I have a steep slope in my backyard which I'd like to drip-irrigate.
The highest point of the slope is a good 15 feet above the main level.
Can I place the valve (LawnGenie) at the main level or do I have to
put it on the top of the slope? If the Lawngenie will not work at the
low position, would thre be any other type of valve that will? Thank
you.

Hello sandy_yago-ga,

I went to the Lawn Genie website, found some information, and called
them to verify this information. If you have any further questions,
Lawn Genie says that "helping you is what we?re all about", so please
feel free to contact the company.

1-800-231-5117
Lawn Genie Technical Assistance Line
http://www.lawngenie.com/ask.htm

Lawn Genie reccomends that you:

 "To prevent backflow, make sure valves are at least 6" above the
highest sprinkler head (or higher if required by local codes). Space
valves at least 5" apart for easy assembly and maintenance."

With drip irrigation, your water will be going down the slope at a
slow pace, so ideally, since little water pressure will be used, you
should place the valve as high as possible.

I called Lawn Genie like I mentioned and they agreed with the idea of
putting the valve as high as possible. They stressed having you call
them with any questionsbecause they're more than happy to help you get
exactly the right valve and system for your needs.

Lawn Genie also offers a planning tool that may be of use to you.
http://www.lawngenie.com/design.htm
http://www.lawngenie.com/howto.htm

If this answer requires further explanation, please request
clarification before rating it, and I'll be happy to look into this
further.
Nenna-GA
Google Answers Researcher

Pretty much what i wanted. Thanks.

Thank you for the rating and I am glad I could be of help. You're more
than welcome.

Nenna-GA