83" Area (ac) CN Description * 1.340 72 1.340 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 31 0.0450 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.1 179 0.0170 2.65 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.2 78 0.2590 8.19 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 38 0.1130 8.35 16.69 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 7.3 326 Total Subcatchment 8S: Pre-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 7 6 5 4 3 2 1 0 Type II 24-hr 25-yr Rainfall=5.83" Runoff Area=1.340 ac Runoff Volume=0.319 af Runoff Depth=2.85" Flow Length=326' Tc=7.3 min CN=72 6.52 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 56HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: Post Dev 1B Runoff = 1.78 cfs @ 11.96 hrs, Volume= 0.082 af, Depth= 3.63" Routed to Link 12L : Analysis Point 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 25-yr Rainfall=5.83" Area (ac) CN Description * 0.270 80 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 11S: Post Dev 1B Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 1 0 Type II 24-hr 25-yr Rainfall=5.83" Runoff Area=0.270 ac Runoff Volume=0.082 af Runoff Depth=3.63" Tc=5.0 min CN=80 1.78 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 57HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post-Dev 2 Runoff = 3.16 cfs @ 11.96 hrs, Volume= 0.148 af, Depth= 4.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 25-yr Rainfall=5.83" Area (ac) CN Description * 0.440 84 0.440 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 13S: Post-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 3 2 1 0 Type II 24-hr 25-yr Rainfall=5.83" Runoff Area=0.440 ac Runoff Volume=0.148 af Runoff Depth=4.04" Tc=5.0 min CN=84 3.16 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 58HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Pond 6P: Sand Filter Inflow Area = 9.270 ac, 0.00% Impervious, Inflow Depth = 4.04" for 25-yr event Inflow = 62.94 cfs @ 11.98 hrs, Volume= 3.119 af Outflow = 34.64 cfs @ 12.06 hrs, Volume= 3.104 af, Atten= 45%, Lag= 5.1 min Primary = 29.62 cfs @ 12.06 hrs, Volume= 3.060 af Routed to Link 12L : Analysis Point 1 Secondary = 5.01 cfs @ 12.06 hrs, Volume= 0.043 af Routed to nonexistent node 7L Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Peak Elev= 741.71' @ 12.06 hrs Surf.Area= 0.515 ac Storage= 1.259 af Plug-Flow detention time= 289.9 min calculated for 3.104 af (100% of inflow) Center-of-Mass det. time= 286.8 min ( 1,088.8 - 802.0 ) Volume Invert Avail.Storage Storage Description #1 739.00' 1.953 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 739.00 0.414 0.000 0.000 740.00 0.450 0.432 0.432 741.00 0.487 0.468 0.900 742.00 0.526 0.506 1.407 743.00 0.566 0.546 1.953 Device Routing Invert Outlet Devices #1 Primary 737.00'30.0" Round Culvert L= 70.4' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 739.00'Special & User-Defined Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Disch. (cfs) 0.000 0.102 0.142 0.183 0.224 0.264 0.305 0.346 #3 Device 1 739.50'24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 740.75'24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 741.25'4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area) Limited to weir flow at low heads #6 Secondary 741.50'20.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 59HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=29.56 cfs @ 12.06 hrs HW=741.71' (Free Discharge) 1=Culvert (Passes 29.56 cfs of 49.42 cfs potential flow) 2=Special & User-Defined (Custom Controls 0.17 cfs) 3=Orifice/Grate (Orifice Controls 8.79 cfs @ 6.59 fps) 4=Orifice/Grate (Orifice Controls 4.05 cfs @ 4.05 fps) 5=Orifice/Grate (Weir Controls 16.54 cfs @ 2.23 fps) Secondary OutFlow Max=4.95 cfs @ 12.06 hrs HW=741.71' (Free Discharge) 6=Broad-Crested Rectangular Weir (Weir Controls 4.95 cfs @ 1.15 fps) Pond 6P: Sand Filter Inflow Outflow Primary Secondary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=9.270 ac Peak Elev=741.71' Storage=1.259 af 62.94 cfs 34.64 cfs 29.62 cfs 5.01 cfs Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 60HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pond 6P: Sand Filter Total Primary Secondary Stage-Discharge Discharge (cfs) 550500450400350300250200150100500 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Special & User-Defined Orifice/Grate Orifice/Grate Orifice/Grate Broad-Crested Rectangular Weir Pond 6P: Sand Filter Surface Storage Stage-Area-Storage Storage (acre-feet) 10 Surface/Horizontal/Wetted Area (acres) 0.