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Task 1.2 Identification of Existing Initial Needs Assessment <br />RBF will prepare a qualitative assessment of the drainage constraints and conditions based upon existing data of <br />the watershed and historical flooding problems for this area. Existing conditions and current design criteria will be <br />evaluated to formulate initial assessment of the drainage needs. RBF will identify and summarize critical drainage <br />related problems, including existing flood hazard zones and published floodplain and will identify existing physical <br />or regulatory constraints based upon the baseline information researched for the watershed. <br />Deliverables: <br />1. Need Assessment Memo <br />Task 1.3 Establish Engineering Design Criteria <br />RBF will provide preliminary engineering services to establish the design criteria for hydraulic and hydrologic <br />design requirements prior to initiating the preliminary design process. The necessary planning criteria and <br />standards will be established to ensure that the required level of flood protection is provided to meet the various <br />jurisdictional agency requirements, and are in conformance with the City's criteria. This work item will include <br />establishment of the following critical design features: <br />¦ Hydraulic controls <br />¦ Street inlet requirements <br />¦ Outlet requirements <br />¦ Local drainage system hydraulic modeling <br />¦ Review of master plan design assumptions <br />¦ Distribution of flows to the proposed storm drain and street section <br />¦ Critical design water surfaces (committed elevations) <br />¦ Allowable street flooding and storage <br />¦ Deficiency upgrade requirements <br />¦ Allowable design deviations (i.e., min. Flood protection levels) <br />A memo summarizing the recommended design criteria and guidelines will be prepared for review. This document <br />will serve as a reference framework to base decisions as work progresses and unique opportunities are <br />encountered. <br />Deliverables: <br />1. Design Critieria Memo <br />Task 1.4 Field Facility Inventory <br />RBF will perform an "above-ground" field review and inspection of the main existing storm drain facilities. This <br />inventory will include the facilities that have been constructed since the previous storm drain masterplan (1994) <br />and GIS mapping and the existing facilities on the index map. The investigation will provide verification of the <br />facility information in comparison to the plan data, and augment data gaps where possible. The inspection will <br />include limited field measurements, if possible, for depth of pipe, pipe size, and pipe condition (if visible). Field <br />inventory information will be recorded and provided to the City for inclusion into the City database. Task excludes <br />field survey of existing facilities constructed since 1994. <br />Deliverables: <br />1. GIS database updated with new storm drain data (completed since 1994) <br />22 <br />20C-23 <br />2. Field reconnaissance photo log <br />3. Documentation of County downstream water surface elevations