SAMPLE IMPERVIOUS SURFACE CALCULATION
San Mateo County
Planning and Building Department
SAMPLE IMPERVIOUS SURFACE CALCULATION
SAMPLE 10,000 SF LOT PROJECT
1 2
2,100 ft?
2
900 ft?
5 2
3 4
EXISTING PLAN (E)
PROPOSED PLAN
1 7,000 ft? (E) Pervious Area [e.g., landscaping, pervious pavers, green roofs] 2 3,000 ft? (E) Impervious Area [e.g., roofs, sidewalks, patios, paths, driveways, decks] 3 500 ft? (E) Impervious replaced by new Impervious 4 2,000 ft? (E) Pervious replaced by new Impervious 5 900 ft? (E) Impervious replaced by new Pervious
Existing Conditions (Pre-Project) A. Total Area of Parcel B. Existing Pervious Area C. Existing Impervious Area D. Existing % Impervious
IMPERVIOUS AREA SUMMARY
Proposed Changes E. Existing Impervious Area to be Retained F. Existing Impervious Area to be Replaced w/New Impervious Area G. Existing Pervious Area to be Replaced w/New Impervious Area H. New Impervious Area (Created and/or Replaced) I. Existing Impervious Area to Be Replaced w/New Pervious Area J. Net Change in Impervious Area
*Drainage from this area is required to be detained/retained on-site
Proposed Conditions (Post-Project) K. Proposed Pervious Area L. Proposed Impervious Area*
*Verify that K + L = A
M. Proposed % Impervious
? 100
+ - - + ? 100
A. 10,000 ft? B. 7,000 ft? C. 3,000 ft? D. 30 %
E. 1,600 ft2 F. 500 ft? G. 2,000 ft? H. 2,500 ft? I. 900 ft? J. 1,100 ft?
K. 5,900 ft? L. 4,100 ft?
M. 41 %
2-20-2019/v.1
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