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Low Impact Development's most powerful concepts are in the drainage planning of the entire site, at any scale.
*Reject dated ideas of concentrating all of the stormwater together in one corner.
*[[Modeling]]
*Argue against levelling every site into a generic, difficult to drain flatness.
When water is permitted to flow in a greater number of directions, each structural practice or BMP becomes much more efficient and cost effective.
Ideas for contemporary site planning strategies can be found in:
*[[Existing hydrology]]
*[[Natural drainage]]
[[Notation]]
LID BMPs are like a toolbox from which engineers can pick and choose depending on site constraints. But this has to come after a larger scale planning strategy to manage water and other ecosystem spaces.
==Selection of suite of LIDs: the Treatment Train Tool==
[[File:LIDTTT.png|thumb|LID Treatment Train Tool]]
In order to assess if the selected suite of BMPs effectively meet the design criteria, use either computer models or simple spreadsheet models. Base Mmdel selection on the size and type of development. A wide range of simple to complex computer models such as Visual OTTHYMO, SWMM, SWMMHYNO, HSP-F and QUALHYMO are available. See [[Modeling]].
STEP have developed the [http://www.sustainabletechnologies.ca/wp/low-impact-development-treatment-train-tool/ Low Impact Development Treatment Train Tool] to help developers, consultants, municipalities and landowners understand and implement sustainable stormwater management planning and design practices.
Mathematical [[notation]] used throughout the site.