Orestimba Creek Feasibility Study - Stanislaus County

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Economics Appendix – Draft Report - Orestimba Creek Feasibility Study, Stanislaus County, California – September 2012 2.0 Flood Plain Area and Inventory 2.1 Economic Impact Areas For economic evaluation and project performance purposes, the study area was divided into two economic impact areas. Delineation was made to address differences in economic conditions and inventory type within the floodplain. A map showing the two impact areas (Rural and Urban) is shown in Figure 2-1. Figure 2-1: Orestimba Creek Economic Impact Areas 4
Economics Appendix – Draft Report - Orestimba Creek Feasibility Study, Stanislaus County, California – September 2012 2.2 Inventory of Structures and Property in Study Area A structural inventory was completed based on data gathered from assessor’s parcel data and onsite inspection of structures within the flood plain. Structures were determined to be within the economic study area by using Geographical Information Systems (GIS) to compare the 0.2% (1/500) ACE flood plain boundary (plus a buffer) with the spatially referenced assessor parcel numbers (APN). Information from the assessor’s parcel database (such as land use, building square footage, address) was supplemented during field visitation for each parcel within the flood plain by adding fields for foundation height, specific business activity (non-residential), building condition, type of construction, and number of units for example. Windshield survey field observation conducted on 100% of non-residential structures within 0.2% (1/500) ACE floodplain. Residential structures were sampled and grouped geographically by areas of homogeneous characteristics. Where square footage data was not available, the Google Earth measuring tool was used to estimate square footage. Parcels with structures, were categorized by land use and grouped into the following structural damage categories: 1) Single Family Residential – includes all parcels represented by a single unit such as detached single family homes, individually owned condominiums and townhouses. 2) Multiple Family Residential – includes residential parcels with more than one unit such as apartment complexes, duplexes and quadplex units. Each parcel may have multiple structures. 3) Commercial – includes retail, office buildings, restaurants 4) Industrial – includes warehouses, light and heavy manufacturing facilities. 5) Public – includes both public and semi-public uses such as post office, fire dept, government buildings, schools and churches. 6) Agriculture – Agricultural inventory was developed in a separate analysis. Please see Attachment B for a detailed writeup of this analysis. All parcels with structures were assigned to one of the listed categories. Some parcels have more than one physical structure and some structures, such as condominiums, are represented by multiple parcels. Table 2-1 displays the total number of structures within the 0.2% (1/500) ACE floodplain by category. Single family and Multi-family have been grouped together as “Residential” for presentation purposes. Table 2-1: Structural Inventory Number of Units within the 0.2% (1/500) Annual Chance Floodplain by Land Use Economic Impact Area Residential Commercial Industrial Public Total Rural 158 0 0 0 158 Urban 1122 62 16 7 1207 TOTAL 1,280 62 16 7 1365 5
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Orestimba Creek Feasibility Study - Stanislaus County

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