Common use of Drainage Analysis Clause in Contracts

Drainage Analysis. The Engineer will perform a drainage impact analysis utilizing HCED criteria and HCFCD PCPM for improvements to ▇▇▇▇▇ Street from the dead end to Grant Road. The following tasks will be performed and included in the drainage study report: a. Obtain, review and evaluate available data for the project area including existing public and private utility information relevant to the existing drainage systems and outfall drainage channels/systems for the project area. The Engineer will obtain and review the reported findings of all available previous drainage studies related to the project area or vicinity. b. Perform field visits to the project area and vicinity to document existing conditions and special concerns including existing ditch, culvert, and overland flow information using LiDAR and collected survey data. In addition, the location of high points in the roadway and ditches shall be determined from the BMP during the field visits. c. Perform Existing Conditions Drainage Analysis including analyzing LiDAR data to determine existing overland sheet flow patterns, identify and locate existing outfalls and drainage systems. d. Determine Existing Conditions drainage areas based on the desired ROW and outside contributing areas and create drainage area maps. e. Perform existing condition hydrologic calculations (2-, 10-, and 100-year rainfall events) based upon NOAA Atlas 14 rainfall data and HCED and HCFCD PCPM drainage criteria for roadways. We will utilize XPSWMM software to perform the analysis. f. Analyze conveyance capacity of existing condition roadside ditches, culverts and contributing storm sewer systems to the outfall on Grant Road g. Perform Proposed Conditions Drainage Analysis to include proposed conditions drainage map, proposed conditions hydrologic calculations utilizing Atlas 14 rainfall data, comparison between existing and proposed condition hydraulics for 2-, 10-, and 100-year flow events, develop two (2) proposed drainage conveyance alternatives such as storm sewers, roadside ditches or a combination of both. We will utilize XPSWMM software to perform the analysis. h. Engineer will provide HCED with exhibits illustrating the various drainage alternatives and corresponding inundation maps, along with a summary table of those options, associated costs and metrics indicating reduction in flood risk to structures as well as roadway. HCED will review and approve the submittal prior to scheduling the pre-drainage and drainage meeting. i. Develop measures to mitigate increases in water surface elevations and/or flow associated with the proposed roadway and drainage improvement project, due to impacts from changes in impervious cover, routing of offsite flows and impacts to receiving storm sewer system along Grant Road. j. Drainage Coordination

Drainage Analysis. The Engineer Design-Build Firm shall be responsible for designing the drainage and stormwater management systems. All design work shall be in compliance with the Florida Administrative Code, chapter 14-86; Federal Aid Policy Guide 23 CFR 650A; Pinellas County Public Works, Pinellas County Code of Ordinances and the requirements of the regulatory agencies. This work will perform include the engineering analysis necessary to design any or all of the following: cross drains, French drains, roadway ditches, outfall ditches, storm sewers, retention/detention facilities, and water management, other drainage systems and elements of systems as required for a drainage impact analysis utilizing HCED criteria complete analysis. Full coordination with all permitting agencies, the County’s Environmental Management section and HCFCD PCPM for improvements to ▇▇▇▇▇ Street Drainage Design section will be required from the dead end to Grant Roadoutset. The following tasks will Full documentation of all meetings and decisions shall be performed and included in the Drainage Design Documentation. These activities and submittals should be coordinated through the County’s Project Manager. The exact number of drainage study reportbasins, outfalls, cross drains and water management facilities (retention/detention areas, weirs, etc.), floodplain compensation sites and Impaired Water Body and Outstanding Florida Waters designations shall be the Design-Build Firm’s responsibility. The objective is to obtain an approved stormwater design that addresses water quality treatment, water quantity attenuation, floodplain impacts and conveyance systems. These services shall include, but are not limited to the following: a. Obtain, review A. The Design-Build Firm shall be completely familiar with all existing permits along the trail alignment that affect the project. The Design-Build Firm shall strive to avoid impacts to permitted water management facilities and evaluate available data floodplains along the project corridor. Impacts to water management facilities and floodplains that cannot be avoided must be minimized and compensated for by