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

59 NRCS Runoff PR-2C-D Open Space D 2.298 12.10 6,369 ---- 60 NRCS Runoff PR-2C-D Impervious 1.533 12.10 5,075 ---- 61 Junction PR-2C-D 3.831 12.10 11,445 59, 60 63 NRCS Runoff PR-2C-U Open Space C 1.567 12.22 6,675 ---- 64 NRCS Runoff PR-2C-U Woods C 1.531 12.22 6,572 ---- 65 NRCS Runoff PR-2C-U Gravel C 0.383 12.10 1,126 ---- 66 NRCS Runoff PR-2C-U Impervious 2.537 12.10 8,400 ---- 67 Junction PR-2C-U 5.133 12.10 22,774 63, 64, 65, 66 70 Junction POA-2 10.31 12.10 70,401 46, 57, 61, 67

Hydrograph 25-yr Summary File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 Hyd. Hydrograph Hydrograph Peak Time to Hydrograph Inflow Maximum Maximum Flow Peak Volume Hyd(s) Elevation Storage No. Type Name (cfs) (hrs) (cuft) (ft) (cuft) 1 NRCS Runoff PR-1A-D Grass D 1.559 12.13 5,182 ---- 2 NRCS Runoff PR-1A-D Imp 2.116 12.10 7,058 ---- 3 Junction PR-1A-D 3.607 12.10 12,240 1, 2 5 NRCS Runoff PR-1A-U Open Space C 1.250 12.17 4,632 ---- 6 NRCS Runoff PR-1A-U Woods C 0.271 12.17 1,001 ---- 7 NRCS Runoff PR-1A-U Imp 3.306 12.10 11,028 ---- 8 Junction PR-1A-U 4.592 12.10 16,661 5, 6, 7 10 Junction PR-1A Total 8.199 12.10 28,901 3, 8 11 Pond Route PR-1A Routing 3.069 12.27 26,002 10 536.03 10,002 13 NRCS Runoff PR-1B-D 1.842 12.12 5,813 ---- 15 NRCS Runoff PR-1B-U Open Space C 0.986 12.20 3,999 ---- 16 NRCS Runoff PR-1B-U Woods C 1.881 12.20 7,623 ---- 17 NRCS Runoff PR-1B-U Impervious 7.010 12.12 27,067 ---- 18 Junction PR-1B-U 9.525 12.13 38,689 15, 16, 17 21 Junction PR-1B (Swale) 11.32 12.13 44,502 13, 18 24 NRCS Runoff PR-1C-D Open Space D 1.714 12.10 4,832 ---- 25 NRCS Runoff PR-1C-D Impervious 0.727 12.10 2,426 ---- 26 Junction PR-1C-D

-D Open Space D 1.714 12.10 4,832 ---- 25 NRCS Runoff PR-1C-D Impervious 0.727 12.10 2,426 ---- 26 Junction PR-1C-D 2.441 12.10 7,258 24, 25 28 NRCS Runoff PR-1C-U Open Space C 2.887 12.15 10,067 ---- 29 NRCS Runoff PR-1C-U Impervious 7.739 12.10 26,350 ---- 30 Junction PR-1C-U 10.33 12.10 36,417 28, 29 32 Junction POA-1 26.22 12.12 114,179 11, 21, 26, 30 35 NRCS Runoff PR-2A-D Open Space D 4.209 12.12 13,287 ---- 36 NRCS Runoff PR-2A-D Impervious 2.777 12.10 9,264 ----

Hydrograph 25-yr Summary File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 Hyd. Hydrograph Hydrograph Peak Time to Hydrograph Inflow Maximum Maximum Flow Peak Volume Hyd(s) Elevation Storage No. Type Name (cfs) (hrs) (cuft) (ft) (cuft) 37 Junction PR-2A-D 6.898 12.10 22,551 35, 36 39 NRCS Runoff PR-2A-U Open Space C 0.559 12.23 2,454 ---- 40 NRCS Runoff PR-2A-U Woods C 0.498 12.23 2,188 ---- 41 NRCS Runoff PR-2A-U Impervious 4.496 12.10 14,998 ---- 42 Junction PR-2A-U 5.236 12.10 19,640 39, 40, 41 45 Junction PR-2A 12.13 12.10 42,191 37, 42 46 Pond Route PR-2A Routing 4.531 12.25 38,803 45 538.80 16,329 48 NRCS Runoff PR-2B-D Open Space D 0.166 12.10 483 ---- 49 NRCS Runoff PR-2B-D Impervious 2.446 12.10 8,161 ---- 50 Junction PR-2B-D 2.612 12.10 8,644 48, 49 52 NRCS Runoff PR-2B-U Open Space C 0.047 12.10 129 ---- 53 NRCS Runoff PR-2B-U Impervious 0.198 12.10 662 ---- 54 Junction PR-2B-U 0.245 12.10 791 52, 53 56 Junction PR-2B 2.857 12.10 9,435 50, 54 57 Pond Route PR-2B Routing 0.283 12.92 9,422 56 554.56 4,100 59 NRCS Runoff PR-2C-D Open Space D 3.107 12.10 8,757 ---- 60 NRCS Runoff PR-2C-D Impervious 1.917 12.10 6,396 ---- 61

59 NRCS Runoff PR-2C-D Open Space D 3.107 12.10 8,757 ---- 60 NRCS Runoff PR-2C-D Impervious 1.917 12.10 6,396 ---- 61 Junction PR-2C-D 5.024 12.10 15,154 59, 60 63 NRCS Runoff PR-2C-U Open Space C 2.230 12.22 9,495 ---- 64 NRCS Runoff PR-2C-U Woods C 2.251 12.22 9,585 ---- 65 NRCS Runoff PR-2C-U Gravel C 0.494 12.10 1,480 ---- 66 NRCS Runoff PR-2C-U Impervious 3.174 12.10 10,587 ---- 67 Junction PR-2C-U 6.937 12.10 31,147 63, 64, 65, 66 70 Junction POA-2 15.04 12.10 94,525 46, 57, 61, 67

