MAIN FEATURE
wildflowers in a SuDS scheme in Chorley in Lancashire. Photo courtesy of Stormwater Shepherds UK.
method for dealing with water pollution risks, requiring the determination of pollution hazard indices for the area under consideration and thenmatching a SuDS device withmatchingmitigation indices.
In Table 26.2, themanual provides pollution hazard indices for a range of land uses and for three types of pollution: TSS,metals and hydrocarbons. So, for example, for a busy public car park such as a supermarket or hospital, the index for TSS is 0.7, formetals is 0.6 and for hydrocarbons 0.7.
The next step is to identify a formof SuDS treatment that can provide the necessarymitigation indices, either as a single treatment stage or using a combination of components. The manual has a table for that too, Table 26.3. However, this table only provides indices for natural SuDS components, stating that proprietary treatment
8 | June 2023 |
www.draintraderltd.com
Sampling is an outfall froma highway into a
river in Lancashire being sampled in September 2021 for the highway runoff box-out Photo courtesy of Stormwater Shepherds UK..
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80