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Custom Stage Data Sennebogen - Sand Filter Design Type II 24-hr 25-yr Rainfall=5.83"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 61HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Link 12L: Analysis Point 1 Inflow Area = 9.540 ac, 0.00% Impervious, Inflow Depth > 3.95" for 25-yr event Inflow = 30.28 cfs @ 12.06 hrs, Volume= 3.142 af Primary = 30.28 cfs @ 12.06 hrs, Volume= 3.142 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Link 12L: Analysis Point 1 Inflow Primary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=9.540 ac 30.28 cfs 30.28 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 62HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=3.36"Subcatchment 1S: Pre-Dev 1 Flow Length=742' Tc=19.4 min CN=71 Runoff=28.91 cfs 2.131 af Runoff Area=9.270 ac 0.00% Impervious Runoff Depth=4.73"Subcatchment 5S: Post Dev 1A Flow Length=688' Tc=6.6 min CN=84 Runoff=73.11 cfs 3.656 af Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=6.10"Subcatchment 7S: Post Dev (Modified CN) Flow Length=688' Tc=6.6 min CN=96 Runoff=80.72 cfs 4.500 af Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=3.47"Subcatchment 8S: Pre-Dev 2 Flow Length=326' Tc=7.3 min CN=72 Runoff=7.89 cfs 0.387 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=4.30"Subcatchment 11S: Post Dev 1B Tc=5.0 min CN=80 Runoff=2.09 cfs 0.097 af Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=4.73"Subcatchment 13S: Post-Dev 2 Tc=5.0 min CN=84 Runoff=3.66 cfs 0.174 af Peak Elev=741.87' Storage=1.340 af Inflow=73.11 cfs 3.656 afPond 6P: Sand Filter Primary=39.49 cfs 3.518 af Secondary=11.58 cfs 0.122 af Outflow=51.07 cfs 3.641 af Inflow=40.56 cfs 3.615 afLink 12L: Analysis Point 1 Primary=40.56 cfs 3.615 af Total Runoff Area = 27.780 ac Runoff Volume = 10.944 af Average Runoff Depth = 4.73" 100.00% Pervious = 27.780 ac 0.00% Impervious = 0.000 ac Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 63HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre-Dev 1 [47] Hint: Peak is 271% of capacity of segment #3 Runoff = 28.91 cfs @ 12.12 hrs, Volume= 2.131 af, Depth= 3.36" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 50-yr Rainfall=6.57" Area (ac) CN Description * 7.600 71 7.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.4 100 0.0320 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.2 382 0.1060 5.24 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.8 260 0.0460 5.33 10.65 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 19.4 742 Total Subcatchment 1S: Pre-Dev 1 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 50-yr Rainfall=6.57" Runoff Area=7.600 ac Runoff Volume=2.131 af Runoff Depth=3.36" Flow Length=742' Tc=19.4 min CN=71 28.91 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 64HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Dev 1A [47] Hint: Peak is 1079% of capacity of segment #3 Runoff = 73.11 cfs @ 11.98 hrs, Volume= 3.656 af, Depth= 4.73" Routed to Pond 6P : Sand Filter Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 50-yr Rainfall=6.57" Area (ac) CN Description * 9.270 84 9.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 5S: Post Dev 1A Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 50-yr Rainfall=6.57" Runoff Area=9.270 ac Runoff Volume=3.656 af Runoff Depth=4.73" Flow Length=688' Tc=6.6 min CN=84 73.11 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 65HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Dev (Modified CN) [47] Hint: Peak is 1191% of capacity of segment #3 Runoff = 80.72 cfs @ 11.97 hrs, Volume= 4.500 af, Depth= 6.