§ 98-101. Soil infiltration rates.

For the purposes of this division, soil infiltration rates shall be as follows:

	Percent of Slope
Soil Texture, Type	0—4%	5—8%	8—12%	12—16%	Over 16%
	Infiltration Rate (IR) Inches/Hour
Coarse sand	1.25	1.00	0.75	0.50	0.31
Medium sand	1.06	0.85	0.64	0.42	0.27
Fine sand	0.94	0.75	0.56	0.38	0.24
Loamy sand	0.88	0.70	0.53	0.35	0.22
Sandy loam	0.75	0.60	0.45	0.30	0.19
Fine sandy loam	0.63	0.50	0.38	0.25	0.16
V. fine sandy loam	0.59	0.47	0.35	0.24	0.15
Loam	0.54	0.43	0.33	0.22	0.14
Silt loam	0.50	0.40	0.30	0.20	0.13
Silt	0.44	0.35	0.26	0.18	0.11
Sandy clay	0.31	0.25	0.19	0.12	0.08
Clay loam	0.25	0.20	0.15	0.10	0.06
Silty clay	0.19	0.15	0.11	0.08	0.05
Clay	0.13	0.10	0.08	0.05	0.03

 

Note: Rates based on full cover. These figures decrease with time and percent of cover. Derived from USDA information.

(Ord. No. 97-01, § 2(14.10.110), 1-2-1997; Ord. No. 97-13, § 2, 3-26-1997; Ord. No. 97-17, § 2, 9-24-1997)

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