Montclair Stables Drainage Report 1 10 25

Post Construction Drainage Area C is reduced in size to 36,478 square feet from the existing area of 64,808 square feet. This reduction is due to the proposed outdoor riding arena construction (new Drainage Area F) and the connection of the easterly half of the indoor riding arena roof (new Drainage Area D.1) to Drainage Area D facilities. Drainage Area C will still contribute flow to the storm drain system as under present conditions. Post Construction Drainage Area D will be larger than Existing Drainage Area D due to the capturing of the roof runoff from the westerly half of the barn roof by the gutters and leader drain system. The new area will be 59,517 square feet. The proposed construction of the Nicholas Avenue driveway extension will not alter existing drainage patterns. Post Construction Drainage Area E will still drain toward Nicholas Avenue but will be significantly smaller at 4,649 square feet. This reduction is due to the new outdoor riding ring construction. Post Construction Drainage Area F includes the new outdoor riding arena and a small area between the proposed low retaining wall and the retaining curb. The surface area will be 35,605 square feet. As stated above, this drainage area will provide for a reduction in stormwater runoff and an increase in infiltration. CONCLUSION The designer believes that the proposal reduces stormwater runoff to adjacent properties and does not create increased demand on the public drainage system. ENCLOSURES Existing Drainage Areas Plan Proposed Conditions Drainage Areas Plan Page 3