Placing a line at the centerline points also reduces errors.ġ7 Templates A Template (*.TPL) defines the cross section design profile for each section. “Smart Corners” option in CHANNEL DESIGN gives a better result. Creating lines perpendicular to the channel centerline can exaggerate these errors. CS&V does not care if there are turns in the channel between lines. Differences between the volume results in HYPACK and other packages can result based on how the other package handles the problem of unequal coverage.ĬS&V does not care if your lines intersect.
#Cross sections in hypack full#
Full Length of Before Survey (not recommended): Computes areas based on limits of before survey. Only Where Both Surveys Have Data: Computes areas only where ‘before’ and ‘after’ section overlap. 2 2 4 4ġ5 Differing Coverage Before Dredge versus After Dredge Data No solid profile line means you have a data gap!ġ4 Testing for Gaps Click ‘Graph Options – Data’.ġ 1 Click ‘Graph Options – Data’. CS&V does not draw a solid line (black in example) across the profile, indicating the gap in the data is larger than the user- defined gap distance. CS&V colors the area, to indicate it has been included in volume computations. V24 = 200*(A2+A4)/2 Better overall result if the sectional profiles are similar.įor Interior Data Gaps: CS&V interpolates the soundings across the internal gap to compute volume quantities. It might be more accurate to leave Line 3 out of the computation. V23 = 100*(A2+A3)/2 V34 = 100*(A3+A4)/2 Since A3 is less than it should be, the volume quantity will also be less. The resulting volume would be less than the actual amount.
In the figure above: V = L * (A1 + A2) / 2. AEA1 can give a different result than Philadelphia PreDredge, even though they are both Average End Area methods!ĬS&V does not create data or extrapolate trends. Line 1 L1 L2 Line 2 L = (L1 + L2) / 2 The differences in volume quantities between HYPACK and other programs is sometimes caused by differences in the computed distance between lines.ġ0 Different Distances for Left, Middle and Right SegmentsĬS&V computes a separate distance for: LL = Left side slope LC = Center channel or… LCL = Left of Center Channel LCR = Right of Center Channel LR = Right side slope CS&V also determines the area of material in each segment: VL = LL * (A1L + A2L) / 2 Vc = Lc * (A1C + A2C) / 2 VR = LR * (A1R + A2R) / 2 It repeats this calculation for: Material Above Design Template Material in Overdepth Area Material in Supergrade Area Line 1 LL LLC LC LR LRC Line 2 Methods that divide the center channel into left and right sections can result in volume differences from methods that treat it as a single area. L2 = Distance of a line constructed from the midpoint of line 2 to a perpendicular intersection of line 1. This is considered a Prismoidal Method of Volume Calculation.ĬS&V uses the following method to determine the distance between: Non-Parallel Lines Lines of Different Length L1 = Distance of a line constructed from the midpoint of line 1 to a perpendicular intersection of line 2. It then computes the volume of each slice and sums all the slices to determine the volume for the segment. It interpolates a depth for each corner of the slice. ‘Standard HYPACK’ divides each segment into 100 slices. All volume methods in CROSS SECTIONS & VOLUMES (except ‘Standard HYPACK’) are “average end area” methods. To convert from cubic feet to cubic yards, divide the result by 27. Average Area= (A1 + A2)/2 Volume between lines 1 and 2 = L * (A1 + A2) / 2. STANDARD TEMPLATE (With Centerline Point) NON-STANDARD TEMPLATE NON-STANDARD TEMPLATE Turning BasinĪ1 = Area of material above 1st section. Left Top of Bank Right Top of Bank Centerline Left of Center Right of Center Center Channel Left Box Right Box Left Extension Distance Right Extension Distance Left Toe Right Toe Design Template Design Template Allowable Overdepth Template Overdepth TemplateĦ (With Centerline Point) NON-STANDARD TEMPLATE NON-STANDARD TEMPLATEĮven More Terminology Design Template Point STANDARD TEMPLATE (No Centerline Point) Design Template Segment DBL – Distance along the planned line, measured from the planned line origin or the centerline point. Left Top of Bank Right Top of Bank Centerline Left of Center Right of Center Design Template Allowable Overdepth Template Center Channel Supergrade Template Left Side Slope Right Side Slope Left Toe Right Toe Design Template Overdepth Template Supergrade Template CROSS SECTIONS & VOLUMES Preferred Edited Data CROSS SORT SB SELECTION Not Recommended Sorted Data Warning: Running your data through a sounding selection process can ‘bias’ your volume results. Raw Data SURVEY SINGLE BEAM EDITOR *.TID *.VEL CS&V only uses data in Edited ALL format. 1 CROSS SECTIONS AND VOLUMES (CSV) OverviewĢ SINGLE BEAM EDITING FLOW CROSS SECTIONS & VOLUMES