Shoreline

Lake Huron's shoreline was analyzed using i-Tree Hydro to determine the impact of current vegetative and impervious surfaces on annual runoff quality and quantity. For more information on how each subbasin was simulated with i-Tree Hydro, refer to any subbasin page.

HUC	Tree Cover (%)	Impervious Cover(%)	Area (km2)	Annual Runoff (millions m3)	TSS Abated by Current Cover (kg)	Reduction in runoff with 100TC (%)	Reduction in runoff with 0IC (%)
04070001	45.44	72.48	457.05	143.77	6346.32	-9.18	-87.87
04070002	67.56	0.83	167.89	43.71	90.46	-8.74	-85.32
04070003	56.78	1.73	418.68	210.5	303.64	-10.65	-92.4
04070004	55.98	1.44	7.21	0.49	131.62	-3.1	-44.07
04070006	56.34	1.08	3.86	0.42	180.31	-4.78	-64.78
04070007	60.63	1.5	23.23	2.51	86.71	-5.78	-68.68
04080101	45.63	1.87	131.77	20.64	217.62	-7.37	-78.4
04080102	26.51	4.12	82.43	5.77	237.95	-4.46	-51.68
04080103	6.85	2.54	192.61	1128.44	274524.68	-7.33	3.11
04080104	13.94	2.0	203.67	16.9	1229.64	-4.46	-51.68
04080206	5.88	14.02	6.91	0.44	258.57	-3.49	-36.65

Table 2.1 Land use and annual runoff for each HUC8 in Lake Huron's basin

HUC	Total Suspended Solids	Total Phosphorus	Total Nitrogen
04070001	32.79	0.1073	1.59
04070002	11.61	0.0289	0.5
04070003	25.77	0.0429	1.11
04070004	28.08	0.0613	3.87
04070006	55.73	0.0626	1.13
04070007	21.0	0.0336	0.92
04080101	87.05	0.1084	1.81
04080102	232.29	0.2376	4.55
04080103	388.75	0.3517	5.9
04080104	409.95	0.3636	5.5
04080206	322.1	0.3111	7.88

Table 2.2 Localized pollutant coefficients (mg/L) for each HUC8 in Lake Huron's basin based on White et al. (2015) and annual precipitation.

Nutrient Loading

The i-Tree Buffer model is built upon the framework of Endreny and Wood (2003) and creates maps of watershed runoff likelihood and buffering likelihood values. This analysis used publicly available GIS inputs, annual rainfall data, and local (White et al., 2015) values for nonpoint source (NPS) loading of nutrients

For more information on how each subbasin was simulated with i-Tree Buffer, refer to any subbasin page.

HUC	Mean TP	TP Std. Deviation	90th Percentile TP	Max TP
04070001	0.559	1.721	1.0	21.0
04070002	0.126	0.462	0.0	11.0
04070003	0.121	0.391	1.0	5.0
04070004	0.183	0.53	1.0	7.0
04070006	0.266	0.628	1.0	7.0
04070007	0.172	0.587	1.0	12.0
04080101	0.689	1.304	3.0	12.0
04080102	0.78	0.771	2.0	5.0
04080103	0.567	0.524	1.0	4.0
04080104	0.907	0.587	2.0	5.0
04080206	0.364	0.483	1.0	2.0
04080202	0.779	0.923	2.0	8.0
04080201	0.787	1.339	3.0	10.0
04080203	0.919	0.962	2.0	8.0
04080204	0.871	1.048	2.0	10.0
04080205	0.784	0.845	2.0	7.0
04070005	0.209	0.609	1.0	6.0

Table 3.1 Total Phosphorus export coefficients (kg/ha/yr) by HUC8 in Lake Huron's basin.

HUC	Mean TN	TN Std. Deviation	90th Percentile TN	Max TN
04070001	11.245	31.816	16.0	378.0
04070002	3.924	13.741	8.0	246.0
04070003	6.315	15.658	20.0	186.0
04070004	6.1	16.863	22.0	228.0
04070006	7.167	16.892	25.0	200.0
04070007	6.643	20.746	26.0	332.0
04080101	14.315	26.675	50.0	289.0
04080102	20.477	18.49	44.0	127.0
04080103	16.313	8.218	25.0	105.0
04080104	19.046	11.608	32.0	122.0
04080206	18.432	7.022	25.0	59.0
04080202	17.091	18.401	40.0	173.0
04080201	16.521	26.576	55.0	228.0
04080203	20.357	20.477	45.0	198.0
04080204	21.074	24.6	52.0	274.0
04080205	18.799	18.743	41.0	173.0
04070005	6.504	18.819	21.0	203.0

Table 3.2 Total Nitrogen export coefficients (kg/ha/yr) by HUC8 in Lake Huron's basin.