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 50-yr Rainfall=6.57" Area (ac) CN Description * 8.860 96 8.860 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 7S: Post Dev (Modified CN) Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 50-yr Rainfall=6.57" Runoff Area=8.860 ac Runoff Volume=4.500 af Runoff Depth=6.10" Flow Length=688' Tc=6.6 min CN=96 80.72 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 66HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre-Dev 2 Runoff = 7.89 cfs @ 11.99 hrs, Volume= 0.387 af, Depth= 3.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 50-yr Rainfall=6.57" Area (ac) CN Description * 1.340 72 1.340 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 31 0.0450 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.1 179 0.0170 2.65 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.2 78 0.2590 8.19 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 38 0.1130 8.35 16.69 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 7.3 326 Total Subcatchment 8S: Pre-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 8 7 6 5 4 3 2 1 0 Type II 24-hr 50-yr Rainfall=6.57" Runoff Area=1.340 ac Runoff Volume=0.387 af Runoff Depth=3.47" Flow Length=326' Tc=7.3 min CN=72 7.89 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 67HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: Post Dev 1B Runoff = 2.09 cfs @ 11.96 hrs, Volume= 0.097 af, Depth= 4.30" Routed to Link 12L : Analysis Point 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 50-yr Rainfall=6.57" Area (ac) CN Description * 0.270 80 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 11S: Post Dev 1B Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 2 1 0 Type II 24-hr 50-yr Rainfall=6.57" Runoff Area=0.270 ac Runoff Volume=0.097 af Runoff Depth=4.30" Tc=5.0 min CN=80 2.09 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 68HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post-Dev 2 Runoff = 3.66 cfs @ 11.96 hrs, Volume= 0.174 af, Depth= 4.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 50-yr Rainfall=6.57" Area (ac) CN Description * 0.440 84 0.440 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 13S: Post-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 50-yr Rainfall=6.57" Runoff Area=0.440 ac Runoff Volume=0.174 af Runoff Depth=4.73" Tc=5.0 min CN=84 3.66 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 69HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Pond 6P: Sand Filter Inflow Area = 9.270 ac, 0.00% Impervious, Inflow Depth = 4.73" for 50-yr event Inflow = 73.11 cfs @ 11.98 hrs, Volume= 3.656 af Outflow = 51.07 cfs @ 12.04 hrs, Volume= 3.641 af, Atten= 30%, Lag= 3.9 min Primary = 39.49 cfs @ 12.04 hrs, Volume= 3.518 af Routed to Link 12L : Analysis Point 1 Secondary = 11.58 cfs @ 12.04 hrs, Volume= 0.122 af Routed to nonexistent node 7L Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Peak Elev= 741.87' @ 12.04 hrs Surf.Area= 0.521 ac Storage= 1.340 af Plug-Flow detention time= 254.0 min calculated for 3.640 af (100% of inflow) Center-of-Mass det. time= 251.8 min ( 1,049.3 - 797.5 ) Volume Invert Avail.Storage Storage Description #1 739.00' 1.953 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 739.00 0.414 0.000 0.000 740.00 0.450 0.432 0.432 741.00 0.487 0.468 0.900 742.00 0.526 0.506 1.407 743.00 0.566 0.546 1.953 Device Routing Invert Outlet Devices #1 Primary 737.00'30.0" Round Culvert L= 70.4' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 739.00'Special & User-Defined Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Disch. (cfs) 0.000 0.102 0.142 0.183 0.224 0.264 0.305 0.346 #3 Device 1 739.50'24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 740.75'24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 741.25'4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area) Limited to weir flow at low heads #6 Secondary 741.50'20.