Rain GardensDesign Review Check List

April 2015

Applicant: ______Date: ______

Submitted By: ______Project Location: ______

1)Drainage Area (DA)______SF

2)How much of the DA is Impervious Surface ______% and______SF (if soil quality restoration is done or if soils investigations indicate green space is capable of absorbing the WQv the green space can be eliminated from the DA for WQv calculation. If neither applies, assume ½ of the green space is equivalent to impervious surface.)

3)Discuss soils investigation findings (i.e. soil type, texture, structure, depth to water table, etc)______

______

4)Percolation rate______inches/hour

5)Ponding Depth ______inches

6)Factor used for sizing the rain garden ______(from page 8 of the RG Manual).

7)Surface Area of the Rain Garden ______SF

8)Describe any pretreatment techniques provided (what practice(s) were used, how were things sized, etc) ______

9)Does the Rain Garden have amended soil? ______Yes _____No

10)If yes, describe the type of amendments: (Soil blend specified in the Iowa Stormwater Management Manual is 75-90% washed concrete sand, 0-25% topsoil, 0-10% compost. Follow these recommendations rather than those in the Raingarden Design and Installation Manual).

  1. ______% sand (i.e. 5” of sand / 6” of amended soil = 0.83 or 83% sand)
  2. ______% topsoil (i.e. 1” of topsoil / 6” of amended soil = 0.17 or 17% topsoil)
  3. ______% compost(0.5“ of compost / 6” of amended soil = 0.083 or 8.3%

(So – a 5 inch layer of sand with a one inch layer of topsoil would be a desirable mix … 83% sand / 17% topsoil)

(Or – a 5 inch layer of sand with a ½ inch of topsoil and a ½ inch of compost would be a desireable mix … 83% sand / 8.3 % topsoil / 8.3% compost)

11)Quantities (please attach a copy of materials calculations):

  1. sand ______tons;
  2. compost ______tons or CY
  3. shredded hardwood mulch ______CF or ______CY

12)Describe overflow (i.e. stand pipe, notch in berm, etc.)______

______

13)Spacing of plants ______

14)Size of plants ______

15)Quantity of plants ______(Please attach a plant list and planting plan)

16)Depth of shredded hardwood mulch ______inches.

17)If supplemental seeding was done describe type and quantity of seed used and the rate that was applied (i.elbs/ac or per 1,000 SF) ______

______

18)Separation distance from nearest foundation ______. If less than 10 ft describe water proofing methods______

______

19)Please describe the Erosion and Sediment Control measures employed if the drainage area is not stabilized or the rain garden is not planted and stabilized immediately: ______

______

20)Please attach a map of the drainage area.

21)Please attach a plan view, profile and cross sectional drawing

FOR REVIEWERS USE ONLY

Design appears to comply with the standards in the Iowa Stormwater Management Manual.

Design does not appear to comply with the standards in the Iowa Stormwater Management Manual.

Comments: ______

______

______

______

Name of Reviewer: ______Date: ______

Signature: ______