Getting Caltrans to Approve Your Plans Basic Drainage Policies and Requirements

1. Getting Caltrans to Approve Your Plans Basic Drainage Policies and Requirements Roy H. King, MS,PE California Department of Transportation Division of Hydraulics

2. Getting Started • IGR (Inter-Governmental Review) – Optional but HIGHLY RECOMMENDED! • Environmental Processing and Approval • Research (Encroachment Permit Required for ALL WORK within Caltrans Right-of-Way!)

3. Plan and Permit Processing • Plan Submittal (PS & E Package, including Drainage Report) • Plan Review and Approval • Construction

4. Why Can’t I Do That? • Mandated / Restricted Use of Highway Funds and Right-of-Way • Longitudinal Encroachments

5. REMEMBER: • We Have High-Speed Traffic! (Affects ALL FACILITIES on our Highways!) • Affects DESIGN!

6. Caltrans Drainage Considerations • On-site Drainage • Off-site (Cross) Drainage • California Drainage Law • Existing / Future Storm Drain Systems • FEMA and Flood Plain Issues

7. On-Site Drainage • No more than 0.1 cubic foot per second during a 25-year frequency storm allowed as concentrated flow anywhere within the traveled way. • No water allowed to pond into the traveled way during a 25-year frequency storm.

8. Off-Site Drainage • No formal written policy for design of culverts. • Informal Policy: 100-year storm flow may not pond to the edge of traveled way; 10-year storm may not cause the culvert to seal or flow under pressure.

10. FEMA Issues • Is there a FIRM map for any of the watercourses near your project? • Will your proposed construction potentially raise the water surface by one foot or more? • Ifso, you will need to prepare a LOMR or CLOMR • - and: - • Even if there is no FIRM map, you still might have to prepare a LOMR or CLOMR!

12. FEMA Website: • http://msc.fema.gov/webapp/wcs/stores/servlet/FemaWelcomeView?storeId=10001&catalogId=10001&langId=-1

13. Recent Problem # 1 • Where water previously flowed well outside the traveled way, the installation of curb and gutter now forces this water into the highway.

14. Reduced carrying capacity as a result of the curb and gutter – will carry maybe 10-15 cfs before water flows into traveled way Existing ground probably capable of conveying 50-60 cfs before water reaches traveled way

15. But now—let’sput in some curb and gutter! Even in a minor storm, note how little runoff it takes to pond to edge of traveled way

16. Recent Problem # 2 • In the desert, our old two-lane rural roads would pond to a depth of four inches or so before water would flow across the road. Now that we’ve added two lanes and a shoulder, it ponds to a foot and a half!

17. Water ponds to only a few inches depth before spilling over centerline

18. Again, water ponds to only a few inches depth

19. But now, let’s add two twelve foot lanes (giving us three) at 2% crossfall, a ten foot shoulder at 5% crossfall, and look how deep the water ponds!

20. A More Serious Recent Problem: • New development, while retarding the 100-year storm to less than pre-development conditions, has increased the flow from small storms. The increased flow from these small storms is KILLING us!

21. The flood routing calculations showed this basin would work just fine!(Did the outlet plug?) Were the Contractor’s BMP’s functioning properly?

22. The basin was designed to reduce the 100-year Q from 250 cfs post-development down to 175 pre-development—and will work just fine in a 100-year storm! However, the 5-year post-development runoff of 85 cfs was NOT reduced to the pre-development 5-year runoff of 50 cfs!

23. So where did the extra concentrated runoff from the basin outlet go?

24. This is how it looked when it got to the next major highway junction…

25. After the storm…

26. Same location looking upstream…

27. Existing Problems you MAY be Asked to Help Solve • Malfunctioning drainage facilities • Non-existent facilities • Safety hazards (whether drainage-related or not)

28. Will your development increase the flow in this ditch? If so, you may be required to improve it…

29. Are you developing upstream? You’ll be asked to protect the culvert entrance…

30. Upstream or downstream, you’re probably going to have to do something here!

31. (Yes, we may ask you to help fix this, too, even though we did it…)

32. No comment!!!

33. Drainage Report Submittal Guidelines for District 8 Transportation Projects • Floodplain Analysis (if Applicable) • Preliminary Drainage Report • Final Drainage Report

35. Responsible Engineer Preparing Plans Caltrans Project Engineer Caltrans Project Engineer

36. Responsible Engineer Preparing Plans Professional Responsible for Environmental Document Caltrans Project Manager

37. To order by e-mail: http://caltrans-opac.ca.gov/publicat.htm

38. To Order by Mail or FAX: State of California Department of Transportation Publication Distribution Unit 1900 Royal Oaks Drive Sacramento California 95815 – 3800 FAX (916) 324-8997

39. Caltrans Drafting Standards

40. Caltrans Basic Traffic Control Requirements

41. Caltrans Basic Soil Compaction Requirements

42. Caltrans Water Quality Requirements

43. Caltrans Basic Landscaping Requirements

44. …and of course Caltrans Drainage Requirements…

45. Caltrans Plan Review & Encroachment Permit Process

47. Roy H. King, MS, PE Hydraulics Division, California Department of Transportation 464 West 4th, MS 1065 San Bernardino, CA 92401-1464 Tel. (909) 383-4555 E-mail: Roy_King@dot.ca.gov