| 0: all non-imperviousness areas |
| 1: 1% imperviousness areas |
| 2: 2% imperviousness areas |
| 3: 3% imperviousness areas |
| 4: 4% imperviousness areas |
| 5: 5% imperviousness areas |
| 6: 6% imperviousness areas |
| 7: 7% imperviousness areas |
| 8: 8% imperviousness areas |
| 9: 9% imperviousness areas |
| 10: 10% imperviousness areas |
| 11: 11% imperviousness areas |
| 12: 12% imperviousness areas |
| 13: 13% imperviousness areas |
| 14: 14% imperviousness areas |
| 15: 15% imperviousness areas |
| 16: 16% imperviousness areas |
| 17: 17% imperviousness areas |
| 18: 18% imperviousness areas |
| 19: 19% imperviousness areas |
| 20: 20% imperviousness areas |
| 21: 21% imperviousness areas |
| 22: 22% imperviousness areas |
| 23: 23% imperviousness areas |
| 24: 24% imperviousness areas |
| 25: 25% imperviousness areas |
| 26: 26% imperviousness areas |
| 27: 27% imperviousness areas |
| 28: 28% imperviousness areas |
| 29: 29% imperviousness areas |
| 30: 30% imperviousness areas |
| 31: 31% imperviousness areas |
| 32: 32% imperviousness areas |
| 33: 33% imperviousness areas |
| 34: 34% imperviousness areas |
| 35: 35% imperviousness areas |
| 36: 36% imperviousness areas |
| 37: 37% imperviousness areas |
| 38: 38% imperviousness areas |
| 39: 39% imperviousness areas |
| 40: 40% imperviousness areas |
| 41: 41% imperviousness areas |
| 42: 42% imperviousness areas |
| 43: 43% imperviousness areas |
| 44: 44% imperviousness areas |
| 45: 45% imperviousness areas |
| 46: 46% imperviousness areas |
| 47: 47% imperviousness areas |
| 48: 48% imperviousness areas |
| 49: 49% imperviousness areas |
| 50: 50% imperviousness areas |
| 51: 51% imperviousness areas |
| 52: 52% imperviousness areas |
| 53: 53% imperviousness areas |
| 54: 54% imperviousness areas |
| 55: 55% imperviousness areas |
| 56: 56% imperviousness areas |
| 57: 57% imperviousness areas |
| 58: 58% imperviousness areas |
| 59: 59% imperviousness areas |
| 60: 60% imperviousness areas |
| 61: 61% imperviousness areas |
| 62: 62% imperviousness areas |
| 63: 63% imperviousness areas |
| 64: 64% imperviousness areas |
| 65: 65% imperviousness areas |
| 66: 66% imperviousness areas |
| 67: 67% imperviousness areas |
| 68: 68% imperviousness areas |
| 69: 69% imperviousness areas |
| 70: 70% imperviousness areas |
| 71: 71% imperviousness areas |
| 72: 72% imperviousness areas |
| 73: 73% imperviousness areas |
| 74: 74% imperviousness areas |
| 75: 75% imperviousness areas |
| 76: 76% imperviousness areas |
| 77: 77% imperviousness areas |
| 78: 78% imperviousness areas |
| 79: 79% imperviousness areas |
| 80: 80% imperviousness areas |
| 81: 81% imperviousness areas |
| 82: 82% imperviousness areas |
| 83: 83% imperviousness areas |
| 84: 84% imperviousness areas |
| 85: 85% imperviousness areas |
| 86: 86% imperviousness areas |
| 87: 87% imperviousness areas |
| 88: 88% imperviousness areas |
| 89: 89% imperviousness areas |
| 90: 90% imperviousness areas |
| 91: 91% imperviousness areas |
| 92: 92% imperviousness areas |
| 93: 93% imperviousness areas |
| 94: 94% imperviousness areas |
| 95: 95% imperviousness areas |
| 96: 96% imperviousness areas |
| 97: 97% imperviousness areas |
| 98: 98% imperviousness areas |
| 99: 99% imperviousness areas |
| 100: 100% imperviousness areas |
| 255: outside area |