HomeMy WebLinkAboutWPO201600035 Other 2016-05-03 (3)Basin Storage Volume
North Pointe Section 1
Elevation
Area of Contour
Volume
36.07
Lowest 439.00
8520
0
441.00
10717
19,195
442.00
11899
30,498
443.00
13148
43,016
444.00
14462
56,816
445.00
20329
74,128
446.00
26975
97,702
447.00
29477
125,919
448.00
32039
156,668
449.00
34672
190,015
450.00
37355
226,020
451.00
238,472
Wet
Volume of Interest
= 43416
Corresponding Elevation = 443.03
Dry Volume of Interest = 86832
Corresponding Elevation = 445.54
Cleanout Volume of Interest = 21708
Corresponding Elevation = 441.22
19,195
30,498
43,016
56,816
74,128
97,702
125,919
156,668
190,015
226,020
238,472
439.00
441.00
442.00
443.00
444.00
445.00
446.00
447.00
448.00
449.00
450
451
441.00
442.00
443.00
444.00
445.00
446.00
447.00
448.00
449.00
450.00
451.00
10717.0
11899.0
13148.0
14462.0
20329.0
26975.0
29477.0
32039.0
34672.0
37355.0
(Top of Riser)Elevation of Interest = 447.00
Corresponding Volume = 125919
Corresponding area = 29477
wet provided= 1918.169
Other Elev. Of Interest = 1 445.00
Corresponding Volume = 74128.44
Corresponding area = 20329
dry provided= 2745.498
Volumes area calculated using the Conic Method for calculating reservoir volumes.
NOTE: Type in elevations with the lowest elevation at the top through to the highest. Leave zeros
after the highest elevation.
Volumes area calculated using the Conic Method for calculating reservoir volumes.
4/21/2016 TOWNES SITE ENGINEERING
North Pointe Section 1
1992
TEMPORARY SEDIMENT BASIN DESIGN DATA SHEET
(With or without emergency Spillway)
Project North Pointe Section 1
Basin # 1
Total area draining to basin
24 acres.
Basin Volume Design
Wet Storage:
3 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67 cu. yds. x 24 acres = 1608 cu. yds.
2 Available basin volume = 2745 cu. yds. at elevation
(From storage - elevation curve)
3 Excavate 2745 cu, yds. to obtain required volume *.
* Elevation corresponding to required volume = invert of the dewatering
orifice. 445.00 dewatering device elevation
4 Available volume before cleanout required.
33 cu. yds. x 24 acres = 792 cu. yds.
5 Elevation corresponding to cleanout level = 444.00
(From Storage - Elevation Curve)
6 Distance from invert of the dewatering orifice to cleanout level (ft)=
(Min. = 1.0 ft.)
445.00
441.22
Dry Storage:
7 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67cu.yds.X 24 acres = 1608 cu. yds.
3.14
1.00
1992
Total available basin volume at 2ND Stage * = 4664
elevation 447.00 . (From Storage - Elevation Curve)
* Minimum = 134 cu. yds./acre of total drainage area.
9 Diameter of dewatering orifice = 19 INCH
10 Diameter of flexible tubing = 21 INCH
plus 2 inches).
Preliminary Design Elevations
11 Crest of Riser = 447.00
Top of Dam = 450.00
Upstream Toe of Dam = 434.00
Basin Shape
12 Length of Flow L =
Effective Width We 4.43
If > 2, baffles are not required Not Required
If < 2, baffles are required
Runoff
3.14
cu. yds. at
13 Q2 = 12.67 cfs (From Chapter 5)
14 Q25 = 21.02 cfs (From Chapter 5)
Principal Spillway Design
cfs.
15 With emergency spillway, required spillway capacity Qp=Q2 12.67
(riser and barrel)
Without emergency spillway, required spillway capacity Qp=Q25 21.02
(riser and barrel)
III - 113
North Pointe Section 1
1992 3.14
203 With emergency spillway:
Assumed available head (h) = N/A ft. (Using Q2)
h = Crest of Emergency Spillway Elevation - Crest of Riser Elevation
87.72 Without emergency spillway:
Assumed available head (h) = 3 ft. (Using Q25)
h = Design High Water Elevation - Crest of Riser Elevation
17 Riser diameter (Dr) = 48 in. Actual head (h) = 0.7 ft.
(From Plate 3.14-8.)
Note: Avoid orifice flow conditions.
18 Barrel Length (1) = 78.869 ft.
Head (H) on barrel through embankment = 13.65 ft.
(From Plate 3.14-7).
19 Barrel diameter = 42 in.
(From Plate 3.14-B [concrete pipe] or Plate 3.14-A [corrugated pipe]).
20 Trash rack and anti -vortex device
Diameter = 72 inches.
Thickness gage 14 ga. Corrugated
Height = 21 inches.
(From Table 3.14-D) USE: 1-1/4"pipe or 1-1/4 x 1-1/4x1/4angle
Emergency Spillway Design
"Emergency Spillway is being designed for the ultimate SWM/BMP. See SWM/BMP 4 sheet for
Emergency Spillway details"
21 Required spillway capacity Q. = Q25 - Qp = N/A cfs.
22 Bottom width (b) = - ft.; the slope of the exit channel (s) _
- ft./foot; and the minimum length of the exit channel (x) _
- ft.
(From Table 3.14-C).
III - 114
North Pointe Section 1
1992
23 Depth of water at principal spillway crest (Y) _
Slope of upstream face of embankment (Z)=
Slope of principal spillway barrel (Sb) _
Length of barrel in saturated zone (Ls) _
8.00 ft.
2 :1.
6.34 %
48.23 ft.
24 Number of collars required = 3 dimensions =
(From Plate 3.14-12)
25 Top of Dam = 450.00
Design High Water = 447.65
Emergency Spillway Crest = N/A
Principal Spillway Crest = 447.00
Dewatering Orifice Invert = 445.00
Cleanout Elevation = 444.00
Elevation of Upstream Toe of Dam
of Excavated Bottom of "Wet Storage
Area" (if excavation was performed) = 439.00
III - 115
3.14
5.6 X 5.6