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ROCK FILTER DAM
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972-575-8800 D/FW
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ROCK FILTER DAM

SEDIMENT BARRIER   CHANNEL PROTECTION




CHECK DAM CONSIDERATIONS

check dam can be either temporary or permanent, built across a minor channel, or drainage ditch. By reducing erosion and gullying in the channel the check dam allows sediments and pollutants to settle. They also reduce the velocity of water flow during rain storms. Check dams can be built with rock wrapped in poultry netting, rock/gravel bag, sack gabions and are usaully permanent or semi permanent and organic filter tubes.are used for temporary uses. 

Check dams are effective in small channels with a contributing drainage area of two to 10 acres. Multiple check dams, spaced at appropriate intervals, can be effective. Dams used in a series should be spaced so that the base of the upstream dam is at the same elevation as the top of the next downstream dam .

Do not build check dams in live, flowing streams unless approved by an appropriate regulatory agency The primary function of check dams is to slow runoff in a channel. Do not use them as a standalone substitute for other sediment-trapping devices. 

NCTCOG BMP
  MATERIALS YOU NEED  



STRAW WATTLES


POULTRY NETTING & ROCK



SAND BAGS



SACK GABION









HOW TO CALCULATE ROCK 
QUANTITY FOR ROCK CHECK DAM


             
    • STEP 1

      Add the length (in feet) of the top edge to the measurement (in feet) of the bottom edge parallel to the top. For instance, a trapezoid with a top edge of 3 feet and a bottom edge of 5 feet would equal 3 + 5 = 8 feet.

      STEP 2

      Multiply the sum of the two parallel sides by ½. For the example, 8 feet x ½ = 4 feet.

      STEP 3

      Multiply the measurement of the height in feet by the result to find the area of the trapezoid. For the example, if the trapezoid had a height of 3 feet, then its area would equal 4 feet x 3 feet = 12 square feet.

      STEP 4

      Find the volume of a trapezoidal prism with a trapezoid base by multiplying the area of the trapezoid by the height of the container to find the cubic feet in the trapezoidal container.

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