"just carry plenty and use more than you need!"
No, carry the right size and juste enough to avoid chaffing on the sea bottom, and then ROPE..
See the excellent Alain Fraysse's web page explaining why on:
http://alain.fraysse.free.fr/sail/rode/rode_b.htm
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The book: « THE COMPLETE ANCHORING HANDBOOK “is foreseen to be launched soon, please have a look at:
http://www.amazon.com/Complete-Anchoring-Handbook-Alain-Poiraud/dp/0071475087