2025 12 19 Stormwater Report Rev 1

0.027 360 0.150 0.260 0.512 0.140 0.242 0.485 -0.010 -0.018 -0.027 366 0.153 0.264 0.520 0.142 0.245 0.493 -0.011 -0.018 -0.027 372 0.156 0.269 0.532 0.146 0.251 0.505 -0.011 -0.019 -0.027 378 0.161 0.277 0.547 0.150 0.257 0.520 -0.011 -0.019 -0.027 384 0.166 0.284 0.564 0.155 0.265 0.536 -0.012 -0.020 -0.028 390 0.171 0.292 0.579 0.159 0.272 0.551 -0.012 -0.020 -0.028 396 0.176 0.300 0.596 0.164 0.279 0.567 -0.012 -0.021 -0.028 402 0.181 0.309 0.612 0.168 0.288 0.583 -0.013 -0.021 -0.029 408 0.186 0.318 0.629 0.173 0.296 0.600 -0.013 -0.021 -0.029 414 0.191 0.327 0.646 0.178 0.305 0.617 -0.013 -0.022 -0.029 420 0.196 0.336 0.663 0.183 0.314 0.633 -0.014 -0.022 -0.030 426 0.201 0.346 0.680 0.187 0.323 0.651 -0.014 -0.022 -0.030 432 0.207 0.355 0.698 0.192 0.332 0.668 -0.014 -0.023 -0.030 438 0.212 0.365 0.715 0.197 0.342 0.685 -0.015 -0.023 -0.030 444 0.217 0.374 0.733 0.202 0.351 0.702 -0.015 -0.023 -0.030 450 0.222 0.384 0.750 0.207 0.360 0.720 -0.015 -0.023 -0.031 456 0.227 0.393 0.767 0.212 0.369 0.737 -0.016 -0.024 -0.031 462 0.233 0.403 0.785 0.216 0.379 0.754 -0.016 -0.024 -0.031 468 0.238 0.413 0.803 0.221 0.389 0.772 -0.016 -0.024 -0.031 474 0.243 0.423 0.821 0.226 0.398 0.790 -0.017 -0.024 -0.031 480 0.248 0.432 0.839 0.231 0.408 0.807 -0.017 -0.025 -0.031 486 0.254 0.443 0.858 0.236 0.418 0.826 -0.018 -0.025 -0.031 492 0.259 0.453 0.875 0.241 0.428 0.844 -0.018 -0.025 -0.031 498 0.264 0.463 0.893 0.246 0.437 0.862

-0.018 -0.025 -0.031 492 0.259 0.453 0.875 0.241 0.428 0.844 -0.018 -0.025 -0.031 498 0.264 0.463 0.893 0.246 0.437 0.862 -0.018 -0.025 -0.031 2 of 24

Existing Conditions Proposed Conditions Difference Time 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year (Min) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) 504 0.269 0.473 0.911 0.251 0.447 0.880 -0.019 -0.025 -0.032 510 0.275 0.483 0.930 0.256 0.457 0.898 -0.019 -0.026 -0.032 516 0.280 0.493 0.948 0.261 0.467 0.916 -0.019 -0.026 -0.032 522 0.286 0.504 0.967 0.266 0.478 0.935 -0.020 -0.026 -0.032 528 0.292 0.514 0.986 0.272 0.488 0.954 -0.020 -0.026 -0.032 534 0.298 0.524 1.004 0.278 0.498 0.973 -0.020 -0.026 -0.032 540 0.305 0.535 1.023 0.284 0.508 0.991 -0.020 -0.026 -0.032 546 0.313 0.549 1.049 0.293 0.523 1.018 -0.021 -0.027 -0.032 552 0.327 0.572 1.091 0.306 0.545 1.059 -0.021 -0.027 -0.032 558 0.344 0.601 1.144 0.322 0.573 1.111 -0.022 -0.028 -0.033 564 0.362 0.632 1.203 0.340 0.603 1.169 -0.023 -0.029 -0.034 570 0.381 0.664 1.261 0.357 0.634 1.226 -0.024 -0.030 -0.035 576 0.400 0.696 1.321 0.376 0.665 1.285 -0.025 -0.031 -0.036 582 0.419 0.729 1.380 0.394 0.697 1.343 -0.025 -0.032 -0.037 588 0.439 0.761 1.440 0.413 0.729 1.403 -0.026 -0.033 -0.037 594 0.459 0.795 1.501 0.432 0.761 1.463 -0.027 -0.033 -0.038 600 0.479 0.828 1.562 0.451 0.794 1.523 -0.028 -0.034 -0.039 606 0.499 0.862 1.623 0.471 0.827 1.584 -0.028 -0.035 -0.039 612 0.520 0.896 1.684 0.490 0.860 1.645 -0.029 -0.035 -0.040 618 0.540 0.930 1.746 0.511 0.894 1.706 -0.030 -0.036 -0.040 624 0.561 0.965 1.809 0.531 0.928 1.769 -0.030 -0.037

