“Stormwater Design Guidance – Solar Panel Installations
The primary purpose of Maryland’s stormwater management program is to mimic natural hydrologic runoff characteristics and minimize the impact of land development on water resources. Any land development project that exceeds 5,000 square feet of disturbance, including solar panel projects, must address stormwater management. However, for solar panels, stormwater management may be provided in a cost-effective manner by disconnecting each row of panels and directing runoff over the vegetated areas between the individual rows.
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read the entire memo
New York State Department of Environmental Conservation 5 April 2018