Orestimba Creek Feasibility Study - Stanislaus County

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Economics Appendix – Draft Report - Orestimba Creek Feasibility Study, Stanislaus County, California – September 2012 List of Figures Figure 2-1: Orestimba Creek Economic Impact Areas ............................................... 4 Figure 2-2: Orestimba Creek Existing Condition Floodplain - 10% (1/10) Annual Chance Event ............................................................................................................. 7 Figure 2-3: Orestimba Creek Existing Condition Floodplain – 0.2% (1/500) Annual Chance Event ............................................................................................................. 8 Figure 5-1: Uncertainty in Discharge, Stage and Damage ........................................ 22 Figure 5-2: Index Locations (For Reporting and Sensitivity Runs) ......................... 28 Figure 6-1: Location of the Chevron Levee and Channel Modifications ................ 34 vi
Economics Appendix – Draft Report - Orestimba Creek Feasibility Study, Stanislaus County, California – September 2012 1.0 Introduction 1.1 Purpose and Scope The purpose of this report is to present the results of the economic analysis performed for the Feasibility Study of the Orestimba Creek Project. The report documents the existing condition within the study area and proposed alternative plans to improve flood risk management, and designate the National Economic Development (NED) Plan for purposes of estimating federal interest for Orestimba Creek. The report presents findings related to flood risk, potential flood damages and potential flood damage reduction benefits. 1.2 Study Area The study area is located in the southwestern portion of Stanislaus County, in what is referred to as the Newman Division by the U.S. Census Bureau (see, Figure 1). Orestimba Creek stretches approximately 7.5 within the study after having left the foothills of the Diablo Mountain Range. It is estimated that in the 500-year flood event the floodplain would encompass approximately 20,000 acres, including the City of Newman (see Figure 2-1). The City of Newman is the home of approximately 12,321 residents (2010 Census data). Newman is home to the world’s first school bus company and along with the surrounding area, it is home to some of California’s most efficient and important agricultural industries. Tomato and vegetable processing, cheese manufacturing, and turkey hatching are examples of some of the agricultural industries located in the area. The area is acknowledged for crop diversity and productivity, which can be accredited to a combination of exceptional factors such as, soil quality, air quality, climate, and water supply. 1.3 History of Flooding The city of Newman has experienced 14 floods in the past 58 years (1954, 1955, 1957-1959, 1963, 1968, 1969, 1978, 1980, 1983, 1986, 1995 and 1998). The major floods occurred in 6 out of the last 14 flooding events (1955, 1958, 1963, 1980, 1983, 1995 and 1998). These floods occurred along Orestimba Creek and affected both rural and urban land uses. The frequency of flooding in and around Newman is similar that which occurs on an average cycle of between 4 to 5 years. These flooding events have affected the same general areas each time except when there was a levee failure or similar occurrence that changed the location of flooding and the type of land uses that were adversely affected. The following flooding summary descriptions focus on the seven largest major flooding events. In 1955, floodwaters inundated agricultural, residential, and commercial properties; caused breaks in the DMC; washed out public streets and culverts; inundated and closed public streets in many areas; and washed out the Southern Pacific Railroad ballast and ties. The April 1958 flood damaged agricultural lands and public facilities in the Orestimba Creek basin. Some residents were forced to evacuate their homes. Subsequently, in the 1959 flood, 1
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Orestimba Creek Feasibility Study - Stanislaus County

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