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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