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How do I estimate what I need?
    Placement as a general "Rule-of-thumb” is not critical.   With LeakyPipe spaced at between 600mm-900mm (2-3 foot) apart you could estimate the LeakyPipe meterage by estimating the total soft landscaping area and multiplying this by 1.5 to give you a total.  Connectors and supply pipe polytube are not that expensive and are usually something best estimated plus a percentage over.