Shoreline

Lake Michigan'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 (%)
04030101	14.49	3.88	258.59	24.07	19872.39	-5.0	-60.98
04030102	27.47	2.28	471.94	123.07	14728.88	-8.83	-86.07
04030103	24.82	2.16	60.53	19.08	731.57	-9.42	-88.46
04030104	50.75	0.86	10.69	1.91	98.15	-7.57	-79.69
04030105	57.38	0.86	62.99	14.36	562.2	-8.44	-84.05
04030204	11.66	13.82	50.08	5.34	6154.46	-5.9	-70.81
04040003	20.12	13.84	88.95	6.38	11221.65	-4.22	-56.73
04040002	11.88	25.52	249.06	19.79	41384.3	-4.59	-60.92
04040001	21.16	14.68	202.25	30.96	30562.61	-7.36	-79.69
04050001	19.38	4.74	42.42	3.04	4109.93	-4.22	-56.73
04030109	64.67	0.79	152.22	39.69	548.24	-8.83	-86.07
04050002	32.01	6.75	166.01	38.68	8000.01	-9.08	-87.21
04050003	29.36	4.48	13.21	1.53	656.19	-6.35	-74.31
04050006	28.02	7.69	19.94	1.89	1470.86	-5.54	-68.67
04060101	54.58	2.24	260.61	69.64	1541.93	-8.81	-85.7
04060104	47.4	1.96	259.76	138.88	1037.0	-10.82	-92.85
04030108	66.91	0.86	4.91	0.47	41.8	-4.74	-62.15
04030110	65.78	0.81	8.81	0.98	42.91	-5.57	-67.49
04030111	67.39	1.32	99.01	19.9	228.12	-8.52	-84.5
04030112	65.47	0.58	290.69	82.42	125.12	-9.55	-89.0
04060102	49.15	2.3	15.93	1.46	361.85	-4.72	-58.28
04060103	60.14	1.11	16.28	2.7	11.96	-7.07	-76.93
04060105	49.97	2.84	157.78	77.64	1386.47	-10.58	-92.24
04060106	56.59	0.52	7.89	0.74	22.42	-4.55	-59.63
04060107	60.33	1.02	262.81	134.92	191.66	-10.71	-92.56

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

HUC	Total Suspended Solids	Total Phosphorus	Total Nitrogen
04030101	440.66	0.444	5.88
04030102	154.47	0.2261	3.97
04030103	173.82	0.1754	3.78
04030104	72.05	0.0782	2.68
04030105	57.46	0.0689	2.08
04030204	394.02	0.4041	6.59
04040003	260.64	0.3757	6.37
04040002	340.23	0.4968	7.78
04040001	327.09	0.3889	6.29
04050001	200.14	0.2308	4.85
04030109	17.83	0.1238	1.24
04050002	259.16	0.3518	5.43
04050003	197.32	0.2278	4.63
04050006	184.6	0.2324	4.5
04060101	84.06	0.0913	1.77
04060104	70.93	0.0962	1.77
04030108	16.01	0.0392	1.22
04030110	17.37	0.0631	0.62
04030111	13.4	0.0364	0.75
04030112	21.66	0.0343	0.72
04060102	94.49	0.102	1.84
04060103	34.28	0.0406	1.07
04060105	104.08	0.1184	1.82
04060106	5.39	0.0136	0.34
04060107	12.96	0.0469	0.68

Table 2.2 Localized pollutant coefficients (mg/L) for each HUC8 in Lake Michigan'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
04030101	1.02	0.83	2.0	8.0
04030102	0.646	1.304	2.0	22.0
04030103	0.277	0.506	1.0	3.0
04030104	0.277	0.671	1.0	8.0
04030105	0.328	0.735	1.0	8.0
04030204	0.986	0.642	2.0	5.0
04040003	0.976	1.002	2.0	7.0
04040002	1.622	1.44	3.0	16.0
04040001	1.822	2.0	5.0	17.0
04050001	0.309	0.485	1.0	9.0
04030109	0.611	1.552	3.0	18.0
04050002	1.317	1.738	4.0	15.0
04050003	0.704	0.839	2.0	8.0
04050006	0.732	0.876	2.0	9.0
04060101	0.349	0.695	1.0	7.0
04060104	0.482	1.129	2.0	10.0
04030108	0.183	0.706	0.0	19.0
04030110	0.152	0.581	0.0	7.0
04030111	0.185	0.561	1.0	5.0
04030112	0.344	1.045	1.0	9.0
04060102	0.545	0.992	2.0	10.0
04060103	0.113	0.469	0.0	10.0
04060105	0.694	1.422	3.0	13.0
04060106	0.131	0.544	0.0	8.0
04060107	0.253	1.158	0.0	19.0
04030201	1.012	1.258	3.0	10.0
04030202	0.59	0.924	2.0	12.0
04030203	1.25	0.859	2.0	4.0
04050004	0.357	0.504	1.0	5.0
04050005	1.001	0.794	2.0	6.0
04050007	0.885	0.948	2.0	8.0
04030107	0.122	0.69	0.0	10.0
04030106	0.265	1.166	0.0	14.0

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

HUC	Mean TN	TN Std. Deviation	90th Percentile TN	Max TN
04030101	19.243	14.119	36.0	201.0
04030102	18.477	30.635	39.0	553.0
04030103	13.451	14.036	28.0	109.0
04030104	9.988	20.612	31.0	249.0
04030105	9.546	20.604	35.0	257.0
04030204	23.723	15.731	45.0	123.0
04040003	22.357	21.639	51.0	175.0
04040002	33.962	24.323	55.0	211.0
04040001	34.148	33.014	75.0	240.0
04050001	14.417	12.448	30.0	128.0
04030109	7.439	17.272	35.0	205.0
04050002	23.744	24.084	55.0	183.0
04050003	18.401	20.335	46.0	201.0
04050006	18.873	20.299	42.0	227.0
04060101	10.176	20.171	34.0	223.0
04060104	11.467	24.536	43.0	274.0
04030108	6.25	22.094	13.0	559.0
04030110	5.922	18.755	7.0	240.0
04030111	6.064	16.055	21.0	151.0
04030112	8.863	23.023	42.0	203.0
04060102	12.969	22.338	46.0	233.0
04060103	5.443	16.613	13.0	302.0
04060105	13.166	24.352	52.0	225.0
04060106	5.248	18.908	3.0	278.0
04060107	4.855	19.825	4.0	313.0
04030201	17.975	21.032	46.0	244.0
04030202	13.55	20.125	39.0	343.0
04030203	23.191	14.467	41.0	118.0
04050004	13.868	13.887	33.0	120.0
04050005	20.501	14.093	37.0	119.0
04050007	19.101	18.92	42.0	161.0
04030107	4.574	21.51	1.0	297.0
04030106	6.393	26.66	1.0	311.0

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