20080793 Ver 1_More Info Received_20080814

ll 4190 Hwy. 16 South • Newton, NC 28658 • [phone] • Fax [phone]
July 11, 2008
Sue Homewood
NCDENR
Wetlands Permitting
585 Waughtown Street
Winston-Salem, NC 27107
1113
Re: BREMCO
Sue,
Attached is the response to additional information requested for the BREMCO project located in Ashe
County. Below are the responses.
1. The stormwater plans are attached. A wet detention pond will be utilized to achieve the 85%
TSS removal rate.
2. Attached is a justification of avoidance and minimization.
3. Attached is a cross section and profile view of the proposed impact.
4. Temporary impacts are shown on sheet C11.0 on the dewatering detail.
5. Project will be built in the dry. A pump around will be used to bypass the construction area.
Should you need any further information, please do not hesitate to contact me.
Thank you,
X//- ? -I
Miles A. Wright,PE
WR
AUG 1 4 2008
DENR - WATER QUALITY
WETLANDS AND STORMWATER BRANCH
CIVIL ENGINEERS & SURVEYORS
4190 Hwy. 16 South • Newton, NC 28658 • [phone] • Fax [phone]
July 11, 2008
Justification of Avoidance & Minimization
There are several existing buildings on the site as witnessed by representatives of your office during the
site visit and also as shown on the attached sketch. These existing buildings pose a navigation problem
with the site due to the nature of the business that will occupy it.
The proposed use is a district office for Blue Ridge Electric Membership Corporation (BREMCO). The
business will utilize the back portion of the property for truck parking & pole storage. Blue Ridge needs
to be able to navigate the site from East to West to transport poles and other equipment. The existing
garage building poses a problem with the navigation due the close proximity to the creek at the North of
the Building and the narrowness of the driveway to the South. This drive to the South is not suitable for
Blue Ridge to navigate the tractor trailers and the line trucks in and out of the site pulling the long
power poles. This narrowness of the drive is a direct result of the length needed for the driveway off of
Highway 163 to accommodate at least 2 tractor trailers. It must accommodate at least 2 tractor trailers
due to the fact that there will be a security gate that will stop the flow of traffic off of Highway 73.
As discussed above the fact that there are existing buildings on the site limit BREMCO to layout of the
site to minimize impacts to the site. Also there are topo issues on the site that limit the placement of
buildings in the east and west location, so there is not play in the placement of the buildings on site.
Also BREMCO needs the maximum amount of storage at the rear of the site for power poles and other
equipment storage. This need for stocked items is critical to the operation of the Company. BREMCO
serves a majority of Ashe County with power and with this storage of equipment on site the reponse
times to power outages due to icing, storms, etc. is quicker than if the company had to import the
equipment needed.
In summary, due to the location of the existing building on site, topo constraints and the needs of the
owner to operate their business with proper navigation on site, BREMCO needs to pipe to pipe the 142
LF of creek.
Should you need any further information, please do not hesitate to contact me.
Thank you,
/Miles A. Wright, P
CIVIL ENGINEERS & SURVEYORS
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Storm Drainage & Erosion
Control Calculations
For
BREMCO
Ashe District Office
Prepared By
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WRIGHT & ASSOCIATES
ENGINEERS & SURVEYORS
4190 HIGHWAY 16 SOUTH
NEWTON, NC 28658
[phone] OFFICE
[phone] FAX
AUG Y 4
2008
DENR - WA EP QUAL! h
WETLANDS AND STORNWATER 8RANCtj
Detention Calculations
BREMCO
1/28/2008
Existing Conditions:
On-Site Drainage Area=
Off-Site Drainage Area=
Total Drainage Area=
Curve Number Data
On-Site:
Impervious On-Site:
Pervious On-Site:
8.52 Ac.
0 Ac.
8.52 Ac.
8.52 Acres (Total Area)
1.2 Acres Curve Number=
7.32 Acres Curve Number=
Existing On-site Conditions Composite Curve Number
Off-Site Drainage Area= 0 Ac. Curve Number
Existing Conditions Curve Number 69
Developed Conditions:
On-Site Drainage Area= 8.52 Ac.
Off-Site Drainage Area= 0 Ac.
Area Diverted Around System 0 Ac. -(Assume this area will have same
Total Drainage Area= 8.52 Ac. runoff in Post Dev. As in Pre. Dev.)
Curve Number Data
On-Site: 8.52 Acres (Total Area)
Impervious On-Site: 7.65 Acres Curve Number=
Pervious On-Site: 0.87 Acres Curve Number=
Developed On-site Conditions Composite Curve Number
Off-Site Drainage Area= 0 Ac. Curve Number
Developed Conditions Curve Number 92
95
65
69
69 (Meadow)
95
65
92
69 (Meadow)
Worksheet 3: Time of concentration (Tc) or travel tiTne (Tt)
Project cc By Dace
Location Checked Date
Circle one: Present Developed
Circle one: T_ T through subarea
NOT S: Space for as many as two segments per flow type can be used for each
worksheet.
Include a map, schematic, or description of flow segments.
Sheet flow (applicable to Tc only) Segment ID
I. Surface description (table 3-1) ............ Ihp
2. Hanning's roughness coeff., n (table 3-1) .. I?•O ?,
3. Flow length, L (total L < 300 fc) .......... ft Db
4. Taro-yr 24-hr rainfall, P2 in 3 • ?Z
5. Land slope, s .............................. fc/ft 0,01(P7
0.007 (nL)0 8
6 T` P 0.3 s0.4 Compute Tt ...... hr T
2
Shallow concentrated flow Segment ID
7. Surface description (paved or unpaved) .....
8. Flow length, L ............................. fc Lee
9. Watercourse slope, s ....................... fc/fc 0•D4
10. Average velocity, V (figure 3-1) ........... ft/s
L
11• Tt ' 3600 V Compute TC ...... hr + ?.?
Channel flow Segment ID
12. Cross sectional flow area, a ............... ft2 0.00
13. Wetted perimeter, p w ....................... fc .2-3<
14. Hydraulic radius, r a Compute r ....... fc p. 37
pw
15. Channel slope, s ........................... ft/ft 0•40S
16. Manning's roughness coeff. , n 0.0(3
17. v 1.49 r2/3 s 1/2.
Compute V ....... fc/s
18. Flow length, L ............................. fc (oM
19. T L
c 3600 V Compute Tt ,,,.,, hr +
- ?.GJ7
20. Watershed or subarea Tc or Tc (add TC in steps 6, 11, and 19) ....... hr . w
(210-VI-TR-55, Second Ed., June 1986) D-3

Table 3-11
Runoff Curve Numbers'
Cover Description Curve Numbers for
Hydrologic Soil Groups
Cover Type and Hydrologic Average Percent A B C D
Condition Impervious Areal
Fully Developed Urban Areas (vegetation established)
Open space (lawns, parks, cemeteries, etc.)'
Poor condition (grass cover <50%) 68 79 86 89
Fair condition (grass cover 50% to 75%) 49 69 79 84
Good condition (grass cover >75%) 39 61 74 80
Impervious areas:
Paved parking lots, roofs, driveways, etc.
98
98
98
98
Paved streets and roads 98 98 98 98
Paved; open ditches (including right-of-way) 83 89 92 93
Gravel (including right-of-way) 76 85 89 91
Dirt (including right-of-way) 72 82 87 89
Urban districts:
Commercial and business
85
89
92
94
95
Industrial 72 81 88 91 93
Residential district by average lot size:
1 /8 acre or less (town houses) 65 77 85 90 92
1 /4 acre 38 61 75 83 87
1 /3 acre 30 57 72 81 86
1 /2 acre 25 54 70 80 85
1 acre 20 51 68 79 84
2 acres 12 46 65 77 82
Agricultural Lands
Pasture, grassland, or range (continuous forage for grazing)'
Poor hydrologic condition 68 79 86 89
Fair hydrologic condition 49 69 79 84
Good hydrologic condition 39 61 74 80
Meadow (continuous grass, protected from grazing and generally 30 58 71 78
mowed for hay)
Woods6
Poor hydrologic condition 45 66 77 83
Fair hydrologic condition 36 60 73 79
Good hydrologic condition 30 55 70. 77
Developing Urban Areas
Newly graded areas (pervious areas
only, no vegetation) 77 86 91 94
3-30
Table 3-12
Roughness Coefficients (Manning's n)' for Sheet Flow
Surface Descrivtion 2
Smooth surfaces (concrete, asphalt
gravel, or bare soil) 0.01 1
Fallow (no residue) 0.05
Cultivated soils:
Residue cover < 20% . 0.06
Residue cover > 20% 0.17
Grass:
Short grass prairie 0.15
Dense grasses' 0.24
Bermuda grass 0.41
Range (natural) 0.13
Woods'
Light underbrush 0.40
Dense underbrush 0.80
'The n values are a composite of information by Engman (1986).
