Results Table

The results table is a DataGrid displayed at the bottom of the main window. It shows the complete hydraulic calculation output for every pipe segment in the network, organized by alignment. After each calculation cycle, the table updates automatically to reflect current results.

Columns

The results table contains the following columns, left to right. All elevations are in feet, flows in cubic feet per second (cfs), velocities in feet per second (ft/s), and slopes as noted per column.

Column	Description
Pipe	Pipe segment name. Editable — must be unique.
STA_DS	Station at the downstream end of the pipe (ft, cumulative along its alignment). Read-only.
STA_US	Station at the upstream end of the pipe (ft, cumulative along its alignment). Read-only.
Length	Pipe length (ft). Read-only.
Shape	Circular or Box. Editable via dropdown — switching to Box enables the Span column; on Apply, the pipe swaps to a matching part family in Civil 3D.
Span	Box span — inside width (ft). Editable on Box pipes only (blank/inactive for circular); pushed to Civil 3D as the nearest catalog box size on Apply.
Size	Pipe size: diameter in inches for circular pipes (picked from the active part family's catalog sizes), or rise (inside height, ft) for box pipes (typed directly). Note: for box pipes, the Diameter field elsewhere mirrors this Width/Span value.
Mannings n / Hazen-Williams C	Friction coefficient. The header switches between "Mannings n" and "Hazen-Williams C" depending on the project's Friction Method setting. Editable per pipe.
Slope %	Pipe slope (%). Editable — holds the downstream invert fixed and recomputes the upstream invert.
Inv_DS	Downstream invert elevation (ft). Editable.
Inv_US	Upstream invert elevation (ft). Editable.
Q	Local design flow added at the upstream structure (cfs). Editable — sets the upstream node's design flow. Hover for a Q=CIA breakdown when the rational method is active.
Q_tot	Total accumulated flow through the pipe (cfs) — local flow at the upstream structure plus all upstream contributions. Read-only.
Q_f	Full pipe capacity (cfs) under uniform flow conditions. If Q_tot > Q_f, the pipe is over capacity. Read-only.
V_f	Full pipe velocity (ft/s). Read-only.
S_f	Friction slope S_f = h_f / L (ft/ft). Read-only.
h_f	Friction head loss (ft) through the pipe. Read-only.
K_j	Effective junction loss coefficient at the upstream structure, from the assigned loss type's lookup/expression or a manual override. Read-only here — set the type or override in the property panel or the Structures table. See Junction Losses for how it's computed.
h_j	Junction head loss (ft) at the upstream structure. Hover the cell for a formula breakdown. Read-only.
HGL_DS	HGL at the downstream end of the pipe barrel (ft). Read-only on pipe rows — edit the boundary row at the top of the alignment group to manually set the downstream HGL (e.g. pond/river water surface, or the crown of the pipe at a lateral).
HGL_US	HGL at the upstream end of the pipe barrel (ft). Read-only.
HGL_Str	HGL at the upstream structure after junction (K_j) losses (ft). Read-only.
HGL Cvr	Distance from ground/rim to HGL at the upstream structure (ft). Positive = freeboard below ground; negative = flooding. Read-only.
Comply	Design-criteria compliance score (pass/total), e.g. "4/6". Hover for details on each check; "ack" indicates acknowledged failures. Read-only.

Design Columns Only

A large results grid can get busy once every intermediate hydraulic column is visible. From the View menu, check Design Columns Only to hide the intermediate detail columns — STA DS, STA US, Q_f, S_f, h_f, K_j, h_j, and HGL_US — leaving the editable inputs plus Q_total, V_f, HGL_DS, HGL_Str, HGL Cover, and Comply. This is the set most engineers need for day-to-day design review; switch back to the full column set to dig into friction/junction loss detail or to troubleshoot a specific HGL jump.

The preset is a per-user preference — it's remembered across sessions and applies to every project you open, not saved with the .hsp file. Uncheck Design Columns Only to restore every column.

Color Coding

Rows in the results table (dark theme) carry a left severity stripe plus a light color wash to help you quickly identify design issues, without the flagged rows becoming muddy against the dark background:

Indicator	Meaning
No stripe	Normal — no warnings or errors on this pipe.
Amber stripe/wash	Warning — the pipe is approaching a design limit. Examples: velocity slightly below minimum, HGL near the pipe crown, marginal cover.
Red stripe/wash	Error — a design criterion is violated. Examples: HGL above rim (overtopping), velocity exceeds maximum, pipe over capacity (Q_tot > Q_f), insufficient cover.

Hover over a flagged row to see a tooltip with the specific warning or error description. The HGL Cvr and Comply cells also tint/color independently based on their own pass/fail state (see Compliance Checking).

Alignment Grouping

Results are grouped by alignment name. Each alignment appears as a collapsible header row in the grid. Click the header to expand or collapse the pipes in that alignment. This keeps large networks organized and makes it easy to focus on one run of pipes at a time.

Editing Cells

The Pipe name, Shape, Span (box only), Size, Mannings n / Hazen-Williams C, Slope %, Inv_DS, Inv_US, and Q columns are editable directly in the grid, Excel-style.

Box Span Editing

Setting a pipe's Shape to Box enables the Span column for that row and switches the Size cell's editor to a typed rise (inside height, ft) instead of a diameter dropdown. On Apply, HydraStorm swaps the pipe to the nearest matching box part family and size in the Civil 3D parts list. In the property panel, a box pipe's Diameter field mirrors its Width/Span value.

Type-to-Edit

With an editable cell current (selected but not yet in edit mode), just start typing — the cell enters edit mode immediately and replaces its contents with the typed character. F2 and double-click still work if you'd rather edit the existing value in place. The Size and Shape cells use their dropdown editors instead, so typing doesn't apply there. Read-only rows — boundary rows (other than HGL_DS) and merged splice-stub rows — don't respond to typing or F2.

Invalid-Input Feedback

If an edit is rejected — a non-numeric value, a duplicate pipe name, or a boundary HGL below the downstream invert — the cell flashes red, the status bar shows the reason, and the cell stays in edit mode so you can correct it immediately. Press Esc to abandon the edit and revert to the previous value.

HGL Override

The HGL_DS column is editable for outfall pipes or any pipe where you want to manually set a downstream boundary condition. Click the cell, type a new elevation value, and press Enter. The HGL calculation will propagate upstream from your overridden value.

To clear a manual HGL override and revert to the calculated value, right-click the pipe row and select Reset HGL to Calculated. The downstream boundary condition will be recalculated using the project's default method (normal depth, user-specified elevation, or (D_c + D) / 2).

Selection

Click a row in the results table to select that pipe. Selection is synchronized across all three panels:

• The pipe is highlighted in the profile view.
• Its properties appear in the property panel.
• The row is highlighted in the results table.

You can select multiple contiguous rows by holding Shift and clicking. Multi-selection enables batch geometry editing in the property panel, such as the Raise/Lower and Multi-Match operations.