Property Panel

On the Storm Drain and Culvert tabs, the property panel is docked inline to the right of the profile canvas (not a separate window) and shows a compact set of fields for the currently selected pipe: navigation, slope settings, shape/part family, and junction loss assignment. Pipe size, invert elevations, friction coefficient, and design flow are edited directly in the results grid instead of here. All edits take effect immediately in the profile view and trigger an automatic recalculation. Multi-pipe editing actions like Raise/Lower, Set Slope, Match Slope, and Match to Adjacent are available via the right-click context menu on the profile or grid (see Pipe Editing).

Pipe Navigation

At the top of the property panel, ◀ Prev and Next ▶ buttons let you step through pipes in the network sequentially. You can also use the Left and Right arrow keys as a keyboard shortcut. The current pipe name is displayed above the navigation buttons.

Slope

Field	Description
Match	Dropdown to select the structure transition criterion used when applying a continuous slope across multiple pipes: Inverts (fixed structure drop), Centerlines, or Crowns.
Anchor	Dropdown to select which end is held fixed during slope operations: Downstream (hold outfall end, adjust upstream) or Upstream (hold headwater end, adjust downstream).
Slope %	Type a slope and click Apply to lay out the selected pipes from the chosen anchor end, using the Match criterion for structure transitions. Only enabled with more than one pipe selected. Slope must be positive (downhill).

Invert elevations, and single-pipe slope, are edited directly in the Inv_DS / Inv_US / Slope % columns of the results grid — changing an invert recomputes slope holding the other invert fixed, and changing slope holds the downstream invert fixed and recomputes the upstream invert.

Pipe

Field	Description
Shape	Pipe cross-section shape: Circular or Box. Switching to Box enables the Span column in the results grid; on Apply the pipe swaps to a matching part family in Civil 3D.
Family	Dropdown to choose the pipe material and type from the Civil 3D parts list (e.g., "Concrete - Circular Pipe", "RCP Class III"). Changing the part family may change the available sizes.

Size, span (box pipes), and friction coefficient (Manning's n or Hazen-Williams C) are edited in the results grid's Size, Span, and Mannings n columns.

Junction Loss

Field	Description
Type	Dropdown to assign a junction loss type from the active design standard to the selected pipe's upstream node. The list shows all loss types defined in the selected standard. HydraStorm suggests loss types by matching Civil 3D part descriptions (see Junction Losses) — suggestions are confirmed in the Structures table, never auto-applied. This dropdown lets you override the assignment for the currently selected pipe directly.
Kj	Manual override for the junction loss coefficient, shown next to the resolved default value for reference. Leave this field blank to use the default value computed by the loss type's equation. Enter a value to override — a value of 0 is valid and forces zero junction loss at this structure.

The junction loss coefficient K_j determines the energy loss at each structure. The method used to compute it depends on the loss type's equation kind — it may be a user-authored expression like K * V_o² / (2g), the HEC-22 2nd Edition compound K method, or the HEC-22 4th Edition 3-step access-hole energy method. See Junction Losses and Loss Library for details.

Actions

Pinned to the bottom of the panel, below the scrollable input sections, so they stay reachable at any pane height:

Button	Description
Auto	Runs Auto Design pipe sizing.
Apply	Pushes all unsaved edits (manual + Auto Design) to Civil 3D.
Discard	Discards all unsaved edits and reverts to the last applied state.