'Includes species such as weeping lovegrass, bluegrass, buffalo grass, blue
gamma grass, and native grass mixture.
'When selecting n, consider cover to a height of abo ut 0.1 ft. This is the only part
of the plant cover that will obstruct sheet flow.
Source: SCS, TR-55, Second Edition, June 1986.
3-33
.50 -
.20 -
-W .10 -
4-
06
0
4A -
.04 -
0
v
L
4
.02
.01
I b I
Q,
J?4 amt
.005
1 2 4 6 10
Average velocity, ft/sec
Source: USDA, SCS, TR55(19W
Figure 3-5
Average Velocities- Shallow Concentrated Flow
3-35
1
20.

3.10 Simplified SCS Method
Overview The following SCS procedures were taken from the SCS Technical Release 55
3.10.1 (TR-55) which presents simplified procedures to calculate storm runoff volum
es, peak rate of discharges and hydrographs. These procedures are applicable to
small drainage areas and include provisions to account for urbanization. The
following procedures outline the use of the SCS-TR 55 method.
Peak The SCS peak discharge method is applicable for estimating the peak runoff rate
Discharges from watersheds with homogeneous land uses. The following method is based
3.10.2 on the results of computer analyses performed using TR-20, "Computer Program
for Project Formulation- Hydrology" (SCS 1983).
The peak discharge equation is:
C, = q AOFo (3.26)
Where: Q. = peak discharge (cfs)
q? = unit peak discharge (cfs/miZfin)
A = drainage area (mil)
Q = runoff (in)
Fp = pond and.swamp adjustment factor
The input requirements, for this, method are as follows:
1. T, - hours
2. Drainage area - mil
3. Type II rainfall distribution
4. 24-hour design rainfall
5. CN value
6. Pond and Swamp adjustment factor
(If pond and swamp areas are spread throughout the watershed and are not
considered in the T, computation, an adjustment is needed.)
Computations Computations for the peak discharge method proceed as follows:
3.10.3
1. The 24-hour rainfall depth is determined from the following table for the
selected return frequency.
Freauencv 24-Hour Rainfall
2-year 3.12 inches
5-year 4.32 inches
10-year 4.80 inches
25-year 5.76 inches
50-year 6.48 inches
100-year 6.96 inches
3-44
Table 4-2 (continued)
J Type of channel and description M inimum Normal Maximum
C. EXCAVATED OR DREDGED
straight and uniform
Earth
a
,
.
recently completed
Clean
1 0.016 0.018 0.020
,
.
after weathering
Clean
2 0.018 0.022 0.025
,
.
uniform section, clean
Gravel
3 0.022 0.025 0.030
,
.
4. With short grass, few weeds 0.022 0.027 0.033
winding and sluggish
Earth
b
,
.
1. No vegetation 0.023 0.025 0.030
Gran, some weeds
2 0 025 0-030 0 033
.
3. Dense weeds or aquatic plants in 0.030 0.035 0.040
deep channels
Earth bottom and rubble sides
4 0.028 0.030 0.035
.
5. Stony bottom and weedy banks 0.025 0.035 0.040
6. Cobble bottom and clean sides 0.030 0.040 0 050
c. Dragline-excavated or dredged
1. No vegetation 0.025 0.028 0.033
2. Light brush on banks 0.035 0.050 0.060
d. Rock cuts
Smooth acid uniform
1
0.025
0.035
0.040
.
2. Jagged and irregular 0.035 0.040 0.050
e. Channels not maintained, weeds and
brush uncut
Dense weeds, high as flow depth
1
0.050
0.080
0.120
.
Clem bottom, brush on sides
2 0.040 0.050 0.080
.
3. Same, highest stage of flow 0.045 0.070 0.110
4. Dense brush, high stsge 0.080 0.100 0,140
D. NATURAL STREAMS
D-1. Minor streams (top width at flood stage
<100 ft)
a. Streams on plain
1. Clean, straight, full stage, no rifts or 0.025 0.030 0.033
deep pools
2. Same as above, but more stones and
0.030
0.035
0.040
weeds
3. Clean, winding, some pools and
0.033
0.040
O045
Shoals
4. Same as above, but some weeds and
0.035
0.045
0 050
stones 5. Same u above, lower stages, more 0.040 0.048 0.055
ineffective slopes and sections
6. Same as 4, but more atones 0.045 0.050 0.060
7. Sluggish reaches, weedy, deep pools 0.050 0.070 f. 080
8. Very weedy reaches, deep pools, or 0.075 0.100. 0.150
doodways with heavy stand of tim-
ber and underbrush
4-12
Storm Drainage
10 Year Flow Calculatio ns j

Structure Number ! Drainage Area I C I(in/hr) Q(10) Total Q(10)
GI# 17 0.15 0.70 6.50 0.68 0.68
GI# 18 0.21 0.70 6.50 0.96 1.64
I
YI#16 1.57 0.70 ! 6.50 7.14 7.14
GI#15 0.69 0.70 6.50 3.14 10.28
G1414 0.51 0.70 ! 6.50 2.32 12.60
G14 13 1.14 0.70 6.50 5.19 17.79
G1412 ! 0.88 0.70 6.50 4.00 21.79
CB#7 0.42 I 0.70 ! 6.50 ! 1.91 23.71
CB98 0.07 0.70 6.50 0.32 24.02
CB99 0.08 0.70 6.50 0.36 25.07
CB#6 0.15 0.70 6.50 1 0.68 0.68
CB# 10 0.17 0.70 6.50 0.77 25.84
CB#11 0.21 0.70 6.50 0.96 26.80
CB#4 0.45 0.70 j 6.50 2.05 41.09
CB#5 0.15 0.70 6.50 0.68 41.77
j
CB# 1 0.18 0.70 6.50 0.82 0.82
GI# 1 A 1.52 0.70 6.50 6.92 7.74
G142 0.67 0.70 6.50 3.05 12.24
G1419 0.32 0.70 ! 6.50 1.46 1! 1.46
1" Volume Calculation
Vh= (1.00) [0.05 + 0.009 (1)] * A * 1/12
1 = % of Watershed Impervious= 89.7
A = Watershed in Acres= 8.52
Vh= 0.608 AC-FT = 26503.63 Cubic Feet
Depth of 1" Storage (See Storage Volume Calculations)
Stage Volume
969 23936 Bottom Elev of Pond= 967
970 37858
Interpolate between 969 & 970
1" Elev= 969.18
Orifice Size Calculation
t= (2A/(C*a*2*g^0.5)) * h111.5 - h21.5
A= Pond Surface Area (SF)= 10716 SF (Avg)
C= Coefficient of Discharge = 0.6
a= area of orifice (SF)= 0.0167 SF (1.5" Orifice)
g=acceleration due to gravity 32.2 Feet/Sec^2
h1= 2.18 Feet
h2= 0 Feet
t= 77.44 Hours (Time to dewater Basin)
Proposed Conditions Storage Volumes

Contour Surface Area Change in Elevation Sub Volume Total Volume
967 10716 0.0 0.0 0.0
968 11954 1.0 11335 11335
969 13247 1.0 12601 23936
970 14597 1.0 13922 37858
971 16004 1.0 15301 53158

Proposed Pond Outflow

Elev Spillway Emergency Total Flow
967 0.00 0.00 0.00
968 0.08 I 0.00 0.08
969 Oil 0.00 011
#units=Elevation,ft,volume,ft3
#Stage-Storage Curve Data
#Stage - ft volume - ft3
#------------------------------
967,0
968,11335
969,23936
970,37858
971,53158
StageStorage.ssc
Page 1
#units=Elevation,ft,Flowrate,cfs
#Stage-Discharge Curve Data
#stage - ft Discharge - cfs
#-------- --------
967,0
968,0.08
969,1,0.09
969.2,0.12
970,21.77
971,73.18
stagedischarge.sdc
Page 1
tmp#6.txt
storage Indication Method
Given Input Data:
File ......
Description ....
