4.7.2
At the location of each existing or predicted water quality and quantity problem identified in the Level 1 analysis, provide a rough quantitative analysis to define and evaluate proposed mitigation for the problem. Include the total composite drainage area tributary to that location for pre-development and post-development runoff conditions in the analysis. For this level of analysis, it is permissible to use non-survey field data (collected with hand tapes, hand level and rods, etc.) and approximate hydraulic computations.
The following steps shall be completed for this level of analysis:
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Develop solutions to drainage problems identified by the analysis. For any existing or predicted offsite drainage problem, the engineer shall demonstrate that the proposed plan has been designed so that it neither aggravates the existing problem nor creates a new problem. As an alternative, the applicant may arrange with the owners of the affected offsite properties to install measures, which will correct the existing or predicted problem, subject to all applicable permit requirements.
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Any proposed drainage easements shall be endorsed by the affected property owners and be recorded prior to approval of the proposed plan. In some cases, an existing drainage problem identified by the local government may be scheduled for solution. In these cases, the applicant should contact Kitsap County to check for potential cost sharing to solve the existing problem.
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For any predicted offsite problem, the engineer shall demonstrate that the proposed plan has been designed to mitigate the predicted problem. As an alternative, the applicant may arrange with the owners of offsite properties to install measures, which will mitigate the predicted problem. Any proposed drainage easements shall be endorsed by the affected property owners and be recorded prior to approval of the proposed plan.