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 70HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=39.43 cfs @ 12.04 hrs HW=741.87' (Free Discharge) 1=Culvert (Passes 39.43 cfs of 50.73 cfs potential flow) 2=Special & User-Defined (Custom Controls 0.18 cfs) 3=Orifice/Grate (Orifice Controls 9.15 cfs @ 6.87 fps) 4=Orifice/Grate (Orifice Controls 4.48 cfs @ 4.48 fps) 5=Orifice/Grate (Weir Controls 25.62 cfs @ 2.58 fps) Secondary OutFlow Max=11.54 cfs @ 12.04 hrs HW=741.87' (Free Discharge) 6=Broad-Crested Rectangular Weir (Weir Controls 11.54 cfs @ 1.55 fps) Pond 6P: Sand Filter Inflow Outflow Primary Secondary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=9.270 ac Peak Elev=741.87' Storage=1.340 af 73.11 cfs 51.07 cfs 39.49 cfs 11.58 cfs Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 71HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pond 6P: Sand Filter Total Primary Secondary Stage-Discharge Discharge (cfs) 550500450400350300250200150100500 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Special & User-Defined Orifice/Grate Orifice/Grate Orifice/Grate Broad-Crested Rectangular Weir Pond 6P: Sand Filter Surface Storage Stage-Area-Storage Storage (acre-feet) 10 Surface/Horizontal/Wetted Area (acres) 0.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Custom Stage Data Sennebogen - Sand Filter Design Type II 24-hr 50-yr Rainfall=6.57"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 72HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Link 12L: Analysis Point 1 Inflow Area = 9.540 ac, 0.00% Impervious, Inflow Depth = 4.55" for 50-yr event Inflow = 40.56 cfs @ 12.04 hrs, Volume= 3.615 af Primary = 40.56 cfs @ 12.04 hrs, Volume= 3.615 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Link 12L: Analysis Point 1 Inflow Primary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=9.540 ac 40.56 cfs 40.56 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 73HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Time span=0.00-160.00 hrs, dt=0.01 hrs, 16001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=7.600 ac 0.00% Impervious Runoff Depth=3.99"Subcatchment 1S: Pre-Dev 1 Flow Length=742' Tc=19.4 min CN=71 Runoff=34.36 cfs 2.530 af Runoff Area=9.270 ac 0.00% Impervious Runoff Depth=5.44"Subcatchment 5S: Post Dev 1A Flow Length=688' Tc=6.6 min CN=84 Runoff=83.39 cfs 4.206 af Runoff Area=8.860 ac 0.00% Impervious Runoff Depth=6.84"Subcatchment 7S: Post Dev (Modified CN) Flow Length=688' Tc=6.6 min CN=96 Runoff=90.13 cfs 5.052 af Runoff Area=1.340 ac 0.00% Impervious Runoff Depth=4.10"Subcatchment 8S: Pre-Dev 2 Flow Length=326' Tc=7.3 min CN=72 Runoff=9.30 cfs 0.458 af Runoff Area=0.270 ac 0.00% Impervious Runoff Depth=4.99"Subcatchment 11S: Post Dev 1B Tc=5.0 min CN=80 Runoff=2.40 cfs 0.112 af Runoff Area=0.440 ac 0.00% Impervious Runoff Depth=5.44"Subcatchment 13S: Post-Dev 2 Tc=5.0 min CN=84 Runoff=4.18 cfs 0.200 af Peak Elev=741.99' Storage=1.404 af Inflow=83.39 cfs 4.206 afPond 6P: Sand Filter Primary=47.39 cfs 3.976 af Secondary=18.22 cfs 0.215 af Outflow=65.62 cfs 4.191 af Inflow=48.88 cfs 4.088 afLink 12L: Analysis Point 1 Primary=48.88 cfs 4.088 af Total Runoff Area = 27.780 ac Runoff Volume = 12.558 af Average Runoff Depth = 5.42" 100.00% Pervious = 27.780 ac 0.00% Impervious = 0.000 ac Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 74HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: Pre-Dev 1 [47] Hint: Peak is 323% of capacity of segment #3 Runoff = 34.36 cfs @ 12.12 hrs, Volume= 2.530 af, Depth= 3.99" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 100-yr Rainfall=7.32" Area (ac) CN Description * 7.600 71 7.600 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.4 100 0.0320 0.10 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.2 382 0.1060 5.24 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.8 260 0.0460 5.33 10.65 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 19.4 742 Total Subcatchment 1S: Pre-Dev 1 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 100-yr Rainfall=7.32" Runoff Area=7.600 ac Runoff Volume=2.530 af Runoff Depth=3.99" Flow Length=742' Tc=19.4 min CN=71 34.36 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 75HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 5S: Post Dev 1A [47] Hint: Peak is 1231% of capacity of segment #3 Runoff = 83.39 cfs @ 11.98 hrs, Volume= 4.206 af, Depth= 5.44" Routed to Pond 6P : Sand Filter Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 100-yr Rainfall=7.32" Area (ac) CN Description * 9.270 84 9.