Linear Site Improvement with Cross-sectional Area Options

Linear site improvements with cross-sectional area are represented by closed linear shapes (areas with length and a constant width and depth) from which cross-sectional area can be calculated. Curbs are an example of a linear site improvement with a cross-sectional area. In general, site improvements of this nature are those for which both the area of each instance of the site improvement and the total area of all instances are reported in the Takeoff Report. The cost of the cumulative total is also calculated, if you provide unit cost data for each individual instance of the site improvement.

Note: In bidding on curb construction, contractors commonly employ a unit price per linear foot or meter of curb. Engineers, rely on unit prices such as those in producing cost estimates for the owner. In addition, when ordering the materials to be purchased, delivered, handled, and used in making a concrete curb, the contractor needs to know how many cubic yards or cubic meters of concrete to order, and to understand at what rate he needs to schedule its delivery. The later depends on the cross-sectional area of the particular curb being formed and the resulting volume per linear foot, since the rate of extrusion is fairly unaffected by the curb’s cross-sectional shape.


Options
Name	Type a descriptive name for the site improvement as you want it to appear in the Assign Site Improvement dialog and Takeoff Report.
Measurement unit	Select the appropriate linear units, depending on whether you will purchase and build the improvement in English or metric lengths. Note: The units of measure that you specify overrides the corresponding setting in the Units section of Project Settings.
Material procurement unit cost	This displays the total of the procurement unit cost of the man-made material (per linear unit) multiplied by the cross-sectional area (per area unit). Note: This program displays the currency symbol and format that you have set in Microsoft Windows^® Regional and Language Options. The units and calculations, however, are not associated with a specific currency, so if a project is opened on a computer with different regional settings, those currency symbol and formats are used, but no conversion between currencies has been made.
Installation price	Enter the cost (per linear unit) that you will charge the customer to furnish, install, or otherwise construct every aspect of the site improvement, including all labor costs, profit, and other incidental costs that you expect to pay to have the site improvement constructed.
Bid unit price	This displays the material procurement unit cost plus the installation price for each instance of the site improvement. This total, which can be reported in the Takeoff Report, is the cumulative price that you intend to include in your bid for the job. Note: Site improvements of this type commonly represent curbing and sidewalks of a constant width and thickness, both of which may be measured and paid for by length. In each case, the Takeoff Report reports the computed length of the site improvement, its bid unit price, and the resulting bid price for that type of improvement. Additionally, the procurement cost for the related material is reported, if the procurement cost can be calculated by volume. The related area measurement unit is not reflected in the bid price, but only in the procurement price of the material with which the site improvement is to be constructed.
Cross-sectional area	Enter the area of a cross-sectional slice of the improvement per area unit. Then select the corresponding unit of measure.
Material	Select the area-based material that will be used to construct the site improvement.
Quantification basis	Planimetric length - Select this if the site improvement's path is relatively flat, such as for a curb line. The Plan View's (planimetric) length for the site improvement is calculated and will be reported in the Takeoff Report. Slope length - Select this if the actual slope length of the site improvement is important, such as for a drainage channel. The slope length of the site improvement will be reported in the Takeoff Report.