Arroyo Seco Canyon Project
Conceptual Design Report
Figures and Tables

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Figure ES.1 Location of Existing Facilities and Overview of Project Areas

Figure ES.2 Comparison of Diversion Volumes and Impacts of Proposed.

Table ES.1 Summary of Estimated Total Project Cost

Figure 1.1 Location of Existing Facilities and Overview of Project Areas

Figure 2.1 - Devil's Gate Watershed

Table 2.1 Hydrologic Analysis of Flood Events

Table 2.2 Historic Water Volumes at the Arroyo Seco Diversion Structure

Table 2.3 Summary of 5-year Storm Hydraulic Analysis Results

Figure 2.2 Floodplain Boundaries and Hydraulic Analysis Cross Sections

Figure 2.3 Arroyo Seco stream downstream of the Diversion Structure viewed

Figure 2.3 Arroyo Seco stream downstream of the Diversion Structure viewed

Figure 2.4 Arroyo Seco stream downstream of the Diversion Structure viewed

Figure 2.5 Upstream of the Headworks Structure

Figure 5.3 - Headworks Restoration Area

Figure 5.4 Headworks Restoration Area Cross Section

Figure 5.7 Willow poles evolution at Las Virgenes Creek, Calabasas, California

Figure 5.8 Well placed floodplain islands are naturally vegetated

Figure 6.8 Site 2 topography

Figure 6.9 Dam Topography

Figure 7.1 Hydrologic analysis at the diversion structure

Figure 7.2 Hydrologic analysis of existing spreading basins

Figure 7.6 Area 3 Conceptual Retrofit Overview Plan

Figure 7.7 Area 3 Conceptual Retrofit Detailed Plan

Figure ES.1 Location of Existing Facilities and Overview of Project Areas

Figure ES.2 Comparison of Diversion Volumes and Impacts of Proposed

Figures 6.4 and 6.5 Dam Alternative

Table 2.1 Hydrologic Analysis of Flood Events

Table 2.2 Historic Water Volumes at the Arroyo Seco Diversion Structure

Table 2.3 Summary of 5-year Storm Hydraulic Analysis Results

Table 5.1 Qualitative Comparison of Restroom Options

Table 5.2 Restroom Facility Cost Comparison

Table 5.3 Preliminary Evaluation of Restroom Options

Table 5.4 Preliminary Cost Estimate Summary for Area 1

Table 6.1 Preliminary Comparison of Diversion Alternatives

Table 6.2 Preliminary Cost Estimate Summary for Area 2

Table 7.1 Existing Spreading Basin Capacity Analysis

Table 7.2 Summary of New Spreading Basin Geometric Properties – Alternative 1

Table 7.6 Summary of Additional Captured Water Unit Costs.

Table 7.7 Mechanisms that Affect Groundwater Recharge Basins

Table ES.1 Summary of Estimated Total Project Cost