20051881 Ver 1_Stormwater Info_20051010

Wetland Delineation Performed By: Soil & Environmental Consultants, PA
236 LePhillip Ct., Suite C
Concord, North Carolina 28025
[phone]
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: Barrow Road Date: 10/21103
Applicant/Owner. Faith Properties County: Guilford
Investigator: W. Overby, A. Rollans State: NC

Do Normal Circumstances exist on the site? X Yes No Community ID: Mix-Pine-Hardwood
Is the site significantly disturbed (Atypical Situation)? Yes X No Transect ID:
Is the area a potential Problem Area? Yes X No Plot ID: Upland
(If needed, explain on reverse.)
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1. Pinus viriginana Tree FACU 9. Pinus echinata Tree FACU
2. Liriodendron tulipifera Tree FAC+ 10.
3. Liquidambar styraciflua Tree FAC 11.
4. Juniperus virginiana Tree FACU- 12.
5. Rubus argutus Herb FACU 13.
6. Acer rubrum Tree FAC 14.
7. Lonicera japonica Herb FAC- 15.
8. Quercus alba Tree FACU 16.
Percent of Dominant Species that are OBL, FACW, or FAC
(excluding FAC-): 40
Remarks: Much of upland in pasture (fescue) or cultivated field.
HYDROLOGY
_ Recorded Data (Describe in Remarks):
Stream, Lake or Tide Gauge
Aerial Photographs
_ Other
X No Recorded Data Available Wetland Hydrology Indicators:
Primary Indicators:
Inundated
Saturated in Upper 12 Inches
Sediment Deposits
Drainage Patterns in Wetlands
Field Observations: Secondary Indicators (2 or more required):
_ Oxidized Root Channels in Upper 12 Inches
Depth of Surface Water: N/A (in.) Water-Stained Leaves
_ Local Soil Survey Data
Depth to Free Water in Pit: N/A (in.) FAC-Neutral Test
_ Other (Explain in Remarks)
Depth to Saturated Soil: N/A (in.)
Remarks:
Wetland Delineation Performed By: Soil & Environmental Consultants, PA
236 LePhillip Ct., Suite C
Concord, North Carolina 28025
[phone]
Project/Site: Barrow Road Plot ID: Upla.-d
cnn c
Map Unit Name Drainage Class: Well
(Series and Phase): Enon Field Observations
Taxonomy (Subgroup): Ultic Hapludalf Confirm Mapped Type? x Yes _ No
Profile Description:
Depth Matrix Color Mottle Color Mottle Texture, Concretions,
inches Horizon (Munsell Moist) (Munsell Moist) Abundance/Contrast Structure, etc.
0-4 Ap 10YR 4/2 Sand Loam
4-12 Bt1 2.5Y 5/4 Sand clay loam
12+ Bt2 10YR 5/8 Clay
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
L--
I
WFTI ANDS nFTFRMINATION
X
Hydrophytic Vegetation Present? Yes _ No Is this sampling point within a wetland?
Wetland Hydrology Present? Yes x No Yes x No
Hydric Soils Present? Yes x No
Remarks:
Wetland Delineation Performed By: Soil & Environmental Consultants, PA
236 LePhillip Ct., Suite C
Concord, North Carolina 28025
[phone]
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: Barrow Road Date: 10/21103
Applicant/Owner. Faith Properties County: Guilford
Investigator: W. Overby A. Rollans State: NC
Do Normal Circumstances exist on the site? X Yes No Community ID: Headwater
Is the site significantly disturbed (Atypical Situation)? Yes X No Transect ID:
Is the area a potential Problem Area? Yes X No Plot ID: Wetland
(If needed, explain on reverse.)
VP[,-PTe'nnN
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1. Juncus effusus Herb FACW 9.
2. Sambucus Canadensis Herb FACW 10.
3. Salix nigra Tree OBL 11.
4. Carex sp. Shrub FACW 12.
5. Rubus argutus Herb FACU 13.
6. Cyperus strigosis Herb FACW 14.
7. Ludwigia sp. Herb OBL 15.
8. 16.
Percent of Dominant Species that are OBL, FACW, or FAC
(excluding FAC-): 85
Remarks:
HYDROLOGY
_ Recorded Data (Describe in Remarks):
Stream, Lake or Tide Gauge
_ Aerial Photographs
Other
X No Recorded Data Available Wetland Hydrology Indicators:
Primary Indicators:
x Inundated
x Saturated in Upper 12 Inches
Sediment Deposits
Drainage Patterns in Wetlands
Field Observations: Secondary Indicators (2 or more required):
x Oxidized Root Channels in Upper 12 Inches
Depth of Surface Water: 0-2 (in.) Water-Stained Leaves
Local Soil Survey Data
Depth to Free Water in Pit: 0-12+ (in.) x FAC-Neutral Test
_ Other (Explain in Remarks)
Depth to Saturated Soil: 0-12+ (in.)
Remarks:
Wetland Delineation Performed By: Soil & Environmental Consultants, PA
236 LePhillip Ct., Suite C
Concord, North Carolina 28025
[phone]
Project/Site: Barrow Road Plot ID: wetland
JV ILJ
Map Unit Name Drainage Class: Poorly
(Series and Phase): Wehadkee Field Observations
Taxonomy (Subgroup): Fluvaquentic endoaquept Confirm Mapped Type? x Yes No
Profile Description:
Depth Matrix Color Mottle Color Mottle Texture, Concretions,
inches Horizon (Munsell Moist) (Munsell Moist) Abundance/Contrast Structure, etc.
0-4 Ap 10YR 5/2 Loam
4-12 Bg 10 YR 6/2 7.5YR 5/8 Few/Distinct Sand clay loam
Hydric Soil Indicators:
Histosol Concretions
_
Histic Epipedon High Organic Content in Surface Layer in Sandy Soils
_
Sulfidic Odor Organic Streaking in Sandy Soils
_
x Aquic Moisture Regime x Listed on Local Hydric Soils List
x Reducing Conditions x Listed on National Hydric Soils List
x Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
IAICTI AKIr10 r1CTCDAA1MAT1nkf
x
Hydrophytic Vegetation Present? - Yes No Is this sampling point within a wetland?
Wetland Hydrology Present? x Yes No x Yes No
Hydric Soils Present? x Yes No
Remarks:
L- J
1 r i 1
Wetland Delineation Performed By: Soil & Environmental Consultants, PA
236 LePhillip Ct., Suite C
Concord, North Carolina 28025
[phone]
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: Barrow Road Date: 10/21/03
Applicant/Owner. Faith Properties County: Guilford
Investigator. W. Overby, A. Rollans State: NC

Do Normal Circumstances exist on the site? X Yes No Community ID: Riparian wetlands
Is the site significantly disturbed (Atypical Situation)? Yes X No Transect ID:
Is the area a potential Problem Area? Yes X No Plot ID: wetland
(If needed, explain on reverse.)
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1. Ligustrum sinense Tree FAC 9.
2. Liriodendron tulipifera Tree FAC+ 10.
3. Liquidambar styraciflua Tree FAC 11.
4. Microstegium vimenium Herb FAC 12.
5. Smilax rotundifolia Vine FAC 13.
6. Acer rubrum Tree FAC 14.
7. Woodwardia areolata Herb OBL 15.
8. Salix nigra Tree OBL 16.
Percent of Dominant Species that are OBL, FACW, or FAC
(excluding FAC-): 100

HYDROLOGY
_ Recorded Data (Describe in Remarks):
_ Stream, Lake or Tide Gauge
_ Aerial Photographs
_ Other
X No Recorded Data Available Wetland Hydrology Indicators:
Primary Indicators:
Inundated
x Saturated in Upper 12 Inches
_ Sediment Deposits
x Drainage Patterns in Wetlands
Field Observations: Secondary Indicators (2 or more required):
x Oxidized Root Channels in Upper 12 Inches
Depth of Surface Water: 0 (in.) x Water-Stained Leaves
x Local Soil Survey Data
Depth to Free Water in Pit: 0-12 (in.) FAC-Neutral Test
Other (Explain in Remarks)
Depth to Saturated Soil: 0-12+ (in.)
Remarks:
. r I ,
Wetland Delineation Performed By: Soil & Environmental Consultants, PA
236 LePhillip Ct., Suite C
Concord, North Carolina 28025
[phone]
Project/Site: Barrow Road Plot ID: wetland
SOILS
Map Unit Name Drainage Class: Poorly
(Series and Phase): Worsham Field Observations
Taxonomy (Subgroup): Typic Endoaquult Confirm Mapped Type? x Yes No
Profile Description:
Depth Matrix Color Mottle Color Mottle Texture, Concretions,
inches Horizon (Munsell Moist) (Munsell Moist) Abundance/Contrast Structure, etc.
0-5 A 10YR 5/1 Sand Loam
4-15 Bg 10YR 6/1 10YR 5/2 Common/Distinct Clay loam
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
_
x Aquic Moisture Regime x Listed on Local Hydric Soils List
x Reducing Conditions x Listed on National Hydric Soils List
x Gleyed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
L-
I
WETLANDS DETERMINATION
X
Hydrophytic Vegetation Present? - Yes No Is this sampling point within a wetland?
Wetland Hydrology Present? x Yes No x Yes No
Hydric Soils Present? x Yes No
Remarks:
EROSION CONTROL AND STORM WATER
HYDRAULIC CALCULATIONS
FOR
PIEDMONT CROSSING TRACT •C•
MULTI-FAMILY SECTION
DEVELOPED BY.•
FAITH PROPERTIES OF THE CAROLINAS, LLC
AUGUST, 2005
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O. RIR - WATER QUlkLITY
VOU-''os 1 0 S T (rJ? 1FYATER ER lxj l
JAMESTOWN ENGINEERING GROUP, INC.
117 EAST MAIN STREET P. 0. BOX 365
JAMESTOWN, NC 27282
[phone]

EROSION CONTROL AND STORM WATER
HYDRAULIC CALCULATIONS
FOR
PIEDMONT CROSSING TRACT °C°
MULTI-FAMILY SECTION
DEVELOPED BY.•
FAITH PROPERTIES OF THE CAROLINAS, LLC
AUGUST, 2005
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1 65

JAMESTOWN ENCINEERINC GROUP, INC.
117 EAST MAIN STREET P. 0. BOX 365
JAMESTOWN, NC 27282
[phone]
JAMESTOWN ENGINEERING GROUP, INC.
117 E. MAIN STREET
JAMESTOWN, NC 27282
DESIGN OF WATER QUALITY POND NO. 4
e I. GENERAL
A. DESIGN CRITERIA
- \
.y DESIGN IS BASED UPON CITY OF HIGH POINT STORMVATER GUIDELINES
FOR VATER QUALITY AND FLOOD CONTROL. IN CONJUNCTION WITH ENVIRONMENTAL
REGULATIONS, ARTICLE A, SECTION 9-7-5 FOR WATERSHED CRITICAL AREAS.
D. SITE INFORMATION
THE PROPOSED SITE IS LOCATED VITNIN THE OAK HOLLOW GENERAL VATERSHED
GENERAL SITE DATA IS LISTED BELOW:
POND 14
SITE AREA 13.0
OFF-SITE AREA 0.00
TOTAL SITE AREA 13.00
OFF-SITE DRAINAGE AREA 0.00
SITE DRAINAGE AREA 13
DISTURBED AREA 12
S UNITS PROPOSED (MULTI-FAMILY) 51.5
BARROW ROAD WIDENING (FUTURE) 0.69 AC
IMPERVIOUS AREA
SFzUHIT (MULTI-FAMILY) 2200
' IMPERVIOUS AREA (BARROW RD) 0.69
IMPERVIOUS AREA (MULTI- FAHI 2.60
STREETS, SIDEVALKS. POOL 1.67
0 AD.IACENT LOT 9 .00 AC 0.00
TOTAL 4.96
1 i BUILT UPON (FOR SITE DRAINAGE AREA) 38.15i
% BUILT UPON (FOR TOTAL SITE AREA) 38.1S%
DU/ACRE (SITE) 4.0
' IN ACCORDANCE WITH TABLE 7-S-1 A VET DETENTION POND IS REQUIRED
C. VET POND INFORMATION/REQUIREMENTS
VOLUME REQUIREMENTS OF POND 1
' 38.2: IMPERVIOUS e 3.2 ft 1.60/ OF DRAINAGE AREA
POOL SURFACE AREA REQUIRED .016 x 13.00 x 43560 9057 SF
1/8 PERM SED STORAGE .125 x 13.00 x 3630 - 5899 CF
• 112 TEMP SED STORAGE S00 r. 12.00 x 3630 21780 CF
TOTALSEDIMENT STORAGE VOLUME REQUIRED 27679 CF
RUNOFF VOLUME - 1.Oin x Rv x DA vhere Rv - 0.05 + 0.009 (I)
TEMPORARY VOLUME - 1.0 in x 0.39 x 13.00 • 10563 CF

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D OF ANALYSIS
INFLOW HYDROGRAPHS: SHALL WATERSHED METHOD
PEAK INFLOWS: RATIONAL METHOD
' POND ROUTING: REGRESSION ANALYSIS FOR STAGE STORAGE RELATIONSHIP
DESI
1FL0?. ROGRAPHS
1. PRE-DEVELOPEHEHT
' OFF-SITE AREA 0.00 ACRES
((1/4 AC LOTS) C. 0.35
ON-SITE AREA 13.00 ACRES
(UNIMPROVED) C. 0.35
13.0 ACRES C. 0.35
TIME OF CONCENTRATION
HYDRAULIC PATH VELOCITY LENGTH TIME
SHEEP FLOW S fps 300 ft 600 sec
CHANNEL FLOW 8.0 fps ft sec
600 sec
Tc - 10.0 win
e PEAK FLOW 0 - CIA
I(2) - 4.3 in/hr
I(10) - 5.8 in/hr
I(100) - 9.0 in/hr
Q(2) - 19.6 CPS
Q(10) - 26.4 CFS
Q(100) - 36.4 CFS
t 2. POST-DEVELOPEHEifT
OFF-SITE AREA
((1/4 AC LOTS) 0 ACRES C. 0.35
ON-SITE AREA 38.15: IMPERVIOUS
IMPERVIOUS 4.96 ACRES C. 0.95
LAWN 8.04 ACRES 0.35
SITE DRAINAGE AREA AVERAGE 0.58
' COMPOSITE 13.0 ACRES C. 0.58
TIME OF CONCENTRATION
HYDRAULIC PATH VELOCITY LENGTH TIME
SHEET FLOW S fps 250 ft 500 sec
CHANNEL FLOW 8.0 fps 800 ft 100 sec
' 600 sec
Tc - 10.0 win
' PEAK FLOW I(2) 0 - CIA
- 4.3 in/hr
100) - 5.3 in/hr
I(100)- 8 0 in/hr
Q(2) = 32.4 CFS
0(10) 43.6 CFS
0(100) - 60.2 CPS
' DEPTH OF RUNOFF
2-YEAR 6-HOUR PRECIPATION (P) - 2.52 in
10-YEAR 6-11OUR PRECIPATION (P) - 3.71 in
100-YEAR 6-HOUR PRECIPATION (P) - 4.93 in
CH 83
S - (1000/CN)-30 - 2.05 in
RUNOFF DEPTH(Q¦) - (P-0.2 x S)"2/(P+0.8 x S) - 1.07 in 2-YEAR 6-HOUR RUNOFF DEPTH
RUNOFF DEPTH(Q-) - (P-0.2 x S)"2/(P+0.8 x S) - 2.04 in 10-YEAR 6-110UR RUNOFF DEPTH
RUNOFF DEPTH(Q-) - (P-0.2 x S)"2/(P+0.8 x S) - 3.11 in 100-YEAR 6-HOUR RUNOFF DEPTH
TIME OT PEAK - RUNOFF VOLUME/(I.39 x Op;2-YEAR 18.73 ¦in
TIME OT PEAK - RUNOFF VOLUHE/(1.39 x OP; 10-YEAR 26.40 ¦in
TIME OT PEAK - RUNOFF VOLUME/(l. 39 x Op. 100-YEAR 29.24 win

