Drainage Report. 1. DRAINAGE ELEMENTS The Engineer shall perform field work and analysis necessary to design the drainage elements for designated locations and sections of roadways. The Engineer shall:
a. Perform field work and analysis necessary to design the drainage elements for at the designated location.
b. Provide relevant sheets for inclusion within the PS&E package.
c. Provide electronic files of the design and PS&E Package.
Drainage Report. 1. The Engineer shall prepare a single comprehensive drainage study and report of the project area. The report shall be divided into two (2) phases:
a. Obtain existing HEC-2 or HEC-RAS models from applicable drainage authorities to the extent possible, for use in analysis and determination of the existing 2, 5, 10, 25, 50, 100 and 500 year (if available), water surface elevations at bayous, creeks, and ditch crossings along the project. This data will be utilized in the development of design roadway profiles.
b. Profile of natural ground along each proposed grade line of the roadway.
c. Profile of tentative proposed grade line of the roadway.
d. Profile of existing roadway.
e. Identify the existing drainage outfalls.
f. Identify the names of existing creeks, bayous and ditches within the project limits.
2. These profiles shall be superimposed on a drawing along with the 2, 5, 10, 25, 50, 100 and 500 year (if available) water surface elevations. The profile drawing will provide an overall view of the roadway/existing ground elevations with respect to the various storm design frequencies for the length of the project. This will enable the State to determine the most feasible proposed roadway profile. These profiles must be submitted to the State and approved before continuing with the preparation of the comprehensive drainage report. NOTE: THE ENGINEER SHALL COORDINATE WITH ALL GOVERNMENT AGENCIES THROUGH THE STATE’S DISTRICT OFFICE.
a. Manhole head losses shall be computed as per the State’s direction. Also, THYSYS (WINSTORM) computations are not needed for hydraulic grade line investigations. The head losses shall be computed with a pressure flow equation generally applicable to pipe running full flow. A hydraulic grade line starting at the outfall channel will be determined for each storm sewer system in order to obtain a design tailwater for each existing system. The design tailwater shall be the starting basis for the design of the proposed storm sewer system.
b. For drainage areas, the Engineer shall limit the outfalls into existing storm sewer to existing capacity flows, which will be determined by the Engineer. Alternate flow routes, if feasible, shall be looked into for relieving storm sewer overload. The amount of the total detention storage to control storm sewer runoff for the design frequency shall be determined based on hydrograph routing, as well as a rough estimate of the available on-site volume.
c. Drainage areas and flows for cross culvert...
Drainage Report. The scope for work for this Drainage Mitigation Study is to support additional roadway development. • Drainage Mitigation Study The purpose of this task is to prepare a Drainage Mitigation Study to determine the 100-year storm impacts resulting from construction of the project and to develop and analyze alternatives to mitigate these impacts. The following tasks describe the work to be performed: Prepare 100-year storm drainage area maps for existing and proposed conditions, which include the typical Fort Bend County roadway improvements within the project limits and the proposed right of way (ROW). Compute existing and proposed peak flows based on the Fort Bend County methodology within the existing and proposed ROW. Compute required 100-year storage volumes within the ROW to determine mitigation requirements for the proposed condition. Prepare existing and proposed hydrographs at each outfall location to develop mitigation alternatives to implement the required 100-year mitigation. Prepare a Drainage Mitigation Preliminary Engineering Report to summarize and document the findings of this study. The report will include the following items at a minimum: Provide electronic draft copies of the report for PMT review and upon approval.
Drainage Report. A drainage report is required if the Grade Separation Project necessitates changes in existing drainage patterns or increases in drainage flow on Railroad right-of-way. See Section 4.5.2 and 4.5.3 for hydraulic criteria to be used.