Time increment . 0.1000 hrs
input Files:
Pre-Dev Hydrograph curve .. G:\Land Projects 3\101-027\hd\2-year storm (pre).hdc
Post-Dev Hydrograph curve G:\Land Projects 3\101-027\hd\2-year storm.hdc
Stage-Storage curve ....... G:\Land Projects 3\101-027\hd\stagestorage.ssc
stage-Discharge curve ..... G:\Land Projects 3\101-027\hd\stagedischarge.sdc
Output Data:
Routed Peak Flow ......... 10.0858 cfs
Routed Peak Time ......... 12.3000 hrs
Pre-Developed Peak Flow .. 9.1583 cfs
Pre-Developed Peak Time .. 12.1000 hrs
Post-Developed Peak Flow 30.5846 cfs
Post-Developed Peak Time 12.1000 hrs
Support calculations:
----------
Time ----------
inflow -----------
(11+12)/2 ---------
H1 --------------------------------
S1-(01/2)T S2+(02/2)T H2 ----------
Outflow
hrs cfs ft3 ft ft3 ft3 ft cfs
----------
11.0000 ----------
0.7268 -----------
130.8175 ---------
0.0000 -----------
0.0000 -----------
130.8175 ----------
967.0115 ----------
0.0009
11.1000 0.8277 279.8040 967.0115 130.4855 410.2895 967.0362 0.0029
11.2000 0.9286 316.1422 967.0362 409.2484 725.3906 967.0639 0.0051
11.3000 1.0296 352.4804 967.0639 723.5498 1076.0302 967.0948 0.0076
11.4000 1.2214 405.1707 967.0948 1073.2997 1478.4704 967.1303 0.0104
11.5000 1.4132 474.2133 967.1303 1474.7187 1948.9320 967.1717 0.0137
11.6000 1.6049 543.2558 967.1717 1943.9864 2487.2423 967.2192 0.0175
11.7000 4.4413 1088.3286 967.2192 2480.9307 3569.2593 967.3145 0.0252
11.8000 7.2777 2109.4315 967.3145 3560.2020 5669.6335 967.4996 0.0400
11.9000 10.1141 3130.5345 967.4996 5655.2464 8785.7809 967.7741 0.0619
12.0000 19.5923 5347.1637 967.7741 8763.4863 14110.6499 968.2163 0.2790
12.1000 30.5846 9031.8554 968.2163 14010.2157 23042.0711 968.9159 0.9226
12.2000 19.0170 8928.2916 968.9159 22709.9317 31638.2234 969.4605 7.1706
12.3000 6.5712 4605.8647 969.4605 29056.8005 33662.6653 969.5683 10.0858
12.4000 4.4514 1984.0648 969.5683 30031.7632 32015.8280 969.4806 7.7144
12.5000 3.7247 1471.6964 969.4806 29238.6534 30710.3498 969.4112 5.8345
12.6000 3.1493 1237.3151 969.4112 28609.9405 29847.2557 969.3652 4.5916
12.7000 2.6042 1035.6382 969.3652 28194.2780 29229.9163 969.3324 3.7026
12.8000 2.3014 883.0179 969.3324 27896.9700 28779.9878 969.3084 3.0547
12.9000 2.1500 801.2569 969.3084 27680.2864 28481.5433 969.2926 2.6250
13.0000 1.9986 746.7497 969.2926 27536.5567 28283.3064 969.2820 2.3395
13.1000 1.8623 694.9678 969.2820 27441.0867 28136.0544 969.2742 2.1275
13.2000 1.7261 645.9112 969.2742 27370.1707 28016.0819 969.2678 1.9547
13.3000 1.6352 605.0308 969.2678 27312.3925 27917.4232 969.2625 1.8126
13.4000 1.5444 572.3264 969.2625 27264.8789 27837.2053 969.2583 1.6971
13.5000 1.4687 542.3474 969.2583 27226.2462 27768.5936 969.2546 1.5983
13.6000 1.3930 515.0937 969.2546 27193.2032 27708.2969 969.2514 1.5115
13.7000 1.3324 490.5655 969.2514 27164.1645 27654.7300 969.2486 1.4343
13.8000 1.2718 468.7626 969.2486 27138.3669 27607.1295 969.2460 1.3658
13.9000 1.2113 446.9597 969.2460 27115.4427 27562.4024 969.2437 1.3014
14.0000 1.1507 425.1567 969.2437 27093.9023 27519.0591 969.2413 1.2390
14.1000 1.1103 406.9877 969.2413 27073.0284 27480.0160 969.2393 1.1828
14.2000 1.0700 392.4524 969.2393 27054.2254 27446.6778 969.2375 1.1347
14.3000 1.0296 377.9171 969.2375 27038.1699 27416.0870 969.2359 1.0907
Page 1
tmp#6.txt
14.4000 1.0094 367.0157 969.2359 27023.4374 27390.4531 969.2345 1.0538
14.5000 0.9892 359.7450 969.2345 27011.0923 27370.8403 969.2335 1.0255
14.6000 0.9690 352.4804 969.2335 27001.6468 27354.1272 969.2326 1.0015
14.7000 0.9463 344.7585 969.2326 26993.5979 27338.3564 969.2317 0.9788
14.8000 0.9236 336.5824 969.2317 26986.0027 27322.5852 969.2309 0.9560
14.9000 0.9009 328.4063 969.2309 26978.4074 27306.8137 969.2301 0.9333
15.0000 0.8782 320.2302 969.2301 26970.8119 27291.0421 969.2292 0.9106
15.1000 0.8600 312.8718 969.2292 26963.2164 27276.0881 969.2284 0.8891
15.2000 0.8418 306.3309 969.2284 26956.0146 27262.3455 969.2277 0.8693
15.3000 0.8237 299.7900 969.2277 26949.3962 27249.1862 969.2270 0.8504
15.4000 0.8055 293.2491 969.2270 26943.0587 27236.3079 969.2263 0.8318
15.5000 0.7873 286.7083 969.2263 26936.8566 27223.5649 969.2256 0.8135
15.6000 0.7692 280.1674 969.2256 26930.7196 27210.8870 969.2249 0.7952
15.7000 0.7510 273.6265 969.2249 26924.6140 27198.2405 969.2243 0.7770
15.8000 0.7328 267.0856 969.2243 26918.5235 27185.6092 969.2236 0.7588
15.9000 0.7147 260.5448 969.2236 26912.4403 27172.9851 969.2229 0.7406
16.0000 0.6965 254.0039 969.2229 26906.3606 27160.3645 969.2223 0.7224
16.1000 0.6844 248.5532 969.2223 26900.2826 27148.8358 969.2216 0.7058
16.2000 0.6723 244.1926 969.2216 26894.7304 27138.9230 969.2211 0.6916
16.3000 0.6601 239.8320 969.2211 26889.9564 27129.7884 969.2206 0.6784
16.4000 0.6480 235.4714 969.2206 26885.5573 27121.0287 969.2202 0.6658
16.5000 0.6359 231.1108 969.2202 26881.3386 27112.4495 969.2197 0.6535
16.6000 0.6299 227.8404 969.2197 26877.2069 27105.0473 969.2193 0.6428
16.7000 0.6238 225.6601 969.2193 26873.6421 27099.3022 969.2190 0.6345
16.8000 0.6177 223.4798 969.2190 26870.8752 27094.3551 969.2187 0.6274
16.9000 0.6117 221.2995 969.2187 26868.4927 27089.7922 969.2185 0.6208
17.0000 0.6056 219.1192 969.2185 26866.2953 27085.4145 969.2183 0.6145
17.1000 0.5996 216.9390 969.2183 26864.1870 27081.1259 969.2180 0.6083
17.2000 0.5935 214.7587 969.2180 26862.1216 27076.8803 969.2178 0.6022
17.3000 0.5875 212.5784 969.2178 26860.0769 27072.6553 969.2176 0.5961
17.4000 0.5814 210.3981 969.2176 26858.0422 27068.4403 969.2174 0.5901
17.5000 0.5754 208.2178 969.2174 26856.0123 27064.2301 969.2171 0.5840
17.6000 0.5693 206.0375 969.2171 26853.9846 27060.0221 969.2169 0.5780
17.7000 0.5632 203.8572 969.2169 26851.9581 27055.8153 969.2167 0.5719
17.8000 0.5572 201.6769 969.2167 26849.9321 27051.6091 969.2165 0.5658
17.9000 0.5511 199.4966 969.2165 26847.9064 27047.4030 969.2163 0.5598
