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-2 Stage-Discharge Orifice Culvert / Orifices Cir Culvert Perforated Riser 1 (m) 2 (m) 3 Rise, in 18 4 6 Hole Diameter, in Span, in 18 9 16 No. holes No. Barrels 1 1 2 Invert Elevation, ft Invert Elevation, ft 533.50 537.40 538.30 Height, ft Orifice Coefficient, Co 0.60 0.60 0.60 Orifice Coefficient, Co Length, ft 36 Barrel Slope, % 1.5 N-Value, n 0.012 Weir Weirs Riser Ancillary 1 (m) 2 3 Shape

Ancillary 1 (m) 2 3 Shape / Type Rectangular Exfiltration, in/hr 1.50** Crest Elevation, ft 539.4 Crest Length, ft 2.5 Angle, deg Weir Coefficient, Cw 3.3 m = Flows through Culvert, i = Independent **Exfiltration extracted from outflow hydrograph. Rate applied to contours. Stage-Discharge 542 5 541 4 540 3 539 2 538 1 537 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 Discharge (cfs) Top of Pond 2-yr Pond Outflow