HomeMy WebLinkAboutWPO201600035 Other 2016-05-03 (2)Basin Storage Volume
Lowest
NOTE:
North Pointe Section 1
Elevation
Area of Contour
Volume
36.07
422.00
14564
0
424.00
17203
31,730
426.00
19941
68,841
428.00
22774
111,524
430.00
31380
165,449
432.00
34626
231,428
433.00
36279
266,878
434.00
37951
303,989
435.00
39643
342,783
436.00
41352
383,278
437.50
43914
447,218
438.00
454,537
Wet
Volume of Interest
= 68959
Corresponding Elevation = 426.01
Dry Volume of Interest = 137918
Corresponding Elevation = 428.98
Cleanout Volume of Interest = 34480
Corresponding Elevation = 424.15
31,730
68,841
111,524
165,449
231,428
266,878
303,989
342,783
383,278
447,218
454,537
422.00
424.00
426.00
428.00
430.00
432.00
433.00
434.00
435.00
436.00
438
438
424.00
426.00
428.00
430.00
432.00
433.00
434.00
435.00
436.00
437.50
438.00
Volumes area calculated using the Conic Method for calculating reservoir volumes.
17203.0
19941.0
22774.0
31380.0
34626.0
36279.0
37951.0
39643.0
41352.0
43914.0
(Top of Riser)Elevation of Interest = 435.50
Corresponding Volume = 363031
Corresponding area = 40497.5
wet provided= 7317.841
Other Elev. Of Interest = 1 430.00
Corresponding Volume = 165449
Corresponding area = 31380
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.
dry provided= 6127.74
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 # 2
Total area draining to basin
38.12 acres.
Basin Volume Design
Wet Storage:
3 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67 cu. yds. x 38.12 acres = 2554 cu. yds.
2 Available basin volume = 6128 cu. yds. at elevation
(From storage - elevation curve)
3 Excavate 6128 cu, yds. to obtain required volume *.
* Elevation corresponding to required volume = invert of the dewatering
orifice. 430.00 dewatering device elevation
4 Available volume before cleanout required.
33 cu. yds. x 38.12 acres = 1258 cu. yds.
5 Elevation corresponding to cleanout level = 429.00
(From Storage - Elevation Curve)
6 Distance from invert of the dewatering orifice to cleanout level (ft)=
(Min. = 1.0 ft.)
430.00
424.15
Dry Storage:
7 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67cu.yds.X 38.12 acres = 2554 cu. yds.
III - 112
3.14
1.00
North Pointe Section 1
1992
Total available basin volume at 2ND Stage * = 13446
elevation 435.50 . (From Storage - Elevation Curve)
* Minimum = 134 cu. yds./acre of total drainage area.
9 Diameter of dewatering orifice = 24 INCH
10 Diameter of flexible tubing = 26 INCH
plus 2 inches).
Preliminary Design Elevations
11 Crest of Riser = 435.50
Top of Dam = 437.50
Upstream Toe of Dam = 422.00
Basin Shape
12 Length of Flow L =
Effective Width We 2.03
If > 2, baffles are not required Not Required
If < 2, baffles are required
Runoff
3.14
cu. yds. at
13 Q2 = 26.53 cfs (From Chapter 5)
14 Q25 = 41.63 cfs (From Chapter 5)
Principal Spillway Design
cfs.
15 With emergency spillway, required spillway capacity Qp=Q2 26.53
(riser and barrel)
Without emergency spillway, required spillway capacity Qp=Q25 41.63
(riser and barrel)
III - 113
North Pointe Section 1
1992 3.14
203 With emergency spillway:
Assumed available head (h) = 0.00 ft. (Using Q2)
h = Crest of Emergency Spillway Elevation - Crest of Riser Elevation
87.72 Without emergency spillway:
Assumed available head (h) = N/A ft. (Using Q25)
h = Design High Water Elevation - Crest of Riser Elevation
17 Riser diameter (Dr) = 48 in. Actual head (h) = 1.1 ft.
(From Plate 3.14-8.)
Note: Avoid orifice flow conditions.
18 Barrel Length (1) = 120.49 ft.
Head (H) on barrel through embankment = 14.55 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) _
13.50 ft.
2 :1.
3.32 %
70.05 ft.
24 Number of collars required = 4 dimensions =
(From Plate 3.14-12)
25 Top of Dam = 437.50
Design High Water = 436.55
Emergency Spillway Crest = 435.50
Principal Spillway Crest = 435.50
Dewatering Orifice Invert = 430.00
Cleanout Elevation = 429.00
Elevation of Upstream Toe of Dam
of Excavated Bottom of "Wet Storage
Area" (if excavation was performed) = 422.00
III - 115
3.14
5.8 X 5.8