18.0000 0.5451 197.3163 969.2163 26845.8808 27043.1972 969.2160 0.5537
18.1000 0.5360 194.5910 969.2160 26843.8553 27038.4463 969.2158 0.5469
18.2000 0.5269 191.3205 969.2158 26841.5673 27032.8878 969.2155 0.5389
18.3000 0.5178 188.0501 969.2155 26838.8903 27026.9404 969.2152 0.5303
18.4000 0.5087 184.7797 969.2152 26836.0261 27020.8058 969.2148 0.5215
18.5000 0.4997 181.5092 969.2148 26833.0717 27014.5809 969.2145 0.5125
18.6000 0.4906 178.2388 969.2145 26830.0738 27008.3126 969.2142 0.5035
18.7000 0.4815 174.9684 969.2142 26827.0550 27002.0234 969.2138 0.4944
18.8000 0.4724 171.6979 969.2138 26824.0262 26995.7241 969.2135 0.4854
18.9000 0.4633 168.4275 969.2135 26820.9924 26989.4199 969.2132 0.4763
19.0000 0.4542 165.1570 969.2132 26817.9564 26983.1134 969.2128 0.4672
19.1000 0.4482 162.4317 969.2128 26814.9192 26977.3509 969.2125 0.4589
19.2000 0.4421 160.2514 969.2125 26812.1440 26972.3954 969.2123 0.4518
19.3000 0.4361 158.0711 969.2123 26809.7574 26967.8285 969.2120 0.4452
19.4000 0.4300 155.8908 969.2120 26807.5581 26963.4489 969.2118 0.4389
19.5000 0.4239 153.7105 969.2118 26805.4488 26959.1594 969.2116 0.4327
19.6000 0.4179 151.5302 969.2116 26803.3830 26954.9133 969.2113 0.4266
19.7000 0.4118 149.3499 969.2113 26801.3381 26950.6881 969.2111 0.4205
19.8000 0.4058 147.1696 969.2111 26799.3033 26946.4729 969.2109 0.4144
19.9000 0.3997 144.9894 969.2109 26797.2733 26942.2627 969.2107 0.4084
20.0000 0.3937 142.8091 969.2107 26795.2456 26938.0547 969.2104 0.4023
20.1000 0.3921 141.4464 969.2104 26793.2191 26934.6655 969.2103 0.3974
20.2000 0.3906 140.9013 969.2103 26791.5869 26932.4882 969.2101 0.3943
20.3000 0.3891 140.3562 969.2101 26790.5383 26930.8945 969.2101 0.3920
20.4000 0.3876 139.8112 969.2101 26789.7708 26929.5820 969.2100 0.3901
20.5000 0.3861 139.2661 969.2100 26789.1387 26928.4048 969.2099 0.3884
20.6000 0.3846 138.7210 969.2099 26788.5718 26927.2928 969.2099 0.3868
Page 2
tmp#6.txt
20.7000 0.3831 138.1759 969.2099 26788.0362 26926.2122 969.2098 0.3853
20.8000 0.3816 137.6309 969.2098 26787.5158 26925.1467 969.2097 0.3837
20.9000 0.3800 137.0858 969.2097 26787.0027 26924.0885 969.2097 0.3822
21.0000 0.3785 136.5407 969.2097 26786.4930 26923.0338 969.2096 0.3807
21.1000 0.3770 135.9957 969.2096 26785.9851 26921.9807 969.2096 0.3792
21.2000 0.3755 135.4506 969.2096 26785.4780 26920.9285 969.2095 0.3777
21.3000 0.3740 134.9055 969.2095 26784.9712 26919.8767 969.2095 0.3761
21.4000 0.3725 134.3604 969.2095 26784.4647 26918.8251 969.2094 0.3746
21.5000 0.3710 133.8154 969.2094 26783.9582 26917.7736 969.2094 0.3731
21.6000 0.3694 133.2703 969.2094 26783.4518 26916.7221 969.2093 0.3716
21.7000 0.3679 132.7252 969.2093 26782.9454 26915.6706 969.2092 0.3701
21.8000 0.3664 132.1801 969.2092 26782.4391 26914.6192 969.2092 0.3686
21.9000 0.3649 131.6351 969.2092 26781.9327 26913.5677 969.2091 0.3671
22.0000 0.3634 131.0900 969.2091 26781.4263 26912.5163 969.2091 0.3655
22.1000 0.3543 129.1822 969.2091 26780.9199 26910.1022 969.2089 0.3621
22.2000 0.3452 125.9118 969.2089 26779.7573 26905.6691 969.2087 0.3557
22.3000 0.3361 122.6414 969.2087 26777.6223 26900.2637 969.2084 0.3479
22.4000 0.3270 119.3709 969.2084 26775.0191 26894.3901 969.2081 0.3394
22.5000 0.3180 116.1005 969.2081 26772.1904 26888.2909 969.2078 0.3307
22.6000 0.3089 112.8301 969.2078 26769.2531 26882.0831 969.2075 0.3217
22.7000 0.2998 109.5596 969.2075 26766.2635 26875.8231 969.2071 0.3127
22.8000 0.2907 106.2892 969.2071 26763.2486 26869.5378 969.2068 0.3037
22.9000 0.2816 103.0187 969.2068 26760.2217 26863.2404 969.2065 0.2946
23.0000 0.2725 99.7483 969.2065 26757.1889 26856.9372 969.2061 0.2855
23.1000 0.2635 96.4779 969.2061 26754.1533 26850.6311 969.2058 0.2764
23.2000 0.2544 93.2074 969.2058 26751.1163 26844.3237 969.2054 0.2673
23.3000 0.2453 89.9370 969.2054 26748.0787 26838.0157 969.2051 0.2583
23.4000 0.2362 86.6666 969.2051 26745.0407 26831.7073 969.2048 0.2492
23.5000 0.2271 83.3961 969.2048 26742.0027 26825.3988 969.2044 0.2401
23.6000 0.2180 80.1257 969.2044 26738.9645 26819.0902 969.2041 0.2310
23.7000 0.2089 76.8553 969.2041 26735.9263 26812.7816 969.2038 0.2219
23.8000 0.1999 73.5848 969.2038 26732.8881 26806.4729 969.2034 0.2128
23.9000 0.1908 70.3144 969.2034 26729.8499 26800.1643 969.2031 0.2038
24.0000 0.1817 67.0439 969.2031 26726.8117 26793.8556 969.2028 0.1947
24.1000 0.1726 63.7735 969.2028 26723.7734 26787.5470 969.2024 0.1856
24.2000 0.1635 60.5031 969.2024 26720.7352 26781.2383 969.2021 0.1765
24.3000 0.1544 57.2326 969.2021 26717.6970 26774.9296 969.2018 0.1674
24.4000 0.1454 53.9622 969.2018 26714.6588 26768.6210 969.2014 0.1583
24.5000 0.1363 50.6918 969.2014 26711.6205 26762.3123 969.2011 0.1492
24.6000 0.1272 47.4213 969.2011 26708.5823 26756.0037 969.2007 0.1402
24.7000 0.1181 44.1509 969.2007 26705.5441 26749.6950 969.2004 0.1311
24.8000 0.1090 40.8805 969.2004 26702.5059 26743.3863 969.2001 0.1220
24.9000 0.0999 37.6100 969.2001 26699.4677 26737.0777 969.1996 0.1216
25.0000 0.0908 34.3396 969.1996 26693.2838 26727.6234 969.1989 0.1248
25.1000 0.0818 31.0691 969.1989 26682.6890 26713.7582 969.1978 0.1295
25.2000 0.0727 27.7987 969.1978 26667.1511 26694.9498 969.1964 0.1358
25.3000 0.0636 24.5283 969.1964 26646.0737 26670.6020 969.1946 0.1439
25.4000 0.0545 21.2578 969.1946 26618.7885 26640.0464 969.1922 0.1542
25.5000 0.0454 17.9874 969.1922 26584.5467 26602.5341 969.1894 0.1667
25.6000 0.0363 14.7170 969.1894 26542.5090 26557.2259 969.1859 0.1819
25.7000 0.0273 11.4465 969.1859 26491.7348 26503.1814 969.1818 0.2000
25.8000 0.0182 8.1761 969.1818 26431.1703 26439.3464 969.1769 0.2214
25.9000 0.0091 4.9057 969.1769 26359.6344 26364.5400 969.1713 0.2465
26.0000 0.0000 1.6352 969.1713 26275.8033 26277.4386 969.1646 0.2757
Page 3
tmp#7.txt
storage indication method
Given Input Data:
File ......
Description ....
Time increment . 0.1000 hrs
Input Files:
Pre-Dev Hydrograph curve ..
