Step 2-Starting Point:

The end of the AquaDam® will have long fill tubes to start with (usually 2-6 foot long). These are for connecting one AquaDam® to another using a collar. They are not the start of the AquaDam®. The AquaDam® starts at the outside (usually black or white) master tube that confines the two inside fill tubes (see Figure 1). Position the end of the outer tube up the bank at least as high as the AquaDam® will be when fully inflated (i.e., a 3 foot high AquaDam® would have at least 4 feet in elevation up the bank. The bank slope will have to be calculated in, and the end will have to be higher than the water level inside the AquaDam® after inflation. The AquaDam® will only achieve a height of 3+ feet at the lowest point along it's path.).

If the bank is not steep enough to achieve the necessary starting height, a small amount of fill material can be placed at the waters edge to create a false bank or berm. This is the least expensive way to make a good starting point. Double closed-ended AquaDams® do not require a bank to start from, and can actually be started in the middle of a river or body of water. 



Step 3-Preparing the AquaDam® for Inflation:

Insert a discharge hose into each inside fill tube. Excess fill tubes can be cut off if not desired for future use. Wrap duct tape or tie packing rope tightly around the fill tubes to keep the discharge hose from slipping out. The corners at the end of the AquaDam® can be tied to a tree or rock to prevent it from slipping down the bank slope. For smaller dams (3 feet and under), laborers are needed to stand in back of the AquaDam® roll at the foot of the slope along the water sedge. The pumping begins by pumping into both inside tubes at the same rate. The rolled portion of the AquaDam® will try to unroll, and will push up against the laborers' legs. The laborers' will wait for the water level to rise and build pressure inside the AquaDam®. When the height of the AquaDam® is great enough, the laborers should take a step back. Then they must wait until the height builds up again before taking another step backwards. All laborers must step backwards in unison and cooperate so that nobody's foot gets caught under the unrolling AquaDam®. Water levels inside the AquaDam® must be kept at a level higher than the upstream water side of the AquaDam® (see Pacific Gas and Electric and other installations). This water depth will increase as the unrolling AquaDam® begins to constrict (cut off) the stream flow.

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