§ SR-14. Basic requirements.

A. 

General. The drainage plans shall be prepared in the following forms:

(1) 

Sheet size: 24 inches by 36 inches.

(2) 

Scales:

(a) 

Plan: one inch equals 100 feet. Note: Where required because of area, in addition to a one-hundred-foot-scale plan, a plan with a scale of one inch equals 200 feet will be required on Sheet 1, showing all applicable data under Subsection B.

(b) 

Profiles:

[1] 

Horizontal: one inch equals 40 feet.

[2] 

Vertical: one inch equals four feet.

(c) 

Alternate scales may not be used unless approved by the engineer.

(3) 

Title box: standard.

(4) 

Match lines: Where required, clearly defined match lines shall be properly drawn and designated.

(5) 

Materials: ink on linen.

B. 

The plan of the complete stormwater drainage system for the entire subdivision, with appropriate development stages for each final plat section, shall include the following:

(1) 

Storm sewers:

(a) 

Sizes.

(b) 

Gradients (%).

(c) 

Invert elevations and structures.

(2) 

Manholes:

(a) 

Numbered in accordance with design sheet.

(b) 

Type.

(3) 

Catch basin or inlet basin:

(a) 

Types.

(b) 

Boundaries of drainage areas contributing to each inlet and the area in acres.

(4) 

Surface drainage structures (e.g., valley gutters and warped intersections):

(a) 

Valley gutters shall be designated by the symbol "V.G." A separate detail may be required if grades are in excess of 3%.

(5) 

Concrete headwalls: All but standard concrete headwalls shall be detailed.

(6) 

Special structures; e.g., timber bulkhead, concrete sluices, overflow structures, culverts, etc.

(7) 

Detailed drawings required: stormwater, recharge basin (scale: one inch equals 40 feet), easements, streams, waterways, canals, etc.

C. 

Profiles. Profiles for all proposed streets in the subdivision and for all existing streets related to the development of the subdivision shall include the following:

(1) 

United States Coast and Geodetic Survey datum.

(2) 

All existing natural grades and proposed grades.

(3) 

Intersecting streets and stations.

(4) 

Vertical curve data. (Vertical curves are required where the algebraic difference of slopes is 1% or greater.)

(5) 

System of survey stations.

(6) 

Drainage pipes and structures.

(7) 

Sanitary sewers.

D. 

Design computations. The storm sewer system design computations shall be submitted with the final map submission on acceptable design sheets, signed by the engineer and dated.