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D. ESTIMATE STORAGE
1. S - (Q(Post)-Q(Pr )) - Tp
S - 7678 CF
2. POND ELEVATIONS/AREA/VOLUME
CUMULATIVE
TEMP\PERM SED STORAGE REQ'D 27679 CF 27679 CF
PERMAHENT STORAGE REQ'D 5899 CF 33578 CF
ESTIMATED STAGE STORAGE 7678 CF 412SS CF
ASSUME POND INVERT (DOTTOH OF POND) 871.0
SEDIMENT STORAGE REQUIRED 5899 CF
WATER QUALITY SURFACE AREA REQUIRED 9057 SF
ACCUMALATED Z
ELEV AREA VOLUME VOLUME STAGE In S In Z
871.00 3629 0 0 0.0
872.00 4480 4047 4047 1.0 8.306 0.000
873.00 5398 4932 8979 2.0 9.103 0.693
874.00 6383 5884 14863 3.0 9.607 1.099
875.00 7434 6902 21764 4.0 9.988 1.386
876.00 8552 7986 29751 5.0 10.301 1.609
877.00 9736 9138 38888 6.0 10.568 1.792
878.00 15143 12340 51229 7.0 10.844 1.946
879.00 16662 15896 67125 8.0 11.114 2.079
800.00 18247 17448 84574 9.0 11.345 2.197
881.00 19899 19067 103641 10.0 11.549 2.303
882.00 21618 20753 124393 11.0 11.731 2.398
883.00 23403 22505 146898 12.0 11.897 2.485
884.00 25000 24197 171095 13.0 12.050 2.565
885.00 28000 26486 197581 14.0 12.194 2.639
886.00 31500 56375 227470 15.0 12.335 2.708
AVERAGE - 10.930 1.964
ASSURE SEDIMENT STORAGE ELEVATION - 874.0
SEDIMENT STORAGE VOLUME PERMANENT - 13911 CF
ASSUME ORIFICE ELEVATION - 877.20
SURFACE AREA PROVIDED - 10817 SF
PERMANENT WATER QUALITY VOLUME 29903 CF
ASSUME RISOR ELEVATION = 878.80
TEMPORARY WATER QUALITY VOLUME - 22033 CF
ASSUME EMERGENCY SPILLWAY ELEVATION - 880.10
ASSUME BARREL INVERT ELEVATION 874.0
3. REGRESSION ANALYSIS SUMMARY OUTPUT PERFORMED ON LAST 8 ENTRIES
vher
b-(sua(ln(Z)-ln(Z))-1/n-sua(ln(Z))-sua(ln(S)))/(su a(ln(Z)"2)-1/n-(sua(ln(S )))"2)
b- 1.77
a-1/n-sua(ln(S))-b/n-sua(ln(Z))
a- 7.45
R"2-(sum(In(Z)-ln(S))-n- In(Z)_ln(S)_)"2/((sun (ln(z )"2)-n-In(Z)_"2)-(sua(In (S)"2)-n- ln(S)_"2)
R"2- 1.00
Ks-3"a
Ks- 1720
SEDIMENT
Z STORAGE
est ELEV
0.00
1.62 874.00
2.54
3.37
4.18
4.98
5.80
6.77
7.88
8.98
10.07
11.16
12.26
13.36
14.49
15.69
874.00
5899 CF REQUIRED
9057 SF REQUIRED
18563 CF REQUIRED
I C. OUTLET STRUCTURES
1. PRINCIPLE SPILLWAY
INVERT ELEVATION z 874.0
' ASSUME RISOR ELEVATION 878.8
SOLVE FOR ROUGH RISOR SIZE @ 26.4 CFS
DIAMETER(in)-Q-12/(Cv-(H"312) •3.14159)
'.... ROUGH DIAMETER -
SOLVE FOR ROUGH BARREL SIZE 31 in
DIAMETER(in)- (Q-4/(3.14159-Cd-(2-g-h)". S)".S
ROUGH DIAMETER - 21 in
ASSUME RISOR DIA - 36 in 36
ASSUME BARREL DIA 24 in 24
ASSUME ORIFICE PLATE DIA 21 in 24
2. EMERGENCY SPILLWAY
SOLVE FOR WEIR LENGTH USE h- 1.0 ft
ASSUME SPILLWAY ELEV - 880.1
L-Q/(Cv-h"3/2)
vhere Q(100) - 60.2 cfs
RISOR Q Q ELEV 878.80 22.6 cfs
' EMERGENCY SPILLWAY Q 37.6 cfs
WEIR LGTR (ft) 13 ft
100-YEAR H.W.L. 880.76
TOP OF DAM
WEIR ORIFICE
ORIFICE -
PRINCIPAL 882.1
EMERGENCY
TOTAL
ELEV RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
678.0 0.0 22.6 0.0 0.0 0.0 0.0
879.0 2.8 23.2 15.2 2.8 0.0 2.8
879.2 7.9 23.7 21.5 7.9 0.0 7.9
879.4 14.5 24.3 26.4 14.5 0.0 14.5
879.6 22.3 24.8 30.4 22
3 0
0 22
3
' 879.8 31.1 25.4 34.0 .
25.4 .
0.0 .
25.4
880.0 40.9 25.9 37.3 25.9 0.0 25.9
880.2 51.5 26.4 40.3 26.4 0.9 27.4
880.4 62.9 26.9 43.1 26.9 4.9 31.8
880.6 75.1 27.4 45.7 27.4 10.6 38.0
' 880.8 08.0 27.9 48.1 27.9 17.6 45.5
881.0 101.5 28.4 50.5 20.4 25.6 54.0
881.2 115.6 28.8 52.7 28.8 34.6 63.4
881.4 130.4 29.3
ALLOWABLE OUTFLOW 54.9 29.3 • 44.5
26.4 73.8
CFS
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D. ROUTING 2, 10 6 111 YEAR POST-DEVELOPEMENT STORM TDRU POND
' 1. INPUT DATA FOR 2-YEAR STORM
Q(2) 32.4
Tp 18.73
TIME INCREMENT 2.00 min
' Ks 1720
b 1.77
INVERT ELEVATION 871.00
ORIFICE ELEVATION 877.20
RISOR ELEVATION 878.80
PERMANENT STORAGE 65847
EM SPILLWAY ELEV 880.10
TIME INFLOW STORAGE STAGE
' 0.00 0.0 43814 877.20
2.00 0.9 43868 877.20
4.00 3.5 44133 877.23
6.00 7.S 44795 877.28
8.00 12.5 45997 077.37
10.00 17.9 47823 877.51
12.00 23.1 50283 877.70
14.00 27.5 53322 877.93
16.00 30.7 56816 870.18
' 18.00 32.2 60593 878.44
20.00 32.0 64447 878.71
22.00 30.0 68060 878.95
24.00 26.5 70981 879.14
26.00 23.1 72999 879.27
28.00 20.1 74244 879.35
30.00 17.5 74907 879.39
32.00 15.2 75155 879.40
34.00 13.3 75120 879.40
1 36.00 11.5 74898 879.39
38.00 10.0 74559 879.37
40.00 8.7 74151 879.34
42.00 7.6 73708 879.31
44.00 6.6 73252 879.28
' 46.00 S.8 72799 879.25
48.00 5.0 72357 879.23
50.00 4.4 71932 879.20
52.00 3.8 71529 879.17
1 54.00 3.3 71140 879.15
56.00 2.9 70791 879.12
58.00 2.5 70457 879.10
60.00 2.2 70145 879.08
62.00 1.9 69856 879.06
' 64.00 1.7 69587 879.05
66.00 1.4 69337 879.03
68.00 1.3 69106 879.02
70.00 1.1 68891 879.00
' 72.00 0.9 68693 878.99
74.00 0.8 68509 878.98
76.00 0.7 68330 878.96
78.00 0.6 68180 878.95
80.00 0.5 68034 878.94
82.00 0.5 67833 878.94
84.00 0.4 67773 878.93
PEAK INFLOW 32.4 CFS
PEAK OUTFLOW n 14.6 CFS
PEAK ALLOWABLE OUTFLOW 19.6 CFS
PEAK ELEV - 879.40
PEAK STORAGE - 75155 CF

11

WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR DARREL RISOR SPILLWAY SPILLWAY OUTFLOW
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
1.7 23.0 13.0 1.7 0.0 1.7
6.1 23.6 19.8 6.1 0.0 6.1
9.9 23.9 23.3 9.9 0.0 9.9
12.5 24.1 25.1 12.5 0.0 12.5
14.0 24.3 26.1 14.0 0.0 14.0
14.6 24.3 26.4 14.6 0.0 14.6
14.5 24.3 26.4 14.5 0.0 14.5
14.0 24.3 26.1 14.0 0.0 14.0
13.2 24.2 25.6 13.2 0.0 13.2
12.3 24.1 25.0 12.3 0.0 12.3
11.4 24.0 24.3 11.4 0.0 11.4
10.4 24.0 23.6 10.4 0.0 10.4
9.5 23.9 22.9 9.5 0.0 9.5
8.6 23.8 22.2 8.6 0.0 8.6
7.8 23.7 21.5 7.8 0.0 7.8
7.1 23.7 20.8 7.1 0.0 7.1
6.4 23.6 20.1 6.4 0.0 6.4
5.8 23.5 19.4 5.8 0.0 5.8
5.2 23.5 18.7 5.2 0.0 S.2
4.7 23.4 18.1 4.7 0.0 4.7
4.2 23.3 17.5 4.2 0.0 4.2
3.8 23.3 16.9 3.8 0.0 3.8
3.4 23.3 16.3 3.4 0.0 3.4
3.1 23.2 15.8 3.1 0.0 3.1
2.8 23.2 15.3 2.8 0.0 2.8
2.5 23.1 14.8 2.5 0.0 2.5
2.3 23.1 14.3 2.3 0.0 2.3
2.1 23.1 13.8 2.1 0.0 2.1
1.9 23.0 13.4 1.9 0.0 1.9
1.7 23.0 13.0 1.7 0.0 1.7
1.6 23.0 12.6 1.6 0.0 1.6
1.4 23.0 12.2 1.4 0.0 1.4

,l
I -,")

1
2. INPUT DATA FOR 10-YEAR STORM
0(10) 44
Tp 26.40 min
TIME INCREMENT 2 00 min
Ks 1720
b 1.77
INVERT ELEVATION B71.00
ORIFICE ELEVATION 877.20
RIGOR ELEVATION 878.60
PERMANENT STORAGE 43814
EM SPILLWAY ELEV 880.10
TIME INFLOW STORAGE STAGE
0.00 0.0 43814 877.20
2.00 0.6 438S1 077.20
4.00 2.4 44033 877.22
6.00 S.3 44499 877.25
8.00 9.2 45368 877.32
10.00 13.7 46741 877.43
12.00 18.7 48687 877.58
14.00 23.9 51245 877.77
16.00 29.0 S4416 878.01
10.00 33.6 58172 878.27
20.00 37.6 62447 878.S7
22.00 40.7 67103 878.88
24.00 42.8 71632 879.18
26.00 43.6 75463 879.42
28.00 43.3 78407 879.61
30.00 41.7 80638 879.74
32.00 39.0 82433 879.85
34.00 35.5 83828 879.94
36.00 32.2 64792 879.99
38.00 29.2 85361 880.03
40.00 26.4 SS578 880.04
42.00 23.9 85480 880.04
44.00 21.7 85104 880.01
46.00 19.7 84480 879.98
48.00 17.8 83637 879.93
50.00 16.1 82601 879.86
52.00 14.6 81395 879.79
54.00 13.3 80040 879.71
56.00 12.0 78659 879.62
58.00 10.9 77439 879.55
60.00 9.9 76428 879.48
62.00 8.9 7SS70 879.43
64.00 8.1 74831 879.38
66.00 7.3 74183 879.34
68.00 6.7 73608 879.31
70.00 6.0 73092 879.27
72.00 5.5 72626 879.24
74.00 S.0 72201 879.22
76.00 4.5 71812 879.19
78.00 4.1 71454 879.17
80.00 3.7 71123 879.15
82.00 3.3 70816 879.13
84.00 3.0 70531 879.11
86.00 2.7 70266 879.09
88.00 2.S 70018 679.07
PEAK INFLOW - 43.65 CFS
PEAK OUTFLOW - 26.00 CFS
PEAK ALLOWABLE OUTFLOW, 26.39 CFS
PEAK ELEV 880.04
PEAK STORAGE 85S78 CF
WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RIGOR BARREL RIGOR SPILLWAY SPILLWAY OUTFLOW
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.8 22.8 9.0 0.8 0.0 0.8
7.3 23.7 21.0 7.3 0.0 7.3
1S.3 24.4 26.9 15.3 0.0 1S.3
22.S 24.9 30.6 22.S 0.0 22.S
28.5 2S.2 33.1 2S.2 0.0 2S.2
33.6 2S.S 34.9 25.5 0.0 25.S
37.7 25.7 36.3 25.7 0.0 25.7
40.6 25.9 37.2 2S.9 0.0 2S.9
42.4 26.0 37.7 26.0 0.0 26.0
43.0 26.0 37.9 26.0 0.0 26.0
42.7 26.0 37.8 26.0 0.0 26.0
41.6 25.9 37.S 25.9 0.0 25.9
39.7 2S.8 36.9 2S.8 0.0 2S.8
37.1 2S.7 36.1 2S.7 0.0 25.7
34.1 2S.S 35.1 2S.5 0.0 25.5
30.6 25.3 33.9 25.3 0.0 2S.3
26.9 2S.1 32.4 25.1 0.0 25.1
23.2 24.9 30.9 23.2 0.0 23.2
20.1 24.7 29.4 20.1 0.0 20.1
17.6 24.5 28.1 17.6 0.0 17.6
15.5 24.4 27.0 15.5 0.0 15.5
13.8 24.2 26.0 13.8 0.0 13.8
12.4 24.1 25.1 12.4 0.0 12.4
11.2 24.0 24.2 11.2 0.0 11.2
10.1 23.9 23.4 10.1 0.0 10.1
9.2 23.9 22.6 9.2 0.0 9.2
8.3 23.8 21.9 8.3 0.0 0.3
7.6 23.7 21.3 7.6 0.0 7.6
6.9 23.6 20.6 6.9 0.0 6.9
6.3 23.6 20.0 6.3 0.0 6.3
5.8 23.5 19.4 5.8 0.0 S.8
S.3 23.5 18.9 5.3 0.0 5.3
4.9 23.4 18.4 4.9 0.0 4.9
4.S 23.4 17.8 4.5 0.0 4.5

