Guidelines for Street & Storm Drain Improvement Plans

Many municipalities and DOTs have a storm drain plan in effect, it is important that there is an improvement schedule in place to ensure codes and best practices are being observed. As you work on improving your drain plan, place a checkmark next to each of the following:

  • Dimensions and details are included in drawing when not city standard.
    • When standard is being followed, the standard drawing number is indicated.
    • Call out all proposed and existing utility crossings.
    • Confirm that existing information is shaded, proposed is solid, and future is dashed.
  • Elevations are included.
    • Typical sections for all streets (existing, proposed, and ultimate conditions).
    • Right and left sides of section as they would appear looking up-station on the street, even if only one side is being improved.
    • Identify property lines on elevations.
    • If difference in elevation between top of curb and existing ground exceed one foot, indicate slopes to be constructed.
    • Show traffic index under typical sections, check with Public Works Department.
    • Alley approaches, which drain a portion of an alley with a valley gutter, should be depressed at the rear end of the approach, indicated this on elevation plans.
  • Existing items in right-of-way noted with disposition they are encroaching:
    • Pipelines, irrigation lines, structures, power poles, trees, etc.
    • Existing underground structures that might conflict.
  • ADA compliance is called out as follows:
    • Curb return data is noted:
    • 35’ curb return radii at street intersections with secondary or major streets, others 27’.
    • Show curb return data (delta, tangent, radius and length).
    • Wheelchair ramps required at all curb returns except in knuckles.
    • On “T” intersections, handicapped ramp required.
  • The plans are approved by an engineer.
    • The engineer should posses a current city business license.
    • All required information is included on the plan for the city and respective engineer.
    • All appropriate notations for legibility are included.
    • North arrow and vicinity map.
    • Schedules and legends are called out (street signs and construction notes).
    • Drawing scale is indicated (illustrate both horizontal and vertical).
    • Radial bearings on centerline of all catch basins, etc., in a curve.
  • Private drainage systems are assessed as well.
    • Encroachment permits obtained when necessary.
    • Private drainage systems are labeled as such on the plans.
    • The private engineer is contacted for any proposed changes to existing conditions.
  • Plans are complete prior to proposed project date.
    • Not contingent on future or adjacent construction.
    • This is done after first check corrections have been made.
    • Letter to be written to Real Estate Department about any possible flooding of lots on tract, property that has natural water courses, etc.“10-day” letters are sent to adjacent property owners.

“Street and Storm Drain Improvement Plan Checklist.” Riverside, CA. Public Works Department, 08 Oct. 2008. Web. 30 July 2012. <>.

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