Siphonic Roof Drainage Design Software. Our software is compact, cheap, easy to learn, easy to use. Standard versions for HDPE, PVC, CIP, GSP pipe systems. Other pipe systems on request.Language in English and Chinese, other languages on request. Personalization with own logo. Edit functions for own adaptation. For Windows 10, available via download for local operation. 25 years of experience. 100 million square meters of roofs successfully designed.