From ed79f7c4867e0e669b0d754d7d2b3014e5c0121e Mon Sep 17 00:00:00 2001
From: scarapella <sean@carapella.net>
Date: Mon, 13 Oct 2025 19:17:08 -0400
Subject: [PATCH 1/2] In my experience, rapids usually occur on waterways that
 run downhill and/or have tidal effects.

---
 js/styleGenerator.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/js/styleGenerator.js b/js/styleGenerator.js
index d440ea1..45a6a9c 100644
--- a/js/styleGenerator.js
+++ b/js/styleGenerator.js
@@ -1089,6 +1089,21 @@ export function generateStyle(baseStyleJsonString, travelMode, lens) {
       case 'open_water':
         // only expect open_water tag on certain features
         return ["!", ["in", ["get", "waterway"], ["literal", ["fairway", "flowline"]]]];
+      case "rapids" : 
+        // only expect rapids tag on  
+        return ["all",
+          //  features that could have current    
+          ["!",["in", ["get", "waterway"], ["literal", [
+            "river",
+            "stream",
+            "canal",
+            "drain",
+            "ditch",
+            "canoe_pass"
+          ]]]],
+          // or tidal features
+          ["!=", ["get", "tidal"], "yes"]
+        ];
       case 'width':
         // don't expect width tag on links
         return ["==", ["get", "waterway"], "link"];

From f0d658442186f00f2989a5e3e1ec43633061275b Mon Sep 17 00:00:00 2001
From: scarapella <sean@carapella.net>
Date: Sun, 19 Oct 2025 18:15:51 -0400
Subject: [PATCH 2/2] narrowing the assumed rapids=no to only non-tidal
 flowlines

---
 js/styleGenerator.js | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/js/styleGenerator.js b/js/styleGenerator.js
index 45a6a9c..9616bed 100644
--- a/js/styleGenerator.js
+++ b/js/styleGenerator.js
@@ -1090,19 +1090,10 @@ export function generateStyle(baseStyleJsonString, travelMode, lens) {
         // only expect open_water tag on certain features
         return ["!", ["in", ["get", "waterway"], ["literal", ["fairway", "flowline"]]]];
       case "rapids" : 
-        // only expect rapids tag on  
+        // we assume non-tidal flowlines do not have rapids   
         return ["all",
-          //  features that could have current    
-          ["!",["in", ["get", "waterway"], ["literal", [
-            "river",
-            "stream",
-            "canal",
-            "drain",
-            "ditch",
-            "canoe_pass"
-          ]]]],
-          // or tidal features
-          ["!=", ["get", "tidal"], "yes"]
+          ["==", ["get", "waterway"], "flowline"],
+          ["==", ["get", "tidal"], "no"]
         ];
       case 'width':
         // don't expect width tag on links