G:\Land
Projects
3\101-027\hd\10-year storm (pre).hdc
Post-Dev Hydrograph curve G:\Land Projects 3\101-027\hd\10-year storm.hdc
Stage-Storage curve ....... G:\Land Projects 3\101-027\hd\stagestorage.ssc
Stage-Discharge curve ..... G:\Land Projects 3\101-027\hd\stagedischarge.sdc
output Data:
Routed Peak Flow ......... 34.7380 cfs
Routed Peak Time ......... 12.2000 hrs
Pre-Developed Peak Flow .. 24.3811 cfs
Pre-Developed Peak Time .. 12.1000 hrs
Post-Developed Peak Flow 52.3588 cfs
Post-Developed Peak Time 12.1000 hrs
support calculations:
----------
Time ----------
inflow -----------
(I1+12)/2 ---------
H1 --------------------------------
Sl-(01/2)T S2+(02/2)T H2 ----------
outflow
hrs cfs ft3 ft ft3 ft3 ft cfs
----------
11.0000 ----------
1.2442 -----------
223.9503 ---------
0.0000 -----------
0.0000 -----------
223.9503 ----------
967.0197 ----------
0.0016
11.1000 1.4170 479.0049 967.0197 223.3820 702.3869 967.0619 0.0050
11.2000 1.5898 541.2133 967.0619 700.6046 1241.8179 967.1094 0.0088
11.3000 1.7626 603.4217 967.1094 1238.6667 1842.0884 967.1623 0.0130
11.4000 2.0909 693.6239 967.1623 1837.4139 2531.0379 967.2230 0.0178
11.5000 2.4192 811.8200 967.2230 2524.6152 3336.4351 967.2940 0.0235
11.6000 2.7475 930.0160 967.2940 3327.9687 4257.9846 967.3752 0.0300
11.7000 7.6033 1863.1424 967.3752 4247.1797 6110.3220 967.5384 0.0431
11.8000 12.4590 3611.1991 967.5384 6094.8166 9706.0157 967.8552 0.0684
11.9000 17.3147 5359.2559 967.8552 9681.3859 15040.6418 968.2891 0.3460
12.0000 33.5407 9153.9699 968.2891 14916.0811 24070.0510 968.9964 0.9967
12.1000 52.3588 15461.9043 968.9964 23711.2430 39173.1473 969.8615 18.0210
12.2000 32.5557 15284.6103 969.8615 32685.5881 47970.1984 970.2522 34.7380
12.3000 11.2494 7884.9180 970.2522 35464.5299 43349.4479 970.0641 25.0632
12.4000 7.6205 3396.5801 970.0641 34326.7027 37723.2828 969.7843 15.9332
12.5000 6.3764 2519.4413 969.7843 31987.3395 34506.7807 969.6132 11.3014
12.6000 5.3914 2118.1969 969.6132 30438.2857 32556.4826 969.5094 8.4929
12.7000 4.4583 1772.9401 969.5094 29499.0303 31271.9705 969.4410 6.6432
12.8000 3.9399 1511.6648 969.4410 28880.4147 30392.0794 969.3942 5.3762
12.9000 3.6807 1371.6958 969.3942 28456.6629 29828.3587 969.3642 4.5644
13.0000 3.4215 1278.3832 969.3642 28185.1773 29463.5605 969.3448 4.0391
13.1000 3.1882 1189.7361 969.3448 28009.4921 29199.2282 969.3308 3.6584
13.2000 2.9549 1105.7548 969.3308 27882.1907 28987.9455 969.3195 3.3542
13.3000 2.7994 1035.7703 969.3195 27780.4379 28816.2082 969.3104 3.1069
13.4000 2.6439 979.7827 969.3104 27697.7299 28677.5126 969.3030 2.9072
13.5000 2.5143 928.4608 969.3030 27630.9347 28559.3955 969.2967 2.7371
13.6000 2.3847 881.8044 969.2967 27574.0500 28455.8544 969.2912 2.5880
13.7000 2.2810 839.8138 969.2912 27524.1851 28363.9988 969.2863 2.4557
13.8000 2.1773 802.4887 969.2863 27479.9478 28282.4365 969.2820 2.3382
13.9000 2.0736 765.1636 969.2820 27440.6677 28205.8314 969.2779 2.2279
14.0000 1.9699 727.8386 969.2779 27403.7750 28131.6136 969.2739 2.1211
14.1000 1.9008 696.7344 969.2739 27368.0321 28064.7664 969.2704 2.0248
14.2000 1.8317 671.8510 969.2704 27335.8387 28007.6897 969.2673 1.9426
14.3000 1.7626 646.9676 969.2673 27308.3508 27955.3185 969.2646 1.8672
Page 1
tmp#7.txt
14.4000 1.7280 628.3051 969.2646 27283.1291 27911.4342 969.2622 1.8040
14.5000 1.6935 615.8634 969.2622 27261.9946 27877.8580 969.2604 1.7556
14.6000 1.6589 603.4217 969.2604 27245.8244 27849.2462 969.2589 1.7144
14.7000 1.6200 590.2024 969.2589 27232.0451 27822.2475 969.2575 1.6756
14.8000 1.5811 576.2055 969.2575 27219.0427 27795.2482 969.2560 1.6367
14.9000 1.5423 562.2086 969.2560 27206.0399 27768.2485 969.2546 1.5978
15.0000 1.5034 548.2118 969.2546 27193.0370 27741.2487 969.2532 1.5589
15.1000 1.4723 535.6145 969.2532 27180.0340 27715.6485 969.2518 1.5221
15.2000 1.4412 524.4170 969.2518 27167.7050 27692.1221 969.2506 1.4882
15.3000 1.4101 513.2195 969.2506 27156.3748 27669.5943 969.2494 1.4557
15.4000 1.3790 502.0220 969.2494 27145.5255 27647.5475 969.2482 1.4240
15.5000 1.3478 490.8245 969.2482 27134.9079 27625.7323 969.2470 1.3926
15.6000 1.3167 479.6270 969.2470 27124.4018 27604.0287 969.2459 1.3613
15.7000 1.2856 468.4294 969.2459 27113.9494 27582.3789 969.2447 1.3302
15.8000 1.2545 457.2319 969.2447 27103.5229 27560.7548 969.2436 1.2990
15.9000 1.2234 446.0344 969.2436 27093.1089 27539.1433 969.2424 1.2679
16.0000 1.1923 434.8369 969.2424 27082.7009 27517.5377 969.2413 1.2368
16.1000 1.1716 425.5056 969.2413 27072.2957 27497.8013 969.2402 1.2084
16.2000 1.1509 418.0406 969.2402 27062.7907 27480.8314 969.2393 1.1839
16.3000 1.1301 410.5756 969.2393 27054.6181 27465.1937 969.2385 1.1614
16.4000 1.1094 403.1106 969.2385 27047.0870 27450.1976 969.2377 1.1398
16.5000 1.0886 395.6456 969.2377 27039.8650 27435.5106 969.2369 1.1187
16.6000 1.0783 390.0468 969.2369 27032.7918 27422.8386 969.2362 1.1004
16.7000 1.0679 386.3143 969.2362 27026.6890 27413.0033 969.2357 1.0863
16.8000 1.0575 382.5818 969.2357 27021.9524 27404.5342 969.2353 1.0741
16.9000 1.0472 378.8493 969.2353 27017.8737 27396.7230 969.2348 1.0628
17.0000 1.0368 375.1168 969.2348 27014.1118 27389.2286 969.2344 1.0520
17.1000 1.0264 371.3843 969.2344 27010.5026 27381.8869 969.2340 1.0414
17.2000 1.0161 367.6518 969.2340 27006.9668 27374.6186 969.2337 1.0310
17.3000 1.0057 363.9193 969.2337 27003.4665 27367.3858 969.2333 1.0206
17.4000 0.9953 360.1868 969.2333 26999.9831 27360.1699 969.2329 1.0102
17.5000 0.9850 356.4543 969.2329 26996.5080 27352.9623 969.2325 0.9998
17.6000 0.9746 352.7218 969.2325 26993.0369 27345.7586 969.2321 0.9894
17.7000 0.9642 348.9893 969.2321 26989.5676 27338.5569 969.2317 0.9790
17.8000 0.9539 345.2568 969.2317 26986.0993 27331.3560 969.2314 0.9687
17.9000 0.9435 341.5243 969.2314 26982.6314 27324.1556 969.2310 0.9583
