North Peoria Area Drainage Master Plan - Flood Control District of ...

Economic CriterionThe evaluation of the economic criterion isbased on the effectiveness of each alternativein satisfying two elements: ImplementationCost and Maintenance Cost.Implementation Cost. This element representsthe estimated cost of the proposed alternativeto the public, either through increased developmentcosts passed on to future residents ofthe area who will directly benefit from theimprovements (local public) or the costs to thegeneral public. The cost for a structural alternativeconsiders the cost of the structuralimprovements necessary to implement theproposed alternative (a positive cost), thevalue of land that is reclaimed from the floodplain/erosionhazard zone by the structuralimprovements (a negative cost, i.e., benefit).Added together, these costs represent the totalnet cost of the alternative. The effectiveness ofa given alternative is measured by using thetotal net cost. The lower the net cost thehigher the rating for the Economic Criterion.Maintenance Cost. This element accounts forthe potential maintenance costs associatedwith the structural components of an alternative.It has been assumed that such costs areproportional to the length of bank protectionproposed for a given alternative. The greaterthe bank protection length, the higher thepotential maintenance cost and the lower therating.SUMMARY OF EVALUATION RESULTSFlood control management alternatives weredeveloped for watercourses in the MorganCity Area, Big Spring Area, and Twin Buttesarea. Table 2 lists the watercourse evaluatedwithin the specific planning areas. The watercourseswithin a planning area have similarphysical and hydraulic characteristics andtherefore are evaluated collectively. Results ofthe evaluation are applied to all watercoursesin a specific planning area. Scoring results, forwatercourse management alternatives, forplanning areas are listed in Table 3.Stormwater storage flood control managementalternatives were developed and evaluatedfor the Big Spring Area with the intentthat the results are applied to other planningareas that have characteristics such that thestandard practice of retaining the 100-year, 2-Table 2Watercourses EvaluatedPlanning AreaMorgan CityWatercourseMorgan City WashBig Spring Unnamed Wash 1Unnamed Wash 2Unnamed Wash 3Twin ButtesCaterpillar Tank WashTwin Buttes WashEast Garambullo WashWest Garambullo WashWhite Peak WashWest Fork of White Peak Wash17