Drainage Design Clause Samples
Drainage Design. 4.8.1 The Developer shall provide a drainage system which will not increase, alter or affect the flow of surface waters, nor contribute to same, so as to damage, flood or adversely affect any property, either upstream or downstream of the Subdivision. The Developer shall also provide to the City the formal written opinion of a certified and licensed professional engineer certifying, as a professional engineer, that he has reviewed the entire watershed within which the subdivision is located and that upon full development at the greatest allowable use density, under existing zoning of all land within the watershed, the Subdivision will not increase, alter or affect the flow of surface waters, nor contribute to same, so as to damage, flood or adversely affect any property, either upstream or downstream of the Subdivision. Further, the Developer agrees to hold harmless and to defend the City and the City Engineer from any claim, cause of action or liability, alleged and/or proven, to have arisen directly or indirectly from alteration affecting the surface water by reason of the Developer’s design, construction, installation or the development itself, in whole or part. The aforesaid indemnity agreement includes, without limitation, the reasonable expenses of the City incurred in defending itself against any matter covered by such indemnity agreement, including attorney fees and expenses of litigation.
4.8.2 The Developer agrees that it will provide necessary erosion control, such as seeding for gentle slopes (4 to 1 or less), grass sod for steeper slopes, with special grading and terracing, to the specifications of the City Engineer. All freshly excavated and embankment areas not covered with satisfactory vegetation shall be fertilized, mulched and seeded and/or sodded as required by the City Engineer to prevent erosion. In the event the City Engineer determines that necessary erosion control is not being provided by the Developer, the proper governing authority shall officially notify the Developer of the problem. If the Developer has not corrected the problem within 7 days after the notice, then the proper governing authority shall make the necessary improvement to eliminate the erosion problem, documenting all expenses incurred while performing the work. Prior to releasing any Security hereunder, all expenses incurred by the governing authority relative to the foregoing shall be paid in full by the Developer plus interest thereon at the rate of ten percent ...
Drainage Design. The Consultant shall provide drainage layouts, drainage area maps, calculations, and design of all drainage components. The Consultant shall design all detention/retention ponds, conventional storm drainage and cross drainage in conformance with the State Hydraulic Design Manual (May ▇▇▇▇), ▇▇▇▇▇▇▇▇▇' criteria. The drainage design will be prepared to provide for the two-lane frontage section. At a minimum the drainage items to be provided shall include the detailed drainage area maps showing the final drainage areas and inlet and storm sewer calculations for revised storm sewer flow elements. All drainage designs shall be prepared in accordance with the findings presented in the Drainage Study. The proposed tasks are listed below: Conduct field trips to the Project site to investigate and confirm data and assumptions and assess general drainage conditions as needed; Review previous plans and drainage reports prepared by others which relate to drainage in the Project area (to be provided by the PMC); Prepare proposed drainage area maps for proposed improvements within the portion of the Project limits stated above; Design drainage structures located within the Project ROW, including open ditch drainage, storm sewer, inlets, manholes, subsurface drainage at retaining walls, and inlets/internal drainage piping where required on structures; Design and analyze the storm sewer system utilizing the WINSTORM Program and incorporate output to plan set; Design and analyze the roadside ditches for the proposed drainage criteria and incorporate results into the plans set on the roadway plan and profile sheets; Prepare storm sewer plan/profile drawings and special plan details, where required, for storm sewer system, laterals, junction boxes, etc. Identify potential utility conflicts during project design. Drawings will be prepared on 11” X 17” sheet at horizontal scale of 1”=100’ and vertical scale of 1”=10’; and Design cross-culvert extensions, if required, within the Project limits. This task is the extent to which designs and calculations regarding cross-culverts is required. Required drainage work outside the ROW will be performed by others.
Drainage Design. 1. Delineate drainage area tributaries and determine runoff in accordance with the NJDOT “Design Manual Roadway” as revised.
