The National Academies Press

Currently Skimming:

Pages 118-132

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.

From page 118... ... The chapter closes with the Camp Coldwater Springs case study as an example of the connections between drainage design and environmental justice. STATE OF THE PRACTICE The current environmental impact analysis process as it pertains to water quality and drainage is made up of five general steps. Read the entire page →
From page 119... ... A common modeling approach is presented in the "Evaluating water quality impacts to natural water bodies" discussion on page 124. Evaluating regulatory agency jurisdiction and requirements This component involves developing a list of all local, regional, state, and national agencies that may have an interest in the project based on the scope of the affected area. Read the entire page →
From page 120... ... State and federal coordinating agencies for water quality and drainage Area of concern Natural resources agency Pollution control agency EPA1 FEMA2 Corps of Engineers U.S. FWS3 Water quality Water quantity NPDES4 regulations and guidelines Wetland Conservation Act Navigable waters Floodplains Wildlife habitat Fisheries Lakes and streams 1. Read the entire page →
From page 121... ... Modeling tools to evaluate water quality impacts are commonly used in conjunction with topographic maps and land use and zoning information. The most commonly used model is the P8 Urban Catchment Model. Read the entire page →
From page 122... ... Input data generally is obtained from existing topographic maps, groundwater contour maps, and the preliminary plans of the proposed improvements, which illustrate changes in impervious areas, grading, and surface-water routing. SELECTING AN APPROPRIATE METHOD OF ANALYSIS The following is a discussion of methodologies for predicting the extent to which the water quality and drainage components of a transportation system change would differentially or severely affect protected populations. Read the entire page →
From page 123... ... Step 3 – Modify or alter the scope of the proposed improvements as necessary and practical to minimize or eliminate impacts to protected populations. METHODS The methods for assessing likely water quality impacts of a proposed transportation project are summarized in Table 5-3. Read the entire page →
From page 124... ... Land acquisition checklist Screening/ detailed Project/ corridor assessment Land acquisition could impact or displace protected populations Low Records review, survey/interview 2. Visual quality checklist Screening/ detailed Project/ corridor assessment Visual quality effects of water quality improvements could affect protected populations Low Visual quality design and communication 3. Read the entire page →
From page 125... ... If the answer is no, there are no adverse effects to protected populations. Suggested approach. Read the entire page →
From page 126... ... If improvements are located within the activity space of protected populations, consider conducting a field survey or using GIS, as appropriate, to perform a line of sight, view-shed, or some other type of visibility analysis. Perform a visual quality assessment. Read the entire page →
From page 127... ... Review the list and findings with members of protected population groups through interviews, public meetings, focus groups, surveys, or some other form of feedback. Will the proposed water quality or drainage improvements reduce accessibility to water bodies used for recreation or reduce the level of safety in traveling to or using the water bodies? Read the entire page →
From page 128... ... If any of these situations exist in the study area, determine if there are impacts to protected populations using techniques described in Chapter 2. In the case of such impacts, consider the following mitigation techniques: • Reconsider roadway and drainage design to minimize effects to groundwater. Read the entire page →
From page 129... ... . The environmental analysis should consider whether or not the potential impacts to surface water quality caused by raising high water elevations in a localized area would adversely impact protected populations. Read the entire page →
From page 130... ... Designing ponds that are larger and flatter rather than deeper and smaller will result in lower flood elevations. – Utilize structures within the roadway to improve water quality and quantity issues if ponding areas create adverse impacts to protected populations. Read the entire page →
From page 131... ... Public issues with this project thus arose out of special values and beliefs held by specific population groups, some of them protected populations that placed cultural value on the natural condition of the springs. The checklists included with this guide would have triggered evaluation of the impact to Camp Coldwater Springs. Read the entire page →
From page 132... ... 135 For more information on the p8 urban catchment model see http://www.wwwalker. Read the entire page →

From page 118...

... The chapter closes with the Camp Coldwater Springs case study as an example of the connections between drainage design and environmental justice. STATE OF THE PRACTICE The current environmental impact analysis process as it pertains to water quality and drainage is made up of five general steps.