the Design-Build Firm within the right- of-way identified for the project area including existing public and private utility information relevant to the existing drainage systems and outfall drainage channels/systems for proposed trail. If all or portions of the project area. The Engineer will meet permit agency exemption requirements, the Design-Build Firm shall obtain written letters confirming the exemptions. B. All impacts and review the reported findings replacement of all available previous drainage studies related to existing floodplains and historical basin storage within ditches and low depression areas along the project area or vicinity. b. Perform field visits to the project area and vicinity to document existing conditions and special concerns including existing ditch, culvert, and overland flow information using LiDAR and collected survey data. In addition, the location of high points in the roadway and ditches shall be determined from the BMP during the field visitsand documented. The proposed design shall document no increase in high water elevations (3-year thru 100-year) and shall be in compliance with Pinellas County’s Floodplain Management Ordinance. c. Perform Existing Conditions Drainage Analysis including analyzing LiDAR data C. The Design-Build Firm shall be familiar with all drainage and flooding issues along the project. This includes but is not limited to, reviewing flooding investigations, coordination with County maintenance and engineering forces and reviewing adjacent permits to determine the project. The Design-Build Firm shall provide design that does not aggravate existing overland sheet flow patterns, identify and locate existing outfalls and drainage systemsor create new flooding issues along the project. d. Determine Existing Conditions drainage areas based on the desired ROW D. The Design-Build Firm shall evaluate and outside contributing areas and create drainage area maps. e. Perform existing condition hydrologic calculations (2-, 10-, and 100-year rainfall events) based upon NOAA Atlas 14 rainfall data and HCED and HCFCD PCPM drainage criteria for roadways. We will utilize XPSWMM software to perform the analysis. f. Analyze conveyance capacity of existing condition roadside ditches, culverts and contributing storm sewer systems to the outfall on Grant Road g. Perform Proposed Conditions Drainage Analysis to include proposed conditions drainage map, proposed conditions hydrologic calculations utilizing Atlas 14 rainfall data, comparison between existing and proposed condition hydraulics for 2-, 10-, and 100-year flow events, develop two (2) proposed drainage conveyance alternatives such as storm sewers, roadside ditches or a combination of both. We will utilize XPSWMM software to perform the analysis. h. Engineer will provide HCED with exhibits illustrating the various drainage alternatives and corresponding inundation maps, along with a summary table of those options, associated costs and metrics indicating reduction in flood risk to structures as well as roadway. HCED will review and approve the submittal prior to scheduling the pre-drainage and drainage meeting. i. Develop measures to mitigate increases in water surface elevations and/or flow associated with document the proposed roadway and drainage improvement projectbase clearance above the seasonal high groundwater table in setting the proposed profile of the trail. The minimum clearance for the trail base course above the base clearance water elevation shall be 1-foot following the FDOT 2018- 2019 Design Manual (former PPM Volume I, due to impacts from changes in impervious cover, routing of offsite flows and impacts to receiving storm sewer system along Grant RoadTable 2.6.3). j. Drainage Coordination

Drainage Analysis. A. The Engineer ENGINEER will perform be responsible for designing a drainage impact and stormwater management system for the project. The design work will comply with local and state requirements. This work will include the engineering analysis utilizing HCED criteria necessary to design the following: cross drains, roadway ditches, outfall ditches, and HCFCD PCPM drainage pipes. B. The ENGINEER will design a piping conveyance system that meets the requirements of the Marion County LDC and takes into consideration an agreed upon design storm event and accounts for improvements normal drainage parameters such as conveyance capacity, velocity, and pavement gutter spread. C. The ENGINEER will provide the COUNTY and applicable permitting agencies with electronic PDFs of the digitally signed and sealed Drainage Conveyance Design Report. This will include final calculations for the proposed storm drainage system and information required for permit review and approval. D. The scope of work of this Agreement also does not include modification of flood insurance rate maps through FEMA. The current FEMA Flood Insurance Rate Map for the Project area, dated 08/28/2008, does not delineate any regulated flood zones within the Project limits. E. The ENGINEER will retain GDC as a subconsultant to ▇▇▇▇▇ Street perform design and associated permitting for the proposed drainage retention areas (DRAs). GDC will provide the following services as part of this task. 1. The design of drainage retention areas will be based on the PER. This Agreement does not include a pond siting analysis. This task involves the design and analysis for up to four (4) drainage retention areas. Analysis will be based on either the SCS Curve Number or the Green-Ampt method. 