Constraints & Criteria

Criteria:

• Rock or other material used will not wash away during high flows
  • A rock large enough to resist blow out in high velocity streams is necessary
  • Material anchored strongly enough to resist blow out in high velocity streams
• The updated design note must comply with all criteria in VA CPS 578
  • The "USDA - NRCS Conservation Practice Standard 578: Stream Crossing" is the standard for cattle stream crossings in Virginia and includes general criteria such as location of crossing along the stream reach, which must still be followed
• Designing a crossing that will safely allow cattle and equipment to access fields south of Catawba Creek

Constraints:

• Obtaining material other than rock and geotextile for design testing
• Availability of required surveying equipment
• Coordinating with the Catawba Sustainability Center Manager to find suitable times to survey the site
• Designing a low cost crossing for the Catawba Sustainability Center
• Creating a sustainable crossing that requires little maintenance
• Find a proposed crossing location that will require little grading and clearing of vegetation