3. INPUT DATA FOR 100-YEAR STORM
O(100)
Tp
TIME INCREMENT
Ks
b
INVERT ELEVATION
ORIFICE ELEVATION
RISOR ELEVATION
PERMANENT STORAGE
EM SPILLWAY ELEV
TIRE INFLOW STORA
0.00 0.0 4381
' 2.00 0.7 4385
4.00 2.7 4406
6.00 6.0 44S8
' 8.00
10.00 10.5
15.8 1557
1715
12.00 21.7 4940
14.00 28.1 5239
16.00 34.6 5615
18.00 40.8 6067
20.00 46.6 6591
22.00 S1.6 7139
24.00 5S.6 7636
26.00
28.00 58.4
59.9 8061
8160
30.00 60.1 8866
32.00 S8.9 9218
34.00 S6.3 9489
36.00 S2.6 9671
' 38.00 48.2 9770
40.00 44.1 9802
42.00 40.4 9784
41.00
46.00 36.9
33.8 9733
9658
48.00 30.9 9567
50.00 28.3 9466
S2.00 2S.9 9359
54.00 23.7 9247
} 56.00 21.7 9133
58.00 19.8 9016
60.00 18.1 8898
' 62.00
64.00 16.6
15.2 8776
8648
66.00 13.9 8510
68.00 12.7 8360
70.00 11.6 8199
72.00 10.6 8029
1 74.00 9.7 7862
76.00 8.9 7718
78.00 8.1 7604
80.00
82.00 7.5
6.8 7511
7433
84.00 6.2 7367
86.00 5.7 7310
88.00 5.2 7260
90.00 4.8 7216
' 92.00 4.4 7176
94.00 4.0 7140
96.00 3.7 7107
98.00
PEAK INFLOW 3.3 7076
PEAK OUTFLOW
PEAK ELEV -
' PEAK STORAGE

60
29.24 min
2 00 min
1720
1.77
871.00
877.20
878.80
43814
880.10
GE STAGE
4 877.20
S 877.20
1 877.22
8 877.26
8 877.34
1 877.46
2 877.63
4 877.86
3 878.13
5 878.45
6 878.80
3 079.16
6 079.48
6 879.74
1 879.99
5 880.22
1 880.43
1 880.58
4 880.69
5 880.74
1 880.76
6 880.75
0 880.72
0 000.68
4 000.63
6 080.57
2 880.51
7 880.45
3 680.38
8 880.31
1 880.24
2 880.17
6 880.10
S 880.01
3 079.92
4 879.03
3 879.72
0 879.62
8 079.53
6 079.46
3 879.40
6 879.3S
6 879.31
5 879.27
5 879.24
2 079.21
5 879.19
6 079.16
9 879.14
0 879.12
60.21 CFS
43.89 CFS
WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 22.6 2.3 0.0 0.0 0.0
6.8 23.6 20.5 6.8 0.0 6.8
17.4 24.5 28.1 17.4 0.0 17.4
20.S 25.2 33.1 25.2 0.0 25.2
40.3 2S.9 37.1 25.9 0.0 25.9
52.8 26.S 40.6 26.5 1.3 27.8
64.6 27.0 43.4 27.0 5.6 32.6
74.1 27.4 45.5 27.4 10.1 37.4
80.6 27.6 46.8 27.6 13.5 41.1
84.2 27.8 47.4 27.8 15.5 43.2
BS.4 27.8 47.7 27.8 16.1 43.9
84.7 27.8 47.5 27.8 15.7 43.S
82.8 27.7 47.2 27.7 14.7 42.4
80.1 27.6 46.7 27.6 13.2 40.8
76.9 27.S 46.0 27.S 11.5 39.0
73.3 27.3 45.3 27.3 9.7 37.0
69.5 27.2 44.5 27.2 7.9 35.0
65.6 27.0 43.7 27.0 6.1 33.1
61.7 26.9 42.8 26.9 4.4 31.3
57.8 26.7 41.8 26.7 2.9 29.6
53.9 26.5 40.9 26.5 1.6 28.1
49.9 26.3 39.8 26.3 0.6 26.9
4S.9 26.1 38.7 26.1 0.0 26.1
41.6 2S.9 37.5 25.9 0.0 25.9
37.0 2S.7 36.1 25.7 0.0 25.7
32.3 2S.4 34.5 25.4 0.0 25.4
27.6 25.2 32.7 2S.2 0.0 2S.2
23.1 24.9 30.8 23.1 0.0 23.1
19.4 24.7 29.1 19.4 0.0 19.4
16.7 24.5 27.6 16.7 0.0 16.7
14.S 24.3 26.4 14.5 0.0 14.5
12.7 24.2 25.3 12.7 0.0 12.7
11.3 24.0 24.3 11.3 0.0 11.3
10.1 23.9 23.4 10.1 0.0 10.1
9.1 23.9 22.6 9.1 0.0 9.1
8.3 23.8 21.9 8.3 0.0 8.3
7.5 23.7 21.2 7.S 0.0 7.5
6.8 23.6 20.5 6.8 0.0 6.8
6.3 23.6 19.9 6.3 0.0 6.3
5.7 23.S 19.4 S.7 0.0 5.7
880.76 EMERGENCY SPILLWAY ACTIVATED
98021 CF

t
t
t
E. ORIFICE BOLE
4 -DAY RELEASE
NUMBER OF BOLES 2
AVERAGE SURFACE AREA 13771 SF
DETENTION DEPTH 1.60 FT
a - 0.415/t-A-(h)".S
a - 3.01 SO IN
d - 1.38 IN 1 6/16 in
0 -DAY RELEASE
NUMBER OF HOLES 2
AVERAGE SURFACE AREA 13771 SF
DETENTION DEPTH 1.60 FT
a - 0.41S/t-A-(h)".S
a - 1.51 SO IN
d - 0.98 IN 0 16/16 in
AVE d - 1.18 IN 1 3/16 in
F. FLOTATION OF RIGOR
VOLUME OF RIGOR
ASSUME INVERT ELEV 874.0
ASSUME RIGOR ELEV 878.8
RIGOR DIAMETER - 36 in
V - 3.14159-r'2-h
V 33.9 CF
VOLUME OF BARREL
ASSUME LENGTH - 15.00 ft
BARREL DIAMETER - 24 in
V - 3.14159-r"2-L
V - 47.1 CF
TOTAL VOLUME - 81.1 CF
CONCRETE REQ'D
DISPLACED WATER - 5058 LB
WEIGHT OF CONCRETE (DOUYAHT) - 87.60 LB/CF
CONCRETE REQ'D - 57.7 CF
RIGOR AREA • 7.1 SF
CONCRETE REQ'D - 8.2 LF
ADD IS% SAFETY FACTOR - 9.4 LF
66.4 CF
'
SUMMARY
TOP OF DAM
100-YEAR HIGH WATER
10-YEAR HIGH WATER
EMERGENCY SPILLWAY ELEV
RISOR ELEV
ORIFICE ELEV
INVERT ELEV
SEDIMENT STORAGE REQUIRED
SEDIMENT STORAGE PROVIDED
TEMPORARY WATER QUALITY VOLUME REQUIRED
' TEMPORARY WATER QUALITY VOLUME PROVIDED
SURFACE AREA REQUIRED
SURFACE AREA PROVIDED
RISOR DIAMETER
BARREL DIAMETER
ORIFICE PLATE DIAMETER
ORIFICE HOLE t/DIAMETER
WEIR LENGTH

t

[I
1
1
2 @
882.1
880.8
880.0
880.1
878.80
877.20
874.0
5899 CF
13911 CF
18563 CF
22033 CF
9057 SF
10817 SF
36 in
24 in
21 in
1.38 in
13 ft

EROSION CONTROL AND STORM WATER
HYDRAULIC CALCULATIONS
FOR
LILLIEFIELD SUBDIVISION
DEVELOPED BY.•
FAITH PROPERTIES OF THE CAROLINAS, LLC
APRIL, 2005
O`??N,ESS ROB -
io -
C1tJ?; • .2. ,
JAMESTOWN ENGINEERING CROUP, INC.
117 EAST MAIN STREET P. 0. BOX 365
J"ESTOWN, NC 27282
[phone]
P@113ZINWE" D
OCT 1 0 Zoos
DENR - WMER QUALITY
, ETL`? DS A.ND STG Z'.",',,kTER E,j;;; Cfi

EROSION CONTROL AND STORM WATER
HYDRAULIC CALCULATIONS
FOR
LILLIEFIELD SUBDIVISION
DEVELOPED BY.-
FAITH PROPERTIES OF THE CAROLINAS, LLC
APRIL, 2005
I _)
I`,1 I1,,,,''

N CAR
- L =
6
JAMESTOWN ENGINEERING CROUP, INC.
117 EAST HAIN STREET P. 0. BOX 365
JAMESTOWN, NC 27282
[phone]
' JAHESTOUN ENGINEERING GROUP. INC.
117 E. HAIN STREET
JAHESTOWN, NC 27262
DESIGN OF VATER QUALITY POND NO. 1
' GENERAL
t. DESIGN CRITERIA
DESIGN IS BASED UPON CITY OF HIGH POINT STORMYATER GUIDELINES
' FOR WATER QUALITY AND FLOOD CONTROL. IN CONJUNCTION WITH ENVIRONMENTAL
REGULATIONS. ARTICLE A. SECTION 9-7-S FOR WATERSHED CRITICAL AREAS.
B. SITE INFORMATION
THE PROPOSED SITE IS LOCATED WITHIN THE OAK HOLLOW GENERAL WATERSHED
' GENERAL SITE DATA IS LISTED BELOW:
POND $1
' SITE AREA 12.7
OFF-SITE AREA 6.60
TOTAL SITE AREA 19.30
OFF-SITE DRAINAGE AREA 6.60
SITE DRAINAGE AREA 12.7
DISTURBED AREA 12.7
S UNITS PROPOSED 52
IMPERVIOUS AREA SF/UNIT 3000
UNITS 3.S8
STREETS, SIDEWALKS, POOL 1.90
0% ADJACENT LOT @ 6.60 AC 0.00
TOTAL 5.48
% BUILT UPON (FOR SITE DRAINAGE AREA) 28.40%
% BUILT UPON (FOR TOTAL SITE AREA) 43.16%
' DU/ACRE (SITE) 4.1
IN ACCORDANCE WITH TABLE 7-5-1 A WET DETENTION POND IS REQUIRED
' C. WET POND INFORMATION/REQUIREMENTS
VOLUME REQUIREMENTS OF POND 1
28.4% IMPERVIOUS @ 3.9 ft 1.06% OF DRAINAGE AREA
POOL SURFACE AREA REQUIRED .011 x 19.30 x 43560
1/8 PERM SID STORAGE .125 x 19.30 x 3630
+ lit TEMP SED STORAGE .500 x 12.70 x 3630
TOTALSEDIMENT STORAGE VOLUME REQUIRED
RUNOFF VOLUME - 1.Oin x Rv x DA vhere Rv - 0.05 + 0.009 (I)
it
TEMPORARY VOLUME - 1.0 in x 0.31 x 19.30
li
D. METHOD OF ANALYSIS
INFLOW HYDROGRAPHS:
PEAK INFLOWS:
POND ROUTING:

III

SMALL WATERSHED METHOD
RATIONAL METHOD
REGRESSION ANALYSIS FOR STAGE STORAGE RELATIONSHIP
8897 SF
8757 CF
23051 CF
31808 CF
21410 CF
POND 91 DESIGN
HYDRDGRAPHS
A. INFLOV
1.

PRE-DEVELOPEMENT
OFF-SITE AREA 6 60 ACRES
(<1/4 AC LOTS) C• 0.3S
ON-SITE AREA 12.70 ACRES
(UNIMPROVED) C. 0.35
19.3 ACRES C. 0.3S
/
TIME OF CONCENTRATION
HYDRAULIC PATH VELOCITY LENGTH TIME
SHEET FLOV 15 fps 300 it 600 sec
CHANNEL FLOV 8.0 fps it sec
600 sec
Tc 10.0 min
PEAK FLOW Q CIA
I( in/hr
' 1(10) 5 5 6 8 in/hr
I(100) - 8.0 in/hr
Q(2) - 29.0 CFS
0(10) - 39.2 CPS
Q(100) - S4.0 CPS
2. POST-DEVELOPEMENT
OFF-SITE AREA
((1/4 AC LOTS) 6.6 ACRES C. 0.65
ON-SITE AREA 28.40: IMPERVIOUS
IMPERVIOUS 5.48 ACRES C. 0.95
LAVN 7.22 ACRES 0.35
SITE DRAINAGE AREA AVERAGE 0.61
COMPOSITE 19.3 ACRES C. 0.62
TIME OF CONCENTRATION
HYDRAULIC PATH VELOCITY LENGTH TIME
SHEET FLOW 5 fps 250 it S00 sec
CHANNEL FLOW 8 0 fps 800 it 100 sec
600 sec
Tc 10.0 min
PEAK FLOW Q - CIA
I(2) 4.3 in/hr
I(10) 5.0 in/hr
' I(100)• 8 0 in/hr
Q(2) 51.7 CFS
0(10) = 69.7 CFS
1 Q(100) - 96.2 CFS
DEPTH OF RUNOFF
2-YEAR 6-HOUR PRECIPATION (P) • 2.S2 in
10-YEAR 6-HOUR PRECIPATION (P) 3.71 in
100-YEAR 6-HOUR PRECIPATION (P) = 4.93 in
CH • 83
S = (1000/CN)-10 • 2.05 in
RUNOFF DEPTH(Q•) _ (P-0.2 x S)"2/(P+0.8 x S) • 1.07 in 2-YEAR 6-HOUR RUNOFF DEPTH
RUNOFF DEPTH(Q•) • (P-0.2 x S)"2/(P+0.8 x S) • 2.04 in 10-YEAR 6-HOUR RUNOFF DEPTH
RUNOFF DEPTII(Q•) _ (P-0.2 x S)'2/(P+0.8 K S) • 3.11 in 100-YEAR 6-HOUR RUNOFF DEPTH
TIME OT PEAK = RUNOFF VOLUHF/(1.39 x Qp,2-YEAR 17.40 min
TIME OT PEAK • RUNOFF VOLUMF/(1.39 x Qp.10-YEAR 24.53 min
TIME OT PEAK = RUNOFF VOLUME/(1.39 x Qp'100-YEAR 27.17 ¦in