0.040 618 0.540 0.930 1.746 0.511 0.894 1.706 -0.030 -0.036 -0.040 624 0.561 0.965 1.809 0.531 0.928 1.769 -0.030 -0.037 -0.040 630 0.582 1.000 1.872 0.552 0.963 1.831 -0.031 -0.037 -0.041 636 0.613 1.051 1.965 0.581 1.013 1.924 -0.032 -0.038 -0.042 642 0.664 1.136 2.120 0.630 1.096 2.077 -0.034 -0.040 -0.043 648 0.728 1.243 2.317 0.691 1.200 2.271 -0.036 -0.043 -0.046 654 0.799 1.363 2.536 0.760 1.317 2.487 -0.039 -0.046 -0.049 660 0.871 1.484 2.756 0.830 1.435 2.705 -0.042 -0.049 -0.051 666 0.955 1.624 3.010 0.911 1.572 2.956 -0.044 -0.052 -0.054 672 1.061 1.801 3.332 1.013 1.746 3.275 -0.048 -0.055 -0.057 678 1.183 2.004 3.699 1.131 1.945 3.638 -0.052 -0.059 -0.061 684 1.314 2.222 4.092 1.258 2.158 4.028 -0.056 -0.063 -0.064 690 1.447 2.442 4.488 1.388 2.375 4.421 -0.060 -0.067 -0.067 696 1.673 2.816 5.161 1.606 2.742 5.088 -0.066 -0.074 -0.073 702 1.990 3.342 6.110 1.915 3.260 6.029 -0.076 -0.083 -0.081 708 2.406 4.028 7.340 2.319 3.934 7.250 -0.087 -0.094 -0.090 714 3.156 5.268 9.562 3.049 5.154 9.455 -0.107 -0.114 -0.108 720 4.658 7.737 13.972 4.513 7.586 13.834 -0.144 -0.150 -0.138 726 7.702 12.713 22.808 7.493 12.501 22.619 -0.209 -0.212 -0.189 732 9.339 15.348 27.410 9.109 15.119 27.211 -0.230 -0.228 -0.199 738 7.484 12.260 21.824 7.314 12.093 21.681 -0.171 -0.167 -0.143 744 5.126 8.367 14.842 5.019 8.264 14.756 -0.107 -0.103 -0.086 750 3.158 5.135 9.076 3.098 5.079 9.030 -0.060 -0.056 -0.046 756 2.546 4.134 7.296 2.500 4.091 7.261

-0.107 -0.103 -0.086 750 3.158 5.135 9.076 3.098 5.079 9.030 -0.060 -0.056 -0.046 756 2.546 4.134 7.296 2.500 4.091 7.261 -0.046 -0.043 -0.035 3 of 24

