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Cost Share Programs - Agricultural Cost Share Program (ACSP)


Water Control Structure


A Water Control Structure means a permanent structure placed in a farm canal, ditch, or subsurface drainage conduit (drain tile or tube), which provides control of the stage or discharge of surface and/or subsurface drainage. The management mechanism on the structure may be flashboards, gates, valves, risers, or pipes.

The primary purpose of the water control structure is to improve water quality by elevating the water table and reducing drainage outflow. A secondary purpose is to restore hydrology in riparian buffers to the extent practical. Elevating the water table promotes denitrification and lower nitrate levels in drainage water from cropping systems and minimizes the effects of short-circuiting of drainage systems passing through riparian buffers. Other benefits may include reduced pollution from other dissolved and sediment-attached substances, reduced downstream sedimentation and reduced storm water surges of fresh water into estuarine area.

This practice is not intended to be used to control water inflow from tidal influence (i.e., no tide gates).


Maintenance Period 10 years
BMP Units Each
Required Effects
  • Acres affected - (drainage area)
  • Nitrogen saved
  • Phosphorus saved
JAA/NRCS Standards
  • ENG – 587 – Structures for Water Control – flash board riser
  • ENG – 378 – Pond – in-line structures
  • ENG – 554 – Drainage Water Management - (supporting practice)
Cost Information
  • Average cost (75% or 90%)
CS2 Reference Materials
  • NC-ACSP 11 Signature Page
  • Map with BMP location, fields and roads
  • NC-CSPs-WCS form
Additional Spot-check Requirements None

ACSP Policy Summary

CS2 Common Components

Design Standards


NCDA&CS Division of Soil & Water Conservation, Vernon Cox, Director
Mailing Address: 1614 Mail Service Center, Raleigh NC 27699-1614
Physical Address: 216 West Jones Street, Raleigh North Carolina 27603
Phone: 919.707.3770

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