ESTIMATE STORAGE
1. S - (Q(Post)-Q(Pre)) - Tp
S . 13593 CF
POND ELEVATIONS/AREA/VOLUME
2
. CUMULATIVE
TEHP\PERH SED STORAGE REQ'D 31808 CF 31008 CF
PERMANENT STORAGE REQ'D 8757 CF 40565 CF
ESTIMATED STAGE STORAGE 13593 CF 54159 CF
ASSUME POND INVERT (DOTTOH OF POND) . 834 0
SEDIMENT STORAGE REQUIRED 8757 CF
WATER QUALITY SURFACE AREA REQUIRED 8897 SF
ACCUHALATEC Z
ELEV AREA VOLUME VOLUME STAGE In S In Z
834.00 128 0 0 0.0
835.00 429 264 264 1.0 S.S75 0.000
836.00 905 652 916 2.0 6.820 0.693
837.00 1556 1216 2132 3.0 7.665 1.099
838.00 2372 1950 4082 4.0 8.314 1.386
839.00 3352 2848 6930 5.0 8.844 1.609
840.00 4469 3897 10827 6.0 9.290 1.792
841.00 5771 5106 15933 7.0 9.676 1.946
842.00 7258 6500 22433 8.0 10.018 2.079
843.00 8931 8080 30513 9.0 10.326 2.197
844.00 10789 9845 40359 10.0 10.606 2.303
845.00 12833 11796 S21SS 11.0 10.862 2.398
846.00 15049 13926 66081 12.0 11.099 2.485
847.00 17432 16226 82307 13.0 11.318 2.565
848.00 19982 18692 101000 14.0 11.523 2.639
849.00 22700 21327 122326 15.0 11.714 2.708
850.00 2SS49 64085 146392 16.0 11.894 2.773
AVERAGE - 11.040 1.964
ASSUME SEDIMENT STORAGE ELEVATION - 839.6
SEDIMENT STORAGE VOLUME PERMANENT - 9260 CF
ASSUME ORIFICE ELEVATION - 843.50
SURFACE AREA PROVIDED - 9860 SF
PERMANENT WATER QUALITY VOLUME - 26287 CF
ASSUME RISOR ELEVATION . 845.60
TEMPORARY WATER QUALITY VOLUME . 25276 CF
ASSUME EMERGENCY SPILLWAY ELEVATION . 848.30
ASSUME BARREL INVERT ELEVATION . 839.6
3. REGRESSION ANALYSIS SUMMARY OUTPUT PERFORMED ON LAST 8 ENTRIES
vhere
b-(sum(ln(Z)-ln(Z))-1/n-sum(ln(Z))-sum(ln(S)))/(sum(In(Z)^2)-1/n-(sum(ln(S)))^2)
b- 2.69
a-1/n¦sum(ln(S))-b/n-sum(ln(Z))
a. 4.43
R^2-(sum(In(Z)-ln(S))-n-ln(Z)_ln(S)_)^2/((sum(ln(z)^2)-n-ln(Z) _^2)-(sum( ln(S)^2)-n-ln(S)_^2)
R^2- 1.00
Ks-e^a
Ks. 84
SEDIMENT
Z STORAGE
est ELEV
0.00
1.53
2.44
3.34
4.25
5.17 839.60
6.10
7.OS
8.00
8.97
9.96
10.95
11.96
12.98
14.01
15.04
16.08
839.60
8757 CF REQUIRED
8897 SF REQUIRED
21410 CF REQUIRED
C. OUTLET STRUCTURES
1. PRINCIPLE SPILLWAY
INVERT ELEVATION = 839.6
' ASSUME RISOR ELEVATION 845.6
SOLVE FOR ROUGH RISOR SIZE 9 39.2 CFS
DIAMETER(in)-0•12/(Cv-(H'3/2)- 3.14159)
ROUGH DIAMETER - 22 in
SOLVE FOR ROUGH BARREL SIZE
DIAMETER(io)- (Q-4/(3.14159-Cd -(2-9-h)'. 5)'.S
ROUGH DIAMETER - 25 in
ASSUME RISOR DIA 36 in 48
ASSUME BARREL DIA 24 in 30
ASSUME ORIFICE PLATE DIA 21.0 in 30
2. EMERGENCY SPILLWAY
SOLVE FOR WEIR LENGTH USE h- 1.0 ft
ASSUME SPILLWAY ELEV - 848.3
L-Q/(Cv-h'3/2)
Q(
where 96.2 cfs
E
RISOR
RISOR Q 0 ELEV
865.60 =
25.9
cfs
' EMERGENCY SPILLWAY Q 70.3 cfs
WEIR LGTH (ft) 23 ft
100-YEAR H.W.L. 849.05
TOP OF DAM - 850.3
e WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
ELEV RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
845.6 0.0 25.9 0.0 0.0 0.0 0.0
' 845.8 2.8 26.4 15.2 2.8 0.0 2.8
846.0 7.9 26.9 21.5 7.9 0.0 7.9
846.2 14.5 27.4 26.4 14.5 0.0 14.5
846.4 22.3 27.9 30.4 22.3 0.0 22.3
' 846.6 31.1 28.4 34.0 28.4 0.0 28.4
846.8 40.9 28.8 37.3 28.8 0.0 28.8
847.0 51.5 29.3 40.3 29.3 0.0 29.3
847.2 62.9 29.8 43.1 29.8 0.0 29.8
847.4 75.1 30.2 45.7 30.2 0.0 30.2
' 847.6 88.0 30.6 48.1 30.6 0.0 30.6
847.8 101.5 31.1 50.5 31.1 0.0 31.1
848.0 115.6 31.5 52.7 31.5 0.0 31.5
848.2 130.4 31.9 54.9 31.9 0.0 31.9
' ALLOWABLE OUTFLOW 39.2 CFS
i
i
1
1
1
1
D. ROUTING 2. 10 S 100 YEAR POST-DEVELOPEHENT STORM THRU POND
' 1. INPUT DATA FOR 2-YEAR STORM
Q(2) 51.7
T 17 40
TIME INCREMENT 2 00 ¦in
' Ks 84
b 2.69
INVERT ELEVATION 834.00
ORIFICE ELEVATION 843.50
RIGOR ELEVATION 845.60
PERMANENT STORAGE 60831
EH SPILLWAY ELEV 848.30
WEIR ORIFICE ORIFICE PRINCIPAL EHERGENCY TOTAL
TIME
00
0 INFLOW STORAGE
0 35SS5
0 STAGE
843.50 RIGOR
0.0 BARREL
0.0 RIGOR
0.0 SPILLWAY
0.0 SPILLWAY
0.0 OUTFLOW
0.0
.
2.00 .
1.7 35655 843.51 0.0 0.0 0.0 0.0 0.0 0.0
4.00 6.5 36142 843.56 0.0 0.0 0.0 0.0 0.0 0.0
6.00 13.7 37354 843.68 0.0 0.0 0.0 0.0 0.0 0.0
8.00 22.6 39534 843.88 0.0 0.0 0.0 0.0 0.0 0.0
10.00 31.9 42801 844.18 0.0 0.0 0.0 0.0 0.0 0.0
12.00 40.4 47134 844.55 0.0 0.0 0.0 0.0 0.0 0.0
14.00 47.0 S2375 844.97 0.0 0.0 0.0 0.0 0.0 0.0
16.00
00
18 50.9
51
6 58246
64179 845.41
845.83 0.0
3.5 0.0
26.S 0.0
16.4 0.0
3.5 0.0
0.0 0.0
3.5
.
20.00 .
48.9 69177 846.17 13.3 27.3 25.7 13.3 0.0 13.3
22.00 43.4 72564 846.39 21.7 27.9 30.2 21.7 0.0 21.7
24.00 37.3 74425 846.50 26.7 28.1 32.4 26.7 0.0 26.7
26.00 32.2 75293 846.56 29.1 28.3 33.3 28.3 0.0 28.3
28.00 27.7 75488 846.57 29.7 28.3 33.5 28.3 0.0 28.3
30.00 23.9 75184 846.55 28.8 28.3 33.2 28.3 0.0 28.3
32.00 20.5 74458 846.51 26.8 28.1 32.4 26.8 0.0 26.8
34.00
36
00 17.7
2
15 73555
72618 846.45
846.39 24.3
21.8 28.0
27.9 31.4
30.2 24.3
21.8 0.0
0.0 24.3
21.8
.
38.00 .
13.1 71687 846.33 19.4 27.7 29.1 19.4 0.0 19.4
40.00 11.3 70789 846 27 17.2 27.6 27.9 17.2 0.0 17.2
42.00 9.7 69939 846.22 15.1 27.4 26.8 15.1 0.0 15.1
44.00 8.4 69143 846.17 13.2 27.3 25.6 13.2 0.0 13.2
46.00 7.2 68406 846.12 11.6 27.2 24.5 11.6 0.0 11.6
48.00 6.2 67727 846.07 10.1 27.1 23.4 10.1 0.0 10.1
50.00 5.4 67105 846.03 8.8 27.0 22.4 8.8 0.0 8.8
52.00
54
00 4.6
4
0 66536
66018 845.99
96
845 7.7
6.7 26.9
26.8 21.3
20.4 7.7
6.7 0.0
0.0 7.7
6.7
.
S6.00 .
3.4 65547 .
845.93 5.8 26.7 19.5 5.8 0.0 5.8
58.00 2.9 65119 845.90 5.0 26.7 18.6 5.0 0.0 5.0
60.00 2.5 64729 845.87 4.4 26.6 17.7 4.4 0.0 4.4
62.00 2.2 64376 845.85 3.0 26.5 16.9 3.8 0.0 3.8
64.00 1.9 64055 845.82 3.3 26.S 16.1 3.3 0.0 3.3
66.00 1.6 63764 845.80 2.9 26.4 15.4 2.9 0.0 2.9
68.00 1.4 63499 845.79 2.5 26.4 14.7 2.5 0.0 2.5
70.00 1.2 63258 845.77 2.2 26.3 14.0 2.2 0.0 2.2
72.00 1.0 63040 845.75 1.9 26.3 13.4 1.9 0.0 1.9
74.00 0.9 62840 845.74 1.6 26.3 12.8 1.6 0.0 1.6
76.00 0.8 62659 845.73 1.4 26.2 12.2 1.4 0.0 1.4
78.00 0.7 62494 845.72 1.2 26.2 11.6 1.2 0.0 1.2
' 80.00 0.6 62344 845.71 1.1 26.2 11.1 1.1 0.0 1.1
82.00 0.5 62207 845.70 0.9 26.1 10.6 0.9 0.0 0.9
84.00 0.4 62081 845.69 0.8 26.1 10.1 0.0 0.0 0.8
PEAK INFLO W i 51.7 CF S
PEAK OUTFLOW 28.3 CFS
PEAK ALLOWABLE OUTFLOW 29.0 CFS
PEAK ELEV - 846.57
PEAK STORAGE - 75488 CF
' 2. INPUT DATA FOR 10-YEAR STORM
Q(10) 70
Tp 24.53 in
TIME INCREMENT 2.00 Rxn
Ks 84
' y 2.69
INVERT ELEVATION 834.00
ORIFICE ELEVATION 843.50
RISOR ELEVATION 845.60
PERMANENT STORAGE 35555
EM SPILLVAY ELEV 848.30
TIME INFLOW STORAGE STAGE
' 0.00 0.0 35555 w 843.50
2.00 1.1 35623 843.51
4.00 4.5 35960 843.54
6.00 9.8 36817 843.62
8.00 16.8 38410 843.78
10.00 24.9 40909 844.01
12.00 33.7 44423 844.32
14.00 42.6 48997 844.70
16.00 50.9 54605 845.14
18.00 58.2 61148 y 845.62
20.00 64.0 67845 846.08
22.00 67.9 73632 846.45
24.00 69.7 78688 846.77
26.00 69.1 83523 847.05
28.00 66.4 88084 847.31
30.00 61.5 92126 847.54
32.00 55.5 95464 847.72
34.00 49.9 98065 847.85
' 36.00 44.9 99999 847.96
38.00 40.4 101338 848.02
40.00 36.3 102149 B48.07
42.00 32.7 102489 848.08
' 44.00 29.4 102411 848.08
46.00 26.4 101962 848.06
48.00 23.8 101184 848.02
50.00 21.4 100115 847.96
52.00 19.2 98789 847.89
'
J 54.00 17.3 97238 847.81
56.00 15.6 95488 847.72
58.00 14.0 93566 847.61
60.00 12.6 91494 847.50
' 62.00 11.3 89292 847.38
64.00 10.2 86979 847.25
66.00 9.2 84573 847.11
68.00 8.2 82088 846.97
70.00 7.4 79539 846.82
72.00 6.7 76939 846.66
74.00 6.0 74336 846.50
76.00 5.4 72121 846.36
78.00 4.9 70434 846.25
80.00 4.4 69114 846.16
82.00 3.9 68056 646.09
84.00 3.5 67192 846.04
86.00 3.2 66473 845.99
' 88.00 2.9 65866 845.95
PEAK INFLOW - 69. 74 CFS
PEAK OUTFLOW - 31. 68 CFS
PEAK ALLOVABLE OUTFLOJ- 39. 18 CFS
' PEAK ELEV 848 .08
PEAK STORAGE - 102489 CF

VEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RISOR SPILLVAY SPILLVAY OUTFLOW
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.1 26.0 S.1 0.1 0.0 0.1
10.4 27.1 23.6 10.4 0.0 10.4
24.5 28.0 31.4 24.5 0.0 24.5
39.1 28.8 36.7 28.8 0.0 28.8
54.4 29.4 41.0 29.4 0.0 29.4
69.7 30.0 44.5 30.0 0.0 30.0
83.8 30.5 47.4 30.5 0.0 30.5
95.8 30.9 49.5 30.9 0.0 30.9
105.3 31.2 51.1 31.2 0.0 31.2
112.4 31.4 52.2 31.4 0.0 31.4
117.4 31.6 53.0 31.6 0.0 31.6
120.4 31.6 53.4 31.6 0.0 31.6
121.7 31.7 53.6 31.7 0.0 31.7
121.4 31.7 53.6 31.7 0.0 31.7
119.7 31.6 53.3 31.6 0.0 31.6
116.8 31.5 52.9 31.5 0.0 31.5
112.9 31.4 52.3 31.4 0.0 31.4
107.9 31.3 51.5 31.3 0.0 31.3
102.2 31.1 50.6 31.1 0.0 31.1
95.9 30.9 49.5 30.9 0.0 30.9
88.9 30.7 48.3 30.7 0.0 30.7
81.5 30.4 46.9 30.4 0.0 30.4
73.8 30.2 45.4 30.2 0.0 30.2
65.9 29.9 43.7 29.9 0.0 29.9
57.8 29.6 41.9 29.6 0.0 29.6
49.7 29.2 39.8 29.2 0.0 29.2
41.7 28.9 37.5 28.9 0.0 28.9
33.9 28.5 35.0 28.5 0.0 28.5
26.5 28.1 32.3 26.5 0.0 26.5
20.5 27.8 29.6 20.5 0.0 20.5
16.3 27.5 27.4 16.3 0.0 16.3
13.2 27.3 25.6 13.2 0.0 13.2
10.8 27.1 23.9 10.8 0.0 10.8
9.0 27.0 22.5 9.0 0.0 9.0
7.5 26.9 21.2 7.5 0.0 7.5
6.4 26.8 20.1 6.4 0.0 6.4

