Since the ravine drains a basin above it, there is much more potential for erosion during a big storm, compared to the Edgewood Av construction site pictured below. The issue of planning for a big storm is what I want to discuss here.
The City and contractors would rather pay for the additional gravel or soil to fill in the gullies--after a big storm happens--than pay for more robust erosion control measures.
Since most of the damage to the lakes occurs during large storms, I believe this policy can't be defended--since surveys show citizens are unhappy with the City's care for the lakes.
It does seem a little wasteful to build elaborate erosion control measures, which just have to be dismantled when the construction is over. That's why I have advocated settling basins, rain gardens, and other watershed improvements, to be installed before a construction project begins. These erosion control measures will remain after construction is finished, to beautify the city and moderate future flooding.
You can read the full details of the erosion control plan, plus my critique, here.