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 5S: Post Dev 1A Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 100-yr Rainfall=7.32" Runoff Area=9.270 ac Runoff Volume=4.206 af Runoff Depth=5.44" Flow Length=688' Tc=6.6 min CN=84 83.39 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 76HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 7S: Post Dev (Modified CN) [47] Hint: Peak is 1330% of capacity of segment #3 Runoff = 90.13 cfs @ 11.97 hrs, Volume= 5.052 af, Depth= 6.84" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 100-yr Rainfall=7.32" Area (ac) CN Description * 8.860 96 8.860 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.2840 0.20 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.5 202 0.0130 2.31 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.3 441 0.0110 5.52 6.78 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 6.6 688 Total Subcatchment 7S: Post Dev (Modified CN) Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 100-yr Rainfall=7.32" Runoff Area=8.860 ac Runoff Volume=5.052 af Runoff Depth=6.84" Flow Length=688' Tc=6.6 min CN=96 90.13 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 77HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 8S: Pre-Dev 2 Runoff = 9.30 cfs @ 11.99 hrs, Volume= 0.458 af, Depth= 4.10" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 100-yr Rainfall=7.32" Area (ac) CN Description * 1.340 72 1.340 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 31 0.0450 0.09 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.36" 1.1 179 0.0170 2.65 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.2 78 0.2590 8.19 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 0.1 38 0.1130 8.35 16.69 Trap/Vee/Rect Channel Flow, Bot.W=0.00' D=1.00' Z= 2.0 '/' Top.W=4.00' n= 0.035 7.3 326 Total Subcatchment 8S: Pre-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.32" Runoff Area=1.340 ac Runoff Volume=0.458 af Runoff Depth=4.10" Flow Length=326' Tc=7.3 min CN=72 9.30 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 78HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 11S: Post Dev 1B Runoff = 2.40 cfs @ 11.96 hrs, Volume= 0.112 af, Depth= 4.99" Routed to Link 12L : Analysis Point 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 100-yr Rainfall=7.32" Area (ac) CN Description * 0.270 80 0.270 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 11S: Post Dev 1B Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 2 1 0 Type II 24-hr 100-yr Rainfall=7.32" Runoff Area=0.270 ac Runoff Volume=0.112 af Runoff Depth=4.99" Tc=5.0 min CN=80 2.40 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 79HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Post-Dev 2 Runoff = 4.18 cfs @ 11.96 hrs, Volume= 0.200 af, Depth= 5.44" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Type II 24-hr 100-yr Rainfall=7.32" Area (ac) CN Description * 0.440 84 0.440 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Subcatchment 13S: Post-Dev 2 Runoff Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 4 3 2 1 0 Type II 24-hr 100-yr Rainfall=7.32" Runoff Area=0.440 ac Runoff Volume=0.200 af Runoff Depth=5.44" Tc=5.0 min CN=84 4.18 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 80HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Pond 6P: Sand Filter Inflow Area = 9.270 ac, 0.00% Impervious, Inflow Depth = 5.44" for 100-yr event Inflow = 83.39 cfs @ 11.98 hrs, Volume= 4.206 af Outflow = 65.62 cfs @ 12.03 hrs, Volume= 4.191 af, Atten= 21%, Lag= 3.2 min Primary = 47.39 cfs @ 12.03 hrs, Volume= 3.976 af Routed to Link 12L : Analysis Point 1 Secondary = 18.22 cfs @ 12.03 hrs, Volume= 0.215 af Routed to nonexistent node 7L Routing by Stor-Ind method, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Peak Elev= 741.99' @ 12.03 hrs Surf.Area= 0.526 ac Storage= 1.404 af Plug-Flow detention time= 226.8 min calculated for 4.190 af (100% of inflow) Center-of-Mass