18.0000 0.9331 337.7918 969.2310 26979.1637 27316.9555 969.2306 0.9479
18.1000 0.9176 333.1261 969.2306 26975.6961 27308.8222 969.2302 0.9362
18.2000 0.9020 327.5274 969.2302 26971.7792 27299.3066 969.2297 0.9225
18.3000 0.8865 321.9286 969.2297 26967.1965 27289.1251 969.2291 0.9079
18.4000 0.8709 316.3298 969.2291 26962.2931 27278.6230 969.2286 0.8927
18.5000 0.8554 310.7311 969.2286 26957.2354 27267.9665 969.2280 0.8774
18.6000 0.8398 305.1323 969.2280 26952.1032 27257.2356 969.2274 0.8619
18.7000 0.8243 299.5336 969.2274 26946.9353 27246.4688 969.2268 0.8464
18.8000 0.8087 293.9348 969.2268 26941.7501 27235.6849 969.2263 0.8309
18.9000 0.7932 288.3361 969.2263 26936.5566 27224.8926 969.2257 0.8154
19.0000 0.7776 282.7373 969.2257 26931.3590 27214.0963 969.2251 0.7998
19.1000 0.7672 278.0717 969.2251 26926.1596 27204.2313 969.2246 0.7856
19.2000 0.7569 274.3392 969.2246 26921.4086 27195.7478 969.2241 0.7734
19.3000 0.7465 270.6067 969.2241 26917.3230 27187.9297 969.2237 0.7621
19.4000 0.7361 266.8741 969.2237 26913.5579 27180.4320 969.2233 0.7513
19.5000 0.7258 263.1416 969.2233 26909.9470 27173.0886 969.2229 0.7408
19.6000 0.7154 259.4091 969.2229 26906.4105 27165.8196 969.2226 0.7303
19.7000 0.7050 255.6766 969.2226 26902.9097 27158.5864 969.2222 0.7199
19.8000 0.6947 251.9441 969.2222 26899.4262 27151.3704 969.2218 0.7095
19.9000 0.6843 248.2116 969.2218 26895.9510 27144.1627 969.2214 0.6991
20.0000 0.6739 244.4791 969.2214 26892.4798 27136.9590 969.2210 0.6887
20.1000 0.6713 242.1463 969.2210 26889.0106 27131.1569 969.2207 0.6804
20.2000 0.6687 241.2132 969.2207 26886.2163 27127.4295 969.2205 0.6750
20.3000 0.6661 240.2800 969.2205 26884.4212 27124.7013 969.2204 0.6711
20.4000 0.6636 239.3469 969.2204 26883.1073 27122.4542 969.2202 0.6679
20.5000 0.6610 238.4138 969.2202 26882.0252 27120.4389 969.2201 0.6650
20.6000 0.6584 237.4807 969.2201 26881.0546 27118.5353 969.2200 0.6622
Pa ge 2
tmp#7.txt
20.7000 0.6558 236.5475 969.2200 26880.1378 27116.6853 969.2199 0.6596
20.8000 0.6532 235.6144 969.2199 26879.2469 27114.8613 969.2198 0.6569
20.9000 0.6506 234.6813 969.2198 26878.3684 27113.0491 969.2197 0.6543
21.0000 0.6480 233.7482 969.2197 26877.4960 27111.2441 969.2196 0.6517
21.1000 0.6454 232.8150 969.2196 26876.6264 27109.4415 969.2196 0.6491
21.2000 0.6428 231.8819 969.2196 26875.7583 27107.6402 969.2195 0.6465
21.3000 0.6402 230.9488 969.2195 26874.8908 27105.8395 969.2194 0.6439
21.4000 0.6376 230.0157 969.2194 26874.0236 27104.0392 969.2193 0.6413
21.5000 0.6350 229.0825 969.2193 26873.1566 27102.2391 969.2192 0.6387
21.6000 0.6325 228.1494 969.2192 26872.2896 27100.4390 969.2191 0.6362
21.7000 0.6299 227.2163 969.2191 26871.4227 27098.6390 969.2190 0.6336
21.8000 0.6273 226.2831 969.2190 26870.5558 27096.8390 969.2189 0.6310
21.9000 0.6247 225.3500 969.2189 26869.6890 27095.0390 969.2188 0.6284
22.0000 0.6221 224.4169 969.2188 26868.8221 27093.2390 969.2187 0.6258
22.1000 0.6065 221.1510 969.2187 26867.9552 27089.1062 969.2185 0.6198
22.2000 0.5910 215.5522 969.2185 26865.9649 27081.5171 969.2181 0.6089
22.3000 0.5754 209.9534 969.2181 26862.3100 27072.2634 969.2176 0.5956
22.4000 0.5599 204.3547 969.2176 26857.8535 27062.2082 969.2170 0.5811
22.5000 0.5443 198.7559 969.2170 26853.0109 27051.7668 969.2165 0.5661
22.6000 0.5288 193.1572 969.2165 26847.9824 27041.1396 969.2159 0.5508
22.7000 0.5132 187.5584 969.2159 26842.8643 27030.4228 969.2153 0.5353
22.8000 0.4977 181.9596 969.2153 26837.7032 27019.6628 969.2148 0.5198
22.9000 0.4821 176.3609 969.2148 26832.5212 27008.8821 969.2142 0.5043
23.0000 0.4666 170.7621 969.2142 26827.3293 26998.0914 969.2136 0.4888
23.1000 0.4510 165.1634 969.2136 26822.1326 26987.2959 969.2131 0.4732
23.2000 0.4355 159.5646 969.2131 26816.9335 26976.4981 969.2125 0.4577
23.3000 0.4199 153.9659 969.2125 26811.7333 26965.6992 969.2119 0.4421
23.4000 0.4044 148.3671 969.2119 26806.5326 26954.8997 969.2113 0.4266
23.5000 0.3888 142.7683 969.2113 26801.3316 26944.0999 969.2108 0.4110
23.6000 0.3733 137.1696 969.2108 26796.1305 26933.3000 969.2102 0.3955
23.7000 0.3577 131.5708 969.2102 26790.9293 26922.5001 969.2096 0.3799
23.8000 0.3421 125.9721 969.2096 26785.7281 26911.7002 969.2090 0.3644
23.9000 0.3266 120.3733 969.2090 26780.5269 26900.9002 969.2085 0.3488
24.0000 0.3110 114.7745 969.2085 26775.3257 26890.1002 969.2079 0.3333
24.1000 0.2955 109.1758 969.2079 26770.1244 26879.3002 969.2073 0.3177
24.2000 0.2799 103.5770 969.2073 26764.9232 26868.5002 969.2067 0.3022
24.3000 0.2644 97.9783 969.2067 26759.7220 26857.7003 969.2062 0.2866
24.4000 0.2488 92.3795 969.2062 26754.5208 26846.9003 969.2056 0.2711
24.5000 0.2333 86.7808 969.2056 26749.3195 26836.1003 969.2050 0.2555
24.6000 0.2177 81.1820 969.2050 26744.1183 26825.3003 969.2044 0.2400
24.7000 0.2022 75.5832 969.2044 26738.9171 26814.5003 969.2039 0.2244
24.8000 0.1866 69.9845 969.2039 26733.7158 26803.7003 969.2033 0.2088
24.9000 0.1711 64.3857 969.2033 26728.5146 26792.9003 969.2027 0.1933
25.0000 0.1555 58.7870 969.2027 26723.3134 26782.1003 969.2021 0.1777
25.1000 0.1400 53.1882 969.2021 26718.1122 26771.3004 969.2016 0.1622
25.2000 0.1244 47.5894 969.2016 26712.9109 26760.5004 969.2010 0.1466
25.3000 0.1089 41.9907 969.2010 26707.7097 26749.7004 969.2004 0.1311
25.4000 0.0933 36.3919 969.2004 26702.5085 26738.9004 969.1998 0.1210
25.5000 0.0778 30.7932 969.1998 26695.3265 26726.1196 969.1988 0.1253
25.6000 0.0622 25.1944 969.1988 26681.0038 26706.1983 969.1973 0.1320
25.7000 0.0467 19.5957 969.1973 26658.6791 26678.2748 969.1951 0.1414
25.8000 0.0311 13.9969 969.1951 26627.3870 26641.3839 969.1923 0.1537
25.9000 0.0156 8.3981 969.1923 26586.0456 26594.4437 969.1888 0.1694
26.0000 0.0000 2.7994 969.1888 26533.4426 26536.2420 969.1843 0.1890
Page 3
tmp#8.txt
storage Indication Method
Given Input Data:
File ......
Description ....
