Chapter 1501:21-11 Investigations
The applicant shall be required to complete all investigations prior to submission of the final design report. The investigations shall include the items described in rules 1501:21-11-02 to 1501:21-11-05 of the Administrative Code. The scope and degree of precision that will be required for a specific project will be a matter of judgment based on the complexities of the site and the classification of the proposed structure.
The foundation investigation shall consist of borings, test pits, and other subsurface explorations as deemed necessary. These investigations shall be performed so as to define the soil and rock stratigraphy and the groundwater conditions to the satisfaction of the chief. Laboratory testing of the undisturbed and remolded soil specimens, and rock samples shall be required by the chief, unless the applicant can demonstrate to the satisfaction of the chief that these analyses are not necessary.
Where local and in-place materials, such as borrow soil, aggregate, riprap stone, and filter material, are proposed for use in the dam or levee, the applicant shall determine the locations and extents of these materials, and their structural properties and gradations when incorporated into the proposed dam or levee. The applicant shall show the locations of these materials on the plans.
Rescinded eff 1-16-05
(A) Hydraulic and hydrologic analyses shall be accomplished using methodologies and computer analyses developed by the division of soil and water resources, the United States army corps of engineers, the United States geological survey, the natural resources conservation service, the United States bureau of reclamation, the national weather service, or others which employ sound engineering basis and are specifically approved by the chief. Both present and projected future land uses shall be considered in determining the runoff characteristics of the drainage areas. The more severe of these two conditions shall be used in the design.
(B) For dams, the hydrologic and hydraulic assumptions and design calculations used in spillway designs shall be included in the design submittal. These shall include, but not be limited to:
(1) Rainfall and runoff data;
(2) Reservoir inflow hydrographs;
(3) Reservoir area-storage volume elevation data to the top of dam elevation;
(4) Spillway elevation-discharge data;
(5) Reservoir flood routings and backwater analyses, except as provided in rule 1501:21-13-03 of the Administrative Code; and
(6) A dam failure analysis as may be required by the chief for downstream hazard evaluation.
(C) For levees, the hydrologic and hydraulic assumptions and design calculations used shall be included in the design submittal. These shall include, but not be limited to:
(1) Discharge/probability data;
(3) Valley cross-sections;
(4) Descriptive hydraulic information concerning bridges and other structures that influence the hydraulic characteristics of the watercourse;
(5) Stream elevation-discharge-storage data; and
(6) Stream flood routings and flood profiles.
R.C. 119.032 review dates: 03/08/2010 and 05/15/2015
Promulgated Under: 119.03
Statutory Authority: 1521.06
Rule Amplifies: 1521.06, 1521.061
Prior Effective Dates: 4-15-72; 10-15-81; 12-9-99; 1-16-05