3. INPUT DATA FOR 100-YEAR STORM
1 0(100) 96
Tp 27.17 t in
TIME INCREMENT 2 00 ¦in
Ks 84
b 2.69
INVERT ELEVATION 834.00
ORIFICE ELEVATION 843.50
j RIGOR ELEVATION 845.60
PERMANENT STORAGE 35555
EM SPILLWAY ELEV 848.30
TIME INFLOW STORAGE STAGE WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RIGOR SPILLWAY SPILLWAY OUTFLOW
0.00 0.0 35555
35632 843.50
51
843 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0 0.0
0.0
2.00
00
4 1.3
5.1 36012 .
843.55 0.0 0.0 0.0 0.0 0.0 0.0
.
00
6 11.1 36982 843.64 0.0 0.0 0.0 0.0 0.0 0.0
.
8
00 19.2 38799 843.81 0.0 0.0 0.0 0.0 0.0 0.0
' .
00
10 28.7 41672 844.08 0.0 0.0 0.0 0.0 0.0 0.0
.
12
00 39.3 45756 844.43 0.0 0.0 0.0 0.0 0.0 0.0
.
14
00 50.4 51141 844.88 0.0 0.0 0.0 0.0 0.0 0.0
.
16
00 61.4 57847 845.39 0.0 0.0 0.0 0.0 0.0 0.0
' .
18.00 71.6 65479
72892 845.92
41
846 5.7
22.6 26.7
27.9 19.3
30.6 5.7
22.6 0.0
0.0 5.7
22.6
20.00
00
22 80.6
87.9 79909 .
846.84 42.9 28.9 37.9 28.9 0.0 28.9
.
24.00 93.0 87230 847.26 66.8 29.9 43.9 29.9 0.0 29.9
00
26 95.8 94910 847.69 93.8 30.8 49.2 30.8 0.0 30.8
' .
00
28 96.0 102661 848.09 122.4 31.7 53.7 31.7 0.0 31.7
.
30
00 93.6 109935 848.46 150.1 32.5 57.5 32.5 3.7 36.1
.
32
00 86.9 115624 848.73 172.2 33.0 60.2 33.0 16.9 49.9
.
34
00 82.0 119061 848.89 185.7 33.3 61.7 33.3 27.2 60.6
.
36.00 74.6
8
67 120593
120830 848.96
97
848 191.7
192.6 33.5
33.5 62.4
62.5 33.5
33.5 32.3
33.1 65.8
66.6
38.00
40
00 .
61.6 120297 .
848.95 190.5 33.5 62.3 33.5 31.3 64.8
.
42
00 55.9 119334 848.90 186.7 33.4 61.9 33.4 28.1 61.5
.
44.00 50.8 118151 848.85 182.1 33.3 61.3 33.3 24.4 57.6
' 46.00 46.2 116867 848.79 177.0 33.1 60.8 33.1 20.5 53.6
00
48 42.0 115551 048.73 171.9 33.0 60.2 33.0 16.7 49.7
.
00
50 38.2 114237 848.66 166.8 32.9 59.6 32.9 13.1 46.0
.
00
52 34.7 112942 848.60 161.7 32.8 59.0 32.8 9.9 42.7
1 .
54.00
6
0 31.5
28
6 111669
110414 848.54
848.48 156.8
151.9 32.6
32.5 58.4
57.7 32.6
32.5 7.1
4.5 39.7
37.1
.0
5
58
00 .
26.0 109168 848.42 147.1 32.4 57.1 32.4 2.4 34.8
.
00
60 23.6 107914 848.36 142.3 32.3 56.5 32.3 0.8 33.1
.
62.00 21.5 106623 848.29 137.4 32.1 55.8 32.1 0.0 32.1
' 64.00 19.5 105227 848.22 132.1 32.0 55.1 32.0 0.0 32.0
00
66 17.7 103626 848.14 126.0 31.8 54.3 31.8 0.0 31.8
.
00
68 16.1 101842 848.05 119.3 31.6 53.3 31.6 0.0 31.6
.
70.00 14.7 99898 847.95 112.0 31.4 52.2 31.4 0.0 31.4
72.00
00 13.3
12
1 97811
95600 847.84
847.72 104.3
96.3 31.2
30.9 50.9
49.6 31.2
30.9 0.0
0.0 31.2
30.9
74.
00
76 .
11.0 93281 847.60 87.9 30.6 48.1 30.6 0.0 30.6
.
78.00 10.0 90870 847.47 79.4 30.3 46.5 30.3 0.0 30.3
80.00 9.1 88379 847.33 70.7 30.0 44.7 30.0 0.0 30.0
' 82.00 8.3 85821 847.18 62.0 29.7 42.8 29.7 0.0 29.7
84
00 7.5 83208 847.03 53.4 29.4 40.7 29.4 0.0 29.4
.
86.00 6.8 80550 846.88 44.9 29.0 38.5 29.0 0.0 29.0
88
00 6.2 77858 846.71 36.6 28.6 35.9 28.6 0.0 28.6
' .
90.00 5.6
5
1 75140
72527 046.55
38
846 2B.7
21.6 28.2
27.9 33.1
30.1 28.2
21.6 0.0
0.0 28.2
21.6
92.00
94.00 .
4.6 70595 .
846.26 16.7 27.6 27.7 16.7 0.0 16.7
96.00 4.2 69148 846.17 13.2 27.3 25.6 13.2 0.0 13.2
98.00 3.8 68037 846.09 10.8 27.1 23.9 10.8 0.0 10.8
' PEAK INFLOW • 96.19 CFS
PEAK OUTFLOW - 66.61 CFS
PEAK ELEV 848.97 EMERGENCY SPILLWAY ACTIVATED
' PEAK STORAGE - 120830 CF
1

I E. ORIFICE HOLE
4 -DAY RELEASE
NUMBER OF HOLES 2
AVERAGE SURFACE AREA 12036 SF
DETENTIOH DEPTH 2.10 FT
a - 0.415/t•A•(h)".5
a - 3.02 SQ IN
d - 1.39 IN 1 6/16 in
8 -DAY RELEASE
NUMBER OF HOLES 2
AVERAGE SURFACE AREA 12036 SF
DETENTION DEPTH 2.10 FT
a - 0.415/t-A-(h)".5
a - 1.51 SQ IN
d - 0.98 IN 0 16/16 in
AVE d - 1.18 IN 1 3/16 in
FLOTATION OF RISOR
VOLUME OF RISOR
ASSUME INVERT ELEV - 839.6
ASSUME RISOR ELEV • 845.6
RISOR DIAMETER 36 in
V - 3.14159-r'2•h
V 42.4 CF
VOLUME OF BARREL
ASSUME LFI;= - 1S.06 ft
BARREL DIAMETER - 24 in
V - 3.14159•r'2-L
V - 47.1 CF
TOTAL VOLUME - 89.5 CF
CONCRETE REQ'D
DISPLACED VATER SS87 LB
VEIGHT OF CONCRETE (DOUYANT) - 87.60 LB/CF
CONCRETE REQ'D - 63.8 CF
RISOR AREA • 7.1 SF
CONCRETE REQ'D = 9.0 LF
ADD 15% SAFETY FACTOR 10.4 LF
73.3 CF

SUMMARY
1 TOP OF DAM
100-YEAR HIGH VATER
j 10-YEAR HIGH VATER
EMERGENCY SPILLVAY ELEV
RISOR ELEV
' ORIFICE ELEV
INVERT ELEV
SEDIMENT STORAGE REQUIRED
SEDIMENT STORAGE PROVIDED
' SURFACE AREA REQUIRED
SURFACE AREA PROVIDED
RISOR DIAMETER
BARREL DIAMETER
ORIFICE PLATE DIAMETER
ORIFICE HOLE $/DIAMETER
VEIR LENGTH

2 2
850.3
849.0
848.1
848.3
845.60
843.50
839.6
8757 CF
9268 CF
8897 SF
9860 SF
36 in
24 in
21 in
1.39 in
23 It
' JAMESTOWN ENGINEERING GROUP, INC.
117 E. MAIN STREET
JAMESTOWN, NC 27282
DESIGN OF WATER QUALITY POND NO. 3

I•'. 1
/ORAL
._,
A. DESIGN CRITERIA
DESIGN IS BASED UPON CITY OF HIGH POINT STORMWATER GUIDELINES
FOR WATER QUALITY AND FLOOD CONTROL, IN CONJUNCTION WITH ENVIRONMENTAL
REGULATIONS, ARTICLE A, SECTION 9-7-5 FOR WATERSHED CRITICAL AREAS.
9. SITE INFORMATION
THE PROPOSED SITE IS LOCATED WITHIN THE OAK HOLLOW GENERAL WATERSHED
GENERAL SITE DATA IS LISTED BELOW:
'
POND •3
SITE AREA 13.3
OFF-SITE AREA 1.50
TOTAL SITE AREA 14.60
OFF-SITE DRAINAGE AREA 1.50
SITE DRAINAGE AREA 13.3
DISTURBED AREA 13.3
• UNITS PROPOSED 53
IMPERVIOUS AREA SF/UNIT 3000
UNITS 3.65
STREETS, SIDEWALKS, POOL 2.10
07. ADJACENT LOT a 1.50 AC 0.00
TOTAL 5.75
1 BUILT UPON (FOR SITE DRAINAGE AREAI 36.657.
' % BUILT UPON <FOR TOTAL SITE AREA) 43.23%
DU/ACRE (SITE) 4.0
' IN ACCORDANCE WITH TABLE 7-5-1 A WET DETENTION POND IS REQUIRED
7
C
WET POND INFORMATION/REQUIREMENTS
.
VOLUME REQUIREMENTS OF POND 1
' 36.9% IMPERVIOUS a 3.0 ft 1.691 OF DRAINAGE AREA
-
POOL SURFACE AREA REQUIRED •017 x 14.60 x 43560
10865 SF
1/6 PERM SED STORAGE .125 x 14.80 x 3630 6716 CF
112 TEMP SED STORAGE -500 x 13.30 x 3630 24140 CF
TOTALSEDIMENT STORAGE VOLUME REQUIRED 30855 CF
RUNOFF VOLUME = 1.0in x Rv x DA where Rv = 0.05 + 0.009 (I)
TEMPORARY VOLUME = 1.0 in x 0.40 x 14.80 = 21472 CF

' D. METHOD OF ANALYSIS
INFLOW HYDROGRAPHS: SMALL WATERSHED METHOD
PEAK INFLOWS:
POND ROUTING: RATIONAL METHOD
REGRESSION ANALYSIS FOR
STAGE STORAGE RELATI
ONSHIP
II, 01 DESIGN
f
_
A. INFLOW HYDROGRAPHS
' 1• PRE-DEVELOPEMENT
OFF-SITE AREA 1.50 ACRES
(<1/4 AC LOTS) C= 0.35
ON-SITE AREA 13.30 ACRES
(UNIMPROVED) C. 0.35
14.6 ACRES C= 0.35
TIME OF CONCENTRATION
' HYDRAULIC PATH VELOCITY LENGTH TIME
SHEET FLOW •5 fps 300 ft 600 sec
CHANNEL FLOW 6.0 fps ft sec
600 sec
' Tc = 10.0 min
PEAK FLO W Q = CIA
' I(2) 4.3 in/hr
I(10) = 5-8 in/hr
I(100) = 6.0 in/hr

j2(2) = 22.3 CFS
9(l0) = 30.0 CFS
Q(100) = 41.4 CFS

2• POST-DEVELOPEMENT
OFF-SITE AREA
(<1/4 AC
ON-SITE LOTS) 1-S ACRES
AREA 38.85% IMPERVIOUS C. 0.35
i
IMPERVIOUS 5.75 ACRES C. 0.95
LAWN 7.55 ACRES 0.35
SITE DRAINAGE AREA AVERAGE 0.61
' COMPOSITE 14.6 ACRES C. 0.56
TIME OF CONCENTRATION
HYDRAULIC PATH VELOCITY LENGTH TIME
' SHEET FLOW 5 fps 250 ft 500 sec
CHANNEL FLOW 6.0 fps 600 ft 100 sec
600 sec
' Tc = 10.0 min
PEAK FLO W Q CIA
I(2) 4.3 in/hr
' I(10) = 5.8 in/hr
I(100)= 8.0 in/hr
Q(2) 37.1 CFS
Q(10) _ 50.1 CFS
Q(100) = 69.0 CFS
' DEPTH OF RUNOFF
2-YEAR 6-HOUR PRECIPATION (P) = 2.52 in
10-YEAR 6-HOUR PRECIPATION (P) = 3.71 in
100-YEAR 6-HOUR PRECIPATION (P) = 4.93 in
' CN - 83
S = (1000/CN)-10 = 2.05 in
RUNOFF DEPTH(Q=) _ (P-0.2 x S)A2/(P-0.6 x S) = 1.07 in 2-YEAR 6-HOUR RUNOFF DEPTH
RUNOFF DEPTH(Qs) _ (P-0.2 x S)•2/(P.0.6 x S) - 2.04 in 10-YEAR 6-HOUR RUNOFF DEPTH
' RUNOFF DEPTH (Q=) _ (P-0.2 x S)?21 P+0.8 x S) = 3.11 in 100-YEAR 6-HOUR RUNOFF DEPTH
TIME OT PEAK RUNOFF VOLUME/(1.39 x Qp 2-YEAR 16.59 min
TIME OT PEAK = RUNOFF VOLUME/(1.39 x Qp 30-YEAR 26.21 min
' TIME OT PEAK = RUNOFF VOLUME/(1.39 x Qp 100-YEAR 21.03 min

ESTIMATE STORAGE
1. S = (Q(Post)-Q(Pre)) * Tp
S = 8901 CF
2. POND ELEVATIONS/AREA/VOLUME
CUMULATIVE
TEMP\PERM SED STORAGE REQI D 30655 CF 30655 CF
PERMANENT STORAGE REQ'D 6716 CF 37571 CF
ESTIMATED STAGE STORAGE 8901 CF 46472 CF
ASSUME POND INVERT (BOTTOM OF POND) = 643.0
SEDIMENT STORAGE REQUIRED 6716 CF
WATER QUALITY SURFACE AREA REQUIRED 10665 SF
ACCUMALATED Z
ELEV AREA VOLUME VOLUME STAGE In S In Z
843.00 6092 0 0 0.0
844.00 13577 9588 9586 1.0 9.168 0.000
845.00 16436 14984 24572 2.0 10.109 0.693
646.00 16363 17391 41962 3.0 10.645 1.099
647.00 20360 19353 61315 4.0 11.024 1.386
646.00 22426 21365 82700 5.0 11.323 1.609
649.00 24561 23485 106165 6.0 11.573 1.792
650.00 26765 25655 131640 7.0 11.769 1.946
851.00 36266 31396 163237 6.0 12.003 2.079
852.00 36816 37535 200772 9.0 12.210 2.197
653.00 41434 40116 240869 10.0 12.392 2.303
654:00 44120 42-770 283659 11.0 12.556 2.396
655.00 46674 45490 329149 12.0 12.704 2.465
656.00 49696 46279 377429 13.0 12.841 2.565
857.00 52591 51136 426566 14.0 12.966 2.639
658.00 55552 105196 482624 15.0 13.067 2.708
AVERAGE = 12.069 1.964
ASSUME SEDIMENT STORAGE EL EVATION = 846.5
SEDIMENT STORAGE VOLUME PERMANENT = 33557 CF
ASSUME ORIFICE ELEVATION = 649.50
SURFACE AREA PROVIDED = 56242 SF
PERMANENT WATER QUALITY VOLUME = 67434 CF
ASSUME RISOR ELEVATION = 650.50
TEMPORARY WATER QUALITY VOLUME = 30540 CF
ASSUME EMERGENCY SPILLWAY ELEVATION = 651.50
ASSUME BARREL INVERT ELEVATION 846.5
3. REGRESSION ANALYSIS SUMMARY OUTPUT PERFORMED ON LAST 7 ENTRIES
Where
b=(sum(ln(Z)*ln(Z) 1-1/n*sum(ln(Z))*su m(ln(S)))/(s um(ln(Z)A2)-1/ns(sum(l n(S)))•2)
b= 1.57
a=1/n*sum(ln(S))-b/n*sum(ln(Z))
as 6.76
RA2=(sum (In(Z)*In(S))-nsIn(Z)_ln(S)_) A2/((sum(ln( Z) .2)-n*ln(Z)_ •2)*(sum (In(S)•2)-n*ln(S)_•2)
RA2- 1.00
Ks=era
Ks= 6371
SEDIMENT
Z STORAGE
est ELEV
0.00 646.50
1.30
2.36
3.32
4.22
5.10
5.46
6.66
7.66
8.97
10.07
11.17
12.26
13.40
14.53
15.67
646.50
6716 CF REQUIRED
1066S SF REQUIRED
21472 CF REQUIRED
C. OUTLET STRUCTURES
1. PRINCIPLE SPILLWAY
INVERT ELEVATION 846.5
ASSUME RISOR ELEVATION = 850.5
SOLVE FOR ROUGH RISOR SIZE i 30.0 CFS
DIAMETER(in)=Qs12/(Cw*(H-3/2)s 3.14159)
ROUGH DIAMETER = 41 in
SOLVE FOR ROUGH BARREL SIZE
DIAMETER(in)- (0s4/(3.14159sCd :(2sgsh). .5)•.5
ROUGH DIAMETER = 24 in
ASSUME RISOR DIA 36 in 36
ASSUME BARREL DIA 24 in 24
ASSUME ORIFICE PLATE DIA 24 in 24
2. EMERGEN CY SPILLWAY
SOLVE FOR WEIR LENGTH USE h= 1.0 ft
ASSUME SPILLWAY ELEV = 651.5
L-Q/(Cwsh•3/2)
where Q(100) 69.0 cfs
RISOR Q i ELEV 850.50 = 26.2 cfs
EMERGENCY SPILLWAY Q = 42.6 cfs
WEIR LGTH (ft) 14 ft
100-YEAR H.W.L. 851.90
TOP OF DAM = 853.5
WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
ELEV RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
650.5 0.0 26.2 0.0 0.0 0.0 0.0
850.7 2.6 27.1 15.2 2.6 0.0 2.6
650.9 7.9 27.9 21.5 7.9 0.0 7.9
851.1 14.5 28.7 26.4 14.5 0.0 14.5
851.3 22.3 29.5 30.4 22.3 0.0 22.3
851.5 31.1 30.3 34.0 30.3 0.0 30.3
851.7 40.9 31.0 37.3 31.0 2.7 33.7
851.9 51.5 31.7 40.3 31.7 7.6 39.3
852.1 62.9 32.4 43.1 32.4 13.9 46.4
652.3 75.1 33.1 45.7 33.1 21.5 54.6
652.5 88.0 33.8 48.1 33.6 30.0 63.8
652.7 101.5 34.5 50.5 34.5 39.4 73.9
652.9 115.6 35.2 52.7 35.2 49.7 84.8
653.1 130.4 35.8 54.9 35.8 60.7 96.5
ALLOWABLE OUTFLOW = 30.0 CFS
II
t

