2026 02 12 Crestmont CC and Eagle Rock Ave Stormwater Management Report

Pond Report File: Eagle Rock Proposed (Future).hys Hydrology Studio v 3.0.0.39 10-21-2025 SSBB-1 Stage-Discharge Orifice Culvert / Orifices Cir Culvert Perforated Riser 1 (m) 2 (m) 3 Rise, in 18 4 4 Hole Diameter, in Span, in 18 12 14 No. holes No. Barrels 1 1 1 Invert Elevation, ft Invert Elevation, ft 530.25 534.60 535.40 Height, ft Orifice Coefficient, Co 0.60 0.60 0.60 Orifice Coefficient, Co Length, ft 47 Barrel Slope, % 7.34 N-Value, n 0.013 Weir Weirs Riser Ancillary

Riser Ancillary 1 (m) 2 3 Shape / Type Rectangular Exfiltration, in/hr 1.50** Crest Elevation, ft 536.1 Crest Length, ft 3.5 Angle, deg Weir Coefficient, Cw 3.3 m = Flows through Culvert, i = Independent **Exfiltration extracted from outflow hydrograph. Rate applied to contours. Stage-Discharge 539 5 538 4 537 3 536 2 535 1 534 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Discharge (cfs) Top of Pond 2-yr Pond Outflow