APPENDIX F 

 ENGINEERING PROGRAM DESCRIPTION 



Individual projects are designed using che interactive 

 computer prograrns developed by the DNRC for Missouri 

 River water reservation applications. This method incorpo- 

 rates computer-aided design (AutoCAD) and spreadsheet 

 (Locus- 1 23) software to design and calculate annual irriga- 

 tion costs of potential irrigation sites. 



With AutoCAD a user can draws points, lines, geomet- 

 ric objects, and freehand traces. These drawing components 

 are referred to as entities. Using a digitizing tablet and a 

 printer or plotter these entities are drafted and reproduced 

 on a map at any desired scale. A digitizing tablet is a com- 

 puter input device, like the keyboard, that allows the user to 

 place information on the screen. A map is placed on the 

 digitizing tablet and the tablet is calibrated to che map'sscale. 

 Then the user draws encicies on che screen ac a scale relative 

 to che map. This procedure is used in che design of irrigacion 

 syscems. Text and attribute information is entered to com- 

 plete a drawi ng. An attribute is informadon that is associated 

 with a drawing entity and is used to index and keep track of 

 graphic drawings in che design. These drawing encicies and 

 cheir attributes are referred to as blocks. 



To design an irrigation system a base map of the design 

 area is calibraced co the tablet and irrigation system design 

 information is entered by the designer. The AutoCAD LISP 

 programs arc design tcx)ls that will perform calculations and 

 insert standard symbols at che designer's discrecion. These 

 programs are not 'intelligent'; they do not make design 

 decisions. They do, however, make the design pr(x:ess easer, 

 quicker, and moreaccurate. When the design is finished, the 

 attribute information is transfered to a spreadsheet that 

 performs the economic analysis and formats che informa- 

 don CO be used in a report. 



The irrigadon design analysis (IDA) spreadsheet takes 

 information that has been extracted for AutoCAD irriga- 

 don designs and determines the total, annual, and annual 

 per acre costs of chat system. TTie spreadsheet uses a key- 

 board macro to import the information from AutoCAD 

 and insert the informadon into the appropriate locadons in 

 the spreadsheet. The identification (ID) range of the IDA 

 spreadsheet imporcs AutoCAD design data on project 



number, owner name, legal land description, and designer's 

 name. The ID range is used as a project identifier for all 

 output. Other project data is imported co che system vari- 

 able range of the IDA spreadsheet including; peak con- 

 sumptive use , total consumptive use, net irrigation require- 

 ment, maximum soil intake rate, soil water holding capacity, 

 and miles of required power line construction. I his infor- 

 mation is used to document che variables used in the 

 AucoCAD design process and is used by che spreadsheec co 

 calculate other variables. 



The irrigation attribute range imports AutoCAD de- 

 sign data and determines che volume of wacer needed and 

 che syscem cose for each irrigation attributes in the 

 AutoCAD design. It then totals the number of acres irri- 

 gated, flow required, labor required, acre feet of water 

 needed, andsystem costs forallchesystems in the AutoCAD 



design. 



The distribution system attributes range import data 

 from the pipeline attribute blocks of the AutoCAD design. 

 This range determine che class and per foot cost of the 

 pipeline at each node and then calculates che cocal cose of che 

 pipeline for each reach. The per foot cost of the pi pe is found 

 by searching the pipe cast table for the appropriate size and 

 class of pipe. The range then calculates the cocal pipe line 

 costs. 



The pump attributes range imports data for the pump 

 attribute informarion.The range calculates the diesel engine 

 cost chat would be required co drive each pump. These costs 

 are compared to electrical motor costs and power line con- 

 struction costs in thesystem variables range to decermi ne che 

 least cost pumping alternative. 



Thesystem constants range sets the value for thespread- 

 sheet variables that are not dependent on the AutoCAD 

 design and so remain constant from one design to che nexc. 



The system variables range is the set of variables that is 

 obtained from or calculated from the AutoCAD design and 

 so change with che design. This sec of variables is included 

 in che princ ouc of each design summary. The equipment 



51 