det. time= 224.9 min ( 1,018.5 - 793.6 ) Volume Invert Avail.Storage Storage Description #1 739.00' 1.953 af Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 739.00 0.414 0.000 0.000 740.00 0.450 0.432 0.432 741.00 0.487 0.468 0.900 742.00 0.526 0.506 1.407 743.00 0.566 0.546 1.953 Device Routing Invert Outlet Devices #1 Primary 737.00'30.0" Round Culvert L= 70.4' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 737.00' / 736.30' S= 0.0099 '/' Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 739.00'Special & User-Defined Head (feet) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 Disch. (cfs) 0.000 0.102 0.142 0.183 0.224 0.264 0.305 0.346 #3 Device 1 739.50'24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Device 1 740.75'24.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Device 1 741.25'4.0" x 4.0" Horiz. Orifice/Grate X 9.00 columns X 8 rows C= 0.600 in 48.0" x 48.0" Grate (50% open area) Limited to weir flow at low heads #6 Secondary 741.50'20.0' long x 10.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 81HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Primary OutFlow Max=47.61 cfs @ 12.03 hrs HW=741.99' (Free Discharge) 1=Culvert (Passes 47.61 cfs of 51.73 cfs potential flow) 2=Special & User-Defined (Custom Controls 0.18 cfs) 3=Orifice/Grate (Orifice Controls 9.43 cfs @ 7.07 fps) 4=Orifice/Grate (Orifice Controls 4.79 cfs @ 4.79 fps) 5=Orifice/Grate (Orifice Controls 33.22 cfs @ 4.15 fps) Secondary OutFlow Max=18.21 cfs @ 12.03 hrs HW=741.99' (Free Discharge) 6=Broad-Crested Rectangular Weir (Weir Controls 18.21 cfs @ 1.84 fps) Pond 6P: Sand Filter Inflow Outflow Primary Secondary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=9.270 ac Peak Elev=741.99' Storage=1.404 af 83.39 cfs 65.62 cfs 47.39 cfs 18.22 cfs Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 82HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Pond 6P: Sand Filter Total Primary Secondary Stage-Discharge Discharge (cfs) 550500450400350300250200150100500 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Special & User-Defined Orifice/Grate Orifice/Grate Orifice/Grate Broad-Crested Rectangular Weir Pond 6P: Sand Filter Surface Storage Stage-Area-Storage Storage (acre-feet) 10 Surface/Horizontal/Wetted Area (acres) 0.550.50.450.40.350.30.250.20.150.10.050 El e v a t i o n ( f e e t ) 746 745 744 743 742 741 740 739 Custom Stage Data Sennebogen - Sand Filter Design Type II 24-hr 100-yr Rainfall=7.32"8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 83HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Summary for Link 12L: Analysis Point 1 Inflow Area = 9.540 ac, 0.00% Impervious, Inflow Depth = 5.14" for 100-yr event Inflow = 48.88 cfs @ 12.03 hrs, Volume= 4.088 af Primary = 48.88 cfs @ 12.03 hrs, Volume= 4.088 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-160.00 hrs, dt= 0.01 hrs Link 12L: Analysis Point 1 Inflow Primary Hydrograph Time (hours) 1601501401301201101009080706050403020100 Fl o w ( c f s ) 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=9.540 ac 48.88 cfs 48.88 cfs Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 84HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment 1S: Pre-Dev 1 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 1-inch 1.00 0.01 0.005 0.01 1-yr 2.78 4.74 0.404 0.64 2-yr 3.36 7.80 0.618 0.98 10-yr 4.91 17.38 1.298 2.05 25-yr 5.83 23.67 1.750 2.76 50-yr 6.57 28.91 2.131 3.36 100-yr 7.32 34.36 2.530 3.99 Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 85HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment 5S: Post Dev 1A Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 1-inch 1.00 2.02 0.117 0.15 1-yr 2.78 21.69 1.033 1.34 2-yr 3.36 29.30 1.404 1.82 10-yr 4.91 50.31 2.463 3.19 25-yr 5.83 62.94 3.119 4.04 50-yr 6.57 73.11 3.656 4.73 100-yr 7.32 83.39 4.206 5.44 Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 86HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment 7S: Post Dev (Modified CN) Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 1-inch 1.00 9.55 0.465 0.63 1-yr 2.78 32.72 1.725 2.34 2-yr 3.36 