Drainage is an integral part of any landscape project. Sometimes drainage needs to be retro fitted to alleviate drainage problems. Usually this is because the drainage was not considered when the landscaping was constructed. Whilst not ideal there are many options to consider when fitting drainage retrospectively.
Such options would consist of
-fitting of drainage pipes and pits.
-minor alterations to existing landscaping to direct/control water flow.
-installation of subsurface drainage.
-installation of waterproof membranes to inhibit water flow.
Of course the best solution for drainage is to consider the issues during construction and install the correct drainage solutions into the landscape project. Retaining walls, falls and land levels, installation of paved/hard surfaces, subsurface drainage, pipes and pits etc should all be considered when creating the best possible solution for the drainage of your landscape project.