2023 06 Drainage Statement

TABLE OF CONTENTS Page No. I. Introduction ............................................................................................... 3 II. Existing Drainage Conditions ..................................................................... 3 III. Proposed Drainage Conditions ................................................................... 4 IV. Runoff Rate Reduction Performance .......................................................... 4 V. Groundwater Recharge .............................................................................. 4 VI. Water Quality ............................................................................................ 4 VII. Conclusion ................................................................................................. 5 APPENDIX • Location Map • USGS Map • NRCS Web Soil Survey • Time of Concentration (Tc) Calculations • Runoff Curve Number (CN) Calculations – Existing • Runoff Curve Number (CN) Calculations – Proposed • Hydrograph Summary Reports – Existing and Proposed Conditions 2 yr. 10 yr. & 100 yr. • Multi-Hydrograph Plot – Existing and Proposed Conditions Superimposed 2 yr. 10 yr. & 100 yr. • Stormwater Collection System Calculations (Pipe Sizing) • Drainage & Inlet Area Maps MPB Realty, LLC October 2022 DEC# 1021-99-025 2 Last Revised June 2023