40.15 2.146 2.91 10-yr 4.91 59.81 3.280 4.44 25-yr 5.83 71.41 3.956 5.36 50-yr 6.57 80.72 4.500 6.10 100-yr 7.32 90.13 5.052 6.84 Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 87HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment 8S: Pre-Dev 2 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 1-inch 1.00 0.00 0.001 0.01 1-yr 2.78 1.47 0.076 0.68 2-yr 3.36 2.31 0.115 1.03 10-yr 4.91 4.87 0.238 2.13 25-yr 5.83 6.52 0.319 2.85 50-yr 6.57 7.89 0.387 3.47 100-yr 7.32 9.30 0.458 4.10 Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 88HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment 11S: Post Dev 1B Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 1-inch 1.00 0.02 0.002 0.08 1-yr 2.78 0.55 0.024 1.09 2-yr 3.36 0.77 0.034 1.53 10-yr 4.91 1.39 0.063 2.81 25-yr 5.83 1.78 0.082 3.63 50-yr 6.57 2.09 0.097 4.30 100-yr 7.32 2.40 0.112 4.99 Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 89HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Subcatchment 13S: Post-Dev 2 Event Rainfall (inches) Runoff (cfs) Volume (acre-feet) Depth (inches) 1-inch 1.00 0.10 0.006 0.15 1-yr 2.78 1.09 0.049 1.34 2-yr 3.36 1.47 0.067 1.82 10-yr 4.91 2.52 0.117 3.19 25-yr 5.83 3.16 0.148 4.04 50-yr 6.57 3.66 0.174 4.73 100-yr 7.32 4.18 0.200 5.44 Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 90HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Pond 6P: Sand Filter Event Inflow (cfs) Outflow (cfs) Primary (cfs) Secondary (cfs) Elevation (feet) Storage (acre-feet) 1-inch 2.02 0.02 0.02 0.00 739.23 0.098 1-yr 21.69 3.00 3.00 0.00 740.09 0.472 2-yr 29.30 5.09 5.09 0.00 740.45 0.638 10-yr 50.31 14.54 14.54 0.00 741.41 1.102 25-yr 62.94 34.64 29.62 5.01 741.71 1.259 50-yr 73.11 51.07 39.49 11.58 741.87 1.340 100-yr 83.39 65.62 47.39 18.22 741.99 1.404 Sennebogen - Sand Filter Design Multi-Event Tables8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP Page 91HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC Events for Link 12L: Analysis Point 1 Event Inflow (cfs) Primary (cfs) Elevation (feet) 1-inch 0.03 0.03 0.00 1-yr 3.07 3.07 0.00 2-yr 5.20 5.20 0.00 10-yr 14.81 14.81 0.00 25-yr 30.28 30.28 0.00 50-yr 40.56 40.56 0.00 100-yr 48.88 48.88 0.00 Sennebogen - Sand Filter Design Table of Contents8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC TABLE OF CONTENTS Project Reports 1 Routing Diagram 2 Rainfall Events Listing 3 Area Listing (all nodes) 4 Soil Listing (all nodes) 5 Ground Covers (all nodes) 6 Pipe Listing (all nodes) 1-inch Event 7 Node Listing 8 Subcat 1S: Pre-Dev 1 9 Subcat 5S: Post Dev 1A 10 Subcat 7S: Post Dev (Modified CN) 11 Subcat 8S: Pre-Dev 2 12 Subcat 11S: Post Dev 1B 13 Subcat 13S: Post-Dev 2 14 Pond 6P: Sand Filter 17 Link 12L: Analysis Point 1 1-yr Event 18 Node Listing 19 Subcat 1S: Pre-Dev 1 20 Subcat 5S: Post Dev 1A 21 Subcat 7S: Post Dev (Modified CN) 22 Subcat 8S: Pre-Dev 2 23 Subcat 11S: Post Dev 1B 24 Subcat 13S: Post-Dev 2 25 Pond 6P: Sand Filter 28 Link 12L: Analysis Point 1 2-yr Event 29 Node Listing 30 Subcat 1S: Pre-Dev 1 31 Subcat 5S: Post Dev 1A 32 Subcat 7S: Post Dev (Modified CN) 33 Subcat 8S: Pre-Dev 2 34 Subcat 11S: Post Dev 1B 35 Subcat 13S: Post-Dev 2 36 Pond 6P: Sand Filter 39 Link 12L: Analysis Point 1 10-yr Event 40 Node Listing 41 Subcat 1S: Pre-Dev 1 42 Subcat 5S: Post Dev 1A 43 Subcat 7S: Post Dev (Modified CN) 44 Subcat 8S: Pre-Dev 2 45 Subcat 11S: Post Dev 1B 46 Subcat 13S: Post-Dev 2 Sennebogen - Sand Filter Design Table of Contents8189-Sand Filter-Detailed Design Printed 4/3/2024Prepared by CES Group Engineers, LLP HydroCAD® 10.20-4b s/n 10182 © 2023 HydroCAD Software Solutions LLC 47 Pond 6P: Sand Filter 50 Link 12L: Analysis Point 1 25-yr Event 51 Node Listing 52 Subcat 1S: Pre-Dev 1 53 Subcat 5S: Post Dev 1A 54 Subcat 7S: Post Dev (Modified CN) 55 Subcat 8S: Pre-Dev 2 56 Subcat 11S: Post Dev 1B 57 Subcat 13S: Post-Dev 2 58 Pond 6P: Sand Filter 61 Link 12L: Analysis Point 1 50-yr Event 62 Node Listing 63 Subcat 1S: Pre-Dev 1 64 Subcat 5S: Post Dev 1A 65 Subcat 7S: Post Dev (Modified CN) 66 Subcat 8S: Pre-Dev 2 67 Subcat 11S: Post Dev 1B 68 