r

D. ROUTING 2. 10 L 100 YEAR POST-DEVELOPEMENT STORM TNRU POND
1. INPUT DA TA FOR 2-YEAR STO RM
Q(2) 37.1
TO 16.54
TIME INCREMENT 2.00 min
Ks 6371
b 1.57
INVERT ELEVATION 643.00
ORIFICE ELEVATIO N 849.50
RISOR ELEVATION 650.50
PERMANENT STORAG E 151532
En SPILLWAY ELEV 651.50
TIME INFLOW STORAGE STAGE
0.00 0.0 120992 649.50
2.00 1.0 121055 849.50
4.00 4.1 121363 849.51
6.00 6.7 122132 649.54
6.00 14.5 123529 649.59
10.00 20.6 125646 649.66
12.00 26.7 126496 849.75
14.00 31.6 132009 849.67
16.00 35.4 136038 650.00
16.00 37.0 140361 650.14
20.00 36.6 144797 850.24
22.00 34.1 149039 650.42
24.00 30.1 152674 850.54
26.00 26.1 156129 650.64
28.00 22.7 156759 650.73
30.00 19.6 160819 650.79
32.00 17.2 162361 650.84
34.00 14.9 163520 650.67
36.00 13.0 164307 850.90
36.00 11.3 164807 850.91
40.00 9.6 165075 850.92
42.00 8.5 165156 850.92
44.00 7.4 165096 650.92
46.00 6.5 164922 850.91
46.00 5.6 164663 650.91
50.00 4.4 164341 650.90
52.00 4.2 163974 850.89
54.00 3.7 163577 850.87
56.00 3.2 163159 850.66
58.00 2.6 162732 650.65
60.00 2.4 162300 850.63
62.00 2.1 161871 850.82
64.00 1.6 161446 650.61
66.00 1.6 161034 850.60
68.00 1.4 160631 850.76
70.00 1.2 160242 650.77
72.00 1.0 159666 650.76
74.00 0.9 159506 850.75
76.00 0.8 159160 850.74
78.00 0.7 158830 850.73
60.00 0.6 158514 850.72
62.00 0.5 156214 850.71
64.00 0.5 157926 650.70

PEAK INFLOW 37.1 CFS
PEAK OUTFLOW = 8.5 CFS
PEAK ALLOWABLE OUTFLOW 22.3 CFS
PEAK ELEV 650.92
PEAK STORAGE = 165156 CF
WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.3 26.4 7.0 0.3 0.0 0.3
1.7 26.8 12.9 1.7 0.0 1.7
3.3 27.2 16.2 3.3 0.0 3.3
4.6 27.4 18.3 4.8 0.0 4.8
6.1 27.6 19.8 6.1 0.0 6.1
7.1 27.6 20.6 7.1 0.0 7.1
7.6 27.9 21.4 7.6 0.0 7.8
8.2 27.9 21.6 8.2 0.0 8.2
6.5 28.0 22.0 8.5 0.0 8.5
6.5 26.0 22.1 6.5 0.0 6.5
6.5 26.0 22.1 6.5 0.0 6.5
6.3 28.0 21.9 8.3 0.0 8.3
6.1 27.9 21.7 6.1 0.0 6.1
7.8 27.9 21.4 7.6 0.0 7.8
7.5 27.6 21.1 7.5 0.0 7.5
7.1 27.6 20.6 7.1 0.0 7.1
6.7 27.7 20.4 6.7 0.0 6.7
6.4 27.7 20.1 6.4 0.0 6.4
6.0 27.6 19.7 6.0 0.0 6.0
5.7 27.6 19.3 5.7 0.0 S.7
5.3 27.5 16.9 5.3 0.0 5.3
5.0 27.5 18.5 5.0 0.0 5.0
4.7 27.4 18.1 4.7 0.0 4.7
4.4 27.4 17.7 4.4 0.0 4.4
4.1 27.3 17.3 4.1 0.0 4.1
3.4 27.3 17.0 3.9 0.0 3.9
3.6 27.2 16.6 3.6 0.0 3.6
3.4 27.2 16.2 3.4 0.0 3.4
3.2 27.1 15.9 3.2 0.0 3.2
3.0 27.1 15.5 3.0 0.0 3.0
2.6 27.1 15.2 2.8 0.0 2.8
'
2. INPUT DA TA FOR 10-YEAR ST ORM
9(10) so
Tp 26.21 min
TIME INCREMENT 2.00 min

, Ks 6371
t
b 1.57
INVERT ELEVATION 643.00
ORIFICE ELEVATION 649.50
RISOR ELEVATION 850.50
PERMANENT STORAGE 120992
' EM SPILLWAY ELEV 651.50
TIME INFLOW STORAGE STAGE
0.00 0.0 120992 649.50
2.00 0.7 121035 649.50
4.00 2.8 121247 649.51
6.00 6.2 121766 849.53
' 6.00 10.7 122799 649.56
10.00 15.9 124394 649.62
12.00 21.7 126653 849.69
14.00 27.7 129619 649.79
e 16.00 33.5 133294 849.91
18.00 38.9 137640 850.06
20.00 43.4 142579 650.22
22.00 46.9 146002 650.39
24.00 49.2 153735 850.57
26.00 50.0 159427 650.75
28.00 49.5 164665 650.91
30.00
32.00 47.5
44.3 169264
173017 851.05
651.16
34.00 40.2 175665 651.25
36.aa 36.4 177932 651.31
36.00 33.0 179292 651.35
1 40.00 29.9 160095 651.37
42.00 27.1 160452 651.36
44.00 24.5 180456 651.36
46.00 22.2 160193 651.37
46.00 20.1 179720 651.36
50.00 18.2 179091 651.34
52.00 16.5 176350 651.32
54.00 14.4 177530 651.29
56.00 13.5 176657 651.27
58.00 12.2 175753 651.24
60.00 11.1 174634 851.21
62.00 10.0 173913 851.19
64.00 9.1 172999 651.16
66.00 6.2 172101 651.13
68.00 7.4 171224 651.11
70-Oa 6.7 170371 651.08
72.00 6.1 169545 651.06
74.00 5.5 168749 851.03
76.00 5.0 167984 651.01
76.00 4.5 167249 850.99
80.00 4.1 166546 650.96
62.00 3.7 165873 650.94
84.00 3.4 165231 650.42
86.00 3.1 164616 850.91
66.00 2.6 164035 650.69
PEAK INFLOW = 50.05 CFS
' PEAK OUTFLOW = 25.72 CFS
PEAK ALLOWABLE OUTFLOW 30.04 CFS
PEAK ELEV = 651.38
PEAK STORAGE = 180456 CF
WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
0.0 0.0 11.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 a-a 0.0
0.0 0.0 B-0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 B.0 0.0 0.0 0.0
a.o 0.0 0.0 o.B 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 9.0 a-a a-a 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.6 26.5 8.9 0.6 0.0 0.6
3.8 27.3 16.9 3.8 0.0 3.8
8.1 27.9 21.7 8.1 0.0 6.1
12.6 26.5 25.2 12.6 0.0 12.6
16.7 26.9 27.6 16.7 0.0 16.7
20.0 29.3 29.4 20.0 0.0 20.0
22.5 29.5 30.6 22.5 0.0 22.5
24.2 29.7 31.3 24.2 0.0 24.2
25.3 29.6 31.8 25.3 0.0 25.3
25.7 29.6 31.9 25.7 0.0 25.7
25.7 29.6 31.9 25.7 0.0 25.7
25.4 29.6 31.8 25.4 0.0 25.4
24.6 29.7 31.5 24.8 0.0 24.8
24.0 29.6 31.2 24.0 0.0 24.0
23.0 29.6 30.8 23.0 0.0 23-a
22.0 29.5 30.3 22.0 0.0 22.0
21.0 29.4 29.6 21.0 0.0 21.0
19.9 29.3 29.3 19.9 0.0 19.9
18.8 29.2 26.8 16.6 0.0 18.8
17.7 29.0 28.2 17.7 0.0 17.7
16.6 26.9 27.6 16.6 0.0 16.6
15.6 28.6 27.1 15.6 0.0 15.6
14.7 28.7 26.5 14.7 0.0 14.7
13.7 28.6 25.9 13.7 0.0 13.7
12.9 26.5 25.4 12.9 0.0 12.9
12.0 26.4 24.8 12.0 0.0 12.0
11.3 28.3 24.3 11.3 0.0 11.3
10.5 28.2 23.7 10.5 0.0 10.5
9.6 28.2 23.2 9.6 0.0 9.8
9.2 26.1 22.7 9.2 0.0 9.2
8.6 28.0 22.2 6.6 0.0 8.6
6.0 27.9 21.7 8.0 0.0 8.0
7.5 27.6 21.2 7.5 a-a 7.5

3. INPUT DATA FOR 100-YEAR STORM
9(100)
Tp
TIME INCREMENT
Ks
6
INVERT ELEVATION
ORIFICE ELEVATION
RISOR ELEVATION
PERMANENT STORA GE
EM SPILLWAY ELE V
TIME INFLOW STORAGE
0.00 0.0 120992
2.00 0.6 121040
4.00 3.2 121280
6.00 7.0 121892
6-Oa 12.2 12304
10.00 16.3 12467
12.00 25.2 12744
14.00 32.6 13095
16.00 40.1 13531
16.00 47.2 14055
20.00 53.8 14662
22.00 59.5 15339
24-DO 64.1 16050
26.00 67.2 16746
26.00 66.6 17392
30.00 66.8 17%3
32.00 67.3 18451
34.00 64.2 16866
36.00 59.7 19211
38.00 54.6 19475
40.00 49.4 1%56
42.00 45.7 19773
44.00 41.8 19829
46.00 38.2 19637
48.00 34.9 19805
50.00 31.9 19741
52.00 24.2 19650
54.00 26.7 19539
56.00 24.4 19411
58.00 22.3 19269
60.00 20.4 19116
62.00 18.6 18954
64.00 17.0 16764
66.00 15.6 16606
66.00 14.3 18420
70.00 13.0 16233
72.00 11.9 16056
74.00 10.9 17897
76.00 10.0 17747
78.00 9.1 17606
60.00 6.3 17479
62.00 7.6 17356
84.00 7.0 17246
86.00 6.4 17140
88.00 5.8 17041
90.00 5.3 1694q
92.00 4.9 16861
94.00 4.4 16779
96.00 4.1 16702
98.00 3.7 1662
PEAK INFLOW =
PEAK OUTFLOW =
PEAK ELEV =
PEAK STORAGE _
69
29.03 min
2.00 min
6371
1.57
843-00
649.50
650.50
120992
851.50
STAGE
649.50
849.50
849.51
849.53
3 849.57
2 849.63
6 849.72
7 649.64
7 849.96
5 850.15
0 650.34
5 850.56
9 850.78
4 850.99
0 851.19
9 851.36
0 851.50
1 851.62
9 651.72
1 851.80
7 651.65
3 651.68
5 651.90
4 851.90
4 851.89
1 853.67
7 651.85
2 851.82
0 651.76
2 851.74
4 651.69
4 851.65
4 651.60
7 651.55
1 651.49
4 851.44
6 651.38
2 851.34
7 651.29
6 851.25
5 651.21
9 851.16
2 851.14
7 651.31
9 851.08
1 851.05
9 651.03
9 851.00
7 850.96
99 850.96
69.04 CFS
39.35 CFS
WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
0.0 0.0 0.0 0.0 0.0 0.0
a.a 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.a 0.0 0.0 0.0 0.a 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.4 26.5 6.2 0.4 0.0 0.4
4.6 27.4 18.0 4.6 0.0 4.6
10.7 28.3 23.9 30.7 0.0 10.7
17.7 29.0 26.2 17.7 0.0 17.7
24.7 29.7 31.5 24.7 0.0 24.7
31.1 30.3 34.0 30.3 0.0 30.3
36.9 30.7 36.0 30.7 1.3 32.0
42.0 31.1 37.6 31.1 3.1 34.2
46.0 31.4 36.8 31.4 4.9 36.2
46.6 31.5 39.5 31.5 6.2 37.8
50.6 31.7 40.0 31.7 7.1 38.6
51.5 31.7 40.3 31.7 7.6 39.3
51.6 31.7 40.3 31.7 7.6 39.4
51.1 31.7 40.2 31.7 7.4 39.1
50.1 31.6 39.9 31.6 6.6 38.5
48.7 31.5 39.5 31.5 6.1 37.7
46.9 31.4 39.0 31.4 5.3 36.7
45.0 31.3 36.5 31.3 4.4 35.7
42.6 31.1 37.9 31.1 3.5 34.6
40.6 31.0 37.2 31.0 2.6 33.5
36.2 30.8 36.5 30.6 1.7 32.5
35.8 30.6 35.7 30.6 0.9 31.5
33.3 30.4 34.8 30.4 0.3 30.7
30.7 30.2 33.9 30.2 0.0 30.2
26.2 30.0 32.9 26.2 0.0 28.2
25.9 29.8 32.0 25.9 0.0 25.9
23.6 29.6 31.1 23.8 0.0 23.6
22.0 29.5 30.3 22.0 0.0 22.0
20.3 29.3 29.5 20.3 0.0 20.3
16.7 29.1 28.7 16.7 0.0 16.7
17.3 29.0 26.0 17.3 0.0 17.3
16.0 26.9 27.3 16.0 0.0 16.0
14.9 26.7 26.6 14.9 0.0 14.9
13.6 28.6 26.0 13.8 0.0 13.6
12.8 28.5 25.3 12.6 0.0 12.6
11.9 26.4 24.7 11.9 0.0 11.9
11.1 26.3 24.1 11.1 0.0 11.1
10.3 28.2 23.6 10.3 0.0 10.3
9.6 26.1 23.0 9.6 0.0 9.6
851.90 EMERGENCY SPILLWAY ACTIVATED
196374 CF
t
t
E. ORIFICE HOLE
4 -DAY RELEASE
NUMBER OF HOLES 2
AVERAGE SURFACE AREA 30540 SF
DETENTION DEPTH 1.00 FT
a 0.415/t*As(h)w.5
a = 5.28 SQ IN
d = 1.83 IN
8 -DAY RELEASE
NUMBER OF HOLES 2
AVERAGE SURFACE AREA 30540 SF
DETENTION DEPTH 1.00 FT
a = 0.415/t*A=(h)A•5
a = 2.64 SQ IN
d = 1.30 IN
AVE d = 1.57 IN
F. FLOTATION OF RISOR
VOLUME OF RISOR
ASSUME INVERT ELEV =
ASSUME RISOR ELEV
RISOR DIAMETER =
V = 3.14159irA2th
V = 28.3 CF
VOLUME OF BARREL
i
1
1
1
1
1
1
i
ASSUME LENGTH =
BARREL DIAMETER =
V = 3.14159:r•2:L
V = 47.1 CF
TOTAL VOLUME
CONCRETE REQ'D
DISPLACED WATER
WEIGHT OF CONCRETE (BOUYANT)
CONCRETE REQ'D
RISOR AREA
CONCRETE REQ'D
ADD 15% SAFETY FACTOR
1 13/16 in
1 5/16 in
1 9/16 in
846.5
650.5
36 in
15.00 ft
24 in
= 75.4 CF
= 4705 LB
= 67.60 LB/CF
= 53.7 CF
= 7.1 SF
= 7.6 LF
= 8.7 LF
61.6 CF

e SUMMARY
TOP OF DAM
300-YEAR HIGH WATER
10-YEAR HIGH WATER
' EMERGENCY SPILLWAY ELEV
RISOR ELEV
ORIFICE ELEV
INVERT ELEV
SEDIMENT STORAGE REQUIRED
SEDIMENT STORAGE PROVIDED
SURFACE AREA REQUIRED
1 SURFACE AREA PROVIDED
RISOR DIAMETER
BARREL DIAMETER
ORIFICE PLATE DIAMETER
ORIFICE HOLE #/DIAMETER
WEIR LENGTH

