Table 2.

Median values of selected environmental variables for the state and by region. The minimum and maximum values are shown in parenthesis. For detailed variable descriptions, see Table 1 for variable codes: Area, AGURB21, Elevation, CondQrm, DamDensArea, IMPERVMEAN, MinesDens, and PPT, respectively

	Statewide (n = 1,386)	Lahontan (n = 200)	Central Valley (n = 54)	Coastal Chaparral (n = 216)	Modoc (n = 56)	Interior Chaparral (n = 75)	North Coast (n = 197)	South Coast (n = 385)	Sierras (n = 203)
Watershed area (km2)	43.2	89.1	103.9	320.6	468.4	112.8	28.7	48.8	39.8
	(0.12–40,509)	(1.1–2,307.1)	(5.8–31,185.2)	(1.79–8,722)	(1.81–8,812.4)	(2.94–575.9)	(1.1–40,509)	(0.12–4,118)	(1.2–4,565)
Watershed percent developed land (%)	2.03	0	30.13	5.45	0.46	2.06	2.16	5.75	0.06
	(0–100)	(0–45.27)	(0.34–100)	(0–80.78)	(0–41.98)	(0–63.73)	(0–83.93)	(0–100)	(0–34.38)
Elevation at sampling site (m)	638	2,037	28	102	1,361	379	535	459	1,433
	(0–3,107)	(1,258–3,107)	(3–141)	(0–1,269)	(0–2,205)	(66–940)	(3–1,753)	(0–2,246)	(512–2,997)
Percent canals or pipes at the 100 k scale (%)	0	0	9.28	0	0	0	0	0	0
	(0–68.65)	(0–17.24)	(0–68.65)	(0–47.39)	(0–17.99)	(0–54.64)	(0–19.02)	(0–60.89)	(0–54.31)
Predicted conductivity (μS/cm)	177	53	313	310	106	228	119	382	71
	(20–879)	(24–130)	(54–642)	(121–862)	(48–394)	(59–377)	(48–255)	(53–879)	(20–207)
Watershed dam density (number of dams/watershed area)	0	0	0	0	0	0	0	0	0
	(0–0.009)	0	(0–0.008)	(0–0.009)	(0–0.001)	0	(0–0.001)	(0–0.002)	(0–0.001)
Watershed impervious area (%)	0.150	0.104	1.700	0.167	0.092	0.179	0.050	0.367	0.112
	(0–57.55)	(0–11.10)	(0.07–51.81)	(0–32.93)	(0–12.89)	(0–18.56)	(0–32.96)	(0–57.55)	(0–10.17)
Watershed mine density (number of mines/watershed area)	0.018	0	0.042	0.024	0.004	0.049	0.015	0.026	0.009
	(0–10.25)	(0–0.62)	(0–1.69)	(0–1.38)	(0–1.50)	(0–2.48)	(0–0.75)	(0–0.99)	(0–10.25)
Annual precipitation (mm)	715	790	562	629	519	802	1,426	516	1,136
	(86–3,038)	(119–1,477)	(289–703)	(275–1,677)	(86–1,725)	(384–1,631)	(409–2,724)	(271–1,184)	(168–3,038)