Hydrograph 100-yr Summary File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 Hyd. Hydrograph Hydrograph Peak Time to Hydrograph Inflow Maximum Maximum Flow Peak Volume Hyd(s) Elevation Storage No. Type Name (cfs) (hrs) (cuft) (ft) (cuft) 1 NRCS Runoff PR-1A-D Grass D 2.337 12.13 7,937 ---- 2 NRCS Runoff PR-1A-D Imp 2.913 12.10 9,800 ---- 3 Junction PR-1A-D 5.159 12.10 17,738 1, 2 5 NRCS Runoff PR-1A-U Open Space C 1.966 12.17 7,374 ---- 6 NRCS Runoff PR-1A-U Woods C 0.441 12.17 1,640 ---- 7 NRCS Runoff PR-1A-U Imp 4.551 12.10 15,313 ---- 8 Junction PR-1A-U 6.615 12.10 24,327 5, 6, 7 10 Junction PR-1A Total 11.77 12.10 42,065 3, 8 11 Pond Route PR-1A Routing 6.121 12.22 39,166 10 536.47 12,336 13 NRCS Runoff PR-1B-D 2.760 12.12 8,904 ---- 15 NRCS Runoff PR-1B-U Open Space C 1.552 12.20 6,367 ---- 16 NRCS Runoff PR-1B-U Woods C 3.068 12.20 12,484 ---- 17 NRCS Runoff PR-1B-U Impervious 9.653 12.12 37,585 ---- 18 Junction PR-1B-U 13.76 12.13 56,436 15, 16, 17 21 Junction PR-1B (Swale) 16.45 12.13 65,340 13, 18 24 NRCS Runoff PR-1C-D Open Space D 2.555 12.10 7,401 ---- 25 NRCS Runoff PR-1C-D Impervious 1.001 12.10 3,369 ---- 26 Junction PR-1C-D

-D Open Space D 2.555 12.10 7,401 ---- 25 NRCS Runoff PR-1C-D Impervious 1.001 12.10 3,369 ---- 26 Junction PR-1C-D 3.556 12.10 10,770 24, 25 28 NRCS Runoff PR-1C-U Open Space C 4.534 12.15 16,027 ---- 29 NRCS Runoff PR-1C-U Impervious 10.66 12.10 36,588 ---- 30 Junction PR-1C-U 14.77 12.10 52,616 28, 29 32 Junction POA-1 38.87 12.12 167,892 11, 21, 26, 30 35 NRCS Runoff PR-2A-D Open Space D 6.309 12.12 20,352 ---- 36 NRCS Runoff PR-2A-D Impervious 3.823 12.10 12,863 ----

Hydrograph 100-yr Summary File: Eagle Rock Proposed (Current).hys Hydrology Studio v 3.0.0.39 10-21-2025 Hyd. Hydrograph Hydrograph Peak Time to Hydrograph Inflow Maximum Maximum Flow Peak Volume Hyd(s) Elevation Storage No. Type Name (cfs) (hrs) (cuft) (ft) (cuft) 37 Junction PR-2A-D 10.02 12.10 33,216 35, 36 39 NRCS Runoff PR-2A-U Open Space C 0.881 12.23 3,907 ---- 40 NRCS Runoff PR-2A-U Woods C 0.814 12.23 3,583 ---- 41 NRCS Runoff PR-2A-U Impervious 6.190 12.10 20,826 ---- 42 Junction PR-2A-U 7.407 12.10 28,316 39, 40, 41 45 Junction PR-2A 17.42 12.10 61,532 37, 42 46 Pond Route PR-2A Routing 6.883 12.25 58,144 45 539.24 21,029 48 NRCS Runoff PR-2B-D Open Space D 0.248 12.10 740 ---- 49 NRCS Runoff PR-2B-D Impervious 3.368 12.10 11,332 ---- 50 Junction PR-2B-D 3.616 12.10 12,072 48, 49 52 NRCS Runoff PR-2B-U Open Space C 0.073 12.10 206 ---- 53 NRCS Runoff PR-2B-U Impervious 0.273 12.10 919 ---- 54 Junction PR-2B-U 0.346 12.10 1,125 52, 53 56 Junction PR-2B 3.962 12.10 13,197 50, 54 57 Pond Route PR-2B Routing 0.476 12.67 13,183 56 555.14 5,649 59 NRCS Runoff PR-2C-D Open Space D 4.630 12.10 13,414 ---- 60 NRCS Runoff PR-2C-D Impervious 2.640 12.10 8,882 ---- 61

59 NRCS Runoff PR-2C-D Open Space D 4.630 12.10 13,414 ---- 60 NRCS Runoff PR-2C-D Impervious 2.640 12.10 8,882 ---- 61 Junction PR-2C-D 7.270 12.10 22,296 59, 60 63 NRCS Runoff PR-2C-U Open Space C 3.514 12.22 15,116 ---- 64 NRCS Runoff PR-2C-U Woods C 3.677 12.22 15,698 ---- 65 NRCS Runoff PR-2C-U Gravel C 0.699 12.10 2,152 ---- 66 NRCS Runoff PR-2C-U Impervious 4.369 12.10 14,701 ---- 67 Junction PR-2C-U 10.44 12.10 47,667 63, 64, 65, 66 70 Junction POA-2 23.96 12.10 141,291 46, 57, 61, 67

FUTURE HYDROGRAPH CALCULATIONS