2 a
853.5
651.9
851.4
851.5
650.50
841.50
846.5
6716 CF
33557 CF
10865 SF
56242 SF
36 in
24 in
24 in
1.83 in
14 ft
JAMESTOWN ENGINEERING GROUP, INC.
117 E. MAIN STREET
JAMESTOWN, NC 27282
DESIGN OF WATER QUALITY POND NO. 2
GT""'RAL
DESIGN CRITERIA
DESIGN IS BASED UPON CITY OF HIGH POINT STORMWATER GUIDELINES
' FOR WATER QUALITY AND FLOOD CONTROL, IN CONJUNCTION WITH ENVIRONMENTAL
REGULATIONS. ARTICLE A. SECTION 9-7-5 FOR WATERSHED CRITICAL AREAS.
B. SITE INFORMATION
THE PROPOSED SITE IS LOCATED WITHIN THE OAK HOLLOW GENERAL WATERSHED
GENERAL SITE DATA IS LISTED BELOW:
POND $2
SITE AREA 16.5
' OFF-SITE AREA 0.00
16.50
TOTAL SITE AREA
OFF-SITE DRAINAGE AREA 0.00
SITE DRAINAGE AREA 16.5
DISTURBED AREA 16.5
s UNITS PROPOSED (MULTI-FAMILY) I1S.S
s UNITS PROPOSED (SINGLE FAMILY) 10
IMPERVIOUS AREA SF/UNIT (SINGLE FAMILY) 3000
SF/UNIT (MULTI-FAMILY) 2200
IMPERVIOUS AREA (SINGLE FAMI 0.69
IMPERVIOUS AREA (MULTI- FAMI 5.83
UNITS (TOTAL) 6.52
SIDEWALKS. POOL
STREETS 2.36
,
0%: ADJACENT LOT @ .00 AC 0.00
TOTAL 8.88
% BUILT UPON (FOR SITE DRAINAGE AREA) 53.83:
% BUILT UPON (FOR TOTAL SITE AREA) 53.83:
DU/ACRE (SITE) 7.6
IN ACCORDANCE WITH TABLE 7-5-1 A WET DETENTION POND IS REQU IRED
C. WET POND INFORMATION/REQUIREMENTS
1 3
VOLUME REQUIREMENTS OF POND 1
8% IMPERVIOUS @ 3.4 ft
53 2.03% OF DRAINAGE AREA
.
POOL SURFACE AREA REQUIRED .020 x 16.50 x 43560 - 14573 SF
1/8 PERM SED STORAGE .125 x 16.50 x 3630 7487 CF
29948 CF
1 1/2 TEMP SED STORAGE S00 x 16.50 x 3630
37434 CF
TOTAISEDIMENT STORAGE VOLUME REQUIRED
RUNOFF VOLUME - 1.0in x Rv x DA where Rv - 0.05 + 0.009 (I)
CF
0 in
1 x 0.53 x 16.50 - 32012
.
TEMPORARY VOLUME -

I
I'

METHOD OF ANALYSIS
D
.
INFLOW HYDROGRAPHS: SMALL WATERSHED METHOD
' PEAK INFLOWS: RATIONAL METHOD
REGRESSION ANALYSIS FOR STAGE STORAGE
RELATIONSHIP
POND ROUTING:
P,,,.d it DESIGN
A. INFLOW HYDROGRAPHS
1. PRE-DEVELOPEMENT
OFF-SITE AREA 0.00 ACRES
C. 0.35
(<1/4 AC LOTS)
ON-SITE AREA 16.50 ACRES
(UNIMPROVED) C.
16.S ACRES C. 0.35
0.35
TIME OF CONCENTRATION
HYDRAULIC PATH VELOCITY LENGTH TIME
1 SHEET FLOW 5 fps 300 ft 600 sec
CHANNEL FLOW 8.0 fps ft sec
600 sec
Tc 10.0 sin
Q - CIA
PEAK FLOW
1(2) 4.3 in/hr
I(10) - S.8 in/hr
' I(100) 8.0 in/hr
Q(2) 24.8 CFS
Q(SO) 33.5 CFS
Q(100) - 46.2 CFS
2. POST-DEVELOPEMENT
OFF-SITE AREA
(<1/4 AC LOTS) 0 ACRES C. 0.35
ON-SITE AREA 53.83: IMPERVIOUS
IMPERVIOUS 8.68 ACRES C- 0.95
LAWN 7.62 ACRES 0.35
SITE DRAINAGE AREA AVERAGE 0.67
COMPOSITE 16.S ACRES C. 0.67
TIME OF CONCENTRATION
HYDRAULIC PATH VELOCITY LENGTH TIME
SHEET FLOW S fps 2S0 ft S00 sec
CHANNEL FLOW B.0 fps 800 ft 100 sec
600 sec
Tc - 10.0 sin
PEAK FLOW Q CIA
1(2) 4.3 in/hr
I(10) - S.S in/hr
8 0 in/hr
I(100)-
-
0(2) 47.7 CFS
Q(10) - 64.4 CFS
0(100) - BB.8 CFS
DEPTH OF RUNOFF
2-YEAR 6-HOUR PRECIPATION (P) - 2.52 in
10-YEAR 6-HOUR PRECIPATION (P) - 3.71 in
100-YEAR 6-HOUR PRECIPATION (P) - 4.93 in
' CH - 83
S . (1000/CN)-10 - 2.05 in
YEAR 6-HOUR RUNOFF DEPTH
2
RUNOFF DEPTH(Q-) - (P-0.2 x S)"2/(P+0.8 x S) • 1.07 in -
RUNOFF DEPTH(Q•) - (P-0.2 x S)"2/(P+0.8 x S) - 2.04 in 10-YEAR 6-HOUR RUNOFF DEPTH
RUNOFF DEPTH(Q•) - (P-0.2 x S)"2/(P+0.8 x S) - 3.11 in 100-YEAR 6-HOUR RUNOFF DEPTH
TIME OT PEAK - RUNOFF VOLUME/(1.39 x Qp:2-YEAR 16.11 sin
TIME OT PEAK - RUNOFF VOLUMF/(1.39 x Qp.10-YEAR 22.71 sin
TIME OT PEAK - RUNOFF VOLUME/(1.39 x Op. 100-YEAR 2S.1S sin

1
D. ESTIMATE STORAGE
1. S - (Q(Post)-Q(Pre)) • TP
S - 13749 CF
POND ELEVATIONS/AREA/VOLUME
2
. CUMULATIVE
j
TEMP\PERM SID STORAGE REQ'D 37434 CF 37434 CF
PERMANENT STORAGE REQ'D 7487 CF 44921 CF
ESTIMATED STAGE STORAGE 13749 CF 58671 CF
ASSUME POND INVERT (DOTIOM OF POND) 843.0
SEDIMENT STORAGE REQUIRED 7487 CF
VATER QUALITY SURFACE AREA REQUIRED - 14573 SF
ACCUHALATID Z
ELEV AREA VOLUME VOLUME STAGE In S In Z
843.00 4056 0 0 0.0
844.00 5081 4559 4559 1.0 8.425 0.000
845.00 6180 5622 10180 2.0 9.228 0.693
846.00 7368 6765 16946 3.0 9.738 1.099
847.00 8642 7997 24942 4.0 10.124 1.386
848.00 10095 9359 34301 5.0 10.443 1.609
849.00 11828 10950 45251 6.0 10.720 1.792
850.00 13623 12715 57966 7.0 10.968 1.946
851.00 21473 17400 71,366 8.0 11.230 2.079
652.00 23900 22676 98042 9.0 11.493 2.197
853.00 26463 25171 123212 10.0 11.722 2.303
854.00 28637 27543 150755 11.0 11.923 2.390
855.00 31119 29869 180625 12.0 12.104 2.485
856.00 32500 31807 212432 13.0 12.266 2.565
857.00 35000 33742 246174 14.0 12.414 2.639
858.00 38000 70428 282860 15.0 12.553 2.708
AVERAGE - 11.078 1.964
ASSUME SEDIMENT STORAGE ELEVATION 847.0
SEDIMENT STORAGE VOLUME PERMANENT =
21986 CF
ASSUME ORIFICE ELEVATION 850.40
SURFACE AREA PROVIDED - 16763 SF
PERMANENT VATER QUALITY VOLUME - 47921 CF
ASSUME RISOR ELEVATI02l 852.30
1 TEMPORARY VATER QUALITY VOLUME =
36269 CF
ASSUME EMERGENCY SPILLVAY ELEVATION 853.70
ASSUME BARREL INVERT ELEVATION 847.0
3. REGRESSION ANALYSIS SUMMARY OUTPUT PERFORMED ON LAST 8 ENTRIES
where
b-(sus(ln(Z)•ln(Z))-1/n•sum(ln(Z)).sum(ln(S)))/(sua(ln(Z)'2)-1 /n•(sun (ln (S)))"2)
b. 1.83
a-1/n-sum(ln(S))-b/nmsum(In(Z))
a- 7.49
R"2-(sus(In(Z)+ln(S))-n•ln(Z)_ln(S)_)"2/((sua(ln (z)"2)-n+ln(Z) _"2)-(sus( ln(S)"2)-n +ln(S)_"2)
R"2. 0.99
Ks-e"a
Ks- 1798

I
SEDIMENT
Z STORAGE
est ELEV
0.00
1.66 847.10
2.58
3.41
4.21
5.01
5.83
6.68
7.71
8.90
10.09
11.27
12.44
13.59
14.73
15.89
847.10
7487 CF REQUIRED
14573 SF REQUIRED
32012 CF REQUIRED
C. OUTLET STRUCTURES
1. PRINCIPLE SPILLWAY
INVERT ELEVATION 847.0
ASSUME RISOR ELEVATION 852.3
SOLVE FOR ROUGH RISOR SIZE P 33.5 CFS
DIAMETER(in)-Q-12/(Cv-(H"3/2)• 3.14159)
ROUGH DIAMETER - 33 in
SOLVE FOR ROUGH BARREL SIZE
DIAMETER(in)- (Q-4/(3.14159-Cd -(2-9-h)". 5)".5
ROUGH DIAMETER - 24 in
ASSUME RISOR DIA - 36 in 36
ASSUME BARREL DIA 24 in 24
ASSUME ORIFICE PLATE DIA 22 in 24
2. EMERGEN CY SPILLWAY
1 SOLVE FOR WEIR LENGTH USE h- 1.0 ft
ASSUME SPILLWAY ELEV = 853.7
L-Q/(Cv-h'3/2)
vhere Q(100) - 88.8 cfs
RISOR 0 @ ELEV 852.30 26.4 cfs
EMERGENCY SPILLWAY 0 62.S cfs
WEIR LGTH (ft) 21 ft
100-YEAR H.Y.L. 854.30
TOP OF DAM 855.7
' WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
ELEV RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
852.3 0.0 26.4 0.0 0.0 0.0 0.0
8S2.S 2.8 27.0 15.2 2.8 0.0 2.8
852.7 7.9 27.6 21.5 7.9 0.0 7.9
852.9 14.S 28.1 26.4 14.S 0.0 14.S
853.1 22.3 28.7 30.4 22.3 0.0 22.3
853.3 31.1 29.3 34.0 29.3 0.0 29.3
853.5 40.9 29.8 37.3 29.8 0.0 29.8
853.7 51.S 30.3 40.3 30.3 0.0 30.3
853.9 62.9 30.9 43.1 30.9 S.4 36.2
854.1 7S.1 31.4 45.7 31.4 1S.2 46.6
BS4.3 88.0 31.9 48.1 31.9 27.9 59.8
854.5 101.5 32.4 50.5 32.4 42.9 75.3
854.7 115.6 32.9 S2.7 32.9 60.0 92.9
BS4.9 130.4 33.4 54.9 33.4 78.9 112.3
ALLOWABLE OUTFLOW - 33.5 CFS

D. ROUTING 2. 10 & 100 YEAR POST-DEVELOPEHENT STORH TRRU POND
1 INPUT DATA FOR 2-YEAR STOR K
O(2) 47.7
T 16.11
TINE INCREMENT 2.00 in
Ks 1798
b 1.83
INVERT ELEVATION 843.00
ORIFICE ELEVATION 850.40
RISOR ELEVATION 852.30
PERKAHEHT STORAGE 106177
EX SPILLWAY ELEV 853.70
WEIR
ORIFICE
ORIFICE
PRINCIPAL
EMERGENCY
TOTAL
INFLOW STORAGE STAGE RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
TIKE
0
00 0
0 69907 850.40 0.0 0.0 0.0 0.0 0.0 0.0
.
.
8
00 1
2 70015 850.41 0.0 0.0 0.0 0.0 0.0 0.0
.
.
9
00 6
4 70537 BS0.44 0.0 0.0 0.0 0.0 0.0 0.0

I .
.
6
00 14
6 71825 850.51 0.0 0.0 0.0 0.0 0.0 0.0

a .
.
00 23.6
8 74116 850.64 0.0 0.0 0.0 0.0 0.0 0.0
II .
7
00 32
10 77496 BS0.83 0.0 0.0 0.0 0.0 0.0 0.0
.
.
5
00 40
12 81889 BS1.07 0.0 0.0 0.0 0.0 0.0 0.0
.
.
8
00 45
14 87064 851.34 0.0 0.0 0.0 0.0 0.0 0.0

