Hello,
I had a meeting with the Raingarden consultant about installing a garden here and we've determined that the from yard is perfect as all the rainwater runs over the lawn straight into the storm drains. It looks like If I can build a Rain Garden of 5.3 square meters (57 sq ft), I can get a city Rebate enough to cover the cost of building the garden. Now I just need to convince my kids to dig a big trench for the bed. The Garden has to be 40 cm (15 inches) deep lined with compost and mulch leaving a 20cm (8-inch) depression. I have to reroute the downspout to feed into the Garden for water input. In this case, I think I'll build an arch over our walkway to support the downspout on its way to the lawn, the other choice is to lift part of the walkway and bury the spout to the garden. Lay down some rocks to protect the input area and output if there is too much water to be absorbed.

So IF the city wants to pay for me to build a new garden, who am I to argue.