Post-Fire Soil Water Repellency, Hydrologic Response, and Sediment Yield Compared between Grass-Converted and Chaparral Watersheds

Fire Ecology

Table 3 A comparison of site attributes and peak discharge between grass-converted and native chaparral watersheds.

Watershed	Area^a (ha)	Average slope (%)	Average slope length (m)	Total length channels^b (m)	Drainage density^c m m⁻²	Basin length^d (m)	Relative relief (m)
Chaparral	1.9	58	18	583	0.030	350	93
Grass	2.7	58	24	636	0.026	241	72
	Slope shape ^e			Peak discharge^f (m³ s⁻¹ ha⁻¹)
	Convex	Linear	Concave	2003	2004	2005	2006
Chaparral	42	47	11	0.37	0.10	0.43	<0.01
Grass	46	43	11	0.39	0.09	0.43	<0.01

^a Area from perimeter survey corrected to horizontal.
^b Total length of channels is the average sum of lengths of main stem and all tributaries.
^c Drainage density is the total length of channels divided by watershed area.
^d Basin length calculated from check dam to watershed divide along main stem.
^e Vertical and horizontal slope shapes. Convex includes: convex-convex, convex-linear, and linear-convex. Concave includes: concave-concave, concave-linear, and linear-concave. Linear includes: linear-linear.
^f Average cubic meters per second per hectare.