07/25/2007 Env Bd Packet - Laserfiche WebLink

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(c) Represent the "minimal impact" solution to a specific need with respect to all other altematives. (d) Allow for future erosion, scour, and sedimentation considerations. 4. REQUIRED EXHIBITS. The following exhibits must accompany the permit application. One set, full size (22 inches by 34 inches); two sets, reduced to maximum size of 11 inches by 17 inches. (a) Construction details showing: (1) Existing and proposed flow line (invert) elevations. (2) End details with flared end sections, wing walls and /or riprap (energy dissipaters). (3) Size and description of structure. (4) Emergency overflow elevation and route. (b) Construction schedule. (c) Narrative describing construction methods. (d) Erosion Control Plan. (e) Computations of watershed area, peak flow rates and elevations, and discussion of potential effects on water levels above and below the project area. 5. EXCEPTIONS. (a) Criteria 3(a) may be waived if the applicant can demonstrate with supporting hydrologic calculations: 1) the need for an increase in discharge rate in order to provide for reasonable surface water management in the upstream area, and 2) that the downstream impacts of the increased discharge rate can be reasonably accommodated and will not exceed the existing rate at the municipal boundary. RULE I DRAINAGE SYSTEMS 1. POLICY. It is the policy of the Board of Managers to regulate new construction, improvement or repair of public or private drainage systems (open and tiled) for the following purposes: (a) To preserve the capacities of drainage systems to accommodate future needs. (b) To improve water quality and prevent localized flooding. 2. REGULATION. No drainage system may be constructed, improved or repaired without first obtaining a permit from the District. The permit is in addition to any formal procedures or District approvals that may be required under Minnesota Statutes Chapter 103E or other ditch law. DRAFT DOCUMENT 24 • • •