2. Accepted deviations from the dead end Marion County Land Development Code for roadway projects will be considered in the design of drainage retention areas if applicable to Grant Roadenhance safety or cost efficiency. Deviations, if necessary, will be coordinated with the COUNTY during the design phase. 3. The design and analysis of drainage retention areas for this project will include stormwater management for the roadway right-of-way, permanent easements, and drainage retention areas. Resolution of flooding problems outside of the project limits is outside the scope of this Agreement. 4. The following tasks is a list of DRAs as part of this Agreement: o Basin 3 DRA, located within the City of Ocala Sportsplex. o Basin 4 DRA, located adjacent to the right-of-way for SW 38th/40th Street. This is a shared use DRA. DRAFT o Basin 5 is currently routed to the DRA for Basin 4. The addition of a DRA to exclusively serve basin 5 is not included in this Agreement. o Basin 6 DRA is located at the north and east of the curve in the road. o Basin 7 DRA is located within parcels purchased by Marion County at the southwest corner of the intersection of SW 38th /40th Street and SW 43rd Court. 5. The ENGINEER will provide the COUNTY and applicable permitting agencies with electronic PDFs of the digitally signed and sealed Drainage Design Reports for the Analysis of DRAs. This will include final calculations for the proposed storm drainage system, final pond calculations, and information required for permit review and approval. 6. Recently, the State of Florida adopted new stormwater rules under Chapter 2024-275, Senate Bill 7040 on June 28, 2024. The new rule takes effect 18 months after adoption. We assume that this Project will be performed designed and included in the drainage study report: a. Obtain, review and evaluate available data for the project area including existing public and private utility information relevant to the existing drainage systems and outfall drainage channels/systems for the project area. The Engineer will obtain and review the reported findings of all available previous drainage studies related to the project area or vicinity. b. Perform field visits to the project area and vicinity to document existing conditions and special concerns including existing ditch, culvert, and overland flow information using LiDAR and collected survey data. In addition, the location of high points in the roadway and ditches shall be determined from the BMP during the field visits. c. Perform Existing Conditions Drainage Analysis including analyzing LiDAR data to determine existing overland sheet flow patterns, identify and locate existing outfalls and drainage systems. d. Determine Existing Conditions drainage areas based on the desired ROW and outside contributing areas and create drainage area maps. e. Perform existing condition hydrologic calculations (2-, 10-, and 100-year rainfall events) based upon NOAA Atlas 14 rainfall data and HCED and HCFCD PCPM drainage criteria for roadways. We will utilize XPSWMM software to perform the analysis. f. Analyze conveyance capacity of existing condition roadside ditches, culverts and contributing storm sewer systems to the outfall on Grant Road g. Perform Proposed Conditions Drainage Analysis to include proposed conditions drainage map, proposed conditions hydrologic calculations utilizing Atlas 14 rainfall data, comparison between existing and proposed condition hydraulics for 2-, 10-, and 100-year flow events, develop two (2) proposed drainage conveyance alternatives such as storm sewers, roadside ditches or a combination of both. We will utilize XPSWMM software to perform the analysis. h. Engineer will provide HCED with exhibits illustrating the various drainage alternatives and corresponding inundation maps, along with a summary table of those options, associated costs and metrics indicating reduction in flood risk to structures as well as roadway. HCED will review and approve the submittal permitted prior to scheduling that adoption date. If the pre-drainage Project must be modified to meet the new rule criteria, additional scope and drainage meetingfees will apply to update the design and permitting. i. Develop measures to mitigate increases in water surface elevations and/or flow associated with the proposed roadway and drainage improvement project, due to impacts from changes in impervious cover, routing of offsite flows and impacts to receiving storm sewer system along Grant Road. j. Drainage Coordination