Northeast Region Certified Crop Adviser (NRCCA) Study Resources

In This Section

• PO 56 Watershed functions
• PO 57 Water inputs & outputs
• PO 57 Water inputs & outputs 2
• PO 57 Water inputs & outputs 3
• PO 58 Stream hydrograph
• PO 59 Pollutant delivery process
• PO 60 Precipitation return periods
• PO 61 Sources of contaminants
• PO 62 Aquifers
• PO 63 Well pumping and drawdown
• PO 64 Geologic conditions & contamination
• PO 65 Recharge areas
• PO 66 Hydrologically sensitive areas
• PO 67 Wetlands & riparian buffer zones
• PO 68 Multiple-barrier watershed
• PO 69 Impaired water bodies
• Summary

Competency Area 6: Watershed hydrology AEM

PO 68. Understand the multiple-barrier concept in watershed protection.

The multiple barriers concept is a strategy applied to minimize the occurrence, availability, and transport of pathogens to surface and groundwater supplies. It consists of four major barriers:

• Imports and bio-security to reduce occurrence of unwanted pathogens
• Animal health and hygiene to minimize the spread and availability of pathogens
• Waste management to contain and further reduce availability
• Land application BMP practices to reduce transport and off-site exports

More information and implementation of the multiple barrier concept is addressed by the New York's USDA NRCS Conservation Practice Standards (http://www.nrcs.usda.gov/programs/watershed/).