HomeMy WebLinkAboutWPO201600035 Other 2018-12-20 (3)North Pointe Section 1
1992
TEMPORARY SEDIMENT BASIN DESIGN DATA SHEET
(With or without emergency Spillway)
Project North Pointe Section 1
Basin # 1 (SWM/BMP 1)
Total area draining to basin: 24.63 acres.
Basin Volume Design
Wet Storage:
3 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67 cu. yds. x 24.63 acres = 1650 cu. yds.
2 Available basin volume = 3281 cu. yds. at elevation
(From storage - elevation curve)
3 Excavate 3281 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 24.63 acres = 813 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
441.50
Dry Storage:
7 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67cu.yds.X 24.63 acres = 1650 cu. yds.
3.14
1.00
1992
Total available basin volume at 2ND Stage * = 6104
elevation 447.30 . (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 = 447.30
Top of Dam = 450.00
Upstream Toe of Dam = 436.00
Basin Shape
12 Length of Flow L =
Effective Width We 3.43
If > 2, baffles are not required Not Required
If < 2, baffles are required
Runoff
3.14
cu. yds. at
13 Q2 = 21.67 cfs (From Chapter 5)
14 Q25 = 35.96 cfs (From Chapter 5)
Principal Spillway Design
cfs.
15 With emergency spillway, required spillway capacity Qp=Q2 21.67
(riser and barrel)
Without emergency spillway, required spillway capacity Qp=Q25 35.96
(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) = 2.7 ft. (Using Q25)
h = Design High Water Elevation - Crest of Riser Elevation
17 Riser diameter (Dr) = 48 in. Actual head (h) = 0.9 ft.
(From Plate 3.14-8.)
Note: Avoid orifice flow conditions.
18 Barrel Length (1) = 90 ft.
Head (H) on barrel through embankment = 12.20 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 16 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
3.14
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) _
7.30 ft.
2 :1.
3.67 %
38.50 ft.
24 Number of collars required = 3 dimensions =
(From Plate 3.14-12)
25 Top of Dam = 450.00
Design High Water = 448.20
Emergency Spillway Crest = N/A
Principal Spillway Crest = 447.30
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) = 440.00
III - 115
North Pointe Section 1
1992
TEMPORARY SEDIMENT BASIN DESIGN DATA SHEET
(With or without emergency Spillway)
Project North Pointe Section 1
Basin # 2 (SWM/BMP 3)
Total area draining to basin: 45.74 acres.
Basin Volume Design
Wet Storage:
3 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67 cu. yds. x 45.74 acres = 3065 cu. yds.
2 Available basin volume = 6455 cu. yds. at elevation
(From storage - elevation curve)
3 Excavate 6455 cu, yds. to obtain required volume *.
* Elevation corresponding to required volume = invert of the dewatering
orifice. 434.00 dewatering device elevation
4 Available volume before cleanout required.
33 cu. yds. x 45.74 acres = 1509 cu. yds.
5 Elevation corresponding to cleanout level = 433.00
(From Storage - Elevation Curve)
6 Distance from invert of the dewatering orifice to cleanout level (ft)=
(Min. = 1.0 ft.)
434.00
427.69
Dry Storage:
7 Minimum required volume = 67 cu. yds. x Total Drainage Area (acres).
67cu.yds.X 45.74 acres = 3065 cu. yds.
3.14
1.00
North Pointe Section 1
1992
Total available basin volume at 2ND Stage * = 12767
elevation 438.80 . (From Storage - Elevation Curve)
* Minimum = 134 cu. yds./acre of total drainage area.
9 Diameter of dewatering orifice = 26 INCH
10 Diameter of flexible tubing = 28 INCH
plus 2 inches).
Preliminary Design Elevations
11 Crest of Riser =
Top of Dam =
Upstream Toe of Dam =
Basin Shape
441.50
421.00
12 Length of Flow L =
Effective Width We 2.25
If > 2, baffles are not required Not Required
If < 2, baffles are required
Runoff
13 Q2 = 53.06 cfs
14 Q25 = 83.25 cfs
Principal Sgillwav Desian
(From Chapter 5)
(From Chapter 5)
3.14
cu. yds. at
cfs.
15 With emergency spillway, required spillway capacity Qp=Q2 53.06
(riser and barrel)
Without emergency spillway, required spillway capacity Qp=Q25 83.25
(riser and barrel)
North Pointe Section 1
1992 3.14
203 With emergency spillway:
Assumed available head (h) = 0.45 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) = 60 in. Actual head (h) = 1.0 ft.
(From Plate 3.14-8.)
Note: Avoid orifice flow conditions.
18 Barrel Length (1) = 120 ft.
Head (H) on barrel through embankment = 19.05 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 = Winches.
Thickness gage 12 ga. Corrugated
Height = 29 inches.
(From Table 3.14-D) USE: 1-1/2"pipe or 1-1/2 x 1-1/2x1/4 angle
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 Qe = Q25 - Qp = 30.19 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 (Lj _
17.80 ft.
2 :1.
6.67 %
109.23 ft.
24 Number of collars required = 4 dimensions =
(From Plate 3.14-12)
25 Top of Dam = 441.50
Design High Water = 440.05
Emergency Spillway Crest = 439.25
Principal Spillway Crest = 438.80
Dewatering Orifice Invert = 434.00
Cleanout Elevation = 433.00
Elevation of Upstream Toe of Dam
of Excavated Bottom of "Wet Storage
Area" (if excavation was performed) = 421.00
III - 115
3.14
6.7 X 6.7