Orestimba Creek Feasibility Study - Stanislaus County

Economics Appendix – Draft Report - Orestimba Creek Feasibility Study, Stanislaus County, California – September 2012
furniture rentals, etc). Due to the relatively shallow alluvial fan type flooding seen from the
Orestimba Creek, annual damages for emergency costs were very minimal.
Damage
Category
Table 4-5: Emergency Costs Depth-Damage Curves
Depth in Feet
-1 0 0.5 1 1.5 2 3 4 5 6 7 8 9 10
% Damage to Structure/Content
SFR1 0 17 28 38 49 57 74 89 100 100 100 100 100 100
SFR2 0 0 15 21 28 34 45 55 66 77 85 94 100 100
MFR1 0 17 28 38 49 57 74 89 100 100 100 100 100 100
MFR2 0 0 15 21 28 34 45 55 66 77 85 94 100 100
Mobile Home 0 0 81 85 85 87 100 100 100 100 100 100 100 100
Cleanup Costs
Cleanup Costs mainly include costs associated with cleanup of debris resulting from flooding.
Cleanup costs were derived using structure values and a depth damage curve used in other Corps
studies, such as the Yuba General Re-evaluation Report, (normal distribution and 8% standard
deviation). The cleanup costs depth damage curve is shown below in Table 4-6. Similar to
emergency costs, because of the shallow flooding that we see with the Orestimba Creek, cleanup
costs turn out to be minimal.
Damage
Category
Table 4-6: Cleanup Cost Depth-Damage Curve
Depth in Feet
-1 0 0.5 1 1.5 2 3 4 5 6 7 8 9 10
% Damage for Cleanup
Cleanup 1.00 1.50 1.75 2.00 2.25 2.50 3.00 3.00 3.00 3.00 3.00 3.00 3.00 3.00
For all three of these categories, elevation uncertainty was the same 0.5 feet as used in structure
analysis.
Agricultural Damages
Agricultural Damages were estimated by event in a model outside of HEC-FDA. These event
damages were then input into HEC-FDA in order to estimate EAD. For a more detailed writeup
of this analysis and the assumptions used, please refer to Attachment B of this appendix.
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