Page 12 - Envirotubes Dewatering Manual

instead of one 200’ Envirotube® the elevation loss for the 200’ will be 6” instead of 12”.
Also the longer the Envirotube® on a lengthwise grade, the greater the stress on the structure of the Envirotube® as the Envirotube® tries to roll lengthwise. the Envirotube® is very heavy and will tend to roll downhill.
pull the Envirotube® straight. Any kinks or wrinkles in the side of the tube will result in a large kink and weak place in the tube. It will also cause the tube to roll.
Concern #2: The Erosion Problem
In order to prevent erosion of the soil underneath the Envirotube®, place the Envirotube® on a hard waterproof surface like concrete or asphalt. If unavailable, an underlayment must be used (see page 6).
When placing the Envirotubes®, an escape route must be prepared to prevent water being trapped behind the Envirotubes® in the laydown area.
Any time the water runs on uncovered ground, severe erosion will be encountered.
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