2. Design proposed drainage systems and determine runoff in accordance with NJDOT “Drainage Design Manual”, as revised.
Drainage Design. The Consultant shall finalize the design of the drainage and stormwater management systems. The Consultant shall verify the number and location of pond sites, floodplain compensating storage sites, and/or water quality and quantity treatment needed to appropriately meet the needs of the project.
Drainage Design. As directed by the DEPARTMENT, the CONSULTANT will conduct the following design services and submittals. Refer to the Roadway and Bridge Standard Design Scope of Services. • Total Maximum Daily Loads (TMDLs) • Basin Management Action Plans (BMAPs)
Drainage Design. The CONSULTANT will complete and submit to the CITY an exemption letter based on Section 3.2, Volume 1 of the 2019 Stormwater Management Manual for Western Washington. Products and Deliverables: • Stormwater Exemption Letter
Drainage Design. 4.4.1 Perform preliminary storm sewer sizing and alignment design. Prepare preliminary inlet design sheets and hydraulic design sheets for inclusion in the plans. • Storm drain profiles will be provided in the Final Design Submittal • The design of lateral extensions (if needed) and inlet replacements for existing inlet locations are included. The design of any storm drain main line capacity improvements and/or offsite drainage improvements to accommodate the proposed widening, if necessary, will be considered Additional Services.
4.4.2 Determine outfall grading requirements and provide plans and details for channel protection (if applicable).
4.4.3 Prepare drainage details to clarify intent of design
4.4.4 Compile applicable Town standard details. Supplement standard details as needed.
Drainage Design. 4.4.1 Perform final storm sewer sizing and alignment design from Preston Road to 1st Street. Finalize inlet design sheets and hydraulic design sheets.
Drainage Design. 1. A scope of services for drainage design shall be determined shall be compensated as Extra Work as stipulated in Section II of this agreement.
2. Profile scale H = 1”=20’; V = 1’=5’ F. Intersection details.
Drainage Design. Two potential stormwater outlets have been identified. The first outlet requires the LPA to petition the ▇▇▇▇▇▇▇▇ County Surveyors Office (HCSO) to reconstruct the existing Beaver and ▇▇▇▇▇▇ Drain as a storm sewer. The second potential outlet option is to the Windermere Subdivision where some stormwater runoff from the intersection currently discharges. Analyze the existing drainage conditions and analyze which outlet or combination of outlets yields the most benefit to the project. If the Beaver and ▇▇▇▇▇▇ drain is not reconstructed as a storm sewer and discharging flow from the entire project area to Windermere is not possible, an amendment will be needed to develop an alternative discharge location. Specific tasks to be completed are as follows: Watersheds will be delineated for the pre- and post-construction conditions. Ten-percent exceedance probability (EP) peak discharges will be computed according to the ▇▇▇▇▇▇▇▇ County Stormwater Management Technical Standards Manual (Manual). Analyze the Windermere storm water system to determine if there is any available capacity. From available GIS mapping, the storm system appears to currently drain portions of the northeast, southeast, and southwest quadrants of the intersection. Analyze the storm sewer system from these inlets to where they discharge into the pond at the west end of Governors Lane. The analysis does not include evaluating the flows from all the interconnected ponds within the subdivision. Determine which outlet or outlet combination provides the most benefit to the project area. Coordinate these discussions with the HCSO and the LPA. Storm sewer design will include inlet spacing calculations and modeling using Bentley StormCAD. As specified in the Manual: + Inlets will be spaced to pass the peak 10% EP event with 50% of sag inlets clogged, and the allowable pavement spread will be limited to maintain two clear 10-foot moving lanes of traffic. + Pipe design will include slopes capable of maintaining velocities between 2.5 and 10 feet/second. Minimum pipe size, cover, and separation from any sanitary sewers will be maintained. Any increase in runoff rates from the pre-construction condition will be detained on site. Methods of detention design will follow the Manual. In-line detention will be applied where feasible. Coordinate with the HCSO regarding connection to the reconstructed Beaver and ▇▇▇▇▇▇ system (if completed). Additionally, a drainage report, proposed storm sewer plans,...