Existing Conditions Proposed Conditions Difference Time 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year (Min) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) 762 2.104 3.412 6.015 2.067 3.378 5.988 -0.037 -0.034 -0.028 768 1.836 2.974 5.239 1.804 2.945 5.216 -0.031 -0.029 -0.023 774 1.631 2.641 4.649 1.604 2.616 4.629 -0.027 -0.025 -0.020 780 1.493 2.415 4.249 1.468 2.393 4.231 -0.025 -0.022 -0.018 786 1.354 2.189 3.848 1.332 2.169 3.832 -0.022 -0.020 -0.016 792 1.226 1.981 3.481 1.206 1.963 3.467 -0.019 -0.018 -0.014 798 1.122 1.812 3.184 1.104 1.796 3.171 -0.018 -0.016 -0.013 804 1.034 1.670 2.932 1.018 1.655 2.921 -0.016 -0.014 -0.011 810 0.954 1.540 2.704 0.940 1.527 2.693 -0.015 -0.013 -0.010 816 0.874 1.410 2.474 0.861 1.398 2.465 -0.013 -0.012 -0.009 822 0.805 1.298 2.278 0.793 1.288 2.269 -0.012 -0.011 -0.009 828 0.760 1.225 2.149 0.749 1.215 2.141 -0.011 -0.010 -0.008 834 0.730 1.177 2.065 0.720 1.168 2.057 -0.011 -0.010 -0.008 840 0.708 1.142 2.002 0.698 1.133 1.995 -0.010 -0.009 -0.007 846 0.687 1.107 1.940 0.677 1.098 1.933 -0.010 -0.009 -0.007 852 0.665 1.071 1.877 0.655 1.063 1.870 -0.010 -0.009 -0.007 858 0.643 1.036 1.815 0.634 1.028 1.809 -0.009 -0.008 -0.006 864 0.621 1.000 1.753 0.613 0.993 1.747 -0.009 -0.008 -0.006 870 0.599 0.965 1.690 0.591 0.957 1.684 -0.008 -0.008 -0.006 876 0.577 0.929 1.627 0.569 0.922 1.622 -0.008 -0.007 -0.006 882 0.555 0.893 1.564 0.548 0.887 1.559 -0.008 -0.007

0.006 876 0.577 0.929 1.627 0.569 0.922 1.622 -0.008 -0.007 -0.006 882 0.555 0.893 1.564 0.548 0.887 1.559 -0.008 -0.007 -0.005 888 0.533 0.858 1.502 0.526 0.852 1.497 -0.007 -0.007 -0.005 894 0.511 0.822 1.440 0.504 0.816 1.435 -0.007 -0.006 -0.005 900 0.489 0.786 1.376 0.482 0.781 1.372 -0.007 -0.006 -0.005 906 0.467 0.751 1.314 0.461 0.745 1.310 -0.006 -0.006 -0.004 912 0.448 0.720 1.260 0.442 0.715 1.256 -0.006 -0.005 -0.004 918 0.435 0.700 1.224 0.429 0.694 1.220 -0.006 -0.005 -0.004 924 0.427 0.686 1.201 0.421 0.681 1.197 -0.006 -0.005 -0.004 930 0.421 0.677 1.183 0.415 0.672 1.180 -0.006 -0.005 -0.004 936 0.415 0.666 1.165 0.409 0.661 1.161 -0.006 -0.005 -0.004 942 0.408 0.656 1.148 0.403 0.651 1.144 -0.005 -0.005 -0.004 948 0.402 0.646 1.130 0.397 0.642 1.127 -0.005 -0.005 -0.004 954 0.396 0.636 1.112 0.391 0.631 1.108 -0.005 -0.005 -0.004 960 0.390 0.626 1.094 0.385 0.621 1.091 -0.005 -0.004 -0.003 966 0.384 0.616 1.077 0.379 0.612 1.074 -0.005 -0.004 -0.003 972 0.378 0.606 1.060 0.373 0.602 1.057 -0.005 -0.004 -0.003 978 0.371 0.596 1.042 0.366 0.592 1.038 -0.005 -0.004 -0.003 984 0.365 0.586 1.024 0.360 0.582 1.021 -0.005 -0.004 -0.003 990 0.359 0.576 1.006 0.354 0.572 1.003 -0.005 -0.004 -0.003 996 0.352 0.566 0.988 0.348 0.562 0.985 -0.004 -0.004 -0.003 1002 0.346 0.556 0.971 0.342 0.552 0.968 -0.004 -0.004 -0.003 1008 0.340 0.546 0.954 0.336 0.542 0.951 -0.004 -0.004 -0.003 1014 0.334 0.536 0.936 0.330 0.532 0.933

-0.004 -0.004 -0.003 1008 0.340 0.546 0.954 0.336 0.542 0.951 -0.004 -0.004 -0.003 1014 0.334 0.536 0.936 0.330 0.532 0.933 -0.004 -0.004 -0.003 4 of 24

