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<br />JAN 23 '98 02:22PM PLNG DIV OMAHA DIST ACOE <br /> <br />P.3/6 <br /> <br />, <br /> <br />-. <br /> <br />Appendix B <br /> <br />Using Dry Creek Costs as an Estimating Tool <br /> <br />General <br />The purpose of this repon was to document the adminisrntive proceduteS dlat were sw:c;essfully used for the Dry <br />Creek flood proofing project. Those pr<<edures. and die geneml pbilosophy of maximizing homeowner involvement, <br />are probably va1id for all holl5ll nising projects: however, the COSIS are project specifiC and have not been tested for <br />application elsewhere. The purpose of dlis appendill is to discuss the applicability of using lhe cost data included <br />herein as a basis for estimating eosts on similar projects at other locations. <br /> <br />Discussion <br />As discussed in this (epoR. tho homes on Dry Creek were SlIUCtlllBlly sound, brick veneer, one-slOry homes with <br />crawl spaces. lbe homes ranged from 1,000 to 1,475 square feeL Building materials and skilled labor were readily <br />available, and there was a competitive environment wilhin the local conrnclOr community. This does not mean that <br />the Dry Creek COSIS !R DOC represeoWive, it means that extraeting COSt data from this project for use elsewhere <br />should be done \II11b caution and wilb an understandlng of the applicability of such ccist dala. <br /> <br />A num tier of faclOrS impact the cost of flood proofing a home, some include: size of SlnIcture, height of raise, condi- <br />tioil of the home. number of enaances, size of porehes, fuepJaces, type of COIISltUCtion (brick veneer VI. frame), <br />access, adclitions or offsets, and others. For homes in fair condition or better (no serious struCtutal. cleficJencies), the <br />dominant faclOrS IIRl usually the siu of the home and Ibe llllse height. Afltlr the Dry Creek flood proofmg project was <br />completed, the cost dam was evaluated to see if any meaningful relationships could be derived that might be used as a <br />p1anning-Ievd estimatini rool. An equation was developed based on the Dry Creek bouse raising costs. The variables <br />in the equation are size of SllUCture and raise height, and the equation takes lhe fonn: <br /> <br />COMPUTED COST = K + (K,)(slu) + (KJ(ralse heiCht). Constants are Ki K.. "size" is tire sqUl:JTefeel ofr"" <br />groundjlDDr, including aI/ached garage; and Kia . "ni3e ""ighl" is infeel. <br /> <br />The conslants derived from the Dry Creek data are: <br />K=U,36"O ; K...U.6; and ~=970. <br /> <br />The following Cost Analysis Table shows the actual cost, the computed cost using Ibis formula, and the percent of <br />difference for each house raised in lI1e Dry Creek ProjccL <br /> <br />The above equalion should givo reasonable planning-Ievol estimates for screening alternatives. Anyone using the <br />equation or irs resulrs should recognize the limiwions of this method. <br /> <br />THE EQUATION SHOULD NOT BE APPLIED TO SITUATIONS WHICH ARE DRASTICALLY DIFFERENT <br />FROM THOSE AT DRY CREEK. SPECIFICALLY, THE EQUATION SHOULD NOT BE USED ON HOMES <br />IN POOR (UNSOUND) CONDmON OR HOMES ON SLAB. <br /> <br />B.I <br /> <br />- <br />