The last few weeks have seen me chew over the ins and outs of many water collection designs for the tunnel. Most of the commercial solutions won't work due to the lack of vertical sides on my tunnel so I’ve come up with my own design.
The plan:
Use the off cuts of polythene left over from the constructing the tunnel to create a lightweight polythene gutter.
step 1. Lash together bean canes to create the side support for the polythene gutter.
step 2 wrap the polythene all the way round the canes once and secure to itself using tape.
step 3. drive 3 sets of supporting canes into the ground next to the tunnel to support the side cane.
Step 5. place the side cane onto the supports and make sure that any rain will run in the direction that you need it to.
step 4. Attach the side of the gutter nearest the tunnel to the cover with Polytunnel repair tape. (use a dual layer - make sure that pieces used to make the the top layer seal over the joins of the bottom layer - like roofing tiles)
Step 5. Test the gutter using a watering can and place the butt where the run off can be collected.
Step 6. drive a stake into the ground at an angle under the middle of the side support to prevent sagging.
Step 7. (optional) place weights inside the gutter to ensure that it keeps it shape during blustery conditions.
Step 8. wait for rain!
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