Drainage Analysis. The Consultant shall finalize the drainage design for the project including underdrain as necessary using the design standards that are applicable for the appropriate Water Management District, Florida Department of Environmental Protection, Federal Emergency Management Agency, and applicable County standards as determined by Engineering. The final drainage design shall consider and address property impacts in accordance with section 5.4 of this scope of work.
Drainage Analysis. The CONSULTANT will perform drainage analysis by delineating the basin boundaries by using LiDAR information, existing survey data, and field observations. The CONSULTANT will analyze and determine high water elevations in each basin and use the information to establish the preliminary roadway profile. Drainage analysis will also include checking the capacity and structural adequacy of existing cross drains, preliminary design of potential cross drains and outfall structures and identifying the recommended conceptual drainage design for the Project.
Drainage Analysis. The 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 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 complete analysis. Full coordination with all permitting agencies, the County’s Environmental Management section and Drainage Design section will be required from the outset. Full documentation of all meetings and decisions shall be included in the Drainage Design Documentation. These activities and submittals should be coordinated through the County’s Project Manager. The exact number of drainage basins, 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. 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 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 proposed trail. If all or portions of the project meet permit agency exemption requirements, the Design-Build Firm shall obtain written letters confirming the exemptions.
B. All impacts and replacement of existing floodplains and historical basin storage within ditches and low depression areas along the project shall be determined and 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 ...
Drainage Analysis. Consultant will produce a drainage analysis to determine the necessary drainage improvements and required drainage system capacity, and may include the width of the road right-of-way plus up to ten feet on each side of the right-of-way to calculate the eligible size of the stormwater system. Increases to the stormwater system to accommodate a drainage area greater than the eligible size shall not be considered. Improvements to address runoff from private roads and/or developments shall not be included.
Drainage Analysis. A site drainage analysis for the development of the site will be prepared and submitted to City of Tomball and Harris County Flood Control District (HCFCD). The goal of the drainage analysis is to demonstrate no adverse impact to offsite stormwater runoff from the proposed expansion of the WWTP based on City of Tomball and HCFCD drainage criteria. The following tasks are part of the site drainage analysis.
a. Conduct one (1) site visit: Conduct a site visit to identify existing drainage patterns and possible outfall locations, which will be coordinated with the City. The discharge point will either be an existing roadside ditch, storm sewer system, or an existing drainage channel.
b. Data Collection: Collect available topography, aerial photos, as-built plans for drainage infrastructure, and coordinate with the City and HCFCD to obtain past drainage studies for the site.
Drainage Analysis. 5.1 Conduct Field and Record Investigations Xxxxxxx shall conduct field and record investigations of the project sites for proposed improvements. These services will include the following tasks:
5.1. a Inspect project sites and document representative existing conditions with digital photos. Provide the City of Grand Island electronic copies of the photos taken.
Drainage Analysis. The Consultant will be responsible for designing a drainage and stormwater management system. All design work will comply with the latest requirements of the appropriate regulatory agencies and the County’s Stormwater Manual for Site, Development, Subdivision, and Capital Improvement Projects. All hydraulic modeling and analysis will be done in accordance with the most current edition of Sarasota County Model Maintenance procedures and guidelines for site development, subdivision and capital improvement projects. The Project is anticipated to fall under the thirty-five (35) acres of area and below the eight (8) acres of impervious threshold not requiring modeling through Sarasota County’s process.
Drainage Analysis. The Engineer shall prepare a drainage study that must; identify the impacts to abutting properties and the 100-year floodplain due to proposed highway DocuSign Envelope ID: 561C61B0-0796-4EF9-913A-E2D2252E0890 improvements, identify the water surface elevations for the design and 100 year storm events, identify/size/locate outfalls, drainage outfall descriptions, provide overall drainage area map, sub-drainage area map, storm water detention facilities, and provide a drainage study report identifying the results of the study. The Engineer shall include applicable calculations and/or hydrologic and hydraulic models such as HEC-RAS, HEC-HMS and other applicable legacy models.
Drainage Analysis. A. Engineer to model and analyze anticipated stormwater flows upstream of the Elm/Xxxxx Street intersection (Xxxxx/Hawthorne Drainage Basin).
a. Engineer to utilize HEC-HMS as a hydrological model as well as SWMM to determine hydraulic characteristics of existing detention ponds.
b. Hydrologic model to utilize current Rapid City Infrastructure Design Criteria with any exceptions documented.
c. 2015 City of Rapid City LiDAR to be incorporated for subbasin delineation.
d. Onsite survey of detention cell outlet structures to be provided by the engineer to supplement LiDAR information as well as used to determine detention cell stage/storage/discharge characteristics.
e. HEC-HMS hydrologic model to estimate probable flows for the 2, 10, and 100 year storm events throughout the study area.
f. To aid future drainage infrastructure design, the engineer shall develop an exhibit depicting anticipated peak flows for the 2, 10, and 100 year storm events along various points of interest (street intersections being prime locations). Engineer to note that multiple street sections in the study area discharge some surface flows to other street sections when stormwater depths reach certain levels. The hydrological model shall incorporate these bypass areas within the analysis to better depict local stormwater flows through the street network.
g. Engineer to account for constructability of future inlet installation along the proposed preliminary box culvert routes. Engineer to note conflicts that may occur with other utilities and note these conflicts for discussion when finalizing box culvert route with City.
h. Engineer to prepare a drainage report summarizing the findings of the hydrologic analysis. Report to include but not limited to the following: summary tables of peak flows with hydrologic element location/description, tables of stage/storage/discharge for detention ponds, exhibit depicting delineated subbasins, summary of all engineer assumptions, and table of time vs peak flows for all hydraulic elements.
i. Engineer to analyze probable stormwater depths in street sections. Engineer to determine if narrowing the pavement width from 32’ to 26’ and/or other street section geometry changes within the project area may inundate private property with stormwater.
Drainage Analysis. GENESIS will complete stormwater modeling necessary for permitting of the proposed improvements. This proposal includes the design of dry stormwater facilities intended to provide required treatment and attenuation volumes for the increased impervious area proposed on site. ▪ Development of a Drainage Basin Map, which will identify all areas contributing stormwater runoff to the project site as necessary to complete storm sewer design. This task is related to the design of the parking lot storm sewer ▪ Development of a Proposed Conditions Stormwater model for the proposed dry detention facilities to be constructed on the south side of the project. This model will calculate peak runoff volumes, rates, and stages based on the proposed condition. Sand chimneys are anticipated to provide the required drawdown of the facilities. ▪ Preparation of a Stormwater Analysis Report, suitable for use in permitting the proposed improvements, which will include the following: o Summary of the project and modeling results o Site Location Map o Drainage Basin Map o Results of Existing and Proposed Condition Stormwater Models, which will include all input and output data This Drainage Analysis task does not include offsite stormwater modeling or extensive drainage basin modeling.