Existing Conditions Proposed Conditions Difference Time 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year 2-Year 10-Year 100-Year (Min) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) (CFS) 1020 0.328 0.526 0.918 0.324 0.522 0.916 -0.004 -0.004 -0.003 1026 0.321 0.516 0.900 0.317 0.512 0.898 -0.004 -0.004 -0.003 1032 0.315 0.505 0.883 0.311 0.502 0.880 -0.004 -0.003 -0.003 1038 0.309 0.495 0.865 0.305 0.492 0.862 -0.004 -0.003 -0.003 1044 0.302 0.485 0.847 0.299 0.482 0.844 -0.004 -0.003 -0.002 1050 0.296 0.475 0.829 0.292 0.472 0.826 -0.004 -0.003 -0.002 1056 0.290 0.465 0.811 0.286 0.461 0.809 -0.004 -0.003 -0.002 1062 0.283 0.454 0.793 0.280 0.451 0.791 -0.003 -0.003 -0.002 1068 0.277 0.445 0.776 0.274 0.442 0.774 -0.003 -0.003 -0.002 1074 0.271 0.435 0.759 0.268 0.432 0.757 -0.003 -0.003 -0.002 1080 0.265 0.425 0.741 0.262 0.422 0.739 -0.003 -0.003 -0.002 1086 0.259 0.415 0.723 0.255 0.412 0.721 -0.003 -0.003 -0.002 1092 0.253 0.406 0.708 0.250 0.403 0.706 -0.003 -0.003 -0.002 1098 0.250 0.400 0.698 0.247 0.397 0.696 -0.003 -0.003 -0.002 1104 0.247 0.397 0.692 0.244 0.394 0.690 -0.003 -0.003 -0.002 1110 0.246 0.394 0.687 0.243 0.391 0.685 -0.003 -0.003 -0.002 1116 0.244 0.391 0.682 0.241 0.389 0.680 -0.003 -0.003 -0.002 1122 0.243 0.389 0.678 0.240 0.386 0.676 -0.003 -0.003 -0.002 1128 0.241 0.386 0.674 0.238 0.384 0.672 -0.003 -0.003 -0.002 1134 0.240 0.384 0.670 0.237 0.382 0.668 -0.003 -0.002 -0.002 1140 0.238 0.381 0.665 0.235 0.379 0.663 -0.003 -0.002

0.002 1134 0.240 0.384 0.670 0.237 0.382 0.668 -0.003 -0.002 -0.002 1140 0.238 0.381 0.665 0.235 0.379 0.663 -0.003 -0.002 -0.002 1146 0.236 0.379 0.661 0.234 0.376 0.659 -0.003 -0.002 -0.002 1152 0.235 0.376 0.656 0.232 0.374 0.654 -0.003 -0.002 -0.002 1158 0.234 0.374 0.652 0.231 0.372 0.650 -0.003 -0.002 -0.002 1164 0.232 0.371 0.648 0.229 0.369 0.646 -0.003 -0.002 -0.002 1170 0.230 0.369 0.643 0.227 0.366 0.641 -0.003 -0.002 -0.002 1176 0.229 0.366 0.639 0.226 0.364 0.637 -0.003 -0.002 -0.002 1182 0.227 0.364 0.634 0.225 0.361 0.633 -0.003 -0.002 -0.002 1188 0.226 0.362 0.631 0.223 0.359 0.629 -0.003 -0.002 -0.002 1194 0.224 0.359 0.626 0.221 0.357 0.624 -0.003 -0.002 -0.002 1200 0.223 0.356 0.621 0.220 0.354 0.619 -0.003 -0.002 -0.002 1206 0.221 0.354 0.617 0.218 0.351 0.615 -0.003 -0.002 -0.002 1212 0.220 0.351 0.613 0.217 0.349 0.611 -0.003 -0.002 -0.002 1218 0.218 0.349 0.608 0.215 0.347 0.606 -0.003 -0.002 -0.002 1224 0.216 0.346 0.603 0.214 0.344 0.601 -0.002 -0.002 -0.002 1230 0.215 0.344 0.599 0.212 0.341 0.597 -0.002 -0.002 -0.002 1236 0.213 0.341 0.595 0.211 0.339 0.593 -0.002 -0.002 -0.002 1242 0.212 0.339 0.591 0.209 0.337 0.589 -0.002 -0.002 -0.002 1248 0.210 0.336 0.586 0.208 0.334 0.584 -0.002 -0.002 -0.002 1254 0.208 0.334 0.581 0.206 0.332 0.580 -0.002 -0.002 -0.002 1260 0.207 0.331 0.577 0.205 0.329 0.575 -0.002 -0.002 -0.002 1266 0.205 0.328 0.572 0.203 0.326 0.571 -0.002 -0.002 -0.002 1272 0.203 0.326 0.567 0.201 0.324 0.566