This project begins to address this issue with the development of a protocol that considers specific criteria in a waterfront landscape that collectively appraise the potential risk of development to sensitive aquatic resources. A GIS-based model assesses and ranks criteria based on a designated set of rules and conditions. The model output classifies shoreline segments as low, moderate, or high potential for impact to aquatic health based on the cumulative scores.
Greenvale Creek in Lancaster County, Virginia was modeled to test the protocol.
6.0 scores a 3, 0.6-6.0 scores a 2, and <0.6 scores a 1.STABILITYSCORE holds the bank stability score which is based on the percent of stable shoreline (low erosion shoreline) within each analysis unit. If the amount of shoreline is <50% stable, then the score is 2, otherwise the score is 0. HEIGHTSCORE contains the scores for bank height. If >50% of shoreline within a unit is >10ft, or if >50% of the shoreline is <5ft, then the score is 2, otherwise the score is 0. EXPOSCORE contains the score for shoreline exposure. If the nearest land across the water is >2000m then the score is 2, otherwise the score is 0. FORESTSCORE contains the riparian forest score for water quality. If the percent of riparian forest is 0-33 the score = 2, 33.1-66 score = 1, 66.1-100 score = 0. TMISCORE holds the wetland score for water quality. If a wetland is present the score = 0; if a wetland is absent, the score = 2. SUM_WATERQ contains the summed scores for erodscore, permscore, stabilityscore, heightscore, exposcore, forestscore, and tmiscore. SUM_MOD_WATERQ hold the summed scores for sum_waterq and sum_modifiers. WATERQ_IMPACT and MOD_WATERQ_IMPAC hold the text ranking (low, moderate, high) of the previous two items. FINALSCORE holds the final ranking obtained by combining MOD_SHBITAT_IMP with MOD_WATERQ_IMPAC. Scores with be low, moderate, or high. ST_FED_LOC_OVERL is defined as state, federal, or locally owned lands. If this item contains a 'yes', then the analysis unit overlaps a publicly owned parcel.
GRNFINALCOV.PAT:
COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
1 AREA 4 12 F 3
5 PERIMETER 4 12 F 3
9 GRNFINALCOV# 4 5 B -
13 GRNFINALCOV-ID 4 5 B -
17 LABEL 4 5 B -
21 BUFFER 4 4 C -
25 LUSCORE 8 8 F 2
33 RTESCORE 8 8 F 2
41 SIGNIFSCORE 8 8 F 2
49 AQUASCORE 8 8 F 2
57 SEWERSCORE 8 8 F 2
65 SHLMODSCORE 8 8 F 2
73 SH_TMISCORE 8 8 F 2
81 SAVSCORE 8 8 F 2
89 REEFSCORE 8 8 F 2
97 SH_FORESTSCORE 8 8 F 2
105 SUM_MODIFIERS 8 8 F 2
113 SUM_SHABITAT 8 8 F 2
121 SUM_MOD_SHABITAT 8 8 F 2
129 MODIFIER_IMPACT 10 10 C -
139 SHABITAT_IMPACT 10 10 C -
149 MOD_SHABITAT_IMP 10 10 C -
159 ERODSCORE 8 8 F 2
167 PERMSCORE 8 8 F 2
175 STABILITYSCORE 8 8 F 2
183 HEIGHTSCORE 8 8 F 2
191 EXPOSCORE 8 8 F 2
199 FORESTSCORE 8 8 F 2
207 TMISCORE 8 8 F 2
215 SUM_WATERQ 8 8 F 2
223 SUM_MOD_WATERQ 8 8 F 2
231 WATERQ_IMPACT 10 10 C -
241 MOD_WATERQ_IMPAC 10 10 C -
251 FINALSCORE 16 16 C -
267 ST_FED_LOC_OVERL 4 4 C -
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