Drainage Report. 5 Developer shall prepare a preliminary Drainage Report(s) for the Project drainage system(s) in 6 accordance with Chapter 4 of the ADOT Highway Drainage Design Manual – Hydraulics and 7 shall include all calculations and analysis in the report as required by the Contract Documents. 8 Developer may prepare the preliminary Drainage Report(s) per drainage system, Project 9 Segment, or for the entire Project. 10 At the same time as Initial Design Submittal for the associated drainage improvements, 11 Developer shall submit a preliminary Drainage Report to ADOT for review and comment.
Drainage Report. 1. The Engineer shall prepare a single comprehensive drainage study and report of the project area. The report shall be divided into two phases:
a. Obtain existing HEC-2 or HEC-RAS models from applicable drainage authorities to the extent possible, for use in analysis and determination of the existing 2, 5, 10, 25, 50, 100 and 500 year (if available), water surface elevations at bayous, creeks, and ditch crossings along the project. This data will be utilized in the development of design roadway profiles.
b. Profile of natural ground along each proposed grade line of the roadway.
c. Profile of tentative proposed grade line of the roadway.
d. Profile of existing roadway.
e. Identify the existing drainage outfalls.
f. Identify the names of existing creeks, bayous and ditches within the project limits.
Drainage Report. 6 CONSULTANT will update and expand upon the Preliminary Drainage Report that was prepared during the 7 Preliminary Engineering / Environmental Clearance / Technical Report phase of the project. CONSULTANT 8 has previously determined the existing drainage patterns and storm drain facilities in the project area, including 9 existing channels/ditches, pipe/culvert locations, sizes, local rainfall intensities, and flows. This information will 10 be used for on-site hydrologic analyses of the existing and post-project condition, emphasizing the primary 11 objective of maintaining existing flow patterns and runoff amounts. 12 The on-site analyses will include identifying where new facilities are needed, developing drainage boundaries 13 for the areas within the project limits, developing flows for each facility based on Rational Method calculations, 14 and laying out the new/retrofitted storm drain facilities. The off-site analyses involve obtaining flows for the 16 or upgraded facilities for these flows. If flows are not readily available for these water courses and the 17 contributing watersheds exceed 0.5 square miles, ENGINEER will approximate the off-site flows based on the 18 conveyance of facilities immediately up- or downstream. For off-site watersheds less than 0.5 square miles in 19 area, drainage boundaries will be developed, and flows calculated based on the Rational Method where 20 appropriate.
Drainage Report. A Drainage Report will be completed for this project in accordance with City of Tempe standards, based on our preliminary engineering design. The results of this report will be incorporated in the final grading and drainage design. Storm water facilities and storm drain systems will be sized to collect, convey, and retain storm water generated onsite. Offsite or regional drainage issues are not anticipated for this project.
Drainage Report. As a part of the Xxxx Xxxxxx team, HDR|WRECO will utilize PDR Report prepared during 30% design phase as the basis for final design to prepare draft drainage report, which will include calculations to assess the need for any drainage modifications and any updated drainage design criteria. The results and design recommendations will be summarized in the Drainage Report and will include construction implementation of the drainage systems. The hydraulic evaluation of the Old Alameda Creek hydromodification management alternative will be documented in the report for the 15- and 100-year events. The calculations will be performed building on the conceptual design’s HEC-HMS, EPA SWMM 5, and HEC-RAS models. Old Alameda Creek will be evaluated to determine if the potential improvements cause objectionable backwater for the on-site and off-site systems or increase flow rates to Alameda Creek in the 15-year and 100-year events. The tailwater boundary condition will be set to the Alameda Creek design water surface elevation at the discharge point for each design event. The report is expected to include an evaluation of the existing facilities and proposed conditions, unusual and special conditions, drainage mapping, hydraulic analyses, and documentation of the drainage design decision made as part of Pre-Design Report (PDR) Process.
Drainage Report. Attached hereto as Schedule "J" is a Drainage Report, accepted in principle by the Municipal Engineer which sets out generally all matters which may require consideration with respect to drainage in the drainage area of which the subdivision form’s part.