Time increment . 0.1000 hrs
Input Files:
Pre-Dev Hydrograph curve .. G:\ Land Projects 3\101-027\hd\100-year storm (pre).hdc
Post-Dev Hydrograph curve G:\Land Projects 3\101-027\hd\100-year storm.hdc
Stage-Storage curve ....... G:\Land Projects 3\101-027\hd\StageStorage.ssc
stage-Discharge curve ..... G:\Land Projects 3\101-027\hd\stagedischarge.sdc
Output Data:
Routed Peak Flow ......... 61.8713 cfs
Routed Peak Time .... 12.2000 hrs
Pre-Developed Peak Flow .. 46.8068 cfs
Pre-Developed Peak Time .. 12.1000 hrs
Post-Developed Peak Flow 80.8793 cfs
Post-Developed Peak Time 12.1000 hrs
support calculations:
----------
Time ----------
Inflow -----------
(Il+I2)/2 ---------
H1 --------------------------------
Sl-(01/2)T S2+(02/2)T H2 ----------
outflow
hrs cfs ft3 ft ft3 ft3 ft cfs
----------
11.0000 ----------
1.9219 -----------
345.9394 ---------
0.0000 -----------
0.0000 -----------
345.9394 ----------
967.0305 ----------
0.0024
11.1000 2.1888 739.9259 967.0305 345.0615 1084.9875 967.0956 0.0076
11.2000 2.4557 836.0202 967.0956 1082.2342 1918.2544 967.1690 0.0135
11.3000 2.7227 932.1145 967.1690 1913.3867 2845.5012 967.2507 0.0201
11.4000 3.2298 1071.4512 967.2507 2838.2805 3909.7316 967.3445 0.0276
11.5000 3.7370 1254.0303 967.3445 3899.8104 5153.8407 967.4541 0.0363
11.6000 4.2442 1436.6094 967.4541 5140.7624 6577.3718 967.5795 0.0464
11.7000 11.7449 2878.0235 967.5795 6560.6812 9438.7047 967.8316 0.0665
11.8000 19.2455 5578.2727 967.8316 9414.7533 14993.0259 968.2854 0.3426
11.9000 26.7462 8278.5218 968.2854 14869.7005 23148.2222 968.9242 0.9303
12.0000 51.8108 14140.2726 968.9242 22813.3290 36953.6016 969.7434 14.8248
12.1000 80.8793 23884.2320 969.7434 31616.6643 55500.8963 970.5589 50.5055
12.2000 50.2893 23610.3633 970.5589 37318.9111 60929.2745 970.7800 61.8713
12.3000 17.3770 12179.9493 970.7800 38655.6109 50835.5603 970.3689 40.7374
12.4000 11.7715 5246.7474 970.3689 36170.1051 41416.8525 969.9809 21.2520
12.5000 9.8497 3891.8181 969.9809 33766.1471 37657.9652 969.7808 15.8391
12.6000 8.3282 3272.0101 969.7808 31955.8829 35227.8929 969.6515 12.3398
12.7000 6.8868 2738.6868 969.6515 30785.5703 33524.2571 969.5609 9.8865
12.8000 6.0860 2335.0909 969.5609 29965.1064 32300.1973 969.4958 8.1239
12.9000 5.6856 2118.8788 969.4958 29375.6044 31494.4832 969.4529 6.9636
13.0000 5.2852 1974.7373 969.4529 28987.5759 30962.3132 969.4246 6.1973
13.1000 4.9248 1837.8030 969.4246 28731.2851 30569.0881 969.4036 5.6311
13.2000 4.5645 1708.0757 969.4036 28541.9095 30249.9852 969.3867 5.1715
13.3000 4.3242 1599.9697 969.3867 28388.2309 29988.2006 969.3727 4.7946
13.4000 4.0840 1513.4848 969.3727 28262.1565 29775.6413 969.3614 4.4885
13.5000 3.8838 1434.2071 969.3614 28159.7889 29593.9959 969.3518 4.2269
13.6000 3.6836 1362.1363 969.3518 28072.3092 29434.4456 969.3433 3.9972
13.7000 3.5235 1297.2727 969.3433 27995.4704 29292.7432 969.3357 3.7931
13.8000 3.3633 1239.6161 969.3357 27927.2272 29166.8433 969.3290 3.6118
13.9000 3.2031 1181.9596 969.3290 27866.5943 29048.5539 969.3227 3.4415
14.0000 3.0430 1124.3030 969.3227 27809.6266 28933.9297 969.3166 3.2764
14.1000 2.9362 1076.2559 969.3166 27754.4241 28830.6800 969.3111 3.1277
14.2000 2.8294 1037.8182 969.3111 27704.6995 28742.5176 969.3064 3.0008
14.3000, 2.7227 999.3805 969.3064 27662.2409 28661.6213 969.3021 2.8843
Page 1
tmp#8.txt
14.4000 2.6693 910.5522 969.3021 27623.2815 28593.8337 969.2985 2.7867
14.5000 2.6159 951.3333 969.2985 27590.6353 28541.9686 969.2958 2.7120
14.6000 2.5625 932.1145 969.2958 27565.6573 28497.7718 969.2934 2.6483
14.7000 2.5025 911.6944 969.2934 27544.3723 28456.0667 969.2912 2.5883
14.8000 2.4424 890.0732 969.2912 27524.2873 28414.3605 969.2890 2.5282
14.9000 2.3823 868.4520 969.2890 27504.2018 28372.6538 969.2868 2.4682
15.0000 2.3223 846.8308 969.2868 27484.1160 28330.9468 969.2845 2.4081
15.1000 2.2742 827.3717 969.2845 27464.0301 28291.4018 969.2824 2.3512
15.2000 2.2262 810.0747 969.2824 27444.9854 28255.0601 969.2805 2.2988
15.3000 2.1781 792.7778 969.2805 27427.4834 28220.2611 969.2787 2.2487
15.4000 2.1301 775.4808 969.2787 27410.7243 28186.2051 969.2768 2.1997
15.5000 2.0820 758.1838 969.2768 27394.3231 28152.5069 969.2751 2.1511
15.6000 2.0340 740.8869 969.2751 27378.0942 28118.9811 969.2733 2.1029
15.7000 1.9859 723.5899 969.2733 27361.9483 28085.5382 969.2715 2.0547
15.8000 1.9379 706.2929 969.2715 27345.8423 28052.1352 969.2697 2.0066
15.9000 1.8899 688.9960 969.2697 27329.7556 28018.7516 969.2679 1.9585
16.0000 1.8418 671.6990 969.2679 27313.6782 27985.3772 969.2662 1.9105
16.1000 1.8098 657.2848 969.2662 27297.6052 27954.8900 969.2645 1.8666
16.2000 1.7777 645.7535 969.2645 27282.9227 27928.6763 969.2631 1.8288
16.3000 1.7457 634.2222 969.2631 27270.2983 27904.5205 969.2619 1.7940
16.4000 1.7137 622.6909 969.2619 27258.6650 27881.3559 969.2606 1.7607
16.5000 1.6816 611.1596 969.2606 27247.5090 27858.6686 969.2594 1.7280
16.6000 1.6656 602.5111 969.2594 27236.5829 27839.0940 969.2584 1.6998
16.7000 1.6496 596.7454 969.2584 27227.1558 27823.9013 969.2576 1.6780
16.8000 1.6336 590.9798 969.2576 27219.8391 27810.8189 969.2569 1.6591
16.9000 1.6176 585.2141 969.2569 27213.5387 27798.7528 969.2562 1.6417
17.0000 1.6016 579.4485 969.2562 27207.7277 27787.1762 969.2556 1.6251
17.1000 1.5856 573.6828 969.2556 27202.1524 27775.8353 969.2550 1.6087
17.2000 1.5695 567.9172 969.2550 27196.6907 27764.6079 969.2544 1.5926
17.3000 1.5535 562.1515 969.2544 27191.2836 27753.4352 969.2538 1.5765
17.4000 1.5375 556.3859 969.2538 27185.9029 27742.2888 969.2532 1.5604
17.5000 1.5215 550.6202 969.2532 27180.5349 27731.1550 969.2526 1.5444
17.6000 1.5055 544.8545 969.2526 27175.1729 27720.0274 969.2520 1.5284
17.7000 1.4895 539.0889 969.2520 27169.8139 27708.9028 969.2514 1.5124
17.8000 1.4734 533.3232 969.2514 27164.4563 27697.7795 969.2509 1.4963
17.9000 1.4574 527.5576 969.2509 27159.0994 27686.6570 969.2503 1.4803
18.0000 1.4414 521.7919 969.2503 27153.7428 27675.5347 969.2497 1.4643
18.1000 1.4174 514.5848 969.2497 27148.3864 27662.9712 969.2490 1.4462
18.2000 1.3934 505.9364 969.2490 27142.3359 27648.2722 969.2482 1.4250
18.3000 1.3693 497.2879 969.2482 27135.2569 27632.5448 969.2474 1.4024
18.4000 1.3453 488.6394 969.2474 27127.6826 27616.3220 969.2465 1.3790