1 .
.
16.00 47.7 92674 851.63

92
851 0.0

0
0 0.0

0.0 0.0

0.0 0.0

0.0 0.0

0.0 0.0

0.0
18.00 46.1 98307 . . 0
0
2
00 41
20 103547 852.17 0.0 0.0 0.0 0.0 0.0 .
.
.
00 35.1
22 108074 852.39 0.8 26.6 10.2 0.0 0.0 0.8
.
00 29.9
24 111674 BS2.S6 4.1 27.1 17.4 4.1 0.0 4.1
' .
00 25.4
26 114301 852.68 7.4 27.5 21.1 7.4 0.0 7.4
.
00 21.6
28 116090 852.77 9.9 27.7 23.2 9.9 0.0 9.9
.
00 18.4
30 117208 852.82 11.5 27.9 24.5 11.5 0.0 11.5
.
00 15.7
32 117810 852.84 12.5 28.0 25.1 12.5 0.0 12.5
.
00 13.3
34 118031 852.85 12.8 28.0 25.3 12.8 0.0 12.8

' .
00 11.3
36 117977 852.85 12.7 28.0 25.3 12.7 0.0 12.7
.
00 9.7
38 117730 852.84 12.4 28.0 25.0 12.4 0.0 12.4
.
00 8.2
40 117354 852.82 11.8 27.9 24.6 11.8 0.0 11.8

I .
00 7.0
42 116896 852.80 11.1 27.9 24.1 11.1 0.0 11.1
.
9
00 5
44 116389 852.78 10.3 27.8 23.6 10.3 0.0 10.3
II .
.
00 S.1
46 115059 852.75 9.5 27.7 22.9 9.5 0.0 9.5
.
00 4.3
48 115323 852.73 8.8 27.6 22.3 0.8 0.0 8.8
.
00 3.7
50 114794 852.71 8.0 27.6 21.7 8.0 0.0 8.0

) .
52.00 3.1 114279
113765 852.68
66
852 7.3

7
6 27.5

27.4 21.0

20.4 7.3

6.7 0.0

0.0 7.3

6.7
- 54.00 2.7
00 2.3
56 113314 .
852.64 .
6.1 27.4 19.8 6.1 0.0 6.1
.
00 1.9
58 112868 852.62 5.5 27.3 19.1 S.S 0.0 S.5
.
00 1.6
60 112449 BS2.60 S.0 27.3 18.5 S.0 0.0 5.0
.
00 1.4
62 112055 852.58 4.6 27.2 17.9 4.6 0.0 4.6
.
00 1.2
64 111687 852.56 4.1 27.1 17.4 4.1 0.0 4.1
.
00 1.0
66 111344 852.54 3.8 27.1 16.8 3.8 0.0 3.8
.
00 0.9
68 111024 BS2.53 3.4 27.1 16.3 3.4 0.0 3.4
' .
70.00 0.7 110727
110450 852.52
50
852 3.1
6
2 27.0
27.0 15.8
15.3 3.1
2.8 0.0
0.0 3.1
2.8
72.00 0.6
00 0.5
74 110193 .
BS2.49 .
2.6 26.9 14.9 2.6 0.0 2.6
.
00 0.4
76 109954 852.48 2.4 26.9 14.4 2.4 0.0 2.4
.
00 0.4
78 109732 852.47 2.2 26.9 14.0 2.2 0.0 2.2
.
00 0.3
80 109527 852.46 2.0 26.8 13.6 2.0 0.0 2.0
.
00 0.3
82 109335 852.45 1.8 26.8 13.2 1.8 0.0 1.8
.
84.00 0.2 109158 852.44 1.7 26.8 12.8 1.7 0.0 1.7
PEAK INFLOW 47.7 CFS
' PEAK OUTFLOV 12.8 CFS
PEAK ALLOWABLE OUTFLOW 24.8 CFS
PEAK ELEV - BS2.85
' PEAK STORAGE - 118031 CF

I
L
2. INPUT DATA FOR 10-YEAR STORM
0(10) 64
Tp 22.71 %in
TIME INCREMENT 2.00 ¦in
Ks 1798
b 1.83
INVERT ELEVATION 843.00
ORIFICE ELEVATION 850.40
RISOR ELEVATION 852.30
PERMANENT STORAGE 69907
E34 SPILLWAY ELEV
8S3.70
TIME INFLOW STORAGE STAGE
0.00 0.0 69907 850.40
2.00 1.2 69981 850.40
4.00 4.8 70342 850.43
6.00 10.5 71259 850.48
8.00 17.8 72955 850.57
10.00 26.2 75594 050.72
12.00 35.1 79271 850.93
14.00 43.7 83999 051.18
16.00 S1.5 89713 851.48
e 18.00 57.8 96271 851.82
20.00 62.2 103470 852.17
22.00 64.2 110860 852.52
24.00 63.9 117622 852.84
26.00 61.1 123098 853.08
28.00 56.2 127092 853.26
30.00 50.2 129953 853.39
32.00 44.8 132094 853.48
34.00 39.9 133593 853.54
36.00 35.6 134525 853.58
38.00 31.7 134958 8S3.60
40.00 28.3 134951 853.60
42.00 2S.2 134556 853.59
44.00 22.5 133822 853.55
46.00 20.1 132791 853.51
48.00 17.9 131499 853.45
50.00 16.0 129980 853.39
52.00 14.2 128265 853.31
i 54.00 12.7 126444 853.23
56.00 11.3 124728 853.16
58.00 10.1 123228 853.09
60.00 9.0 121904 853.03
' 62.00 8.0 12072S 852.98
64.00 7.2 119668 BS2.93
66.00 6.4 118716 852.89
68.00 5.7 117853 852.85
70.00 5.1 117067 852.81
' 72.00 4.5 116349 852.78
74.00 4.0 115691 852.7S
76.00 3.6 115087 852.72
I 78.00 3.2 114530 852.69
,
I 80.00 2.9 114016 052.67
I 82.00 2.6 113540 852.65
84.00 2.3 113100 852.63
86.00 2.0 112691 852.61
' 88.00 1.8 112312 852.59
PEAK INFLOW - 64. 40 CFS
PEAK OUTFLOW - 30. 09 CFS
PEAK ALLOWABLE OUTFLOW, 33. 50 CFS
' PEAK ELEV 853. 60
PEAK STOR AGE - 134958 CF

WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLO9
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
3.3 27.0 16.0 3.3 0.0 3.3
12.2 28.0 24.9 12.2 0.0 12.2
21.6 28.7 30.1 21.6 0.0 21.6
29.3 29.2 33.4 29.2 0.0 29.2
35.2 29.S 35.5 29.5 0.0 29.5
39.9 29.8 37.0 29.8 0.0 29.8
43.2 29.9 38.0 29.9 0.0 29.9
45.3 30.0 38.6 30.0 0.0 30.0
46.3 30.1 38.9 30.1 0.0 30.1
46.3 30.1 38.9 30.1 0.0 30.1
45.4 30.0 38.6 30.0 0.0 30.0
43.7 30.0 38.1 30.0 0.0 30.0
41.4 29.8 37.4 29.8 0.0 29.8
38.6 29.7 36.6 29.7 0.0 29.7
35.3 29.S 35.5 29.5 0.0 29.5
31.7 29.3 34.2 29.3 0.0 29.3
28.0 29.1 32.9 28.0 0.0 28.0
24.6 28.9 31.5 24.6 0.0 24.6
21.8 28.7 30.2 21.8 0.0 21.8
19.4 28.5 29.1 19.4 0.0 19.4
17.3 28.4 28.0 17.3 0.0 17.3
15.5 28.2 27.0 15.5 0.0 15.5
13.9 28.1 26.0 13.9 0.0 13.9
12.S 28.0 25.1 12.5 0.0 12.5
11.3 27.9 24.3 11.3 0.0 11.3
10.2 27.8 23.S 10.2 0.0 10.2
9.3 27.7 22.0 9.3 0.0 9.3
8.4 27.6 22.0 8.4 0.0 8.4
7.7 27.S 21.3 7.7 0.0 7.7
7.0 27.5 20.7 7.0 0.0 7.0
6.4 27.4 20.1 6.4 0.0 6.4
5.8 27.3 19.5 5.8 0.0 5.8
5.3 27.3 18.9 S.3 0.0 S.3
4.9 27.2 18.3 4.9 0.0 4.9

3. INPUT DATA FOR 100-YEAR STORK
0(100) 89
Tp 25.15 %in
TIME INCREMENT 2.00 ¦in
Ks 1798
b 1.83
e INVERT ELEVATION 813.00
ORIFICE ELEVATION 850.40
J RISOR ELEVATION 852.30
PERMANENT STORAGE 69907
EM SPILLWAY ELEV BS3.70
TIME INFLOW STORAGE STAGE
0.00 0.0 69907 850.40
2.00 1.4 69990 850.40
4.00 5.4 70398 850.43
6.00 11.9 71438 850.49
8.00 20.4 73376 850.60
10.00 30.4 76422 850.77
12.00 41.2 80719 851.01
14.00 S2.3 86330 851.31
16.00 62.8 93238 851.66
18.00 72.3 10134S 852.07
' 20.00 80.0 110316 652.SO
22.00 85.4 119194 852.91
24.00 88.4 126995 853.26
26.00 88.6 134067 8S3.S7
' 28.00 86.0 140698 053.85
30.00 80.9 145983 654.07
32.00 73.7 149373 854.21
34.00 66.S 151086 BS4.28
36.00 60.0 151595 854.30
' 38.00 S4.1 1S1317 854.29
40.00 48.8 150549 854.26
42.00 44.0 149487 854.21
44.00 39.7 1482SS 854.16
46.00 35.8 146932 854.11
48.00 32.2 145564 BS4.OS
50.00 29.1 144179 853.99
S2.00 26.2 142788 853.94
54.00 23.6 141394 853.88
i 56.00 21.3 139990 853.82
58.00 19.2 138560 853.76
60.00 17.3 137055 8S3.69
62.00 15.6 135406 853.62
64.00 14.1 133S86 853.54
66.00 12.7 131618 BS3.46
68.00 11.5 129520 053.37
70.00 10.3 127311 853.27
72.00 9.3 125207 8S3.18
74.00 8.4 123409 853.10
76.00 7.6 121880 053.03
78.00 6.8 120564 852.97
80.00 6.2 119417 852.92
82.00 S.6 118410 852.87
84.00 5.0 117S17 852.83
86.00 4.5 116720 852.79
88.00 4.1 116003 852.76
90.00 3.7 115356 052.73
' 92.00 3.3 114767 852.70
94.00 3.0 114230 652.68
96.00 2.7 113738 852.66
98.00 2.4 113286 852.64
PEAK INFLOW - 88 .83 CFS
PEAK OUTFLOW = 59 .74 CFS
WEIR ORIFICE ORIFICE PRINCIPAL EMERGENCY TOTAL
RISOR BARREL RISOR SPILLWAY SPILLWAY OUTFLOW
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
0.0 0.0 0.0 0.0 0.0 0.0
2.7 27.0 15.1 2.7 0.0 2.7
14.7 28.2 26.S 14.7 0.0 14.7
29.1 29.1 33.3 29.1 0.0 29.1
44.3 30.0 38.3 30.0 0.0 30.0
59.9 30.7 42.3 30.7 3.4 34.1
73.2 31.3 45.3 31.3 13.4 44.7
82.0 31.7 47.0 31.7 21.8 53.4
86.6 31.8 47.9 31.8 26.4 58.3
87.9 31.9 48.1 31.9 27.8 S9.7
87.2 31.9 48.0 31.9 27.1 58.9
85.1 31.8 47.6 31.8 24.9 56.7
82.3 31.7 47.1 31.7 22.1 S3.7
79.1 31.6 46.4 31.6 18.9 50.4
75.6 31.4 45.8 31.4 15.6 47.0
72.1 31.3 45.0 31.3 12.S 43.8
68.5 31.1 44.3 31.1 9.5 40.7
65.1 31.0 43.S 31.0 6.9 37.8
61.6 30.8 42.7 30.8 4.5 35.3
58.2 30.7 41.9 30.7 2.4 33.1
54.7 30.5 41.1 30.5 0.8 31.3
51.1 30.3 40.2 30.3 0.0 30.3
47.3 30.1 39.1 30.1 0.0 30.1
43.2 29.9 30.0 29.9 0.0 29.9
38.8 29.7 36.6 29.7 0.0 29.7
34.3 29.4 35.2 29.4 0.0 29.4
29.7 29.2 33.S 29.2 0.0 29.2
2S.6 28.9 31.9 2S.6 0.0 25.6
22.1 28.7 30.4 22.1 0.0 22.1
19.3 20.S 29.1 19.3 0.0 19.3
17.0 28.3 27.8 17.0 0.0 17.0
15.1 28.2 26.7 15.1 0.0 15.1
13.4 28.1 25.7 13.4 0.0 13.4
12.0 27.9 24.8 12.0 0.0 12.0
10.8 27.8 23.9 10.8 0.0 10.8
9.7 27.7 23.1 9.7 0.0 9.7
8.0 27.6 22.4 8.8 0.0 8.B
8.0 27.6 21.6 8.0 0.0 8.0
7.3 27.5 21.0 7.3 0.0 7.3
6.6 27.4 20.3 6.6 0.0 6.6
6.0 27.4 19.7 6.0 0.0 6.0
PEAK ELEV 854.30 EMERGENCY SPILLWAY ACTIVATED
' PEAK STORAGE - ISiS9S CF

I E. ORIFICE HOLE
4 -DAY RELEASE
NUMBER OF BOLES 2
AVERAGE SURFACE AREA 19089 SF
DETENTION DEPTH 1.90 FT
a - 0.415/t.h.(h)".5
a . 4.55 SQ IN
d . 1.70 IN 1 11/16 in
8 -DAY RELEASE
NUMBER OF HOLES 2
AVERAGE SURFACE AREA 19089 SF
DETENTION DEPTH 1.90 FT
a - 0.415/t-A-(h)".5
a - 2.27 SQ IN
d - 1.20 IN 1 3/16 in
AVE d - 1.45 IN 1 7/16 in
FLOTATION OF RISOR
VOLUME OF RISOR
ASSUME INVERT ELEV - 847.0
ASSUME RISOR ELEV - 052.3
RISOR DIAMETER - 36 in
V - 3.14159-r"2•h
V 37.5 CF
VOLUME OF BARREL
ASSUME LENGTH . IS.00 ft
BARREL DIAMETER - 24 in
V - 3.14159-r"2•L
V . 47.1 CF
TOTAL VOLUME = 84.6 CF
CONCRETE REQ'D
DISPLACED PATER 5278 LB
VEIGHT OF CONCRETE (BOUYANT) - 87.60 LB/CF
CONCRETE REQ'D - 60.3 CF
RISOR AREA - 7.1 SF
CONCRETE REQ'D - 8.5 LF
ADD IS% SAFETY FACTOR - 9.8 LF
69.3 CF
t
t
t
SUMMARY
TOP OF DAM
100-YEAR HIGH WATER
10-YEAR HIGH WATER
EMERGENCY SPILLWAY ELEV
RISOR ELEV
ORIFICE ELEV
INVERT ELEV
SEDIMENT STORAGE REQUIRED
SEDIMENT STORAGE PROVIDED
SURFACE AREA REQUIRED
SURFACE AREA PROVIDED
RISOR DIAMETER
BARREL DIAMETER
ORIFICE PLATE DIAMETER
ORIFICE HOLE S/DIAMETER
WEIR LENGTH
2
855.7
BS4.3
BS3.6
853.7
852.30
850.40
847.0
7487 CF
21986 CF
14573 SF
16763 SF
36 in
24 in
22 in
1.70 in
21 ft