HomeMy WebLinkAboutWPO201400021 Calculations 2014-03-11 TEMPORARY SEDIMENT BASIN DESIGN DATA SHEET
(with or without an emergency spillway)
Project Riverside Village
Basin#1 Location: South of Main Entrance
Total area draining to basin: 7.63 acres
Basin Volume Design
Wet Storage:
1. Minimum required volume= 67 cu. yds. x Total Drainage Area(acres).
67 cu. yds. x 7.63 acres = 511 cu. yds.
2. Available basin volume = 526 cu. yds. at elevation 337.9
(From storage - elevation curve)
3. Excavate cu. yds. to obtain required volume*.
*Elevation corresponding to required volume = invert of the dewatering orifice.
4. Available volume before cleanout required.
33 cu. yds. x 7.63 acres = 252 cu. yds.
5. Elevation corresponding to cleanout level = 336.2
(From Storage - Elevation Curve)
6. Distance from invert of the dewatering orifice to cleanout level = 1.7 ft
(Min. = 1.0 ft.)
Dry Storage:
7. Minimum required volume = 67 cu. yds. x Total Drainage Area(acres).
67 cu. yds. x 7.63 acres = 511 cu. yds.
8. Total available basin volume at crest of riser* = 524 cu. yds. at
elevation 340.4 (From Storage - Elevation Curve)
* Minimum= 101 cu. yds./acre of total drainage area.
9. Diameter of dewatering orifice = 5 in.
10. Diameter of flexible tubing = 7 in. (diameter of dewatering orifice
plus 2 inches).
Preliminary Design Elevations
11. Crest of Riser = 337.0
Top of Dam = 344.0
Design High Water = 343.0
Upstream Toe of Dam = 334.0
Basin Shape
12. Length of Flow L =
Effective Width We 2.0
If>2, baffles are not required
If<2, baffles are required
Runoff
13. Q2 = 19.7 cfs (From Chapter 5)
14. Q25 = 30.2 cfs (From Chapter 5)
Principal Spillway Design
15. With emergency spillway, required spillway capacity Qp = Q2 = 19.7
(riser and barrel)
Without emergency spillway, required spillway capacity Qp = Q25 = 30.2
(riser and barrel)
16. With emergency spillway:
Assumed available head (h) = 2.6 ft. (Using Q2)
h= Crest of Emergency Spillway Elevation- Crest of Riser Elevation
Without emergency spillway:
Assumed available head (h) = 1.6 ft. (Using Q25)
h= Design High Water Elevation- Crest of Riser Elevation
17. Riser Diameter(Dr) = 30 in. Actual head (h) = 0.9 ft
(From Plate 3.14-8.)
Note: Avoid orifice flow conditions.
18. Barrel length(1) = 46.8 ft.
Head(H) on barrel through embankment= 5.4 ft.
(From Plate 3.14-7).
19. Barrel diameter= 24 in.
(From Plate 3.14-B [concrete pipe] or Plate 3.14-A [corrugated pipe]).
20. Trash rack and anti-vortex device
Diameter= 54 inches
Height= 17 inches
(From Table 3.14-D).
Emergency Spillway Design
21. Required spillway capacity Qe= Q25 - Qp = 6.2 cfs
22. Bottom width(b) = 8 ft.; the slope of the exit channel (s) =
3.7 ft./foot; and the minimum length of the exit channel (x)
36 ft.
(From Table 3.14-C).
Anti-Seep Collar Design
23. Depth of water at principal spillway crest (Y) = 3.4 ft
Slope of upstream face of embankment(Z) = 2.5:1
Slope of principal spillway barrel (Sb) = 2.1%
Length of barrel in saturated zone (LS) = 28 ft
24. Number of collars required= 1 dimensions= 4.8 ft
(from Plate 3.14-12).
