Finishing Up: Calculations and Budget

Calculations: 

Figure 1

Figure 1 shows pie charts detailing the effect the green roof on 30th Street Station would have on the amount of rainwater runoff the station generates. The baseline scenario is the roof in its current state and the "Current Scenario" would be with the green roof added. While the 9% change in runoff is relatively small when compared to other types of stormwater management systems, it should be noted that green roofs are not known for reducing runoff, but holding water. Using the area and the full saturation rate, it was determined that this green roof design could hold 180,840 lbs of water.

Budget: 

Category	Amount	Unit Cost	Total Cost
Rooflite Materials	748.59 ft3	$113	$84,750.00
Green Roof Solutions Roof Protection	508 ft2	$200	$400.00
Delivery	--	$860	$20,640.00
		TOTAL	$105,590.00

The table above shows the estimated costs of the materials that we chose from each company. These costs come directly from quotes that each company provided. In addition to this initial cost, there is an estimated annual maintenance cost of $1,000.