Stormwater Management Report. Consultant shall provide a stormwater management report outlining the stormwater management design for each design milestone: 60%, 90%, and 100%. For the report, Consultant shall use data and information collected from available mapping, site visits, and other available methods. The stormwater management report shall provide: • Testing results of existing UICs in the project area should be completed to provide additional design information for sizing of the UICs and verify the proposed design meets the minimum requirements. • Refinement of the design of the proposed sedimentation manhole for Stations 51+55.50 and 58+87.70. • Refinement of the design to meet the minimum requirement (i.e., treatment of the water quality volume and matching the post-development, 2- and 25-year peak runoff rates to the existing 2- and 25-year peak runoff rates). • Refinement of the design to avoid existing utilities, where possible, and to accommodate offsite stormwater contributions. • Discuss flow control options for Stations 51+55.50 and 58+87.70 including pipe storage or off-setting by detaining additional stormwater in another location in the project area. • Spread and conveyance calculations for proposed storm sewers will be analyzed with respect to capacity, existing conditions, and the modifications to the project hydrograph from the use of stormwater planters and UICs. • Refinement and sizing of UICs and sedimentation manholes. • Assessment of utility conflicts and proposed required relocations or adjustments. • Research and complete process for abandonment of existing drill holes. Assumptions: • Existing storm mains are located on NW Newport Avenue, NW Hartford Avenue, NW Elgin Avenue/alleyway and NW Baltimore Avenue/alleyway. The City will assess the need for regional water quality manholes at these locations to treat the larger overall drainage basin and capitalize on project construction.
Stormwater Management Report. Consultant shall provide a stormwater management report outlining the stormwater management design for each design milestone: 60%, 90%, and 100%. For the report, Consultant shall use data and information collected from available mapping, site visits, and other available methods. The stormwater management report shall provide: • Testing results of existing UICs in the project area should be completed to provide additional design information for sizing of the UICs and verify the proposed design meets the minimum requirements. • Refinement of the design to meet the minimum requirement (i.e., treatment of the water quality volume and matching the post-development, 2- and 25-year peak runoff rates to the existing 2- and 25-year peak runoff rates). • Refinement of the design to avoid existing utilities, where possible, and to accommodate offsite stormwater contributions. • Spread and conveyance calculations for proposed storm sewers will be analyzed with respect to capacity, existing conditions, and the modifications to the project hydrograph from the use of stormwater planters and UICs. • Refinement and sizing of UICs and sedimentation manholes. • Sizing and design of a regional water quality facility to treat stormwater runoff from as much of the 176 acre contributing drainage basin as feasible. • Replacement of the stormwater system along the entire length of the corridor. Assumptions: • The use of drywells for disposal and retention is feasible and a stormwater detention system is not needed to meet the City’s flow reduction requirements.
Stormwater Management Report. The Stormwater Management & Flood Control Analysis dated May 2012, prepared by Xxxx-Xxxxxx Engineers, Inc. attached as Exhibit I.
Stormwater Management Report. Provide a stormwater management report outlining the stormwater management design for each design milestone: 30%, 60%, 90%, and 100%. For the report, the PDB team will use data and information collected from available mapping, site visits, and other available methods. The stormwater management report will be per Central Oregon Stormwater Management and City drainage standards and specification. Deliverables/Schedule: • 60% Stormwater Management Report to be submitted with the 60% Design, one (1) electronic copy • 90% Stormwater Management Report to be submitted with the 90% Design, one (1) electronic copy • 100% Stormwater Management Report to be submitted with the 100% Design, one
Stormwater Management Report. 4.1 A stormwater management report and a construction mitigation plan is to be prepared by a professional engineer with experience in this field and submitted prior to the issuance of a Development Permit. The report will consider the technical reports referenced in Section 1 and include phosphorus attenuation measures such as directing runoff and overland drainage from driveways, parking areas, other hard surfaces to soak away pits, infiltration facilities.
Stormwater Management Report. A Stormwater Management Report setting out the existing and proposed drainage pattern shall be submitted to and approved by the Director of Infrastructure and Development, the local Conservation Authority and the Ministry of the Environment. The stormwater management requirements within the Municipality shall be those of the local Conservation Authority or as listed below. The general requirements are as follows: Quality and quantity control – as dictated by the local Conservation Authority and MOE requirements in accordance with the MOE “Stormwater Management Practices Planning and Design Manual” or the most recent version thereof. Quantity control shall restrict post-development runoff flows to pre-development flows between the 5 and 100 year events. The design storm for the minor systems shall be the 5 year storm for local storm sewers and the 10 year storm for trunk facilities. Sediment and erosion control measures associated with the stormwater management requirements shall be identified on the drawings for works to be included during the construction and for permanent measures. A manual shall be provided outlining the maintenance and operating requirements for any stormwater management measures proposed.