Subcat 13S: Post-Dev 2 69 Pond 6P: Sand Filter 72 Link 12L: Analysis Point 1 100-yr Event 73 Node Listing 74 Subcat 1S: Pre-Dev 1 75 Subcat 5S: Post Dev 1A 76 Subcat 7S: Post Dev (Modified CN) 77 Subcat 8S: Pre-Dev 2 78 Subcat 11S: Post Dev 1B 79 Subcat 13S: Post-Dev 2 80 Pond 6P: Sand Filter 83 Link 12L: Analysis Point 1 Multi-Event Tables 84 Subcat 1S: Pre-Dev 1 85 Subcat 5S: Post Dev 1A 86 Subcat 7S: Post Dev (Modified CN) 87 Subcat 8S: Pre-Dev 2 88 Subcat 11S: Post Dev 1B 89 Subcat 13S: Post-Dev 2 90 Pond 6P: Sand Filter 91 Link 12L: Analysis Point 1 Exhibit 6 Soil Maps Soil Map—Lincoln County, North Carolina (Post Dev DA) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/2/2023 Page 1 of 3 39 1 9 5 5 0 39 1 9 5 9 0 39 1 9 6 3 0 39 1 9 6 7 0 39 1 9 7 1 0 39 1 9 7 5 0 39 1 9 7 9 0 39 1 9 5 5 0 39 1 9 5 9 0 39 1 9 6 3 0 39 1 9 6 7 0 39 1 9 7 1 0 39 1 9 7 5 0 39 1 9 7 9 0 498240 498280 498320 498360 498400 498440 498480 498520 498560 498600 498640 498240 498280 498320 498360 498400 498440 498480 498520 498560 498600 498640 35° 25' 17'' N 81 ° 1 ' 9 ' ' W 35° 25' 17'' N 81 ° 0 ' 5 3 ' ' W 35° 25' 9'' N 81 ° 1 ' 9 ' ' W 35° 25' 9'' N 81 ° 0 ' 5 3 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84 0 50 100 200 300 Feet 0 25 50 100 150 Meters Map Scale: 1:1,870 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Lincoln County, North Carolina Survey Area Data: Version 28, Sep 13, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 22, 2022—May 10, 2022 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—Lincoln County, North Carolina (Post Dev DA) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/2/2023 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI CeB2 Cecil sandy clay loam, 2 to 8 percent slopes, moderately eroded 7.1 79.9% PeC2 Pacolet sandy clay loam, 8 to 15 percent slopes, moderately eroded 0.0 0.0% WyC Wynott-Winnsboro-Rowan complex, 8 to 15 percent slopes 1.8 20.1% Totals for Area of Interest 8.9 100.0% Soil Map—Lincoln County, North Carolina Post Dev DA Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/2/2023 Page 3 of 3 Hydrologic Soil Group—Lincoln County, North Carolina (HSG Map) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/2/2023 Page 1 of 4 39 1 9 5 5 0 39 1 9 5 9 0 39 1 9 6 3 0 39 1 9 6 7 0 39 1 9 7 1 0 39 1 9 7 5 0 39 1 9 7 9 0 39 1 9 5 5 0 39 1 9 5 9 0 39 1 9 6 3 0 39 1 9 6 7 0 39 1 9 7 1 0 39 1 9 7 5 0 39 1 9 7 9 0 498240 498280 498320 498360 498400 498440 498480 498520 498560 498600 498640 498240 498280 498320 498360 498400 498440 498480 498520 498560 498600 498640 35° 25' 17'' N 81 ° 1 ' 9 ' ' W 35° 25' 17'' N 81 ° 0 ' 5 3 ' ' W 35° 25' 9'' N 81 ° 1 ' 9 ' ' W 35° 25' 9'' N 81 ° 0 ' 5 3 ' ' W N Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84 0 50 100 200 300 Feet 0 25 50 100 150 Meters Map Scale: 1:1,870 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons A A/D B B/D C C/D D Not rated or not available Soil Rating Lines A A/D B B/D C C/D D Not rated or not available Soil Rating Points A A/D B B/D C C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Lincoln County, North Carolina Survey Area Data: Version 28, Sep 13, 2023 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 22, 2022—May 10, 2022 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Hydrologic Soil Group—Lincoln County, North Carolina (HSG Map) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/2/2023 Page 2 of 4 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI CeB2 Cecil sandy clay loam, 2 to 8 percent slopes, moderately eroded B 7.1 79.9% PeC2 Pacolet sandy clay loam, 8 to 15 percent slopes, moderately eroded B 0.0 0.0% WyC Wynott-Winnsboro- Rowan complex, 8 to 15 percent slopes D 1.8 20.1% Totals for Area of Interest 8.9 100.0% Hydrologic Soil Group—Lincoln County, North Carolina HSG Map Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/2/2023 Page 3 of 4 Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff: None Specified Tie-break Rule: Higher Hydrologic Soil Group—Lincoln County, North Carolina HSG Map Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 11/2/2023 Page 4 of 4