Drainage Analysis Sample Clauses

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 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. Develo...

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. Engineer to model and analyze anticipated stormwater flows upstream of the Elm/▇▇▇▇▇ Street intersection (▇▇▇▇▇/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. 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. 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. 5.1 Conduct Field and Record Investigations ▇▇▇▇▇▇▇ 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. DRAFT 1) The ENGINEER will be responsible for designing a drainage and stormwater management system for SW 38th Street for a length of approximately 3,000 feet. This work will include the engineering analysis necessary to design the following: cross drains, roadway ditches, outfall ditches and storm sewers. The design work will comply with local and state requirements. 2) The scope of work of this Agreement also does not include modification of flood insurance rate maps through FEMA. 3) The Drainage Design Report (as part of the original agreement) will incorporate the work undertaken in the preliminary engineering phase of the project and will include final calculations for the proposed storm drainage system, final pond calculations and information required for permit review and approval.

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.