18.5000 1.3213 479.9909 969.2465 27119.8698 27599.8607 969.2456 1.3553
18.6000 1.2973 471.3424 969.2456 27111.9421 27583.2845 969.2448 1.3315
18.7000 1.2732 462.6939 969.2448 27103.9591 27566.6530 969.2439 1.3075
18.8000 1.2492 454.0454 969.2439 27095.9494 27549.9949 969.2430 1.2835
18.9000 1.2252 445.3970 969.2430 27087.9269 27533.3239 969.2421 1.2595
19.0000 1.2012 436.7485 969.2421 27079.8982 27516.6467 969.2412 1.2355
19.1000 1.1852 429.5414 969.2412 27071.8666 27501.4080 969.2404 1.2136
19.2000 1.1691 423.7758 969.2404 27064.5277 27488.3035 969.2397 1.1947
19.3000 1.1531 418.0101 969.2397 27058.2166 27476.2267 969.2391 1.1773
19.4000 1.1371 412.2444 969.2391 27052.4005 27464.6449 969.2385 1.1606
19.5000 1.1211 406.4788 969.2385 27046.8227 27453.3015 969.2378 1.1443
19.6000 1.1051 400.7131 969.2378 27041.3598 27442.0729 969.2373 1.1281
19.7000 1.0891 394.9475 969.2373 27035.9522 27430.8997 969.2367 1.1120
19.8000 1.0731 389.1818 969.2367 27030.5712 27419.7530 969.2361 1.0960
19.9000 1.0570 383.4162 969.2361 27025.2030 27408.6191 969.2355 1.0799
20.0000 1.0410 377.6505 969.2355 27019.8410 27397.4915 969.2349 1.0639
20.1000 1.0370 374.0470 969.2349 27014.4819 27388.5289 969.2344 1.0510
20.2000 1.0330 372.6056 969.2344 27010.1656 27382.7711 969.2341 1.0427
20.3000 1.0290 371.1641 969.2341 27007.3927 27378.5568 969.2339 1.0366
20.4000 1.0250 369.7227 969.2339 27005.3631 27375.0858 969.2337 1.0317
20.5000 1.0210 368.2813 969.2337 27003.6915 27371.9728 969.2335 1.0272
20.6000 1.0170 366.8399 969.2335 27002.1922 27369.0321 969.2334 1.0229
Page 2
tmp#8.txt
20.7000 1.0130 365.3985 969.2334 27000.7760 27366.1745 969.2332 1.0188
20.8000 1.0090 363.9571 969.2332 26999.3998 27363.3569 969.2331 1.0148
20.9000 1.0050 362.5157 969.2331 26998.0429 27360.5585 969.2329 1.0107
21.0000 1.0010 361.0742 969.2329 26996.6952 27357.7694 969.2328 1.0067
21.1000 0.9970 359.6328 969.2328 26995.3520 27354.9848 969.2326 1.0027
21.2000 0.9930 358.1914 969.2326 26994.0109 27352.2023 969.2325 0.9987
21.3000 0.9890 356.7500 969.2325 26992.6709 27349.4208 969.2323 0.9947
21.4000 0.9850 355.3086 969.2323 26991.3313 27346.6399 969.2322 0.9907
21.5000 0.9810 353.8672 969.2322 26989.9920 27343.8592 969.2320 0.9867
21.6000 0.9770 352.4258 969.2320 26988.6529 27341.0786 969.2319 0.9827
21.7000 0.9730 350.9843 969.2319 26987.3137 27338.2981 969.2317 0.9787
21.8000 0.9690 349.5429 969.2317 26985.9746 27335.5176 969.2316 0.9747
21.9000 0.9649 348.1015 969.2316 26984.6356 27332.7371 969.2314 0.9707
22.0000 0.9609 346.6601 969.2314 26983.2965 27329.9566 969.2313 0.9667
22.1000 0.9369 341.6151 969.2313 26981.9574 27323.5726 969.2309 0.9575
22.2000 0.9129 332.9667 969.2309 26978.8829 27311.8496 969.2303 0.9406
22.3000 0.8889 324.3182 969.2303 26973.2371 27297.5553 969.2296 0.9200
22.4000 0.8648 315.6697 969.2296 26966.3531 27282.0228 969.2287 0.8976
22.5000 0.8408 307.0212 969.2287 26958.8727 27265.8939 969.2279 0.8744
22.6000 0.8168 298.3727 969.2279 26951.1051 27249.4778 969.2270 0.8508
22.7000 0.7928 289.7242 969.2270 26943.1992 27232.9234 969.2261 0.8269
22.8000 0.7688 281.0758 969.2261 26935.2267 27216.3024 969.2252 0.8030
22.9000 0.7447 272.4273 969.2252 26927.2220 27199.6493 969.2244 0.7790
23.0000 0.7207 263.7788 969.2244 26919.2020 27182.9808 969.2235 0.7550
23.1000 0.6967 255.1303 969.2235 26911.1745 27166.3048 969.2226 0.7310
23.2000 0.6727 246.4818 969.2226 26903.1434 27149.6252 969.2217 0.7070
23.3000 0.6486 237.8333 969.2217 26895.1106 27132.9439 969.2208 0.6830
23.4000 0.6246 229.1848 969.2208 26887.0769 27116.2618 969.2199 0.6589
23.5000 0.6006 220.5364 969.2199 26879.0429 27099.5793 969.2190 0.6349
23.6000 0.5766 211.8879 969.2190 26871.0087 27082.8965 969.2181 0.6109
23.7000 0.5525 203.2394 969.2181 26862.9743 27066.2137 969.2173 0.5869
23.8000 0.5285 194.5909 969.2173 26854.9400 27049.5309 969.2164 0.5628
23.9000 0.5045 185.9424 969.2164 26846.9056 27032.8480 969.2155 0.5388
24.0000 0.4805 177.2939 969.2155 26838.8712 27016.1651 969.2146 0.5148
24.1000 0.4564 168.6455 969.2146 26830.8368 26999.4822 969.2137 0.4908
24.2000 0.4324 159.9970 969.2137 26822.8023 26982.7993 969.2128 0.4668
24.3000 0.4084 151.3485 969.2128 26814.7679 26966.1164 969.2119 0.4427
24.4000 0.3844 142.7000 969.2119 26806.7335 26949.4335 969.2110 0.4187
24.5000 0.3604 134.0515 969.2110 26798.6991 26932.7506 969.2101 0.3947
24.6000 0.3363 125.4030 969.2101 26790.6647 26916.0677 969.2093 0.3707
24.7000 0.3123 116.7545 969.2093 26782.6303 26899.3848 969.2084 0.3466
24.8000 0.2883 108.1061 969.2084 26774.5959 26882.7019 969.2075 0.3226
24.9000 0.2643 99.4576 969.2075 26766.5615 26866.0190 969.2066 0.2986
25.0000 0.2402 90.8091 969.2066 26758.5270 26849.3361 969.2057 0.2746
25.1000 0.2162 82.1606 969.2057 26750.4926 26832.6532 969.2048 0.2505
25.2000 0.1922 73.5121 969.2048 26742.4582 26815.9703 969.2039 0.2265
25.3000 0.1682 64.8636 969.2039 26734.4238 26799.2874 969.2030 0.2025
25.4000 0.1441 56.2152 969.2030 26726.3894 26782.6045 969.2022 0.1785
25.5000 0.1201 47.5667 969.2022 26718.3550 26765.9216 969.2013 0.1544
25.6000 0.0961 38.9182 969.2013 26710.3206 26749.2387 969.2004 0.1304
25.7000 0.0721 30.2697 969.2004 26702.2861 26732.5558 969.1993 0.1232
25.8000 0.0480 21.6212 969.1993 26688.2165 26709.8377 969.1976 0.1308
25.9000 0.0240 12.9727 969.1976 26662.7577 26675.7304 969.1950 0.1422
26.0000 0.0000 4.3242 969.1950 26624.5356 26628.8599 969.1914 0.1579
Page 3
Temporary Skimmer Basin #1
Disturbed Area 11.00 Ac.
Drainage Area 12.70 Ac.
Minimum Storage Required = 11.00
Q10 (TR55 Method)
CN 75
Tc 5 min
10 Year Rainfall 4.8 Inches
Required Basin Area= 0.01 X 45.8
Basin Dimensions
Side Slopes of Basin=
2W X W = Surface Area Leng th to Width Ratio 2
W= 100 ft.
Top Basin Size 100 x
Bottom Size 86 x
Skimmer Size (Faircloth Sizes)
Skimmer Size 3 Inches
Ouflow from Skimmer 0.11 CFS
Primary Spillwa
Sed. Storage Depth=
X 1800
45.8 CFS
19950 SF
2to1
200
186
3.5 ft.
19800 cu.ft.
Riser Size 36 Inches 30 Barrel Size (5' Head)
Primary Spillway Flow 42.06 CFS (Table 8.07(a) Erosion Control Manual
Storage Provided
Top Basin Area =
Bottom Basin Area =
Avg. Surface Area of Sediment =
Sediment Storage Provided =
19950 sq.ft.
15952 sq.ft.
17951 sq.ft.
62829 cu.ft.