Reference guide v4 BD+C:Page290:

STEP 5:

I didnot understand why a 0.15 is used in this equation. Is this for any kind of losses in the rain water storage process. Cant we just use directly equation 3 to get adjusted LWR after equation 1?

Step 6:

0.15 in equation 4 is clear to account for 15% reduction by smart controls.