Drainage Assessment Clause Samples
Drainage Assessment. Perform a drainage assessment associated with the site development to quantify existing and proposed peak discharges for the site. Peak discharges will be developed for the 2, 10, 100, and 500-year storm events and will be determined from Atlas 14 Site Runoff Curves provided in the Harris County Flood Control’s (HCFCD) Policy Criteria & Procedure Manual (PCPM), updated 10/23/18. The required detention volume will be computed using Method 1 from the HCFCD PCPM. The WWTP expansion is partially located within the effective Willow Creek 500-year floodplain. If any fill is placed within the effective 500-year floodplain, floodplain fill mitigation will be required in addition to the detention associated with additional imperviousness. There is currently a remapping effort being completed by HCFCD for the Willow Creek Watershed, which may impact the requirements by HCFCD for the drainage of this project. If any additional tasks are required beyond what is detailed in this scope, they will be considered an additional service. Identification of sizing of drainage improvements (included but not limited to channels, storm sewers, roadside ditches, or streets) downstream of the site are not included as part of this scope of work.
Drainage Assessment. CONSULTANT will update the Drainage Assessment deliverables (approved November 2015) to include an updated project description and exhibits as a result of the additional design variations. CONSULTANT will perform a hydromodification (Rapid Assessment Stream Crossing) analysis based on the updated guidance. Scope of work excludes modifications to offsite hydrology that has been approved. CONSULTANT will update the Location Hydraulic Study and Floodplain Evaluation Summary in accordance with revised project description and applicable exhibits. CONSULTANT will conduct a two-dimensional floodplain analysis of the offsite areas to the north of the proposed project to address the lack of detail in the Awareness Floodplain mapping.
Drainage Assessment. CONSULTANT will identify drainage impacts associated with the export of fill material from the Badlands County Landfill. Based on feedback from Riverside County Department of Waste Resources, basins and other BMPs will be evaluated at the mandatory borrow site. Final plans will be developed during the PS&E phase.
Drainage Assessment. Stantec will identify drainage improvements, relocation or realignment of adjacent channels, retention basins, storm drains, and determine the drainage improvements for on-site and off-site drainage facilities. Impacts on and replacement of these facilities shall be analyzed and included in the cost estimate. Existing hydrology for offsite flows will be provided by the city. Freeway drainage will be reviewed to assess changes to existing drainage patterns and the adequacy of the existing systems. Freeway, County and CITY drainage systems will be reviewed and the impacts of the proposed alternatives on these facilities will be studied. The primary areas of interest are the two RCB culvert crossings of SR 138/14 and the culvert crossing of Avenue G that conveys the outfall from Pond Two. Necessary drainage structure replacements and/or improvements including incorporation of Water Quality Best Management Practices will be reflected in the cost estimates. Stantec will prepare a Location Hydraulic Study and Floodplain Evaluation Summary (if necessary) in accordance with Caltrans standards for two (2) build alternatives. • Identification of Major Drainage Improvements on Layout Plans or, if required, individual drainage layouts • Inclusion of Drainage Improvements in Cost Estimate • Draft/Final Location Hydraulic Study • Draft/Final Floodplain Evaluation Summary (if necessary)