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<br />25 <br /> <br />, <br /> <br />Step 2 -- Calculate special benefit portion of project (BS)' <br />The special benefit portion of the project is the reduction in liability <br />for development-induced impacts. It is the AADR measured from ultimate <br />development without new drainage facilities to the existing conditions. <br />It is the area in Figure 111-2 between the U1 and the E1 curves. <br />In Chapter II of this report the writers stated that both the <br />municipality and the developer were responsible for increased damages <br />due to new developments. This implies that the AADR from curve U1 to <br />curve E1 is a benefit to both. and each should contribute in proportion <br />to that benefit. The writers feel that the municipal government is con- <br />tributing its portion of this benefit by implementing and administering <br />the drainage management program. That is. the municipal government's <br />responsib1ity is taking positive management actions to mitigate develop- <br />ment-induced drainage impacts. For this reason. the entire area between <br />curve U1 and curve E1 is assigned as special benefit to be allocated <br />among developers. <br />Step 3 -- Calculate general benefit (BG). <br />There are two elements of the general benefit. The first is the <br />reduction in liability that the community has incurred through past <br />actions of its elected officials. This element is the AADR from existing <br />conditions to the conditions that existed when the municipal government <br />began exercising authority over land development. This latter condition <br />might be difficult to ascertain and the writers suggest that a practical <br />substitute for it is the existing conditions with the new drainage <br />facilities. The AADR measured from curve E1 to E2 in Figure 111-2 <br />reasonably establishes the portion of the new facility that reduces <br />municipal responsibility. <br />