Final Design Elevations
25. Top of Dam = 344.0
Design High Water = 341.9
Emergency Spillway Crest = 341.4
Principal Spillway Crest = 340.4
Dewatering Orifice Invert = 337.9
Cleanout Elevation = 336.2
Elevation of Upstream Toe of Dam
or Excavated Bottom of"Wet Storage
Area" (if excavation was performed) = 334.0
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TEMPORARY SEDIMENT BASIN DESIGN DATA SHEET
(with or without an emergency spillway)
Project Riverside Village
Basin#2 Location: Back of site
Total area draining to basin: 8.54 acres
Basin Volume Design
Wet Storage:
1. Minimum required volume = 67 cu. yds. x Total Drainage Area(acres).
67 cu. yds. x 8.54 acres = 572 cu. yds.
2. Available basin volume = 580 cu. yds. at elevation 336.7
(From storage - elevation curve)
3. Excavate cu. yds. to obtain required volume*.
*Elevation corresponding to required volume= invert of the dewatering orifice.
4. Available volume before cleanout required.
33 cu. yds. x 8.54 acres = 282 cu. yds.
5. Elevation corresponding to cleanout level = 335.4
(From Storage - Elevation Curve)
6. Distance from invert of the dewatering orifice to cleanout level = 1.3 ft
(Min. = 1.0 ft.)
Dry Storage:
7. Minimum required volume = 67 cu. yds. x Total Drainage Area(acres).
67 cu. yds. x 8.54 acres= 572 cu. yds.
8. Total available basin volume at crest of riser* = 599 cu. yds. at
elevation 338.9 (From Storage - Elevation Curve)
* Minimum= 101 cu. yds./acre of total drainage area.
9. Diameter of dewatering orifice= 6 in.
10. Diameter of flexible tubing= 8 in. (diameter of dewatering orifice
plus 2 inches).
Preliminary Design Elevations
11. Crest of Riser = 336.4
Top of Dam = 342.0
Design High Water = 341.0
Upstream Toe of Dam = 333.6
Basin Shape
12. Length of Flow L =
Effective Width We 2.0
If> 2, baffles are not required
If<2, baffles are required
Runoff
13. Q2 = 22.0 cfs (From Chapter 5)
14. Q25 = 33.8 cfs (From Chapter 5)
Principal Spillway Design
15. With emergency spillway, required spillway capacity Qp= Q2 = 22.0
(riser and barrel)
Without emergency spillway, required spillway capacity Qp = Q25 = 33.8
(riser and barrel)
16. With emergency spillway:
Assumed available head (h) = 2.1 ft. (Using Q2)
h= Crest of Emergency Spillway Elevation- Crest of Riser Elevation
Without emergency spillway:
Assumed available head (h) = 1.1 ft. (Using Q25)
h= Design High Water Elevation - Crest of Riser Elevation
17. Riser Diameter(Dr) = 30 in. Actual head (h) = 1.0 ft
(From Plate 3.14-8.)
Note: Avoid orifice flow conditions.
18. Barrel length(1) = 40.6 ft.
Head (H) on barrel through embankment= 5.4 ft.
(From Plate 3.14-7).
19. Barrel diameter= 24 in.
(From Plate 3.14-B [concrete pipe] or Plate 3.14-A [corrugated pipe]).
20. Trash rack and anti-vortex device
Diameter= 54 inches
Height= 17 inches
(From Table 3.14-D).
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Emergency Spillway Design
21. Required spillway capacity Qe= Q25 - Qp= 9.8 cfs
22. Bottom width(b) = 8 ft.; the slope of the exit channel (s) _
3.5 ft./foot; and the minimum length of the exit channel (x) =
39 ft.
(From Table 3.14-C).
Anti-Seep Collar Design
23. Depth of water at principal spillway crest(Y) = 2.5 ft
Slope of upstream face of embankment(Z) = 2.5:1
Slope of principal spillway barrel (Sb) = 2.5%
Length of barrel in saturated zone (LS) = 22 ft
24. Number of collars required= 1 dimensions = 4.1 ft
(from Plate 3.14-12).
Final Design Elevations
25. Top of Dam = 342.0
Design High Water = 340.6
Emergency Spillway Crest = 339.9
Principal Spillway Crest = 338.9
Dewatering Orifice Invert = 336.7
Cleanout Elevation = 335.4
Elevation of Upstream Toe of Dam
or Excavated Bottom of"Wet Storage
Area" (if excavation was performed) = 333.6
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