Questions 6 through 8 refer to the following. wants to evaluate the effectiveness of rain gardens in reducing the impact of urban n ruseff from an impervious roun parking lot and from the roof of the building. The parking lot is slightly flows foward the gardens The runoff from the roof is collected by various with and directed toward the gardens. Scientists at the agency plan to monitor the effectiveness by measuring ing the water quality of the storm water as ill moves through the gardens during and after storm 6 (1) Mark for Review Which of the following would be the best measure to use to determine the effectiveness of the ran gardens in reducing the impact of urban runoff? A The size and shape of the rain gardens (4) B The intensity and duration of the storm event C The speed and volume of the water exiting the gardens (c) D The temperature of the parking lot and the roof (D)